WO2022209965A1 - 摺動部品 - Google Patents
摺動部品 Download PDFInfo
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- WO2022209965A1 WO2022209965A1 PCT/JP2022/012342 JP2022012342W WO2022209965A1 WO 2022209965 A1 WO2022209965 A1 WO 2022209965A1 JP 2022012342 W JP2022012342 W JP 2022012342W WO 2022209965 A1 WO2022209965 A1 WO 2022209965A1
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- WO
- WIPO (PCT)
- Prior art keywords
- thin film
- sliding
- sliding surface
- filler
- seal ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/043—Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/16—Sliding surface consisting mainly of graphite
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/74—Sealings of sliding-contact bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/162—Special parts or details relating to lubrication or cooling of the sealing itself
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2202/00—Solid materials defined by their properties
- F16C2202/02—Mechanical properties
- F16C2202/04—Hardness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
- F16C2206/02—Carbon based material
- F16C2206/04—Diamond like carbon [DLC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/48—Particle sizes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/60—Thickness, e.g. thickness of coatings
Definitions
- the present invention relates to a sliding part that slides relative to each other.
- the present invention relates to sliding parts used in bearings of machines or other machines in the field of bearings.
- the sliding part has a sliding surface that slides relative to the mating sliding surface, and constitutes a bearing that supports a rotating or reciprocating shaft, etc., and a shaft seal device that prevents leakage of the sealed fluid. used as parts.
- a shaft sealing device for preventing leakage of a sealed fluid for example, a mechanical seal has a pair of annular sliding parts that rotate relative to each other and slide on their sliding surfaces.
- the sliding part shown in Patent Document 1 is formed from carbon, which is a soft material, so that a low friction effect can be obtained by utilizing the self-lubricating property of carbon. If a foreign substance enters between them, the sliding surface of the sliding part made of carbon is likely to be scraped, resulting in a problem of resistance to foreign substances.
- the resistance to foreign matter can be improved by forming the sliding parts from SiC, which is a hard material (for example, Patent Document 2).
- SiC which is a hard material
- Patent Document 2 the sliding surface of the sliding part is coated with a diamond-like carbon coating (hereinafter sometimes referred to as a DLC coating). Due to the high hardness of the coating, there is a risk that galling may occur on the mating sliding surface depending on the conditions of use. In order to obtain the low-friction effect of the DLC coating, it was necessary to set complicated conditions such as changing the hydrogen content of the DLC coating according to the conditions of use, resulting in poor versatility.
- the present invention has been made with a focus on such problems, and an object thereof is to provide a sliding component capable of obtaining a stable low-friction effect under a wide range of usage conditions.
- the sliding component of the present invention is A sliding component having a sliding surface that slides relative to each other, A thin film mainly composed of graphite is directly coated on the base material of the sliding part, the sliding surface is made of the thin film, and the thin film contains a filler having a size equal to or less than the film thickness of the thin film. ing.
- the base material of the sliding part is coated with a thin film containing mainly graphite and filler, so that the thin film mainly composed of graphite forms the sliding surface by friction with the mating sliding surface.
- the thin film may contain a high-hardness filler harder than the graphite forming the thin film. According to this, since the thin film mainly composed of graphite contains the hard filler, the wear resistance and foreign matter resistance of the sliding surface can be improved.
- the hardness of the high-hardness filler may be lower than the hardness of the mating sliding surface. According to this, since the high-hardness filler is softer than the mating sliding surface, the mating sliding surface is less likely to be damaged by friction.
- the thin film may contain a low-friction filler having a lower coefficient of friction than the graphite forming the thin film. According to this, since the thin film mainly composed of graphite contains the low-friction filler, the lubricity of the sliding surface can be enhanced.
- FIG. 4 is an enlarged cross-sectional view showing the sliding surface of the rotary seal ring before use on which a thin film is formed in the example.
- FIG. 3 is a schematic cross-sectional view showing how fillers are dispersed in a thin film in an example.
- FIG. 4 is an enlarged cross-sectional view showing a state in which sheared chunks of graphite are generated due to sliding between the sliding surface of the rotary seal ring on which the thin film is formed and the sliding surface of the stationary seal ring in the example.
- FIG. 4 is an enlarged cross-sectional view showing a state after sliding between the sliding surface of the rotary seal ring on which the thin film is formed and the sliding surface of the stationary seal ring in the example.
- FIG. 1 A sliding component according to an embodiment will be described with reference to FIGS. 1 to 5.
- FIG. 1 a form in which the sliding part is a mechanical seal will be described as an example.
- the inner diameter side of the sliding part constituting the mechanical seal will be described as a low-pressure fluid side as a leakage side, and the outer diameter side as a high-pressure fluid side (sealed gas side) as a sealed fluid side.
- the mechanical seal for general industrial machinery shown in FIG. 1 tends to leak from the outer diameter side to the inner diameter side of the sliding surface in a non-lubricated environment where liquid does not intervene between the sliding surfaces, that is, in a dry environment. It is an inside type that seals the gas to be sealed.
- a mechanical seal is mainly composed of a rotary seal ring 20 as a sliding component and a stationary seal ring 10 as a sliding component.
- the rotary seal ring 20 has an annular shape and is provided on the rotary shaft 1 through the sleeve 2 so as to be rotatable together with the rotary shaft 1 .
- the stationary seal ring 10 has an annular shape and is provided in a non-rotatable and axially movable state on a seal cover 5 fixed to a housing 4 of a device to which it is attached.
- the stationary seal ring 10 is urged in the axial direction by the spring 6 so that the sliding surface 11 of the stationary seal ring 10 and the sliding surface 21 of the rotary seal ring 20 closely slide against each other.
- a gasket 7 seals between the rotary seal ring 20 and the sleeve 2
- an O-ring 8 seals between the stationary seal ring 10 and the seal cover 5 .
- the stationary seal ring 10 and the rotary seal ring 20 in this embodiment are made of SiC (silicon carbide).
- the stationary seal ring 10 and the rotary seal ring 20 are not limited to being made of the same material, and may be made of different materials.
- the rotary seal ring 20 is constructed by directly coating a thin film 30 on a SiC base material 22 as a base material. That is, the substantial sliding surface 21 of the rotary seal ring 20 is formed by the surface 30a of the thin film 30. As shown in FIG. In this embodiment, a thin film is not formed on the sliding surface 11 of the stationary seal ring 10 as the mating sliding surface (see FIG. 4).
- the thickness of the thin film 30 is thicker than the surface roughness of the SiC base material 22 as will be described later, and the entire surface of one end surface 22a of the SiC base material 22 in the axial direction is covered with the thin film 30.
- the sliding surface 21 is a part of the end surface portion 22a of the SiC substrate 22, for example, the top of the mountain on the surface may be exposed without being covered by the thin film 30 .
- the thin film 30 is directly coated on the SiC substrate 22, there is no need to form an intermediate layer, and there are no restrictions on the conditions of use for the intermediate layer, compared to the case where there is an intermediate layer.
- Thin in the thin film means thinner than the base material.
- the thin film 30 has a layered structure in which a skeleton structure of carbon atoms containing graphite as a main component is used as a base material. 41 are included.
- Graphite is mainly composed of carbon atoms, is a kind of carbon material and mainly has a hexagonal crystal structure, and is a substance that can be analyzed by Raman spectroscopic analysis or the like.
- the thin film 30 of the present embodiment is a thin film mainly composed of graphite, that is, a thin film exhibiting a composition in which the characteristics of the graphite component of the skeleton structure of carbon atoms on the surface remarkably appear.
- carbon atoms that mainly constitute graphite form a sheet-like crystal structure arranged in a hexagonal system by covalent bonds, and the thin sheet-like crystal structures are bonded in layers by van der Waals forces. This forms a graphite layer.
- Part of the carbon atoms in the skeleton structure may form a region composed of non-graphitized carbon.
- the thin film 30 is a SiC base material that constitutes the rotary seal ring 20 using a polyamic acid varnish, which is a precursor solution obtained by dissolving polyimide resin, which is a thermosetting resin, in an organic solvent, using a coating device such as a bar coater or a spin coater. 22 is directly coated so as to cover one end surface 22a in the axial direction, imidized by drying and curing, then cured by heating at a temperature of 1200° C. or higher in an inert atmosphere, and further baked. A graphitized skeleton is formed. That is, the skeleton structure of carbon atoms in the thin film 30 is derived from polyamic acid.
- a polyamic acid varnish which is a precursor solution obtained by dissolving polyimide resin, which is a thermosetting resin, in an organic solvent, using a coating device such as a bar coater or a spin coater. 22 is directly coated so as to cover one end surface 22a in the axial direction, imidized by drying and cu
- the thin film 30 By forming the thin film 30 to have a thickness within a predetermined range, it is possible to prevent the film from breaking and to graphitize the thermosetting resin by firing at a relatively low temperature. . Furthermore, the thin film 30 before initial use may be formed to have a thickness of 1 ⁇ m to 100 ⁇ m. If the film thickness is less than the above value, peeling will occur between the SiC substrate 22, and if the film thickness is greater than the above value, cracks will occur during film formation. Also, the film thickness of the thin film 30 is preferably set to an optimum value according to the particle size of the filler or additive dispersed in the film.
- the end surface portion 22a of the SiC base material 22 covered with the thin film 30 has an arithmetic mean roughness Ra of 0.1 ⁇ m or more on the surface thereof, and the thin film 30 is formed from the fine concave portions 22b of the end surface portion 22a of the SiC base material 22. A part of the thin film 30 is formed inside.
- the hardness measurement of the thin film 30 and the SiC base material 12 was tested using a nanoindenter, and it was confirmed that the SiC base material 12 showed a harder value than the thin film 30.
- the thin film 30 of this embodiment has a graphite region mainly formed on the surface by baking the polyimide resin, which is a thermosetting resin, at a temperature of 1200° C. or higher.
- the film composition of the thin film 30 can be determined by analyzing the film composition by, for example, XRD, Raman spectroscopic analysis, or thermal analysis.
- the thin film 30 is preferably formed by baking polyimide resin, which is a thermosetting resin, at a temperature of 1200°C or higher and lower than 2000°C.
- the thin film 30 granular high-hardness fillers 40 and low-friction fillers 41 having dimensions equal to or smaller than the film thickness of the thin film 30 are dispersed substantially uniformly in the film.
- the high-hardness filler 40 and the low-friction filler 41 are illustrated with the same particle size.
- the filler may also be a nanofiller.
- coke which is harder than the graphite forming the thin film 30 and softer than the SiC base material 12 forming the mating sliding surface
- fillers other than coke such as carbon black (C.B.), carbon fiber (C.F.), activated carbon, and graphite powder, may be used.
- the hardness measurement of the high-hardness filler 40 is performed by a nanoindenter, and a value that the high-hardness filler 40 is harder than the graphite constituting the thin film 30 and a value that the high-hardness filler 40 is softer than the SiC base material 12 are obtained. Confirmed what you showed.
- the thin film 30 is preferably adjusted so that the content of the high-hardness filler 40 in the film is 1 to 50% by weight.
- kaolin clay which has a smaller coefficient of friction than graphite forming the thin film 30, is used as the low-friction filler 41.
- the coefficient of friction between the thin film 30 and the low-friction filler 41 was measured using an AFM (atomic force microscope) to measure the frictional force. Confirmed what you showed.
- the thin film 30 of this embodiment by adding a high-hardness filler 40 as a main filler, the wear resistance of the thin film 30 mainly made of graphite is increased, and by adding a small amount of a low-friction filler 41, the thin film 30 is hardened.
- the friction coefficient of the surface can be reduced.
- kaolin clay as the low-friction filler 41, it is possible to reduce the coefficient of friction particularly in a dry environment.
- the total content of the filler contained in the thin film 30 is 75% by weight or less in order to exhibit the low-friction effect due to the self-lubricating property of graphite.
- the type, number, and content ratio of fillers contained in the film may be freely changed according to the properties required for the sliding surface 21.
- cerium oxide as a filler in addition to the high-hardness filler 40 and the low-friction filler 41 described above, silicate deposits caused by long-life coolant (LLC) can be removed.
- LLC long-life coolant
- CNT carbon nanotube
- natural graphite it is possible to impart electrical properties to the thin film.
- the degree of graphitization of the surface of the thin film 30 was analyzed using a spectroscopic analyzer manufactured by Nanophoton Co., Ltd., and measured at a center wavenumber of 2082.24 cm ⁇ 1 , an excitation wavelength of 532.36 nm, and a laser intensity of 0.8 mW.
- IG is the intensity of the G peak appearing at the center wavenumber of 1574 to 1576 cm ⁇ 1 .
- ID is the intensity of the D peak appearing at the center wavenumber of 1344 to 1348 cm ⁇ 1 . Multiple points in a specific region of the sample are measured, and the intensity ratio ID/IG is calculated from the G and D peak intensities of the averaged spectrum. If the value is 1 or less, it indicates graphite in the present invention.
- the stationary seal ring 10 is not formed with a thin film as described above, and at least the sliding surface 11 is formed of SiC.
- Table 1 shows the results of forming the thin film 30 of the rotary seal ring 20 (Samples F to M) and the test results of the Ring-on-Ring friction/wear test in this example.
- the applicability was determined based on whether or not seizure of the sliding surface occurred in a non-lubricated environment.
- the presence or absence of peeling of the thin film 30 from the sliding surface 21 of the rotary seal ring 20 and the presence or absence of cracks were confirmed.
- the confirmation of the presence or absence of peeling of the thin film air is blown against the sliding surface 21 of the rotary seal ring 20 to remove deposits.
- the thin film 30 of the rotary seal ring 20 which had no seizing of the sliding surface, no peeling of the thin film 30 from the sliding surface 21 of the rotary seal ring 20, and no cracks, had a thickness of 1 ⁇ m to 100 ⁇ m.
- Samples F, G, H, I, K were included in a non-lubricating environment.
- the rotary seal ring 20 on which the thin film 30 was formed in this example was produced by changing the content (% by weight) of the high-hardness filler 40 in the film, and under the following conditions, ring-on-ring friction/wear was performed.
- the results of the tests will be explained.
- the thin film 30 of the rotary seal ring 20 is formed with a uniform thickness of 20 ⁇ m.
- the thin film 30 is formed in a state in which the content of the low-friction filler 41 in the film is unified to 5% by weight.
- the stationary seal ring 10 is not formed with a thin film as described above, and at least the sliding surface 11 is formed of SiC.
- Table 2 shows the test results of the ring-on-ring friction/wear test of the rotary seal ring 20 (samples N to S) in this example.
- the applicability was determined based on whether or not seizure of the sliding surface occurred in a non-lubricated environment.
- the ring-on-ring friction/wear test as in Table 1, the presence or absence of cracks in the thin film 30 of the sliding surface 21 of the rotary seal ring 20 was confirmed.
- the thin film 30 of the rotary seal ring 20 which had no seizure on the sliding surface and no cracks, had a content of the high-hard filler 40 of 10% by weight or more, and the high-hard filler 40 and low friction It was found that the total content of filler 41 was 30% by weight or less (Samples O, P, Q, R).
- the stationary seal ring 10 which is a counterpart of the sliding surface 21 on which the thin film 30 is not formed, is made of carbon, which is a soft material
- foreign matter entering between the sliding surfaces 11 and 21 may cause the soft material to become soft.
- Foreign matter gets caught in the sliding surface 11 of the stationary seal ring 10, which is made of carbon, and the sliding surface 11 is scraped, resulting in surface roughness and loss of smoothness of the sliding surface, which adversely affects the coefficient of friction. give.
- the sliding surface of the sliding part made of carbon has a problem of foreign matter resistance.
- the rotary seal ring 20 is constructed by coating a hard SiC base material 22 with a thin film 30, and the mating stationary seal ring 10 is also made of SiC, which is a hard material. Therefore, when foreign matter enters between the sliding surfaces 11 and 21, the graphite region of the thin film 30 is preferentially scraped, and the SiC base material has an adverse effect on the friction coefficient of the sliding surface. Surface roughness of 12 and 22 is less likely to occur.
- the SiC base material 22 of the rotary seal ring 20 according to the present invention is directly coated with the thin film 30 mainly made of graphite and containing the high-hardness filler 40 and the low-friction filler 41.
- Friction with the sliding surface 11 shears the graphite-based thin film 30 that constitutes the sliding surface 21 between the graphite layers bonded by weak van der Waals force (see the enlarged portion in FIG. 4).
- the sliding surfaces 11 and 21 are pushed in the axial direction by the pressure contact force between them, and the thin film 30 partially enters and remains in the fine recesses 22b of the end surface portion 22a of the SiC base material 22, thereby smoothing the sliding surface 21. (see enlarged portion of FIG. 5).
- the thin film 30 remaining in the fine recesses 22b can exert the self-lubricating property of graphite on the sliding surface 11 of the stationary seal ring 10, so that the lubrication can be performed in a fluid lubrication region, a boundary lubrication region, and a non-lubrication environment. It is possible to stably obtain a low friction effect under a wide range of usage conditions such as.
- the sliding surface 21 of the rotary seal ring 20 covered with the thin film 30 is added with the function of the high-hardness filler 40 and the low-friction filler 41 having dimensions equal to or smaller than the film thickness of the thin film 30, and the film thickness is thin. Even if the thin film 30 is formed, the high-hardness filler 40 and the low-friction filler 41 are difficult to fall off, and in particular, the protrusion of the high-hardness filler 40 from the sliding surface 21 can be suppressed. hard to damage. It should be noted that the thin film 30 has a high ability to retain particles such as filler. In particular, it is possible to prevent the carbon-based filler from coming off even in a dry environment.
- the thin film 30 contains the high-hardness filler 40 harder than the graphite constituting the thin film 30, so that the wear resistance and foreign matter resistance of the sliding surface 21 composed of the thin film 30 mainly composed of graphite are improved. can be enhanced.
- the thin film 30 can form roughness on the sliding surface 21 by preferentially wearing the graphite region rather than the high-hardness filler 40 to form irregularities on the sliding surface 21 .
- the convex portion formed on the sliding surface 21 receives the load, especially during fluid lubrication, the fluid enters the concave portion to promote lubrication, thereby preventing noise due to sliding.
- the presence of sheared graphite lumps P30 derived from the thin film 30 in the fluid can improve lubricity.
- the high-hardness filler 40 is softer than the sliding surface 11 of the stationary seal ring 10, the mating sliding surface 11 is less likely to be damaged by friction.
- the thin film 30 can increase the lubricity of the sliding surface 21 by including the low-friction filler 41 having a smaller coefficient of friction than the graphite forming the thin film 30 .
- the thin film 30 is formed only on the sliding surface 21 of the rotary seal ring 20, sheared lumps P30 of graphite originating from the thin film 30 and generated between the sliding surfaces 11 and 21 (see the enlarged portion of FIG. 4). is pushed in the axial direction by the pressure contact force between the sliding surfaces 11 and 21, and enters and transfers into the minute recesses 12b of the end surface portion 12a of the SiC base material 12 that constitutes the sliding surface 11 of the stationary seal ring 10.
- the transfer film 31 the sliding surface 11 of the stationary seal ring 10 is also smoothed (see the enlarged portion of FIG. 5). As a result, between the sliding surfaces 11 and 21, the ratio of the sliding portion between SiC and graphite or between graphite is increased, so that a better low friction effect can be obtained.
- the thin film 30 is formed by directly applying polyamic acid varnish, which is a precursor solution obtained by dissolving a polyimide resin, which is a thermosetting resin, in an organic solvent to the end surface portion 22a of the SiC substrate 22, and baking the varnish. Therefore, the adhesion of the thin film 30 to the SiC base material 22 is high by entering into the minute recesses 22b of the end surface portion 22a of the SiC base material 22 .
- the viscosity of the polyamic acid varnish which is a precursor solution of polyimide resin with excellent film-forming properties, to an arbitrary viscosity and applying it to form a film, it is possible to suitably shrink in the surface direction and thickness direction and improve adhesion. can be done. Therefore, the film formation area of the thin film 30 is not limited.
- Graphite is usually produced at a very high temperature of about 3000° C., but the thin film 30 of the present invention can be produced by applying a thin layer of polyamic acid varnish and baking it at a relatively low temperature of 1200° C. or more and 2000° C. or less.
- the thin film 30 is less likely to peel off or break due to shrinkage due to heat.
- the thin film 30 is formed as thin as 1 ⁇ m to 100 ⁇ m in thickness, and contains a filler having a size equal to or less than the film thickness of the thin film 30, so that the gas generated inside the thin film 30 during firing can easily escape. , the occurrence of cracks can be prevented.
- the hardness of the thin film 30 is smaller than the hardness of the sliding surface 11 of the stationary seal ring 10, that is, the hardness of the SiC base material 12, the thin film 30 is softer than the sliding surface 11 of the stationary seal ring 10, and friction causes friction. The sliding surface 11 of the stationary seal ring 10 is hardly damaged. Furthermore, since the hardness of the thin film 30 is lower than the hardness of the SiC base material 22 of the rotary seal ring 20, when foreign matter enters between the sliding surfaces 11 and 21, the graphite region of the soft thin film 30 preferentially The shearing promotes the smoothing of the sliding surface 21, and the exposed end face portion 22a of the hard SiC base material 22 and the high-hard filler 40 can enhance foreign matter resistance. In between, both the self-lubricating property of graphite and the foreign matter resistance can be achieved.
- the base material of the rotary seal ring 20 is made of SiC, which is a ceramic, and since the SiC base material 22 is porous, there are many fine recesses 22b into which a part of the thin film 30 enters the end surface portion 22a. , the thin film 30 is easily fixed to the surface of the base material because the surface roughness is more likely to occur than that of metal. Furthermore, since the end face portion 22a of the SiC substrate 22 on which the thin film 30 is formed has an arithmetic mean roughness Ra of 0.1 ⁇ m or more, the thin film 30 is partially formed in the minute recesses 22b of the end face portion 22a. Therefore, even if the graphite region of the thin film 30 is sheared by friction with the sliding surface 11 of the stationary seal ring 10, a part of the thin film 30 is held in the fine recesses 22b, It is hard to fall out of 21 rooms.
- the entire surface of the end surface portion 22a of the SiC substrate 22 is covered with the thin film 30. In other words, the surface of the substrate is not exposed. Since the graphite region of the thin film 30 is sheared, the sliding surface 21 is likely to be smoothed.
- the thickness of the thin film 30 is 1 ⁇ m to 100 ⁇ m, it is possible to prevent the thin film 30 from peeling off from the end face portion 22a of the SiC substrate 22 and the thin film 30 from cracking. can be used as a film of
- the thickness of the thin film 30 is greater than the arithmetic mean roughness Ra of the surface of the end face portion 22a of the SiC substrate 22, that is, the thickness of the thin film 30 is greater than the unevenness of the surface of the end face portion 22a of the SiC substrate 22. Since the thin film 30 is large, part of the thin film 30 is likely to enter the fine recesses 22b of the SiC substrate 22, and friction with the sliding surface 11 of the stationary seal ring 10 reliably shears the graphite region of the thin film 30. A part of the thin film 30 tends to remain in 22b, and the low-friction effect tends to be exhibited.
- the base material of the rotary seal ring 20 and the sliding surface can be made of different materials, the thin film 30 of the sliding surface 21 can be formed while the base material has the rigidity and high thermal conductivity of ceramics such as SiC. It is possible to impart the self-lubricating properties of graphite and the functions of various fillers. Furthermore, by changing the base material to an inexpensive material, the cost of the sliding parts can be reduced.
- the thin film 30 is mainly made of graphite, it has excellent chemical resistance and oxidation resistance.
- the oxidation resistance of the thin film 30 is at the same level as the highly crystalline artificial graphite for electrodes, indicating that high crystallinity can be obtained at a relatively low temperature.
- mechanical seals for general industrial machinery were used as sliding parts, but other mechanical seals for automobiles, water pumps, etc. may also be used.
- it is not limited to mechanical seals, and sliding parts other than mechanical seals, such as slide bearings, may be used.
- the thin film 30 can be formed on the inner peripheral surface of the bearing, it can also be applied to sliding parts constituting radial bearings and the like.
- the mechanical seal to which the sliding parts are applied has been described as being used in an unlubricated environment. It may also be used in a smooth hydrodynamic lubrication zone or a boundary lubrication zone.
- the thin film 30 is provided only on the rotary seal ring 20.
- the thin film 30 may be provided only on the stationary seal ring 10, or may be provided on both the rotary seal ring 20 and the stationary seal ring 10. may
- the thin film 30 was described as being derived from polyamic acid, which is a precursor solution obtained by dissolving polyimide resin in an organic solvent.
- polyamic acid which is a precursor solution obtained by dissolving polyimide resin in an organic solvent.
- urea resin, epoxy resin, unsaturated polyester resin, silicone resin, diallyl phthalate resin, polyimide resin, polyurethane resin, etc. may be derived from the precursor solution.
- the filler is not limited to be granular, and may be, for example, fibrous.
- the thin film 30 may not contain the low-friction filler 41 as long as the sliding surface 21 can be sufficiently lubricated by the self-lubricating property of graphite.
- the thin film 30 is fired in a nitrogen atmosphere for 30 minutes at a firing temperature of 1200° C. or more and less than 2000° C., thereby changing the degree of graphitization.
- the degree of graphitization may be changed by setting the firing temperature to the same temperature in the range of 1200° C. or higher and less than 2000° C. and changing the firing time.
- the end surface portion 22a of the SiC substrate 22 covered with the thin film 30 may have an arithmetic mean roughness Ra of 0.1 ⁇ m or less depending on the thickness of the thin film 30 .
- the stationary seal ring 10 and the rotary seal ring 20 are made of SiC. applicable if available.
- SiC include sintered bodies using boron, aluminum, carbon, etc. as sintering aids, and materials composed of two or more phases with different components and compositions, such as SiC and SiC in which graphite particles are dispersed. Reaction sintered SiC or the like made of Si may be used.
- ceramics such as alumina, zirconia, silicon nitride (Si3N4), metal materials, resin materials, composite materials, and the like are also applicable.
- the base material of the sliding part when the base material of the sliding part is partially stabilized zirconia, the base material itself has excellent toughness but poor thermal conductivity. Because of its excellent properties, frictional heat generated by relative sliding with the mating sliding surface can be dissipated in the surface direction, and temperature rise of the sliding surface can be suppressed.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
Description
相対摺動する摺動面を有する摺動部品であって、
前記摺動部品の基材には黒鉛を主とする薄膜が直接被膜されており、前記摺動面は前記薄膜からなり、前記薄膜には、当該薄膜の膜厚以下の寸法のフィラーが含まれている。
これによれば、摺動部品の基材が黒鉛を主としフィラーが含まれる薄膜で被膜されることにより、相手側の摺動面との摩擦によって摺動面を構成する黒鉛を主とする薄膜がファンデルワールス力で結合している黒鉛層の層間でせん断され、基材表面の微細凹部内に薄膜の一部が残ることで摺動面が平滑化されるとともに、相手側の摺動面に対して黒鉛の自己潤滑性を発揮することができるため、流体潤滑域、境界潤滑域、無潤滑環境下等の広い使用条件において安定して低摩擦効果を得ることができる。加えて、摺動面はフィラーによる機能が付加されるとともに、膜厚の薄い薄膜であってもフィラーが脱落し難く、フィラーが摺動面から突出することも抑制できるため、摩擦により相手側の摺動面を傷つけ難い。
これによれば、黒鉛を主とする薄膜が高硬質フィラーを含むことにより、摺動面の耐摩耗性や耐異物性を高めることができる。
これによれば、高硬質フィラーが相手側の摺動面よりも軟質であるため、摩擦により相手側の摺動面を傷つけ難い。
これによれば、黒鉛を主とする薄膜が低摩擦フィラーを含むことにより摺動面の潤滑性を高めることができる。
静止密封環の摺動面の面圧=0.25MPa
回転密封環の回転数=74rpm
PV値=0.008MPa.m/sec
試験時間=摺動距離1000mに達するまで
被密封流体=大気
静止密封環の摺動面の面圧=0.25MPa
回転密封環の回転数=74rpm
PV値=0.008MPa.m/sec
試験時間=摺動距離1000mに達するまで
被密封流体=大気
11 摺動面
12 SiC基材(基材)
12a 端面部
12b 微細凹部
20 回転密封環(摺動部品)
21 摺動面
22 SiC基材(基材)
22a 端面部
22b 微細凹部
30 薄膜
30a 表面
31 移着膜
40 高硬質フィラー(フィラー)
41 低摩擦フィラー(フィラー)
P30 せん断塊
Claims (4)
- 相対摺動する摺動面を有する摺動部品であって、
前記摺動部品の基材には黒鉛を主とする薄膜が直接被膜されており、前記摺動面は前記薄膜からなり、前記薄膜には、当該薄膜の膜厚以下の寸法のフィラーが含まれている摺動部品。 - 前記薄膜は、当該薄膜を構成する前記黒鉛よりも硬質な高硬質フィラーを含んでいる請求項1に記載の摺動部品。
- 前記高硬質フィラーの硬度は、相手側の摺動面の硬度よりも小さい請求項2に記載の摺動部品。
- 前記薄膜は、当該薄膜を構成する前記黒鉛よりも摩擦係数が小さい低摩擦フィラーを含んでいる請求項1ないし3のいずれかに記載の摺動部品。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202280023959.XA CN117043496A (zh) | 2021-03-30 | 2022-03-17 | 滑动部件 |
| JP2023510942A JP7661481B2 (ja) | 2021-03-30 | 2022-03-17 | 摺動部品 |
| US18/284,281 US20240167509A1 (en) | 2021-03-30 | 2022-03-17 | Sliding component |
| EP22780184.2A EP4317729A4 (en) | 2021-03-30 | 2022-03-17 | SLIDING COMPONENT |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021057271 | 2021-03-30 | ||
| JP2021-057271 | 2021-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022209965A1 true WO2022209965A1 (ja) | 2022-10-06 |
Family
ID=83459124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2022/012342 Ceased WO2022209965A1 (ja) | 2021-03-30 | 2022-03-17 | 摺動部品 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240167509A1 (ja) |
| EP (1) | EP4317729A4 (ja) |
| JP (1) | JP7661481B2 (ja) |
| CN (1) | CN117043496A (ja) |
| WO (1) | WO2022209965A1 (ja) |
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| JP2004225725A (ja) | 2003-01-20 | 2004-08-12 | Eagle Ind Co Ltd | 摺動部品 |
| JP2008128220A (ja) * | 2006-11-24 | 2008-06-05 | Hitachi Appliances Inc | 冷凍装置 |
| JP2009091661A (ja) * | 2008-11-14 | 2009-04-30 | Totan Kako Kk | 複合材料、複合材料の製造方法及び該複合材料を用いた摺動部材 |
| JP2011058517A (ja) | 2009-09-07 | 2011-03-24 | Nippon Pillar Packing Co Ltd | ドライコンタクトメカニカルシール |
| JP2019015309A (ja) * | 2017-07-04 | 2019-01-31 | イーグル工業株式会社 | メカニカルシール |
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|---|---|---|---|---|
| USRE24651E (en) * | 1959-05-19 | Resilient toroidal push-type pipe joint | ||
| FR1450389A (fr) * | 1963-09-24 | 1966-06-24 | Specialties Dev Corp | Surface de palier lubrifié résistant aux températures élevées et son procédé de fabrication |
| JP4094176B2 (ja) * | 1999-07-13 | 2008-06-04 | イーグル工業株式会社 | メカニカルシール |
| JP2006057138A (ja) * | 2004-08-20 | 2006-03-02 | Totan Kako Kk | 複合材料及び該複合材料を用いた摺動部材 |
| JP5905699B2 (ja) * | 2011-10-07 | 2016-04-20 | 大豊工業株式会社 | 燃料噴射ポンプ用黒鉛添加軸受 |
| CN105492516A (zh) * | 2013-03-22 | 2016-04-13 | 3M创新有限公司 | 具有干运转能力的聚合物滑动材料和具有干运转能力的滑环密封件 |
| CN107532723B (zh) * | 2015-04-16 | 2019-11-22 | 伊格尔工业股份有限公司 | 滑动部件 |
| CN109642615B (zh) * | 2016-08-26 | 2020-09-22 | 日本精工株式会社 | 滚动轴承及其制造方法 |
| JP7626380B2 (ja) * | 2019-02-06 | 2025-02-04 | 大豊工業株式会社 | 摺動部材 |
| US20220389961A1 (en) * | 2019-11-15 | 2022-12-08 | Eagle Industry Co., Ltd. | Sliding components |
| JP7157364B2 (ja) * | 2021-02-26 | 2022-10-20 | ダイキン工業株式会社 | 共重合体、成形体および射出成形体 |
| WO2022209966A1 (ja) * | 2021-03-30 | 2022-10-06 | イーグル工業株式会社 | 摺動部品 |
-
2022
- 2022-03-17 US US18/284,281 patent/US20240167509A1/en active Pending
- 2022-03-17 CN CN202280023959.XA patent/CN117043496A/zh active Pending
- 2022-03-17 JP JP2023510942A patent/JP7661481B2/ja active Active
- 2022-03-17 WO PCT/JP2022/012342 patent/WO2022209965A1/ja not_active Ceased
- 2022-03-17 EP EP22780184.2A patent/EP4317729A4/en active Pending
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| JP2004225725A (ja) | 2003-01-20 | 2004-08-12 | Eagle Ind Co Ltd | 摺動部品 |
| JP2008128220A (ja) * | 2006-11-24 | 2008-06-05 | Hitachi Appliances Inc | 冷凍装置 |
| JP2009091661A (ja) * | 2008-11-14 | 2009-04-30 | Totan Kako Kk | 複合材料、複合材料の製造方法及び該複合材料を用いた摺動部材 |
| JP2011058517A (ja) | 2009-09-07 | 2011-03-24 | Nippon Pillar Packing Co Ltd | ドライコンタクトメカニカルシール |
| JP2019015309A (ja) * | 2017-07-04 | 2019-01-31 | イーグル工業株式会社 | メカニカルシール |
Non-Patent Citations (1)
| Title |
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| See also references of EP4317729A4 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7661481B2 (ja) | 2025-04-14 |
| JPWO2022209965A1 (ja) | 2022-10-06 |
| US20240167509A1 (en) | 2024-05-23 |
| EP4317729A4 (en) | 2025-04-02 |
| CN117043496A (zh) | 2023-11-10 |
| EP4317729A1 (en) | 2024-02-07 |
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