WO2006073171A1 - Dispositif de buse de pulverisation thermique et equipement de pulverisation thermique - Google Patents

Dispositif de buse de pulverisation thermique et equipement de pulverisation thermique Download PDF

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Publication number
WO2006073171A1
WO2006073171A1 PCT/JP2006/300065 JP2006300065W WO2006073171A1 WO 2006073171 A1 WO2006073171 A1 WO 2006073171A1 JP 2006300065 W JP2006300065 W JP 2006300065W WO 2006073171 A1 WO2006073171 A1 WO 2006073171A1
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Prior art keywords
nozzle
gas
particle
thermal spray
diameter
Prior art date
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Ceased
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PCT/JP2006/300065
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English (en)
Japanese (ja)
Inventor
Tsuyoshi Oda
Toshiya Miyake
Hideo Hata
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Kobe Steel Ltd
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Kobe Steel Ltd
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Filing date
Publication date
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Priority to EP06702045A priority Critical patent/EP1834699A4/fr
Publication of WO2006073171A1 publication Critical patent/WO2006073171A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/168—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed with means for heating or cooling after mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1463—Arrangements for supplying particulate material the means for supplying particulate material comprising a gas inlet for pressurising or avoiding depressurisation of a powder container
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/123—Spraying molten metal

Definitions

  • the present invention relates to a thermal spray nozzle apparatus and a thermal spray apparatus that form a coating film or a deposited layer by using a gas to atomize a thermal spray material and causing it to collide with a base material.
  • thermal spraying has been known as a technique for forming a coating by heating a coating material and causing fine particles in a molten and semi-molten state to collide with a substrate surface at a high speed.
  • cold spray is different from other thermal spraying methods because it forms a coating by impinging on a substrate in a solid state in supersonic flow with an inert gas without melting or gasifying the thermal spray material.
  • inert gas without melting or gasifying the thermal spray material.
  • FIG. 32 shows a schematic configuration of the cold spray apparatus.
  • the high-pressure gas supplied from the gas source 30 is branched into two pipe lines 31, 32.
  • the mainstream gas flowing in the pipe line 31 is heated by the gas heater 33, and the remaining gas flowing in the pipe line 32 is introduced into the powder feeder 34.
  • the gas heated by the gas heater 33 is introduced into the chamber 36 through the pipe 35, and the powder supplier 34 supplies the powder particles to the chamber 36 through the pipe 37.
  • the mixture of gas and powder particles mixed in the chamber 36 is a converging part 3 of the supersonic nozzle 38.
  • a molten metal is used as a thermal spray material, and a thin film state is formed from a container having a slit-like outlet
  • a method of atomizing and spraying with a sonic gas flow passing through a nozzle having a slit-like orifice provided in the vicinity of the nozzle outlet in a laminar state is also proposed! (For example, see Patent Document 2).
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-76157
  • Patent Document 2 Japanese Translation of Special Publication 2002-508441
  • the powder particles at room temperature collide, and the heat generated during plastic deformation causes the heat generated locally to be heated above the melting point and adhere to the substrate.
  • a gas pressure of 1.0 to 3. OMPa is necessary, and it is difficult to handle because the gas needs to be preheated to 600 ° C. Moreover, it is not easy to supply the powder particles uniformly.
  • the latter thermal spraying apparatus atomizes at supersonic speed, but does not design a nozzle to accelerate particles, so that HIP (Hot Isostatic Pressing) can be omitted. It is impossible to obtain a high-density coating or high-density deposition.
  • the present invention has been made in consideration of the problems in the conventional thermal spraying apparatus as described above.
  • the thermal spraying nozzle can supply the thermal spraying material at a constant level and can control the coating or the deposition state.
  • An apparatus and a thermal spraying apparatus are provided.
  • the thermal spray nozzle device of the present invention is a thermal spray nozzle device that introduces a carrier gas from the inlet side of the nozzle to form an ultra-high-speed gas flow, atomizes the thermal spray material by the gas flow, and discharges it.
  • a reservoir for storing molten metal, which is the spray material is connected to the inlet side end of the nozzle via a communication path, and the nozzle includes a throat portion for forming a supersonic gas flow, and a throat portion thereof.
  • a diameter-enlarged flow path formed on the downstream side in the direction of the outlet. The diameter-enlarged flow path cools the metal particles atomized by the supersonic gas flow to a solidified or semi-solidified state.
  • the gist is that the outlet side force of the nozzle is configured to discharge in a predetermined direction.
  • a molten metal lead-out pipe extends from the storage portion toward the center of the throat or the downstream side of the throat portion.
  • the accelerated carrier gas flows through the outer part of the metal lead-out tube It is preferable to configure the flow path.
  • the gist of the nozzle of the present invention is that the opening angle force half apex angle of the diameter-enlarged flow path portion on the downstream side of the throat portion is 15 ° or less.
  • the length of the diameter-enlarged flow path portion is a flight distance until the atomized metal particles become solidified or semi-solidified, and the flight distance of the atomized metal particles, the metal particle temperature, Specifically, the flight distance until the atomized metal particles become solidified or semi-solidified is determined by the solidification or semi-solid state of the atomized metal particles. The flight time until it changes to the solidified state is obtained, and the flight time is calculated by substituting the flight time into the following formula. The length of the above-mentioned expanded flow path section is set to be longer than the flight distance. This is the gist.
  • u is the gas flow velocity
  • gas density is the particle density
  • d is the particle diameter
  • a is the sound velocity of the gas g g s s g.
  • the carrier gas is introduced into the nozzle in a state where the pressure P satisfies the following formula.
  • ⁇ is the specific heat ratio of the compressed gas
  • ⁇ is the number of Matsuhs at the nozzle expansion part downstream of the throat part.
  • the thermal spraying apparatus of the present invention collides the thermal spray nozzle apparatus having the above configuration, a carrier gas supply apparatus that is connected to the nozzle via a conduit and introduces carrier gas under pressure, and the nozzle and the discharged particles.
  • a sealed container for storing the base material to be removed, and the pressure in the sealed container is reduced.
  • the gist of the present invention is that it comprises a decompression means.
  • the thermal spraying device of the present invention is connected to the thermal spray nozzle device having the above-described configuration via a connecting pipe and continuously pressurizes and supplies the molten metal to the molten metal in the reservoir.
  • the gist of the invention is that it comprises a metal supply device and a substrate supply device that continuously supplies the substrate.
  • the sprayed material can be supplied constantly, and the coating or the deposition state can be controlled.
  • FIG. 1 is a perspective view showing a configuration of a thermal spray nozzle device according to the present invention.
  • FIG. 2 (a) and (b) are explanatory diagrams showing the definition of the nozzle enlarged portion.
  • FIG. 3 is a graph for explaining the relationship between the Mach number and the resistance coefficient.
  • FIG. 4 is a graph showing the nozzle length according to the particle diameter.
  • FIG. 5 is an explanatory view showing a conventional nozzle opening angle.
  • FIG. 6 is an explanatory diagram showing a case where a shock wave is generated in the nozzle.
  • FIG. 7 is an explanatory diagram showing a case where the entire nozzle area has a supersonic flow.
  • FIG. 8 is a graph showing a typical example of a nozzle shape.
  • FIG. 9 is a graph showing the nozzle outlet diameter that achieves appropriate expansion.
  • FIG. 10 is a graph showing the relationship between the nozzle length and the Mach number when the particle diameter is 20 ⁇ m and the throat diameter is 25 mm.
  • FIG. 11 is a graph showing the nozzle length and gas temperature Z velocity distribution when the particle diameter is 20 m and the throat diameter is 25 mm.
  • FIG. 12 is a graph showing the nozzle length and particle temperature Z velocity distribution at a particle diameter of 20 m and a throat diameter of 25 mm.
  • FIG. 13 is a graph showing the relationship between the nozzle length and the Mach number when the particle diameter is 20 ⁇ m and the throat diameter is 35 mm.
  • FIG. 14 is a graph showing the nozzle length and gas temperature Z velocity distribution when the particle diameter is 20 m and the throat diameter is 35 mm.
  • FIG. 16 is a graph showing the relationship between the nozzle length and the Mach number when the particle diameter is 50 ⁇ m and the throat diameter is 25 mm.
  • FIG. 17 is a graph showing the nozzle length and gas temperature Z velocity distribution when the particle diameter is 50 m and the throat diameter is 25 mm.
  • FIG. 18 is a graph showing the nozzle length and particle temperature Z velocity distribution at a particle diameter of 50 m and a throat diameter of 25 mm.
  • FIG. 19 is a graph showing the relationship between the nozzle length and the Mach number when the particle diameter is 50 ⁇ m and the throat diameter is 35 mm.
  • FIG. 20 is a graph showing the nozzle length and gas temperature Z velocity distribution when the particle diameter is 50 m and the throat diameter is 35 mm.
  • FIG. 21 is a graph showing the nozzle length and particle temperature Z velocity distribution when the particle diameter is 50 m and the throat diameter is 35 mm.
  • FIG. 22 is a graph showing the relationship between nozzle length and Mach number when the particle diameter is 100 ⁇ m.
  • FIG. 23 is a graph showing the nozzle length, gas temperature and velocity distribution at a particle size of 100 ⁇ m.
  • FIG. 24 is a graph showing the nozzle length, particle temperature and velocity distribution when the particle diameter is 100 ⁇ m.
  • FIG. 25 is an explanatory view showing a configuration of a thermal spraying apparatus applied to batch processing.
  • FIG. 26 is an explanatory view showing a configuration of a thermal spraying apparatus applied to a continuous molding process.
  • FIG. 27 is a view corresponding to FIG. 1, showing a second embodiment of the nozzle according to the present invention.
  • FIG. 28 is a view corresponding to FIG. 1, showing a third embodiment of the nozzle according to the present invention.
  • FIG. 29 is a view corresponding to FIG. 1, showing a fourth embodiment of the nozzle according to the present invention.
  • FIG. 30 is a view corresponding to FIG. 1, showing a fifth embodiment of the nozzle according to the present invention.
  • FIG. 31 is a view corresponding to FIG. 1, showing a sixth embodiment of the nozzle according to the present invention.
  • FIG. 32 is an explanatory view showing a configuration of a conventional cold spray apparatus.
  • FIG. 1 shows a basic configuration of a thermal spray nozzle device according to the present invention.
  • a spray nozzle apparatus 1 shown in FIG. 1 directly supplies a molten metal M into a supersonic nozzle (hereinafter abbreviated as a nozzle) 2.
  • the atomized metal particles (hereinafter abbreviated as particles) are accelerated in the nozzle 2 and rapidly cooled and solidified. That is, the thermal spray nozzle device 1 of the present invention is integrally provided with a throat portion 2a where the atomizing process is performed and a diameter-enlarged flow path portion 2b where the flight cooling process is performed continuously with the atomizing process.
  • reference numeral 4 denotes a storage portion for storing the molten metal M, and has a communication path 4 a communicating with the nozzle 2.
  • the leading end of the communication passage 4a extends as a molten metal outlet tube 4b toward the center of the cylindrical hole of the throat portion 2a. Is starting to flow.
  • the principle that the solidified particles collide with the base material 3 is the same as that of the conventional cold spray.
  • the collided particles are remarkably plastically deformed and dented into a crater, and a dense structure without voids is formed in the skin (or (Deposited layer) It can be obtained inside. Therefore, it is not necessary to perform HIP (Hot isostatic pressing) treatment as a post-treatment, that is, to remove residual voids by applying pressure to the molding material on which the film is formed.
  • HIP Hot isostatic pressing
  • the Mach number is low (for example, about Mach number 2) compared to cold spray. Even in the case of collision, the surface temperature of the base material 3 becomes higher than the melting point, so that the particles can reliably adhere to the base material 3.
  • the above Mach number means the gas velocity Z sound velocity.
  • the nozzle 2 is configured such that the nozzle length of the enlarged portion is set to 100 mm or more, and operates in a state where the carrier gas total pressure p satisfies the following formula (1).
  • p total carrier gas pressure (inlet pressure upstream of throat)
  • p nozzle outlet back pressure
  • M nozzle outlet back pressure
  • the Mach number M is related to the cross-sectional area A * of the throat portion 6 and the enlarged cross-sectional area A in the nozzle by the equation (2).
  • the enlarged cross-sectional area is a conical enlarged portion whose diameter gradually increases from the narrowest portion A * as the throat portion toward the downstream side, and FIG. As shown in b), it includes an enlarged part whose diameter suddenly expands from the narrowest part A * toward the downstream side and then becomes substantially constant.
  • V is the gas velocity at the inlet of the nozzle
  • V is the liquid velocity
  • D is the droplet after the break.
  • Diameter, ⁇ Liquid surface tension.
  • the diameter of the aluminum alloy particle after atomization obtained from equation (3) is about 20 m.
  • the acceleration and cooling during this period can be estimated by numerical analysis. Specifically, the mass conservation, momentum conservation, and energy conservation equations of the quasi-one-dimensional compressible fluid conservation type display are solved by simultaneous equations (4) and particle motion equations (6).
  • A Nozzle cross-sectional area
  • Second phase (droplet, particle, powder)
  • the velocity of the particle can be obtained by solving the particle equation of motion (6).
  • the resistance coefficient is calculated using Kurten's formula (8)!
  • the particle temperature can be obtained by solving the particle energy equation (9), c h, u t ,,
  • the nozzle outlet force is set to a very short distance to the deposit. It has become. Therefore, it can be approximated that the particle velocity and enthalpy at the nozzle outlet are almost maintained.
  • the state of the deposit is greatly affected by the state of the particles at the time of deposition, but in the case of colliding and depositing the particles at a subsonic speed like a conventional thermal spray nozzle device, the particles are in a solidified state. And the substrate cannot be attached to the deposit.
  • the thermal spray nozzle device of the present invention has the operating condition of colliding and depositing semi-solid or solidified particles at a supersonic speed, which has a higher solid phase ratio, which has not been used conventionally. It is what. Therefore, assuming that the molten metal is atomized and changes to a semi-solid state during the flight, the minimum flight distance required so far is obtained, and this flight distance is required for the device. It is specified as the minimum nozzle length.
  • equation of motion representing particle acceleration is as shown in equation (6), 3 du sf -p g u
  • u is the gas flow velocity, is the gas density, is the particle density, and d is the particle diameter g g s S
  • Equation (19) is obtained.
  • the gas temperature ⁇ and the nozzle wall m s m s surface temperature ⁇ are also approximately constant.
  • Obtaining the minimum nozzle length means obtaining the shortest flight time t until the particles reach semi-solidification. In this case, the equality is established in equation (21). .
  • Equation (22) finds the minimum force flight time t and substitutes it into Equation (18) to obtain f
  • the shortest flight distance, ie, the minimum nozzle length 1 is obtained.
  • the thermal spray nozzle device of the present invention is a device using a nozzle having a nozzle length of 1 or more.
  • Fig. 4 is a graph in which the minimum nozzle length is specifically determined using aluminum and copper.
  • the particles with various particle sizes are in a semi-solid state exceeding a solid phase ratio of 0.5. This shows the nozzle length required in this case.
  • the horizontal axis indicates the particle diameter
  • the vertical axis indicates the nozzle length.
  • the carrier gas conditions are the same as in Table 1 below. Like.
  • the nozzle opening angle (on the downstream side of the throat portion).
  • a large nozzle with a half apex angle (open angle of the expanded flow path) of 0> 15 ° is used.
  • the half apex angle means an angle formed by the nozzle central axis and the nozzle inner wall.
  • the nozzle of the present invention has a nozzle opening angle of 15 ° or less, prevents flow separation, and allows the particles to adhere to the substrate even in a semi-solidified state. The latter particles are accelerated to supersonic speed.
  • the nozzle of the present invention has a configuration in which the distance from the narrowest part of the nozzle to the site where the shock wave front is generated is extended until the particles reach a solidified or semi-solid state.
  • the conditions of the supersonic nozzle of the present invention can be defined by the following (a) to (c).
  • the nozzle opening angle is 0 ⁇ 15 ° at the half apex angle.
  • Nozzle opening angle is half-vertical angle 0 ⁇ 15 °, carrier gas total pressure p, nozzle outlet
  • the nozzle cross-sectional area A is calculated, and the nozzle length 1 force equation (18) up to the position where the nozzle cross-sectional area A is reached and the relational equation that defines the shortest flight time until the particles reach semi-solidification (22 ) And the minimum nozzle length is 1 or more.
  • FIG. 6 shows a case where a shock wave is generated in the nozzle.
  • the nozzle opening angle is a half apex angle and ⁇ ⁇ 15 °, the nozzle length 1 is equal to equation (18), and the particles are half f
  • the shortest nozzle length obtained from the relational expression (22) that defines the shortest flight time until solidification is reached is 1 or more, and is obtained from expression (25) based on the carrier gas total pressure p and nozzle outlet back pressure p.
  • Nozzle cross-sectional area A 1S Nozzle outlet cross-sectional area A obtained by substituting the total shock wave upstream Mach number M into equation (26).
  • Table 1 shows the material properties and constraint conditions used in the actual nozzle calculation.
  • the maximum half apex angle in the table means the maximum angle between the nozzle center axis and the nozzle inner wall.
  • gas mass flow rates correspond to 0.9 [kg / s] (throat diameter ⁇ 25) and 1.8 [kg / s] (throat diameter ⁇ 35), respectively.
  • the maximum half apex angle of the nozzle is set to 5 ° (see Table 1).
  • This nozzle (a) quickly expands to the maximum diameter so that dispersed droplets after atomization do not adhere to the nozzle wall, and (b) maximizes the speed to accelerate the particles. It is configured to increase the length of the straight pipe at the maximum diameter.
  • the nozzle of the present embodiment is generally used in cold spray! /, Compared to a conical nozzle, the pressure ratio is lower than the design value, and many cold particles were supplied. In this case, there is a disadvantage that the straight pipe occupying most of the nozzles becomes subsonic. For this reason, it is unsuitable for operation outside the design value, and is suitable for production equipment that repeats operation under the same conditions. Therefore, the graph of Fig. 9 shows the nozzle outlet diameter that achieves appropriate expansion when it is assumed that the engine is operated under the same conditions.
  • the nozzle outlet diameter increases as the molten metal flow rate increases.
  • the gas receives the heat brought in by the molten metal. This is because it can be expanded.
  • Table 2 shows the relationship between the nozzle throat diameter and the gas mass flow rate obtained as a result of the design calculation with the actual nozzles, without heating.
  • Figures 10 to 12 show the Mach number distribution in the nozzle, the gas temperature Z velocity distribution, and the particle temperature Z velocity distribution when the particle diameter after atomization is ⁇ m and the nozzle throat diameter is 25 mm, respectively.
  • Distance on the horizontal axis indicates the nozzle length
  • Mach number on the vertical axis indicates the Mach number
  • Gas temp indicates the gas temperature
  • Gas Velc indicates the gas flow rate
  • Solid temp Indicates the particle temperature and Solid Velc indicates the particle velocity.
  • Figures 13 to 15 show the Mach number distribution in the nozzle, the gas temperature Z velocity distribution, and the particle temperature Z velocity distribution when the particle diameter after atomization is 20 m and the nozzle throat diameter is 35 mm, respectively. .
  • the nozzle outlet diameter is determined so as to achieve proper expansion after heating, so that the gas velocity at which the gas static pressure is almost equal to atmospheric pressure is about 5 lOmZs.
  • the force particle speed is only about 400 mZs when solidification is completed with a nozzle length of about 160 mm. In this case, if the nozzle length is extended to 500 mm, the force that can accelerate the particle velocity to 480 mZs, the particle temperature at this time will be cooled to 400K.
  • Figures 16 to 18 show the Mach number distribution in the nozzle, the gas temperature Z velocity distribution, and the particle temperature Z velocity distribution when the particle diameter after atomization is ⁇ m and the nozzle throat diameter is 25 mm, respectively.
  • FIGS. 19 to 21 show the Mach number distribution in the nozzle, the gas temperature Z velocity distribution, and the particle temperature Z velocity distribution when the particle diameter after atomization is ⁇ 50 m and the nozzle throat diameter is ⁇ 35 mm, respectively. .
  • the particle diameter is 50 m, it takes about 1.2 m in the nozzle to complete solidification.
  • the nozzle length is extended by 1.2 m, it will conveniently approach the asymptotic line of particle acceleration.
  • the particle temperature is 750K
  • the particle speed is 470mZs
  • the particles are released by the nozzle force.
  • Figures 22 to 24 show the Mach number distribution in the nozzle, the gas temperature Z velocity distribution, and the particle temperature Z velocity distribution when the particle size after atomization is ⁇ 100 ⁇ m.
  • Fig. 25 shows a configuration when the thermal spraying apparatus according to the present invention is applied to batch processing.
  • helium gas is preferably used instead of nitrogen gas because it has a low molecular weight because the speed of sound increases when particles are accelerated.
  • the carrier gas supplied from the helium gas cylinder 10 is branched into two pipelines 11 and 12, and the carrier gas flowing through the pipeline 11 applies a head pressure to the molten metal stored in the reservoir 4.
  • the carrier gas flowing through the conduit 12 is introduced into the nozzle 2 and is accelerated to supersonic speed by passing through the throat portion 2a.
  • the helium cylinder 10 and the pipelines 11 and 12 function as a carrier gas supply device that introduces carrier gas under pressure.
  • the molten metal flowing down from the reservoir 4 is atomized by the supersonic gas flow in the nozzle 2, and is further cooled in the nozzle 2 and discharged from the tip of the nozzle 2.
  • the discharged particles collide with and adhere to the surface of the substrate 3.
  • the nozzle 2 and the base material 3 are accommodated in a chamber 13 as an airtight container, and this chamber 13 is connected to an air storage tank 16 via a cyclone device 14 as an exhaust device and an exhaust vacuum pump (decompression means) 15. It has been done.
  • the cyclone device 14 collects particles floating in the exhaust and supplies only the gas to the exhaust vacuum pump 15.
  • the exhaust device is provided to increase the Mach number of the carrier gas and increase the particle velocity, and the helium gas collected in the storage tank 16 is compressed by the compressor 17 and reused. It has become so.
  • Fig. 26 shows a basic configuration when the thermal spraying apparatus according to the present invention is applied to a continuous molding process.
  • a continuous melting furnace 20 is connected to the storage section 4, and the storage section 4 and the continuous melting furnace 20 are communicated with each other via a connecting pipe 21.
  • the continuous melting furnace 20 The height of the reservoir 4 is set so that the internal pressure of the reservoir 4 becomes 0.8 MPa due to the pad pressure.
  • the continuous melting furnace 20 arranged at the predetermined height functions as a molten metal supply device that continuously supplies pressurized molten metal with pressure.
  • the molten metal can be continuously supplied from the reservoir 4 to the nozzle 2.
  • the base material 22 rotates in the direction of arrow A, and is pulled out in the direction of arrow B by the rotation of take-up rollers (base material supply devices) 23a and 23b. Thereby, the particles can be continuously sprayed and formed on the base material 22.
  • FIGS. 27 to 31 show another embodiment of the nozzle 2 of the present invention.
  • the nozzle itself is made of a non-metal such as ceramic or carbon, thereby reducing the surface affinity.
  • the metal particles adhering to the inner wall of the nozzle can be easily blown off by the supersonic gas flow.
  • the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
  • a nozzle 41 is manufactured by using zirconia to spray an aluminum alloy, and the outside is covered with a ceramic cylinder 42.
  • Nozzle heater 43 that can be heated up to 900 ° C is wound several times.
  • the nozzle 41 for example, high strength added with yttria (Y O) as a stabilizer,
  • partially stable zirconia with high wear resistance and high corrosion resistance.
  • the nozzle 44 shown in Fig. 28 is composed of a ceramic fiber heater 45, and more specifically, heat is generated in a high-temperature insulating ceramic fiber that is made of a material mainly composed of alumina and silica. It is configured by embedding the body and integrally molding it.
  • 46a and 46b indicate heater electrode connections!
  • the nozzle 47 shown in Fig. 29 is configured such that a carbon heater 49 is provided around the outer wall of the body of the ceramic nozzle 48 and heated by radiation.
  • the carbon heater 49 is divided into a plurality of portions by slits 5 Id, 5 le alternately formed with a fixed length from the upper and lower sides of the cylindrical nozzle 48, and 49a and 49b are This is an electrode connection portion of the carbon heater 49. 50 has a mirror-finished inner wall. This is a cylindrical reflection case provided to increase radiation efficiency.
  • the carbon heater 49 when electric power is supplied to the carbon heater 49 from a power source (not shown) through the electrode connection portions 49a and 49b, the carbon heater 49 also generates internal force due to Joule heat generation due to energization, thereby The ceramic nozzle 48 is heated by the radiant heat transfer from the carbon heater 49, and the metal adhering to the inner wall of the nozzle 37 is melted.
  • the nozzle 51 shown in FIG. 30 is manufactured by using the carbon heater 52, and 52a and 52b indicate the electrode connection portions. If the ceramic nozzle is replaced with a carbon or carbon composite nozzle, the emissivity of the nozzle surface is further increased and the heating efficiency of the nozzle 51 can be further increased.
  • the entire apparatus is covered with a chamber, and a gas such as argon or nitrogen is used as a high-pressure gas to replace the inside of the chamber with an inert atmosphere.
  • a gas such as argon or nitrogen is used as a high-pressure gas to replace the inside of the chamber with an inert atmosphere.
  • the nozzle may be made of a metal material such as copper having a good thermal conductivity, and the ceramic coating may be formed by applying ceramic spray to the inner wall of the nozzle. As with each nozzle, the affinity can be degraded.
  • a copper nozzle 54 is formed on the inner surface with a zirconia coating 55 (the portion indicated by the thick broken line in the figure), and the nozzle heater 43 is wound around the outer peripheral surface several times. It is.
  • the thermal spray nozzle device and the thermal spray apparatus of the present invention are used in a field where it is required to supply a constant amount of the thermal spray material on the base material and control the coating film or the deposition state formed on the base material. Is preferred.

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  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention concerne un dispositif de buse de pulvérisation thermique et un équipement de pulvérisation thermique permettant un apport constant de la matière de pulvérisation thermique et de régler l'état de formation du film ou du dépôt. Dans le dispositif de buse de pulvérisation thermique destiné à former un flux gazeux à très grande vitesse, un gaz porteur est introduit à l'entrée de la buse, et une matière de pulvérisation thermique est ensuite atomisée au moyen dudit flux gazeux et déchargée; une partie stockage (4), destinée à stocker un métal fondu comme matière de pulvérisation thermique, est reliée à l'extrémité d'entrée de la buse (2) par un passage. La buse comporte une partie rétrécie (2a) destinée à accélérer à une vitesse supersonique le gaz porteur introduit, et une partie canal (2b) de diamètre élargi formée en aval de la partie rétrécie, en direction de l'orifice de sortie. La buse de pulvérisation thermique est caractérisée en ce que les particules métalliques atomisées par le flux gazeux supersonique sont refroidies de manière à atteindre un état solide ou semi-solide dans la partie canal de diamètre élargi.
PCT/JP2006/300065 2005-01-07 2006-01-06 Dispositif de buse de pulverisation thermique et equipement de pulverisation thermique Ceased WO2006073171A1 (fr)

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EP06702045A EP1834699A4 (fr) 2005-01-07 2006-01-06 Dispositif de buse de pulverisation thermique et equipement de pulverisation thermique

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JP2005002535 2005-01-07
JP2005-002535 2005-01-07

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WO2006073171A1 true WO2006073171A1 (fr) 2006-07-13

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US (1) US20070295833A1 (fr)
EP (1) EP1834699A4 (fr)
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WO (1) WO2006073171A1 (fr)

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EP1925360A1 (fr) * 2006-11-23 2008-05-28 Lachenmeier, Walter Process and Apparatus for the production of fine particles
CN100404142C (zh) * 2006-07-24 2008-07-23 南开大学 超声喷雾热分解喷头
TWI693107B (zh) * 2019-04-10 2020-05-11 大陸商業成科技（成都）有限公司 可提高曲面噴塗均勻性之噴塗裝置

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US8744251B2 (en) 2010-11-17 2014-06-03 3M Innovative Properties Company Apparatus and methods for delivering a heated fluid
US8544408B2 (en) * 2011-03-23 2013-10-01 Kevin Wayne Ewers System for applying metal particulate with hot pressurized air using a venturi chamber and a helical channel
JP6472139B2 (ja) * 2015-06-15 2019-02-20 富士フイルム株式会社 オリフィス、及びこれを用いた送液装置、塗布装置、並びに光学フィルムの製造方法
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CN109647240B (zh) * 2018-12-28 2020-08-28 西安交通大学 一种喷雾式射流与主流气体掺混的组织方法
DE102019109195A1 (de) 2019-04-08 2020-10-08 Norma Germany Gmbh Strahlpumpe
CN110848065B (zh) * 2019-11-13 2021-07-02 北京工业大学 一种自动识别柴油喷雾破碎过程自动实现喷雾连续计算的方法
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CN112049993B (zh) * 2020-07-24 2025-03-11 中国航天空气动力技术研究院 能够快速更换的高压气流量测量与控制装置及更换方法
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EP1925360A1 (fr) * 2006-11-23 2008-05-28 Lachenmeier, Walter Process and Apparatus for the production of fine particles
TWI693107B (zh) * 2019-04-10 2020-05-11 大陸商業成科技（成都）有限公司 可提高曲面噴塗均勻性之噴塗裝置

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CN101098759A (zh) 2008-01-02
US20070295833A1 (en) 2007-12-27
EP1834699A4 (fr) 2008-06-25
EP1834699A1 (fr) 2007-09-19

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