EP1652948B1 - Verwendung einer Pulvermischung für Pulvermetallurgie zur Herstellung eines Grünlings - Google Patents

Verwendung einer Pulvermischung für Pulvermetallurgie zur Herstellung eines Grünlings Download PDF

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Publication number
EP1652948B1
EP1652948B1 EP05020609A EP05020609A EP1652948B1 EP 1652948 B1 EP1652948 B1 EP 1652948B1 EP 05020609 A EP05020609 A EP 05020609A EP 05020609 A EP05020609 A EP 05020609A EP 1652948 B1 EP1652948 B1 EP 1652948B1
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Prior art keywords
powder
resin
green compact
thermosetting resin
epoxy
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EP05020609A
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English (en)
French (fr)
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EP1652948A1 (de
Inventor
Kazuhisa c/o Kobe Corp. Res. Lab. Fujisawa
Takayasu c/o Kobe Corp. Res. Lab. Fujiura
Hironori c/o Takasago Works Suzuki
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Kobe Steel Ltd
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Kobe Steel Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles

Definitions

  • the present invention relates to the use of a mixed powder for powder metallurgy as a feedstock of a green compact having an adequate density and strength even before the sintering process and having an excellent machinability.
  • a powder metallurgy is a technology used for producing machine parts and oil-impregnated bearings from a metal powder. Since highly accurate products can be efficiently mass-produced, the powder metallurgy is indispensable particularly in the automobile industry and the like.
  • this powder metallurgy in general, a mixed powder including a metal powder is molded by compression and the resultant green compact is then dewaxed. Subsequently, for example, in an iron-based powder metallurgy, the compact is sintered at a temperature of about 1,000°C to about 1,300°C. In this sintering process, the mixed metal powder forms an alloy, thereby increasing the strength of the compact. A cutting operation is then performed on the resultant sintered compact.
  • Such a sintered compact has an excessively high strength from the viewpoint of a cutting operation. Furthermore, the lifetime of a cutting tool used is shortened because of the high strength of the sintered compact.
  • a green compact cannot be subjected to a cutting operation prior to sintering because the green compact is brittle. Accordingly, a technology is desired by which the strength of a green compact prior to the sintering process is increased, so that the green compact can subsequently be subjected to a cutting operation and finally sintered.
  • a document by Tianjun Liu et al. discloses an example of such a technology.
  • a polymer lubricant is added to a mixed powder, which constitutes a feedstock, and a green compact made of the resultant mixed powder is heated at a temperature lower than the sintering temperature. Consequently, the strength of the compact can be increased only by this heat treatment and thus a cutting operation can be performed prior to the sintering process.
  • the fluidity of the mixed powder is one of its important characteristics.
  • a low fluidity of a mixed powder causes the following problems. For example, a bulging can occur at the upper part of a discharging hole of a hopper, resulting in a discharge failure. Also, the mixed powder can become clogged in a hose connecting from the hopper to a shoe box. Furthermore, even if a mixed powder having a low fluidity is compulsorily discharged from the hose, the powder may not satisfactorily fill a die, in particular, a die having thin walls. Consequently, a satisfactory compact may not be formed. For these reasons, a raw powder for powder metallurgy having excellent fluidity has been strongly desired.
  • thermosetting resin is added to a magnetic powder or the like, and a heat treatment is then performed.
  • a compact is cured without sintering while the magnetic properties of the compact are ensured.
  • the resultant compact is used without further treatment. Accordingly, this manufacturing technology of a bonded magnet may be applied to the powder metallurgy.
  • known manufacturing technologies of bonded magnets cannot be applied to the powder metallurgy as they are.
  • Japanese Unexamined Patent Application Publication Nos. 4-284602 paragraph No. 0007, and Examples
  • 6-112022 paragraph Nos. 0015 and 0016, and Examples
  • 6-188137 paragraph Nos. 0015 and 0020, and Examples
  • 8-31677 paragraph Nos. 0031 and 0033, and Examples
  • the type and the particle diameter of the thermosetting resin are not studied in detail because these technologies relate to a bonded magnet and their objects are different from the object of the present invention.
  • thermosetting resin is relatively large from the viewpoint of application to the powder metallurgy.
  • the content of a thermosetting resin binder is 0.5 to 4 mass percent based on an alloy.
  • 0.5 to 5 parts by weight (in particular, 1 to 3 parts by weight) of a thermosetting resin is added to 100 parts by weight of a magnetic powder.
  • the amount of a thermosetting resin relative to the total amount of an alloy powder is 2 mass percent or more. According to investigations made by the inventors of the present invention, when a thermosetting resin is excessively added to a mixed powder for powder metallurgy, the fluidity of the powder and the density of the green compact are decreased.
  • the compounding ratio of the epoxy resin powder to the magnetic powder is 0.1 to 0.5 mass percent.
  • An inorganic additive is added to the mixed powder in order to suppress the abrasion with a die during molding.
  • a component that improves the strength or machinability of the compact is not considered.
  • the content of this inorganic additive is very small (20 to 40 mass percent of the total amount of the resin binder, 0.02 to 0.2 mass percent of the total amount of the magnetic powder). Therefore, even if the inorganic additive has a function of enhancing the strength of the compact or the like, the function may not be fulfilled in such a small content.
  • US-A-5980603 discloses the use of a thermosetting resin for producing pressed and cured parts.
  • the inventors of the present invention have extensively studied, in particular, the composition of a mixed powder for powder metallurgy and found the following: When a component for improving mechanical properties and a thermosetting resin powder are added to a base powder, and in addition, an appropriate thermosetting resin powder is used, a green compact having an adequate density and strength can be produced.
  • the present invention has been made on the basis of this finding.
  • a mixed powder for powder metallurgy is used as a feedstock of a green compact, and the mixed powder includes an iron powder and/or an iron alloy powder, a component for improving mechanical properties, and a thermosetting resin powder.
  • the thermosetting resin powder is composed of at least one resin selected from the group consisting of an epoxy-polyester-based resin, an epoxy-based resin, and an acrylic-based resin.
  • the average particle diameter of the thermosetting resin powder is 100 ⁇ m or less
  • the content of the thermosetting resin powder relative to the total amount of the iron powder and/or the iron alloy powder is 0.05 to 1.0 mass percent.
  • the mixed powder for powder metallurgy preferably further includes a lubricant.
  • a lubricant can decrease the coefficient of friction between the green compact and a die. As a result, the generation of die galling and damage of the die can be suppressed.
  • the lubricant is preferably at least one compound selected from the group consisting of ethylenebisstearamide, stearamide, zinc stearate, and lithium stearate. This is because these compounds are excellent as an additional component of the mixed powder for powder metallurgy.
  • the component for improving mechanical properties is at least one substance selected from the group consisting of copper, nickel, chromium, molybdenum, graphite, and manganese sulfide. This is because these substances are diffused into the iron powder or the like during the sintering process. Consequently, the hardness or the toughness of the compact can be improved or the machinability of the compact can be improved.
  • a green compact obtained by the method of the present invention is made of the above-described mixed powder for powder metallurgy.
  • the mixed powder for powder metallurgy used by the present invention has excellent fluidity and the like and provides an excellent productivity. Furthermore, since a green compact using this mixed powder as a feedstock has an adequate density and strength even before sintering, the green compact can be subjected to a cutting operation. In addition, since the green compact does not have an excessively high strength, the lifetime of a cutting tool used can be extended. Accordingly, the mixed powder for powder metallurgy used by the present invention and the green compact using the mixed powder as a feedstock are excellent for industrial application from the viewpoint that the productivity of powder metallurgy can be improved.
  • a mixed powder for powder metallurgy used by the present invention includes an iron powder and/or an iron alloy powder, a component for improving mechanical properties, and a thermosetting resin powder.
  • the thermosetting resin powder is composed of at least one resin selected from the group consisting of an epoxy-polyester-based resin, an epoxy-based resin, and an acrylic-based resin; the average particle diameter of the thermosetting resin powder is 100 ⁇ m or less; and the content of the thermosetting resin powder relative to the total amount of the iron powder and/or the iron alloy powder is 0.05 to 1.0 mass percent.
  • the component for improving mechanical properties is added in order to improve the mechanical properties such as the hardness and the toughness of a compact or to improve the machinability of the compact by diffusing into a base iron powder or the like during the sintering process.
  • the component for improving mechanical properties include metal powders used for alloys such as copper, nickel, chromium, and molybdenum powders; and inorganic powders such as graphite and manganese sulfide powders. These components may be used alone or in combinations of two or more powders.
  • the component for improving mechanical properties may be mixed with an iron powder or the like when used. Alternatively, for example, graphite may be uniformly adhered to an iron powder or the like with a binder therebetween when used.
  • the content of metal powder used for alloys serving as a component for improving mechanical properties is 0.1 to 4 mass percent (hereinafter, unless otherwise stated, the "mass percent” is simply represented by "%") relative to the total amount of a base iron powder or the like. At a content of less than 0.1%, a satisfactory improvement of mechanical properties may not be achieved because of a small amount of diffusion in the base powder. On the other hand, at a content exceeding 4%, the improvement of mechanical properties is also decreased. In addition, at such an excessively high content, a green compact having a satisfactory density may not be produced because the compressibility is impaired.
  • the content of inorganic powder such as graphite is 0.1% to 1% relative to the total amount of a base iron powder or the like. At a content of less than 0.1%, the improvement may not be satisfactory. At a content exceeding 1%, the mechanical properties may be impaired.
  • thermosetting resin powder used by the present invention is cured on the surface or inside of a green compact by a simple heat treatment to increase the bonding strength between base iron particles or the like. As a result, even prior to the sintering process, a cutting operation can be performed.
  • the material of the thermosetting resin powder of the present invention mainly include (1) epoxy-polyester-based resins, (2) epoxy-based resins, (3) acrylic-based resins, and (4) mixtures including at least two of these.
  • thermosetting resin powder is not a liquid but must be a powder because it must exhibit fluidity during the production process of a green compact. Accordingly, powder coatings that do not include a pigment and are colorless (i.e., clear powder coatings) can be used for the thermosetting resin powder.
  • epoxy-polyester-based resin refers to an epoxy-group-containing resin crosslinked with a carboxylic-acid-group-containing polyester resin serving as a curing agent.
  • Examples of the epoxy-group-containing resin include compounds having at least two epoxy groups per molecule. More specifically, examples of the epoxy-group-containing resin include reaction products of a novolak-type phenolic resin and epichlorohydrin; reaction products of a bisphenol resin (A, B, F types, and the like) and epichlorohydrin; reaction products of a novolak-type phenolic resin, a bisphenol resin (A, B, F types, and the like), and epichlorohydrin; reaction products of a novolak-type phenolic resin and a bisphenol resin (A, B, F types, and the like); reaction products of a cresol compound such as cresol novolak, and epichlorohydrin; glycidyl ethers obtained by reacting an alcohol compound such as ethylene glycol, propylene glycol, 1,4-butanediol, polyethylene glycol, polypropylene glycol, neopentyl glycol, or glycerol with epichlorohydr
  • the "carboxylic-acid-group-containing polyester resin” includes at least two carboxylic acid groups or carboxylic anhydride groups.
  • Examples of the carboxylic-acid-group-containing polyester resin include resins obtained by condensation polymerization using an acid component mainly composed of a polycarboxylic acid and an alcohol component mainly composed of a polyhydric alcohol.
  • the acid component examples include terephthalic acid, isophthalic acid, phthalic acid, and anhydrides thereof; aromatic dicarboxylic acid such as 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, and anhydrides thereof; saturated aliphatic dicarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and anhydrides thereof; lactones such as ⁇ -butyrolactone and ⁇ -caprolactone; aromatic hydroxymonocarboxylic acids such as p-hydroxyethoxybenzoic acid; and hydroxycarboxylic acids corresponding to these.
  • aromatic dicarboxylic acid such as 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, and anhydrides thereof
  • alcohol component examples include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol 1,4-butanediol, 1,2-pentanediol, 2,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 1, 4-hexanediol, 1,5-hexanediol, 2,5-hexanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, alkylene oxide adducts of bisphenol A, alkylene oxide adducts of bisphenol S, neopentyl glycol, 3-methyl-1,5-pentanediol, 1,2-dodecanediol, 1,2-octadecaned
  • the molar ratio of the total amount of epoxy group in the epoxy-group-containing resin to the total amount of acid group in the carboxylic-acid-group-containing polyester resin is appropriately determined according to the minimum melt viscosity. In general, the molar ratio is preferably 1/1 to 1/0.5, and more preferably 1/0.8 to 1/0.6.
  • epoxy-based resin refers to an epoxy-group- containing resin crosslinked with an amine curing agent or an acid curing agent.
  • epoxy-group-containing resins as those described as a component of the above epoxy-polyester-based resin can be used for this epoxy-group-containing resin.
  • amine curing agent examples include chain aliphatic amines such as ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, dipropylenediamine, diethylaminopropylamine, and hexamethylenediamine; cyclic aliphatic amines such as menthanediamine, isophoronediamine, bis(4-amino-3-methylcyclohexyl)methane, diaminocyclohexylmethane, bis(aminomethyl)cyclohexane, N-aminoethylpiperazine, and 3,9-bis(3-aminopropyl)2,4,8,10-tetraoxaspiro[5.5]undecane; and aromatic amines such as m-xylenediamine, metaphenylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, and diaminodie
  • the acid curing agent examples include aliphatic acid anhydrides such as dodecenylsuccinic anhydride, polyadipic anhydride, polyazelaic anhydride, polysebacic anhydride, poly(ethyloctadecanedioic) anhydride, and poly(phenylhexadecanedioic) anhydride; alicyclic acid anhydrides such as methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methyl himic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, a trialkyltetrahydrophthalic anhydride, and methylcyclohexenedicarboxylic anhydride; aromatic acid anhydrides such as phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, benzophenonetetracarboxylic anhydride, ethylene glycol bistrimellitate,
  • the "acrylic-based resin” refers to an acrylic resin having a glycidyl group in the side chain, the acrylic resin being crosslinked with a dibasic acid serving as a curing agent.
  • Examples of a monomer constituting the "acrylic resin having a glycidyl group in the side chain" include glycidyl acrylate, glycidyl methacrylate, ⁇ -methylglycidyl acrylate, and ⁇ -methylglycidyl methacrylate. These monomers may be used in combinations of two or more monomers. Alternatively, these monomers may be copolymerized with another monomer to prepare the acrylic resin.
  • alkyl vinyl ethers such as ethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, isobutyl vinyl ether, and cyclohexyl vinyl ether
  • esters of an alkyl carboxylic acid and vinyl alcohol such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl valerate, and vinyl cyclohexanecarboxylate
  • alkyl allyl ethers such as ethyl allyl ether, propyl allyl ether, butyl allyl ether, isobutyl allyl ether, and cyclohexyl allyl ether
  • alkyl allyl esters such as ethyl allyl ester, propyl allyl ester, butyl allyl ester, isobutyl allyl ester, and cyclohexyl allyl ester
  • alkenes such as ethylene
  • the above-described monomers are polymerized and are then crosslinked with a dibasic acid to prepare the acrylic-based resin used in the present invention.
  • the same acid curing agents as those used in the epoxy-based resin can be used as this dibasic acid.
  • another resin may be added.
  • the other resin include polyurethane-based resins prepared by curing a hydroxyl-group-containing polyester resin with an isocyanate curing agent, polyester-based resins prepared by curing a carboxyl-group-containing polyester resin with triglycidyl isocyanate or the like, resins prepared by curing a hydroxyl-group-containing polyester resin with an acrylic resin having an isocyanate group in the side chain, and resins prepared by curing a carboxyl-group-containing polyester resin with an acrylic resin having a glycidyl group in the side chain.
  • the average particle diameter of thermosetting resin powder is 100 ⁇ m or less. When a thermosetting resin powder having an average particle diameter of exceeding 100 ⁇ m is used, it is.difficult to coat entire base iron particles or the like with the resin melted by a heat treatment. In such a case, the strength of a compact may not be satisfactorily improved.
  • the average particle diameter of thermosetting resin powder is more preferably 80 ⁇ m or less, particularly 60 ⁇ m or less. Although the lower limit is not particularly limited, the lower limit is generally about 30 ⁇ m. With respect to the "average particle diameter" in the present invention, when a commercially available resin powder is used, the value described in a catalog or the like should be referred to as the average particle diameter.
  • the particle size distribution is measured by a normal particle size distribution analyzer. Subsequently, the particle diameter at the cumulative value of 50% (D 50 ) from the smallest particle diameter is determined from the result and defined as the average particle diameter.
  • the content of resin powder is 0.05% to 1.0% relative to the total amount of an iron powder and/or an iron alloy powder.
  • a resin powder content of less than 0.05% the strength of a green compact cannot be satisfactorily improved and cutting operation prior to the sintering process cannot be performed.
  • a resin powder content exceeding 1.0% the fluidity of a mixed powder is decreased, thus reducing the productivity. In such a case, the density of a green compact is also decreased.
  • Some of the commercially available resin powders include a pigment for the purpose of coloring.
  • a commercially available resin powder including a pigment may be used for the resin powder in the present invention. However, since the pigment may have an adverse effect on the strength of a green compact, a pigment-free resin powder is preferably used.
  • a lubricant may be added to the mixed powder for powder metallurgy of the present invention.
  • the lubricant decreases the coefficient of friction between the green compact and a die, thereby suppressing the generation of die galling and damage of the die.
  • Preferable examples of the lubricant usable in the present invention include ethylenebisstearamide, stearamide, zinc stearate, lithium stearate, and mixtures of at least two of these. These lubricants should be selected according to the intended purpose of the compact when used.
  • the content of the lubricant is 0.05% to 1.0% relative to the total amount of a base iron powder or the like. At a content of less than 0.05%, the lubricity may be insufficient. At a content exceeding 1.0%, the curing of a resin powder may not be satisfactorily performed and the fluidity of mixed powder may be insufficient.
  • the above-described mixed powder for powder metallurgy used by the present invention is molded by a normal method to produce a green compact.
  • a die is filled with the mixed powder and a pressure of 5 to 7 t/cm 2 (490 to 686 MPa) is applied.
  • a heat treatment is performed in order that the thermosetting resin powder is cured to increase the strength of the green compact.
  • the conditions for the heat treatment mainly depend on the type of thermosetting resin powder added, in general, the heat treatment is simply performed at about 150°C to about 200°C for 10 to 30 minutes (more preferably 15 to 20 minutes).
  • a green compact cannot be subjected to a cutting operation prior to sintering because the green compact is brittle.
  • the resultant green compact has a strength of at least 30 MPa measured in accordance with Japan Powder Metallurgy Association (JPMA) Standard M09-1992.
  • JPMA Japan Powder Metallurgy Association
  • the use of the mixed powder for powder metallurgy of the present invention as a feedstock can provide a green compact capable of being subjected to a cutting operation.
  • the green compact obtained by the present invention has an adequate density and strength even prior to the sintering process, the green compact can be subjected to a cutting operation, and in addition, the lifetime of a cutting tool used can be extended.
  • a pure iron powder (trade name: "Atomel 300M", from Kobe Steel, Ltd.) was used as a base metal powder.
  • a commercially available copper powder (2.0 mass percent of the amount of the pure iron powder) (hereinafter, the "mass percent” is simply referred to as "%"), a graphite powder (0.8%), ethylenebisstearamide (0.75%), and a clear powder coating (0.3%) composed of an epoxy-polyester-based resin (Konac No. 2700 from BASF NOF Coatings Co., Ltd., a resin produced by reacting an epoxy resin with a dibasic acid polyester, average particle diameter: 40 ⁇ m) were added to the pure iron powder.
  • the mixture was agitated at a high speed with a mixer with blades.
  • the apparent density of the resultant mixed powder was measured in accordance with Japanese Industrial Standard (JIS) Z2504.
  • the flow rate was also measured in accordance with JIS Z2502.
  • a green compact having a diameter of 11.3 mm and a height of 10 mm was produced at a pressure of 5 t/cm 2 (490.3 MPa) in accordance with Japan Society of Powder and Powder Metallurgy (JSPM) Standard 1-64 (a metal powder compressibility testing method) using the above mixed powder as a feedstock.
  • the green compact was heated at 170°C for 15 minutes. The density of the green compact was then measured. Also, the strength of the green compact was measured in accordance with JPMA M09-1992.
  • a green compact having a diameter of 25 mm and a height of 15 mm was produced at a surface pressure of 490 MPa using the above mixed powder as a feedstock to measure a ejection force, which is an indicator of lubricity.
  • the draw-out pressure was calculated by dividing a load required for drawing out the green compact from the die during molding by the area of contact between the die and the green compact.
  • a mixed powder was produced as in Example 1 except that a clear powder coating composed of an acrylic-based resin (Konac No. 4600 from BASF NOF Coatings Co., Ltd., a resin produced by crosslinking an acrylic resin having a glycidyl group in the side chain with a dibasic acid, average particle diameter: 40 ⁇ m) was used instead of the clear powder coating composed of the epoxy-polyester-based resin used in Example 1. Furthermore, a green compact was produced as in Example 1 except that the green compact was heated at 180°C for 15 minutes. These samples are referred to as No. 2. The apparent density of the mixed powder, the density of the green compact, and the like were measured as in Example 1. Table 1 shows the results.
  • a mixed powder and a green compact made of the mixed powder were produced as in Example 1 except that a clear powder coating composed of an epoxy-based resin (Konac No. 3700 from BASF NOF Coatings Co., Ltd., a resin produced by curing an uncured epoxy resin with an amine curing agent, average particle diameter: 40 ⁇ m) was used as a thermosetting resin powder, and the green compact was heated at 160°C for 15 minutes. These samples are referred to as No. 3. The apparent density of the mixed powder and the like were measured by the same methods. Table 1 shows the results.
  • an epoxy-based resin Konac No. 3700 from BASF NOF Coatings Co., Ltd., a resin produced by curing an uncured epoxy resin with an amine curing agent, average particle diameter: 40 ⁇ m
  • Example 1 Mixed powders and green compacts made of the mixed powders were produced as in Example 1 except that the content of the clear powder coating composed of the epoxy-polyester-based resin (Konac No. 2700 from BASF NOF Coatings Co., Ltd., average particle diameter: 40 ⁇ m) was 1.0% (No. 4) or 0.1% (No. 5).
  • the apparent density of the mixed powders and the like were measured as in Example 1. Table 1 shows the results.
  • mixed powders and green compacts made of the mixed powders were produced as in Example 1 except that the average particle diameter of the clear powder coating composed of the epoxy-polyester-based resin was 150 ⁇ m (No. 9) or 250 ⁇ m (No. 10) instead of 40 ⁇ m.
  • the green compacts composed of a mixed powder in which the average particle diameter of the resin powder exceeded the range in the present invention also showed the same results (Nos. 9 and 10).
  • the green compact had a satisfactory strength, but had a low density. This green compact was also not suited for a cutting operation, and in addition, the mixed powder itself had a low fluidity (No. 8).
  • the mixed powders for powder metallurgy containing a resin powder within the content range specified in the present invention had excellent fluidity, and green compacts made of these mixed powders had an adequate density and strength and thus were suited for a cutting operation.

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Claims (3)

  1. Verfahren zur Herstellung eines Grünkörperkompakts bzw. Grünlings, umfassend das Formen eines Pulvergemisches, umfassend:
    ein Eisenpulver und/oder ein Eisenlegierungspulver,
    eine Komponente zum Verbessern mechanischer Eigenschaften, welche mindestens eine Substanz, ausgewählt aus der Gruppe, bestehend aus Kupfer, Nickel, Chrom, Molybdän, Graphit und Mangansulfid, ist, und
    ein durch Wärme härtendes Harzpulver, wobei das durch Wärme härtende Harzpulver mindestens ein Harz, ausgewählt aus der Gruppe, bestehend aus einem Harz auf Epoxy-Polyester-Basis, einem Harz auf Epoxy-Basis und einem Harz auf Acryl-Basis, umfaßt,
    wobei der durchschnittliche Teilchendurchmesser des durch Wärme härtenden Harzpulvers 100 µm oder weniger beträgt, und wobei der Gehalt des durch Wärme härtenden Harzpulvers, relativ zu der Gesamtmenge des Eisenpulvers und/oder des Eisenlegierungspulvers, 0,05 bis 1,0 Masse-% beträgt, und
    das Härten des geformten Pulvergemisches durch eine Wärmebehandlung.
  2. Verfahren gemäß Anspruch 1, wobei das Pulvergemisch weiter ein Schmiermittel umfaßt.
  3. Verfahren gemäß Anspruch 2, wobei das Schmiermittel mindestens eine Verbindung, ausgewählt aus der Gruppe, bestehend aus Ethylenbisstearamid, Stearamid, Zinkstearat und Lithiumstearat, ist.
EP05020609A 2004-10-28 2005-09-21 Verwendung einer Pulvermischung für Pulvermetallurgie zur Herstellung eines Grünlings Expired - Lifetime EP1652948B1 (de)

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JP2004314381A JP2006124777A (ja) 2004-10-28 2004-10-28 粉末冶金用混合粉末および圧粉成形体

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EP1652948B1 true EP1652948B1 (de) 2007-04-18

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EP (1) EP1652948B1 (de)
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CN (1) CN1765547A (de)
AT (1) ATE360102T1 (de)
CA (1) CA2519413A1 (de)
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JP5663974B2 (ja) * 2009-06-26 2015-02-04 Ｊｆｅスチール株式会社 粉末冶金用鉄基混合粉末
JP2013522441A (ja) * 2010-03-23 2013-06-13 ビーエーエスエフ ソシエタス・ヨーロピア 磁気若しくは磁化成形品を製造するための組成物、及びその組成物の製造方法
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CN102062149B (zh) * 2010-10-18 2012-04-18 浙江长盛滑动轴承股份有限公司 高性能铁基粉末冶金含油自润滑轴承及其生产工艺
JP5552032B2 (ja) 2010-11-22 2014-07-16 株式会社神戸製鋼所 粉末冶金用混合粉末及びその製造方法
CN103551574B (zh) * 2013-10-28 2015-05-27 中南大学 一种含氮的钛基合金的粉末冶金制备方法
CN104325131B (zh) * 2014-10-23 2016-06-29 苏州莱特复合材料有限公司 一种铁基粉末冶金材料及其制备方法
CN104328344A (zh) * 2014-10-23 2015-02-04 苏州莱特复合材料有限公司 一种铁基防锈粉末冶金材料及其制备方法
CN104451335A (zh) * 2014-11-17 2015-03-25 柳州市俊杰汽配制造有限公司 一种汽车用分离轴
JP6380289B2 (ja) * 2015-08-12 2018-08-29 Ｊｆｅスチール株式会社 粉末冶金用鉄基粉末混合物及び粉末冶金用鉄基粉末混合物を用いた成形体の製造方法
JP6489094B2 (ja) * 2015-10-09 2019-03-27 Ｊｆｅスチール株式会社 粉末冶金用混合粉末
JP6477650B2 (ja) * 2015-10-09 2019-03-06 Ｊｆｅスチール株式会社 粉末冶金用混合粉末
JP6655994B2 (ja) * 2016-01-13 2020-03-04 株式会社神戸製鋼所 粉末冶金用混合粉末
JP2020504234A (ja) * 2016-12-23 2020-02-06 フェート・エンフェー （フラームス・インステリング・フーア・テクノロジシュ・オンダーゾエク・エンフェー） 複合ブリケット中の金属リッチな微粉及び粉末コーティング廃棄物材料のリサイクル
CN107893194A (zh) * 2017-10-27 2018-04-10 宁波市鄞州永佳电机工具有限公司 一种高性能扳手
JP2021188072A (ja) * 2020-05-27 2021-12-13 株式会社神戸製鋼所 粉末冶金用鉄基混合物、成形体及び焼結体
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CN1765547A (zh) 2006-05-03
US20080118766A1 (en) 2008-05-22
JP2006124777A (ja) 2006-05-18
DE602005000921D1 (de) 2007-05-31
US20060090594A1 (en) 2006-05-04
CA2519413A1 (en) 2006-04-28
DE602005000921T2 (de) 2007-09-06
EP1652948A1 (de) 2006-05-03
ATE360102T1 (de) 2007-05-15

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