WO2023188576A1 - 摺動部材及び該摺動部材を備える内燃機関 - Google Patents

摺動部材及び該摺動部材を備える内燃機関 Download PDF

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Publication number
WO2023188576A1
WO2023188576A1 PCT/JP2022/045862 JP2022045862W WO2023188576A1 WO 2023188576 A1 WO2023188576 A1 WO 2023188576A1 JP 2022045862 W JP2022045862 W JP 2022045862W WO 2023188576 A1 WO2023188576 A1 WO 2023188576A1
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Prior art keywords
particles
sliding member
hard particles
area
base material
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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PCT/JP2022/045862
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English (en)
French (fr)
Japanese (ja)
Inventor
佳典 伊澤
勝則 乙部
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Fukuda Metal Foil and Powder Co Ltd
Nissan Motor Co Ltd
Original Assignee
Fukuda Metal Foil and Powder Co Ltd
Nissan Motor Co Ltd
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Application filed by Fukuda Metal Foil and Powder Co Ltd, Nissan Motor Co Ltd filed Critical Fukuda Metal Foil and Powder Co Ltd
Priority to US18/848,145 priority Critical patent/US12577643B2/en
Priority to CN202280094189.8A priority patent/CN118871601A/zh
Priority to JP2024511219A priority patent/JP7835851B2/ja
Priority to EP22935705.8A priority patent/EP4502209A4/en
Publication of WO2023188576A1 publication Critical patent/WO2023188576A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/04—Impact or kinetic deposition of particles
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/008—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of engine cylinder parts or of piston parts other than piston rings
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/18—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on silicides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0261—Matrix based on Fe for ODS steels
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
    • C23C24/085—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • F01L3/04—Coated valve members or valve-seats
    • 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]
    • 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
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/121—Use of special materials
    • 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
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
    • B22F2007/042—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal characterised by the layer forming method
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water
    • 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
    • F16C2220/00—Shaping
    • F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy

Definitions

  • the present invention relates to a sliding member, and more particularly, to a sliding member including a particle aggregate in which hard particles are dispersed in a base material particle phase, and an internal combustion engine including the sliding member.
  • components that require wear resistance under high temperatures such as valve seats, generally contain cobalt-based hard particles with a hard phase in the base material particle phase.
  • Patent Document 1 discloses that, as an alternative material to cobalt-based hard particles having a hard phase, hard particles in which a hard phase of molybdenum silicide is dispersed in an iron-based alloy matrix phase in an amount of 3 to 30 area% are used, and a material containing the hard particles is used. It is disclosed that the wear resistance of a sliding member can be improved by using a sintered alloy of mixed powder.
  • Patent Document 1 does not have the same wear resistance as a sliding member using cobalt-based hard particles having a hard phase, and there is room for improvement.
  • the present invention has been made in view of the problems of the prior art, and its purpose is to use cobalt-based hard particles without using cobalt-based hard particles having a hard phase.
  • the object of the present invention is to provide a sliding member having wear resistance equivalent to that of conventional materials.
  • the inventors of the present invention have found that the above object can be achieved by using hard particles of an iron-based alloy containing molybdenum silicide in an amount of 35% by area to 90% by area. , we have completed the present invention.
  • the sliding member of the present invention includes a particle aggregate of base material particles and hard particles on at least the surface thereof.
  • the hard particles are iron-based alloy particles containing molybdenum silicide in an amount of 35% by area to 90% by area.
  • the internal combustion engine of the present invention is characterized by comprising the above-mentioned sliding member.
  • the sliding surface has the same wear resistance as when using cobalt-based hard particles having a hard phase. members can be provided.
  • MoFe 2 is the Laves phase
  • Mo 5.1 Fe 7.9 is the ⁇ phase
  • Mo 0.38 Fe 0.62 is the R phase.
  • the sliding member of the present invention has a particle aggregate of base material particles and hard particles on at least the surface thereof, and the hard particles are iron-based alloy particles containing molybdenum silicide in an area of 35% to 90% by area. It is.
  • a "particle aggregate” refers to particles whose surfaces are partially softened or melted without being completely melted, and where adjacent particles are unified by solidifying and bonding the contact areas with each other.
  • the sliding member of the present invention may be formed entirely of the above-mentioned particle aggregates, or may have a coating film formed of the above-mentioned particle aggregates on the surface of the base material.
  • the above particle aggregate improves the wear resistance of the sliding member by dispersing hard particles in the base material particle group.
  • the hard particles are iron-based alloy particles, and the iron-based alloy particles contain hard molybdenum silicide.
  • the iron-based alloy particles have a molybdenum silicide content of 35 area % or more and 90 area % or less, and because the molybdenum silicide content is high, they exhibit wear resistance equivalent to hard particles containing cobalt. I can do it.
  • the hard particles will not have sufficient hardness, and if it exceeds 90 area%, the silicon (Si) content of the hard particles will increase and the hard particles themselves will be Since the toughness decreases and the material becomes brittle, the wear resistance decreases.
  • the hard particles of the iron-based alloy contain iron (Fe) as a first element, molybdenum (Mo) as a second element, and silicon (Si) as a third element, in order of the elements contained in the largest amount.
  • the content is preferably 2.3% by mass or more and 16% by mass or less.
  • molybdenum silicide tends to precipitate in the hard particles, increasing the hardness of the hard particles, and when the silicon content is 16% by mass or less, the toughness of the hard particles decreases. can be prevented.
  • the above-mentioned molybdenum silicide may contain a Laves phase (Mo(Fe,Si) 2 or Mo(Fe,Si), however, these (Fe,Si) may contain metal elements below the fourth element).
  • the Laves phase is a metastable phase that decomposes at a relatively low temperature of around 900°C, so when exposed to the sliding surfaces of internal combustion engines such as valve seats, it oxidizes and forms molybdenum oxide, which has lubricating properties and is wear resistant. Improve your sexuality.
  • the content of molybdenum silicide in the Laves phase (hereinafter sometimes simply referred to as "Laves phase") of the hard particles is preferably 2.0 area % or more and 90 area % or less, and furthermore, the content of molybdenum silicide in the Laves phase is preferably 2.0 area % or more and 90 area % or less. % or more and 85 area % or less, and preferably 30 area % or more and 80 area % or less.
  • All of the molybdenum silicides in the hard particles may be in the Laves phase, and therefore, the upper limit of the content of the Laves phase in the hard particles is 90 area %.
  • Hard particles containing a Laves phase are produced by melting and homogenizing an iron-based alloy containing iron (Fe) as a main component and containing molybdenum (Mo) and silicon (Si), and then precipitating molybdenum silicide. can be formed.
  • molybdenum silicide forms a ⁇ phase and an R phase in addition to the Laves phase. Since the Laves phase is precipitated at a lower temperature than the ⁇ phase and R phase molybdenum silicide, it is necessary to appropriately adjust the cooling rate in order to form the Laves phase.
  • the iron-based alloy with the above composition is melted and slowly cooled to form a cast piece, which is then pulverized, or water or gas is sprayed onto the molten iron-based alloy to solidify the fine droplets and form particles.
  • it can be formed by a water atomization method or a gas atomization method, it is preferable to produce it by a water atomization method or a gas atomization method.
  • the hard particles obtained by pulverizing the cast pieces of the above-mentioned iron-based alloys form a Laves phase because the cooling rate during the production of the cast pieces is slow, but the precipitates of molybdenum silicide tend to become coarse, so the hard particles obtained by pulverizing The hardness and content of molybdenum silicide tend to vary.
  • the water atomization method and the gas atomization method are generally methods used to rapidly solidify molten metal to confine components dissolved in the matrix metal as solid solutions in the matrix without precipitating. Therefore, the Laves phase is not formed under normal conditions.
  • the pressure of the water or gas sprayed onto the molten metal, the dropping speed of the molten metal, the size of the droplets, etc. are adjusted to make the cooling rate slower than in the normal atomization method.
  • Hard particles with precipitated Laves phase can be formed.
  • molybdenum silicide with a crystallite diameter of 0.1 to 3 ⁇ m is precipitated by cooling at 10 4 to 10 2 K/sec.
  • the mesh of the sieve screen for adjusting the particle size of the hard particles is preferably adjusted to 100 or more and 500 or less.
  • it is desirable that the mesh of the sieve screen is adjusted to 100 or more and 150 or less when the particle aggregate is manufactured using a sintered alloy, which will be described later.
  • the mesh is preferably adjusted to 350 or more and 500 or less.
  • Base material particles particles of metals or alloys that have been conventionally used in parts such as valve seats that require wear resistance under high temperatures can be used, but particles containing copper (Cu) or iron (Fe) as the main component can be used. (50% by mass or more) of copper-based alloy particles and iron-based alloy particles are preferable.
  • a heat transfer path is formed by copper, which has high thermal conductivity, and the thermal conductivity of the particle aggregate increases, improving cooling performance, resulting in improved heat resistance.
  • copper-based alloy particles examples include Cu-Ni-Si alloy particles, Cu-Cr alloy particles, Cu-Zr alloy particles, and Cu-Ti alloy particles, among which Cu-Ni-Si alloy particles Preferably they are particles.
  • nickel In Cu-Ni-Si alloy particles, nickel easily combines with silicon and precipitates, so a structure in which nickel silicide is precipitated in the matrix is formed, precipitation strengthens, and the hardness of the matrix particles themselves increases. , together with the above-mentioned hard particles, can improve wear resistance.
  • iron-based alloy particles Fe--Mo based alloy particles, Fe--Cr based alloy particles, high speed steel such as SKH53, etc. can be used. Further, pure Fe particles can be used which become an Fe--C alloy by diffusing C when mixed with graphite particles and sintered.
  • the copper-based alloy particles and iron-based alloy particles are solid solution particles, when a particle aggregate is formed by cold spraying, which will be described later, the particles will firmly bond to each other and will be precipitation hardened, further improving wear resistance. be able to.
  • the solid solution particles described above can be produced by a water atomization method or a gas atomization method.
  • the average particle diameter (D50) of the base material particles is preferably 20 ⁇ m to 40 ⁇ m.
  • the average particle size of the particles was measured by a laser diffraction/scattering method using MT3000 manufactured by Microtrac Bell Co., Ltd.
  • the above-mentioned sliding member can be produced by coating the base material surface with particle aggregates by spraying raw material particles containing the base material particles and hard particles onto the base material surface without melting, such as by cold spraying or warm spraying, or by coating the base material surface with particle aggregates, or It can be produced by press molding and sintering.
  • the content of hard particles in the raw material particles is 50% by area or less when the raw material particles are press-molded and sintered, and the content of hard particles in the particle aggregate when coating the surface of the base material by cold spraying etc. is 50% by area or less.
  • the content is preferably 20% by area or less.
  • Cold spraying is a method of forming a coating layer of particle aggregates by colliding raw material particles in an unmolten solid state with an inert gas onto a substrate in a supersonic flow without melting or gasifying them.
  • a covering layer can be formed.
  • the base material particles are solid solution particles
  • the base material particles have not yet been precipitation hardened before the solid phase base material particles collide with the base material, so the base material particles are Because it plastically deforms and absorbs the stress of collision, hard particles are prevented from cracking or bouncing back.
  • base material particles solid solution components are precipitated by the energy of collision to form crystallites with a crystallite diameter of 5 to 50 nm, and the base material particles are precipitated and hardened copper-based alloy particles, or Since the particles are iron-based alloy particles, wear resistance is improved.
  • nanocrystals and amorphous are formed near the bonding interface between the base material and the particles and near the bonding interface between the particles.
  • Amorphous particles and crystallites at the interface between particles are analyzed using electron backscatter diffraction (EBSD) using a scanning electron microscope (SEM), which projects a diffraction pattern onto a detector surface and analyzes the crystal orientation from the projected pattern. This can be confirmed by
  • the speed at which the raw material particles containing the base material particles and hard particles are sprayed is preferably 300 to 1200 m/s, more preferably 500 to 1200 m/s.
  • the pressure of the working gas used to spray the raw material particles is preferably 2 to 7 MPa, more preferably 3.5 to 7 MPa. If the pressure of the working gas is less than 2 MPa, the particle velocity may not be obtained and the porosity may increase.
  • the temperature of the working gas is preferably 400 to 1000°C, more preferably 600 to 1000°C, although it depends on the type and particle size of the raw material particles.
  • the temperature of the working gas is less than 400° C., the raw material particles are difficult to plastically deform and the porosity increases, which may reduce wear resistance.
  • the temperature of the working gas exceeds 1000° C., it becomes too close to the melting point of the raw material particles, and the throat portion of the injection nozzle is likely to be clogged.
  • Examples of the above-mentioned working gas include nitrogen gas, helium gas, etc., and these may be used alone or in combination.
  • the thickness of the coating film depends on the temperature and sliding environment where the sliding member is used, but is preferably 0.05 to 5.0 mm, and 0.1 to 1.0 mm, for example. It is more preferable to do so.
  • the strength of the coating film itself will be insufficient, and if the strength of the base material is low, there may be a risk of plastic deformation. Moreover, if it exceeds 5.0 mm, there is a possibility that the coating film will be easily peeled off due to the relationship between the residual stress generated during coating film formation and the interfacial adhesion force.
  • the base material is not particularly limited, and metals conventionally used as sliding members of internal combustion engines can be used, but aluminum alloys have high thermal conductivity and are preferably used.
  • Examples of the above aluminum alloy include AC2A, AC8A, AC4CH, ADC12, etc., which are specified by Japanese Industrial Standards.
  • the sliding member can be formed by press-molding base material particles and hard particles and sintering them at a temperature below the melting points of the base material particles and hard particles.
  • the particle aggregate preferably has a porosity of 20 area % or less, more preferably 4 area % or less, and even more preferably 1 area % or less. By having fewer pores and being dense, the strength of the particle aggregate is improved, and the wear resistance of the sliding member is improved.
  • the porosity of the particle aggregate and the area ratio of base material particles and hard particles can be calculated by binarizing a scanning electron microscope image (SEM image) by image processing and by image analysis.
  • SEM image scanning electron microscope image
  • the above-mentioned sliding member has excellent wear resistance under high temperatures, so it can be used, for example, in sliding members such as valve seats, valve lifters, pistons, piston rings, piston pins, cylinders, crankshafts, camshafts, and connecting rods of internal combustion engines. It can be used suitably.
  • Detector 2-dimensional detector (HyPix3000) After measuring the ratio of each phase using the above method, the Laves phase, ⁇ phase, R phase, other silicides, and parent phase are identified using STEM + EDX and nanodiffraction within a radius of several nanometers, and the ratio of each phase is determined. Obtained.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Ceramic Engineering (AREA)
  • Powder Metallurgy (AREA)
PCT/JP2022/045862 2022-03-28 2022-12-13 摺動部材及び該摺動部材を備える内燃機関 Ceased WO2023188576A1 (ja)

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US18/848,145 US12577643B2 (en) 2022-03-28 2022-12-13 Sliding member and internal combustion engine provided with sliding member
CN202280094189.8A CN118871601A (zh) 2022-03-28 2022-12-13 滑动部件及具备该滑动部件的内燃机
JP2024511219A JP7835851B2 (ja) 2022-03-28 2022-12-13 摺動部材及び該摺動部材を備える内燃機関
EP22935705.8A EP4502209A4 (en) 2022-03-28 2022-12-13 SLIDING ELEMENT AND INTERNAL COMBUSTION ENGINE PROVIDED WITH A SLIDING ELEMENT

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JP2022-051584 2022-03-28

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WO2026062767A1 (ja) * 2024-09-18 2026-03-26 日産自動車株式会社 積層体、これを有する摺動部材、および積層体の製造方法

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JP3852764B2 (ja) 2001-08-06 2006-12-06 日立粉末冶金株式会社 耐摩耗性焼結合金およびその製造方法
JP2008279463A (ja) * 2007-05-08 2008-11-20 Toyota Motor Corp 肉盛耐摩耗鉄基合金
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JP2019085626A (ja) * 2017-11-09 2019-06-06 株式会社豊田中央研究所 肉盛合金および肉盛部材
JP6940801B1 (ja) * 2020-12-25 2021-09-29 千住金属工業株式会社 摺動部材、軸受、摺動部材の製造方法、軸受の製造方法

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JPS49133215A (https=) * 1972-10-19 1974-12-20
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JP3852764B2 (ja) 2001-08-06 2006-12-06 日立粉末冶金株式会社 耐摩耗性焼結合金およびその製造方法
JP2008279463A (ja) * 2007-05-08 2008-11-20 Toyota Motor Corp 肉盛耐摩耗鉄基合金
CN103741049A (zh) * 2014-01-21 2014-04-23 湘潭大学 一种基于Laves相强化的铁基耐磨合金及其制备方法
JP2019085626A (ja) * 2017-11-09 2019-06-06 株式会社豊田中央研究所 肉盛合金および肉盛部材
JP6940801B1 (ja) * 2020-12-25 2021-09-29 千住金属工業株式会社 摺動部材、軸受、摺動部材の製造方法、軸受の製造方法

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WO2026062767A1 (ja) * 2024-09-18 2026-03-26 日産自動車株式会社 積層体、これを有する摺動部材、および積層体の製造方法

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US20250243572A1 (en) 2025-07-31
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JP7835851B2 (ja) 2026-03-25
EP4502209A4 (en) 2025-08-06
US12577643B2 (en) 2026-03-17

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