WO2023145424A1 - 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
WO2023145424A1
WO2023145424A1 PCT/JP2023/000387 JP2023000387W WO2023145424A1 WO 2023145424 A1 WO2023145424 A1 WO 2023145424A1 JP 2023000387 W JP2023000387 W JP 2023000387W WO 2023145424 A1 WO2023145424 A1 WO 2023145424A1
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WIPO (PCT)
Prior art keywords
particles
sliding member
copper
nickel
based alloy
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
Application number
PCT/JP2023/000387
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English (en)
French (fr)
Japanese (ja)
Inventor
佳典 伊澤
勝則 乙部
信一 西村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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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Filing date
Publication date
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 JP2023576749A priority Critical patent/JP7777609B2/ja
Priority to EP23745040.8A priority patent/EP4471180A4/en
Priority to CN202380018306.7A priority patent/CN118591658A/zh
Publication of WO2023145424A1 publication Critical patent/WO2023145424A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • C22C1/0425—Copper-based alloys
    • 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
    • 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
    • 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
    • C23C24/087—Coating with metal alloys or metal elements only
    • 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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • 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
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/122—Multilayer structures of sleeves, washers or liners
    • F16C33/124—Details of overlays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/02—Mechanical properties
    • F16C2202/10—Porosity
    • 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
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/10—Alloys based on copper
    • 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
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/30—Coating surfaces
    • F16C2223/42—Coating surfaces by spraying the coating material, e.g. plasma spraying
    • 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
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines

Definitions

  • the present invention relates to a sliding member, and more particularly to a sliding member that can be suitably used in a high-temperature environment such as an internal combustion engine, and an internal combustion engine equipped with the sliding member.
  • metal particles are sprayed onto the surface of a base material, and the kinetic energy of the metal particles binds the metal particles to the surface of the base material to coat the base material with aggregates of the metal particles, thereby improving the wear resistance of the sliding member. It is known that metal particles are sprayed onto the surface of a base material, and the kinetic energy of the metal particles binds the metal particles to the surface of the base material to coat the base material with aggregates of the metal particles, thereby improving the wear resistance of the sliding member. It is known that metal particles are sprayed onto the surface of a base material, and the kinetic energy of the metal particles binds the metal particles to the surface of the base material to coat the base material with aggregates of the metal particles, thereby improving the wear resistance of the sliding member. It is
  • Patent Document 1 supersaturated solid solution particles are sprayed onto a substrate by a cold spray method, and components exceeding the solid solubility limit are precipitated due to stress and local heat generation due to impact when colliding with the substrate.
  • a sliding member having a coating film formed of a particle aggregate containing hardenable copper alloy particles.
  • the soft supersaturated solid solution particles are sprayed in a solid phase state, so that the solid solution particles before spraying are easily deformed and a dense coating film strongly bonded to the substrate can be formed.
  • the particles bonded to the substrate become hard, precipitation-hardened copper alloy particles, and therefore have high wear resistance.
  • the present invention has been made in view of such problems of the prior art, and aims to provide a sliding member having high hardness and excellent wear resistance at high temperatures and an internal combustion engine equipped with the sliding member. It is to provide institutions.
  • the present inventors have found that by precipitating a precipitate of nickel silicide in a matrix containing copper and nickel, both solid-solution strengthening and precipitation strengthening are achieved. The inventors have found that the effect can be obtained, and have completed the present invention.
  • the sliding member of the present invention has a coating film composed of particle aggregates on the surface of the base material.
  • the particle aggregate contains copper (Cu) as a main component, nickel (Ni) in an amount of 3.5% by mass or more, silicon (Si) in an amount of 0.001% by mass or more, and the composition ratio of Ni to Si. (Ni/Si) containing copper-based alloy particles having 5 or more and 50000 or less,
  • the copper-based alloy particles are characterized by containing precipitates of nickel silicide in a matrix containing at least copper and nickel.
  • an internal combustion engine of the present invention is characterized by comprising the sliding member described above.
  • a precipitate made of nickel silicide is precipitated in a matrix containing copper and nickel, both solid solution strengthening and precipitation strengthening can be obtained, and the hardness at high temperatures is high.
  • a sliding member with improved wear resistance can be provided.
  • FIG. 4 is a schematic enlarged cross-sectional view showing an example of a coating film structure
  • the sliding member of the present invention will be described in detail.
  • the sliding member has a coating film made of aggregates of particles on the surface of the substrate.
  • the particle aggregate contains at least copper-based alloy particles, and may contain other hard particles as necessary.
  • the above-mentioned particle aggregates are formed by locally melting and solidifying the surfaces of the particles, so that the adjacent particles are not blended together as shown in FIG. The whole is integrated to form a coating film layer.
  • the copper-based alloy particles contain copper (Cu) as a main component, nickel (Ni) in an amount of 3.5% by mass or more, silicon (Si) in an amount of 0.001% by mass or more, and the composition ratio of Ni and Si ( Ni/Si) is 5 or more and 50000 or less.
  • a "main component” means a component containing 50 mass % or more.
  • the alloy of copper and nickel is a completely solid-solution type alloy, and solid-solution occurs at an arbitrary composition ratio. Easier to precipitate.
  • Ni/Si nickel and silicon in the copper-based alloy particles
  • the mass ratio (Ni/Si) of nickel and silicon in the copper-based alloy particles is 5 or more and 50000 or less, some nickel precipitates as nickel silicide, but all of the nickel in the alloy precipitates. I have nothing to do.
  • nickel in the above alloy is likely to precipitate as nickel silicide (eg, Ni 2 Si), and the mass ratio (Ni/Si) of this nickel silicide is approximately 106/28, so the copper-based alloy
  • nickel silicide eg, Ni 2 Si
  • Ni/Si nickel silicide
  • the copper-based alloy By containing nickel in the particles at least five times as much as silicon, even if nickel is precipitated as nickel silicide, nickel always remains in the matrix phase.
  • the copper-based alloy particles contain copper and nickel in the matrix, and atoms of different atomic sizes form a solid solution.
  • the melting point is higher than that of pure copper, so the strength at high temperatures is improved.
  • the copper-based alloy particles are precipitation-strengthened alloys having strain at the crystallite level due to the nickel silicide precipitated in the matrix. Since the entire base alloy grain has strain, there is no portion with low strength.
  • the copper-based alloy particles can obtain the strengthening effects of both solid-solution strengthening and precipitation strengthening, so that the strength at high temperatures is improved and the wear resistance is improved.
  • the mass ratio of Ni and Si (Ni/Si) in the copper-based alloy particles is preferably 7 or more and 100 or less.
  • the copper-based alloy particles preferably contain 0.002% by mass or more of silicon, and more preferably 0.5% by mass or more and 1.3% by mass or less.
  • the silicon content is 0.002% by mass or more, the amount of nickel silicide precipitated increases, so the precipitation strengthening effect increases. If the silicon content exceeds 1.3% by mass, the hardness of the raw material particles may become too high when forming a coating film by a cold spray method, which will be described later, and the conditions for film formation may become severe.
  • the copper-based alloy particles preferably have a nickel content of 10% by mass or more and 35% by mass or less. As the nickel content increases, the strength of the copper-based alloy particles increases, but the hardness of the matrix phase increases due to solid solution strengthening, and when forming a coating film by the cold spray method, the hardness of the raw material particles becomes too high. Therefore, the film formation conditions may become severe.
  • the sliding member of the present invention when the sliding member of the present invention is applied to a valve seat of an internal combustion engine and the mating material is steel or a nickel-based alloy containing nickel, such as an exhaust valve, the nickel content is 25% by mass or less.
  • a valve/valve seat and its members are a sliding mechanism and a sliding member, and are also a valve mechanism and a valve member. It is described as a sliding member.
  • the particle aggregate preferably contains hard particles in addition to the copper-based alloy particles.
  • the hard particles By containing the hard particles, displacement between the copper-based alloy particles due to stress is suppressed, the strength of the coating film as a whole is improved, and wear resistance is improved.
  • hard particles examples include iron (Fe)-based alloys, cobalt (Co)-based alloys, molybdenum (Mo)-based alloys, chromium (Cr)-based alloys, nickel (Ni)-based alloys, and ceramics having a Vickers hardness of 700 Hv to 1500 Hv. The following particles may be mentioned.
  • hard particles such as TRIBALOY (registered trademark) T-400, Stellite (registered trademark), and TRIBALOY (registered trademark) T-700.
  • the sliding member can be produced by spraying raw material particles onto the surface of the base material by a cold spray method to form a coating film of particle aggregates.
  • the raw material particles to be the copper-based alloy particles solid solution particles of a copper-based alloy in which silicon is dissolved in a matrix containing copper and nickel can be used, and if necessary, the solid solution particles are mixed with the hard particles. can be used as
  • Cold spray is a method of forming a coating film by colliding raw material particles in a solid state with a supersonic flow together with an inert gas without melting or gasifying them. Unlike the method of forming a coating film by melting, it is possible to minimize changes in the properties of metal particles and oxidation in the coating film due to heat.
  • the raw material particles in a solid state collide with the base material by the cold spray, the raw material particles themselves undergo plastic deformation, part of the kinetic energy is converted into thermal energy, and the surfaces of the raw material particles are locally melted and solidified. As a result, the raw material particles are bonded to each other to form a particle aggregate to form a coating film.
  • the raw material particles used for cold spraying are not the solid solution particles but the particles in which nickel silicide is precipitated in advance, the raw material particles are already precipitation-strengthened, so even if they collide with the base material or other particles, plastic deformation It becomes difficult to form a coating film because it cannot absorb the stress of collision and tends to crack or rebound.
  • the raw material particles are the above-mentioned solid solution particles, they are not yet precipitation-strengthened, so they are soft and plastically deformed by collision, so that it is possible to form a coating film of particle aggregates in which the particles are bonded to each other.
  • a coating film of aggregates can be formed.
  • the content of hard particles in the raw material particles is preferably 50% by mass or less, and the content of hard particles in the coating film is preferably 20% by area or less.
  • nanocrystals and amorphous are formed in the vicinity of the bonding interface between the base material and the particles and in the vicinity of the bonding interface between particles.
  • the silicon dissolved in the solid solution particles precipitates as nickel silicide together with nickel due to the collision energy, forming crystallites with an average particle size of 5 to 50 nm.
  • the solid solution particles become precipitation hardening copper-based alloy particles due to the precipitates of nickel silicide, and the inner portion of the copper-based alloy particles close to the outer shell is deformed by plastic deformation due to collision, resulting in an average grain size of is refined into crystallites of 5 ⁇ m or less, so the strength is improved.
  • the solid solution particles of the present invention have a high nickel content and are solid solution strengthened, they are less likely to be plastically deformed than solid solution particles with a low nickel content. Therefore, it is necessary to sufficiently accelerate the solid solution particles by reducing the supply amount of the solid solution particles and increase the kinetic energy possessed by one solid solution particle when cold spraying the base material.
  • the solid solution particles can be produced by a water atomization method or a gas atomization method. Specifically, it can be produced by flowing down the molten metal having the composition described above, spraying high-pressure water or gas onto the molten metal to atomize the molten metal, and rapidly cooling and solidifying it to form particles.
  • the average diameter (D50) of the solid solution particles is preferably 20 ⁇ m to 40 ⁇ m.
  • a dense coating film can be formed by reducing the average particle size of the solid solution particles. There is a possibility that the strength of the coating film is likely to be reduced due to a decrease in adhesion to the body.
  • the coating film preferably has a porosity of 4 area % or less, preferably 1 area % or less. Since the solid solution particles are sufficiently plastically deformed to be dense with few pores, the strength of the coating film is improved and the abrasion resistance is improved.
  • the porosity of the coating film and the average particle size of the copper-based alloy particles are obtained by scanning electron microscope images (SEM images). It can be binarized by processing and calculated by image analysis.
  • the cross section of the coating film was photographed as a composition image of SEM in 5 fields of view in an image field range of 350 ⁇ m in width ⁇ 263 ⁇ m in height, binarized with an image processing device, and the porosity was calculated. . Also, the area ratio of the hard particles was calculated from the same image, and the area ratio of the copper-based alloy was obtained as the remainder.
  • the amorphous and crystallites at the interfaces between the copper-based alloy particles are projected on the detector surface by electron beam backscatter diffraction (EBSD) using a scanning electron microscope (SEM), and from the projected pattern It can be confirmed by analyzing the crystal orientation.
  • EBSD electron beam backscatter diffraction
  • SEM scanning electron microscope
  • the speed at which the raw material particles are sprayed is preferably 300 to 1200 m/s, more preferably 500 to 1200 m/s.
  • the pressure of the working gas for spraying 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.degree. C., more preferably 600 to 1000.degree. If the temperature of the working gas is less than 400° C., the raw material particles are less likely to be plastically deformed and the porosity increases, resulting in a decrease in wear resistance. On the other hand, when 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.
  • working gas examples include nitrogen gas and helium gas, and these may be used singly or in combination.
  • the thickness of the coating film depends on the temperature and sliding environment of the place where the sliding member is used, but is preferably 0.05 to 5.0 mm, for example, 0.1 to 0.5 mm. is more preferable.
  • the thickness is less than 0.05 mm, the strength of the coating film itself is insufficient, and plastic deformation may occur when the strength of the substrate is low. On the other hand, if it exceeds 5.0 mm, there is a possibility that the coating film may be easily peeled off due to the relationship between the residual stress generated during coating film formation and the interfacial adhesive strength.
  • the base material is not particularly limited, and metals conventionally used as sliding members of internal combustion engines can be used, but aluminum alloys are preferably used because of their high thermal conductivity.
  • Examples of the above aluminum alloys include A5056, A1050, AC2A, AC8A, ADC12, etc. specified by Japanese Industrial Standards.
  • the sliding member Since the sliding member has excellent wear resistance under high temperature, it can be used, for example, in internal combustion engine valve seats, valve lifters, pistons, piston rings, piston pins, cylinders, crankshafts, camshafts, connecting rods, metals thereof, and the like. It can be suitably used for sliding members.
  • Example 1 An aluminum base material (A5056) was mounted on a turntable, and solid solution particles (Cu-3.5Ni-0.5Si, average particle diameter (D50): 31.5 ⁇ m, prepared by water atomization while rotating the turntable. , TRIBALOY (registered trademark) T-400 and raw material particles mixed at 50:50 are cold sprayed under the following conditions to form a coating film layer of 0.8 to 1.0 mm, and finished with a lathe. to a film thickness of 0.4-0.5 mm.
  • High-pressure cold spray device PCS-1000 manufactured by Plasma Giken Kogyo Co., Ltd.
  • Working gas Nitrogen Working gas temperature: 600°C
  • Working gas pressure 4 MPa
  • Spray distance 20mm
  • Base material rotation speed 300 rpm
  • Particle supply amount about 7 g/min Others: During construction, the gun was fixed and the powder was supplied until a predetermined film thickness was obtained (after the temperature was raised outside the construction site, the gun was driven to the construction site at 100 mm/sec, and the powder was supplied with the gun fixed. After the required film thickness is obtained, the powder supply is terminated, and the gun is driven outside the construction site at 100 mm/sec to complete the construction.)
  • Coating films of Examples 2 to 8 and Comparative Examples 1 to 4 were formed under the conditions shown in Table 1 below, and the coating films of Examples and Comparative Examples were evaluated under the following conditions. Table 1 also shows the coating film formation conditions and evaluation results.
  • a comparison between Examples 2 to 6 and Comparative Example 1 shows that the coating film of the present invention has high hardness at high temperatures and excellent wear resistance.
  • Example 4 when the mating material contains nickel, the wear resistance of Example 4, in which the nickel content of the copper-based alloy particles exceeds 25% by mass, is lowered. From this, it can be seen that adhesive wear occurs.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
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  • Other Surface Treatments For Metallic Materials (AREA)
PCT/JP2023/000387 2022-01-26 2023-01-11 摺動部材及び該摺動部材を備える内燃機関 Ceased WO2023145424A1 (ja)

Priority Applications (3)

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JP2023576749A JP7777609B2 (ja) 2022-01-26 2023-01-11 摺動部材及び該摺動部材を備える内燃機関
EP23745040.8A EP4471180A4 (en) 2022-01-26 2023-01-11 Sliding member and internal-combustion engine equipped with sliding member
CN202380018306.7A CN118591658A (zh) 2022-01-26 2023-01-11 滑动部件及具备该滑动部件的内燃机

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CN118591658A (zh) 2024-09-03
EP4471180A4 (en) 2025-05-28

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