WO2022044950A1 - 摺動部材 - Google Patents
摺動部材 Download PDFInfo
- Publication number
- WO2022044950A1 WO2022044950A1 PCT/JP2021/030359 JP2021030359W WO2022044950A1 WO 2022044950 A1 WO2022044950 A1 WO 2022044950A1 JP 2021030359 W JP2021030359 W JP 2021030359W WO 2022044950 A1 WO2022044950 A1 WO 2022044950A1
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- WIPO (PCT)
- Prior art keywords
- pore
- dense portion
- sliding member
- pores
- sliding
- Prior art date
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- 239000011148 porous material Substances 0.000 claims abstract description 30
- 239000000919 ceramic Substances 0.000 claims abstract description 7
- 239000011800 void material Substances 0.000 claims description 15
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 10
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 8
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000008187 granular material Substances 0.000 description 18
- 239000000314 lubricant Substances 0.000 description 15
- 229920001187 thermosetting polymer Polymers 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 1
- 239000011225 non-oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- 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
- F16C33/24—Brasses; Bushes; Linings with different areas of the sliding surface consisting of different materials
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
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- C04B35/62695—Granulation or pelletising
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0051—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
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- C04B38/0645—Burnable, meltable, sublimable materials
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/043—Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00344—Materials with friction-reduced moving parts, e.g. ceramics lubricated by impregnation with carbon
- C04B2111/00353—Sliding parts
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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- C04B2235/36—Glass starting materials for making ceramics, e.g. silica glass
- C04B2235/365—Borosilicate glass
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- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
- C04B2235/483—Si-containing organic compounds, e.g. silicone resins, (poly)silanes, (poly)siloxanes or (poly)silazanes
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F16C2202/02—Mechanical properties
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- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
- F16C2206/40—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal
- F16C2206/56—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal based on ceramic carbides, e.g. silicon carbide (SiC)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F16C2220/00—Shaping
- F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/44—Hole or pocket sizes
Definitions
- the disclosed embodiment relates to a sliding member.
- One aspect of the embodiment is to provide a sliding member capable of maintaining good slidability for a long period of time.
- the sliding member according to one embodiment has a pore-dense portion in which a plurality of pores are densely packed on the sliding surface of the main body portion made of ceramic.
- FIG. 1 is a perspective view of a sliding member according to an embodiment.
- FIG. 2 is a diagram showing an SEM observation photograph of a sliding surface according to an embodiment.
- FIG. 3 is a diagram showing an SEM observation photograph of the sliding surface according to the embodiment.
- FIG. 4 is a diagram showing an SEM observation photograph of the sliding surface according to the embodiment.
- FIG. 5 is a diagram showing an SEM observation photograph of the sliding surface according to the embodiment.
- FIG. 6 is a diagram showing an SEM observation photograph of the sliding surface according to the embodiment.
- FIG. 7 is a diagram showing an example of the configuration of the pore-dense portion according to the embodiment.
- FIG. 8 is a diagram showing an example of the configuration of the pore-dense portion according to the embodiment.
- FIG. 1 is a plan view of the sliding member 1 according to the embodiment.
- the sliding member 1 according to the embodiment includes a main body portion 2 made of ceramic.
- the main body 2 has a sliding surface 3.
- This sliding surface 3 is a mirror-finished surface and slides with other members (not shown).
- the main body 2 is, for example, ring-shaped, and both main surfaces are sliding surfaces 3.
- the sliding member 1 can be used for, for example, a bearing, a faucet valve, a tool in drilling, a saw blade, a pulley, a gear, a threaded joint, a bearing, a seal ring, a guide member, and the like.
- the ceramics constituting the main body 2 include oxide ceramics such as alumina (Al 2 O 3 ), zirconia (ZrO 2 ) and spinel (Mg Al 2 O 4 ), or silicon carbide (SiC) and silicon nitride (Si 3 ). N 4 ), non-oxide ceramics such as aluminum nitride (AlN), titanium nitride (TiN), and titanium carbide (TiC) can be mentioned.
- the main body 2 contains silicon carbide, silicon nitride or alumina as a main component.
- the main body 2 contains silicon carbide as a main component.
- the thermal conductivity of the main body 2 can be improved, so that the frictional heat generated when sliding with other members can be efficiently dissipated.
- FIG. 2 to 6 are views showing SEM observation photographs of the sliding surface 3 according to the embodiment.
- the dark-colored portion is a portion where no substance is present on the surface.
- the sliding surface 3 of the sliding member 1 according to the embodiment has a pore-dense portion 4 in which pores 10 (see FIG. 7) are densely packed.
- the number of pores 10 included in one pore-dense portion 4 is, for example, 40 (pieces) or more and 1000 (pieces) or less, and particularly preferably 100 (pieces) or more and 500 (pieces) or less.
- the size of the pore-dense portion 4 is 25 ( ⁇ m) or more and 300 ( ⁇ m) or less, and particularly 30 ( ⁇ m) or more and 150 ( ⁇ m) or less when observed in the cross-sectional visual field. It is preferable to have.
- the area of the pore-dense portion 4 is 450 ( ⁇ m 2 ) or more and 75,000 ( ⁇ m 2 ) or less, and particularly 600 ( ⁇ m 2 ) or more and 20000 ( ⁇ m 2 ) when observed in the cross-sectional visual field. ) The following is preferable.
- the size of the pores 10 that are densely packed in the pore-dense portion 4 is, for example, 0.5 ( ⁇ m) or more and 10 ( ⁇ m) or less.
- the lubricant can be held in a large number of pores 10 in the pore-dense portion 4.
- the lubricant held in the pore-dense portion 4 can be supplied to the sliding surface 3.
- the sliding member 1 that can maintain good slidability for a long period of time.
- a plurality of pores 10 are spherically densely packed in the pore-dense portion 4 according to the embodiment.
- the frictional force generated when sliding with other members can be dispersed, so that uneven wear can be less likely to occur on the sliding surface 3.
- the sliding member 1 that can maintain good slidability for a longer period of time.
- the spherically dense pore-dense portion 4 and the pore-dense portion 4 densely packed in a shape different from the spherical shape may be mixed on the sliding surface 3, and are densely packed in a shape different from the spherical shape. Only the pore-dense portion 4 may be present on the sliding surface 3.
- the sliding surface 3 may have a pore-dense portion 4 and a void 5 located around the pore-dense portion 4.
- the void 5 is located along the contour of the pore-dense portion 4, and is, for example, larger than the pore 10 (see FIG. 7) in the pore-dense portion 4 and has an acute angle at the end.
- the sliding surface 3 of the sliding member 1 has the void 5 in addition to the pore-dense portion 4, the lubricant can be held in the void 5.
- the lubricant held in the pore-dense portion 4 and the void 5 can be supplied to the sliding surface 3.
- the sliding member 1 that can maintain good slidability for a longer period of time.
- the void 5 according to the embodiment is preferably larger than the pores 10 in the pore-dense portion 4.
- the length of the void 5 along the contour of the pore-dense portion 4 is, for example, 20 ( ⁇ m) or more and 60 ( ⁇ m) or less.
- the length of the void 5 may be less than 20 ( ⁇ m) or longer than 60 ( ⁇ m).
- the lubricant held in the large voids 5 can be sequentially supplied to the small pores 10 in the pore-dense portion 4. Therefore, according to the embodiment, it is possible to realize the sliding member 1 that can maintain good slidability for a longer period of time.
- the void 5 according to the embodiment may have a shape having an acute angle at the end. This makes it easier to hold the lubricant in the void 5.
- the sliding member 1 that can maintain good slidability for a longer period of time.
- the inner diameter of the pore 10 located in the pore-dense portion 4 on the sliding surface 3 is larger than the inner diameter of the pore 10 located in the main body portion 2 other than the pore-dense portion 4.
- the inner diameter of the pore 10 located in the pore-dense portion 4 is about 0.8 ( ⁇ m) to 5.0 ( ⁇ m)
- the inner diameter of the pore 10 located in the main body portion 2 other than the pore-dense portion 4 is about 0.8 ( ⁇ m) to 5.0 ( ⁇ m). It is preferably about 0.5 ( ⁇ m) to 2.0 ( ⁇ m).
- the total volume of the pores 10 in the pore-dense portion 4 can be increased, so that more lubricant can be retained in the pore-dense portion 4. Therefore, when the sliding member 1 slides with other members, more lubricant held in the pore-dense portion 4 can be supplied to the sliding surface 3.
- the sliding member 1 that can maintain good slidability for a longer period of time.
- the porosity of the pore-dense portion 4 is preferably in the range of 5 (%) to 15 (%). If the porosity of the pore-dense portion 4 is less than 5 (%), the amount of the lubricant retained is small, so that the period during which good slidability can be maintained is shortened. Further, when the porosity of the pore-dense portion 4 is larger than 15 (%), the strength of the pore-dense portion 4 is lowered, so that the main body portion 2 is likely to be threshed when other members slide. It ends up.
- the porosity of the pore-dense portion 4 in the range of 5 (%) to 15 (%), good slidability can be maintained for a long period of time and threshing of the main body portion 2 is suppressed. can do.
- the porosity of the pore-dense portion 4 may be in the range of 1.5 to 5 times the porosity of the main body portion 2 other than the pore-dense portion 4. Thereby, the porosity of the pore-dense portion 4 can be easily set in the range of 5 (%) to 15 (%).
- FIGS. 7 and 8 are views showing an example of the configuration of the pore-dense portion 4 according to the embodiment.
- the presence of the pores 10 communicating with the pore-dense portion 4 makes it possible to increase the overall volume of the pores 10 in the pore-dense portion 4, so that the pore-dense portion 4 retains more lubricant. be able to.
- the contact area with the lubricant can be increased, so that the holding power of the lubricant in the pore-dense portion 4 can be enhanced.
- the lubricant can be held in the pores 10 communicated in the depth direction, so that the amount of the lubricant retained. Can be further increased, and the holding power of the lubricant can be further improved.
- the sliding member 1 that can maintain good slidability for a longer period of time.
- a powder of silicon carbide as a main component and a powder of a sintering aid for example, alumina, yttrium oxide (Y2O3) , boron carbide ( B4C), etc.
- a sintering aid for example, alumina, yttrium oxide ( Y2O3) , boron carbide ( B4C), etc.
- the silicon carbide powder and the sintering aid powder are mixed at a predetermined ratio, water and a dispersant are added, and the mixture is mixed for a predetermined time with a ball mill, a bead mill, or the like to obtain a primary slurry.
- an organic binder is added to the obtained primary slurry and mixed to obtain a secondary slurry. Then, the obtained secondary slurry is spray-dried to obtain granules whose main component is silicon carbide.
- spray-drying conditions are appropriately set so that granules having a size of 30 ( ⁇ m) or more and 120 ( ⁇ m) or less occupy 70 (% by volume) or more of the whole granules. do.
- a part of the obtained granules is subjected to a treatment of containing a thermosetting resin, and further heat-treated at a temperature of about 100 (° C.) to 200 (° C.) to thermally cure the granules. do.
- thermosetting resin contained in the granules is, for example, a phenol resin, a urea resin, a melamine resin, a silicon resin, or the like, of which a phenol resin is preferable.
- the amount of the thermosetting resin contained in the granules is, for example, 0.1 (% by weight) or more and 40 (% by weight) or less, and particularly 1 (% by weight) or more and 7 (% by weight) or less. Is preferable.
- the non-thermosetting granules and the thermosetting granules are mixed at a predetermined ratio, filled in a predetermined molding mold, and press-molded into a ring shape at an appropriately set pressure.
- the non-thermosetting granules are crushed by pressure and the voids that are dense inside the granules are also crushed, whereas the thermosetting granules are not crushed by pressure and are densely packed inside the granules. Many voids remain inside the molding.
- the obtained molded product is fired in an argon atmosphere.
- silicon nitride When silicon nitride is used as the main component, it may be fired in a nitrogen atmosphere, and when alumina is used as the main component, it may be fired in an air atmosphere.
- the temperature is held at a temperature 50 ° C to 100 ° C lower than the predetermined sintering temperature for 2 to 10 hours.
- it is kept at a predetermined sintering temperature for 1 to 10 hours and then cooled to room temperature to obtain a fired body.
- the pore-dense portion 4 is formed inside the fired body by firing with a large number of voids that are densely packed inside the thermosetting granules remaining. Further, due to the difference in hardness and heat shrinkage between the heat-cured granules and the non-heat-cured granules, the pore-dense portion 4 (that is, the heat-cured portion 4) was heat-cured when the sintered body was cooled. A void 5 is formed around the granule).
- the obtained fired body is subjected to polishing treatment such as mirror finishing.
- polishing treatment such as mirror finishing.
- the present disclosure is not limited to the above embodiments, and various changes can be made as long as the purpose is not deviated.
- the ring-shaped sliding member 1 is shown, but the shape of the sliding member 1 is not limited to the ring shape, and the technique of the present disclosure is applied to the sliding member 1 having various shapes. Can be done.
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Abstract
摺動部材(1)は、セラミックで構成される本体部(2)の摺動面(3)に、複数の気孔(10)が密集した気孔密集部(4)を有する。
Description
開示の実施形態は、摺動部材に関する。
従来、炭化珪素などのセラミックで構成される摺動部材が知られている(例えば、特許文献1参照)。
実施形態の一態様は、長期間にわたって良好な摺動性を維持できる摺動部材を提供することを目的とする。
実施形態の一態様に係る摺動部材は、セラミックで構成される本体部の摺動面に、複数の気孔が密集した気孔密集部を有する。
以下、添付図面を参照して、本願の開示する摺動部材の実施形態について説明する。なお、以下に示す実施形態によりこの発明が限定されるものではない。
従来、炭化珪素などのセラミックで構成される摺動部材が知られている。しかしながら、上記の従来技術では、長期間にわたって摺動性を良好に維持する点について改善の余地があった。
そこで、上述の問題点を克服し、摺動部材において長期間にわたって摺動性を良好に維持することができる技術の実現が期待されている。
図1は、実施形態に係る摺動部材1の平面図である。図1に示すように、実施形態に係る摺動部材1は、セラミックで構成される本体部2を備える。かかる本体部2は、摺動面3を有する。
この摺動面3は、鏡面加工された面であり、図示しない他の部材と摺動する。本開示において、本体部2はたとえばリング状であり、両方の主面が摺動面3となっている。
実施形態に係る摺動部材1は、たとえば、軸受、フォーセットバルブ、ドリル加工における工具、鋸刃、滑車、ギヤ、ねじ継手、ベアリング、シールリングおよびガイド部材などに用いることができる。
本体部2を構成するセラミックとしては、アルミナ(Al2O3)、ジルコニア(ZrO2)、スピネル(MgAl2O4)などの酸化物セラミックス、または、炭化珪素(SiC)、窒化珪素(Si3N4)、窒化アルミ(AlN)、窒化チタン(TiN)、炭化チタン(TiC)などの非酸化物セラミックスなどが挙げられる。
この中でも摺動面3の摺動性を向上させるという観点から、本体部2は、炭化珪素、窒化珪素またはアルミナを主成分としていることが好ましい。
また、実施形態では、本体部2が炭化珪素を主成分としているとさらによい。これにより、本体部2の熱伝導率を向上させることができることから、他の部材と摺動する際に発生する摩擦熱を効率よく放熱することができる。
図2~図6は、実施形態に係る摺動面3のSEM観察写真を示す図である。なお、以下に示すSEM観察写真では、濃色の部位が表面に物質の存在しない部位である。実施形態に係る摺動部材1の摺動面3は、図2などに示すように、気孔(pore)10(図7参照)が密集した気孔密集部4を有する。
1つの気孔密集部4に含まれる気孔10の個数は、たとえば、40(個)以上かつ1000(個)以下であり、特に、100(個)以上かつ500(個)以下であることが好ましい。
また、気孔密集部4の大きさは、たとえば、断面視野に観察される場合で、25(μm)以上かつ300(μm)以下であり、特に、30(μm)以上かつ150(μm)以下であることが好ましい。
また、気孔密集部4の面積は、たとえば、断面視野に観察される場合で、450(μm2)以上かつ75000(μm2)以下であり、特に、600(μm2)以上かつ20000(μm2)以下であることが好ましい。
また、気孔密集部4に密集する気孔10の大きさは、たとえば、0.5(μm)以上かつ10(μm)以下である。
ここで、実施形態では、摺動面3が気孔密集部4を有することにより、かかる気孔密集部4内の数多くの気孔10に潤滑剤を保持させることができる。これにより、摺動部材1が他の部材と摺動する際に、気孔密集部4に保持された潤滑剤を摺動面3に供給することができる。
したがって、実施形態によれば、長期間にわたって良好な摺動性を維持できる摺動部材1を実現することができる。
また、実施形態に係る気孔密集部4には、図3などに示すように、複数の気孔10(図7参照)が球状に密集しているとよい。これにより、他の部材と摺動する際に発生する摩擦力を分散させることができることから、摺動面3で偏摩耗を生じにくくすることができる。
したがって、実施形態によれば、さらに長期間にわたって良好な摺動性を維持できる摺動部材1を実現することができる。なお、実施形態では、球状に密集した気孔密集部4と、球状とは異なる形状に密集した気孔密集部4とが摺動面3に混在していてもよく、球状とは異なる形状に密集した気孔密集部4のみが摺動面3に存在していてもよい。
また、実施形態では、図5などに示すように、摺動面3が、気孔密集部4と、かかる気孔密集部4の周囲に位置する空隙(void)5とを有してもよい。かかる空隙5は、気孔密集部4の輪郭に沿って位置しており、たとえば、気孔密集部4内の気孔10(図7参照)よりも大きく、かつ端部に鋭角を有する形状である。
このように、摺動部材1の摺動面3が気孔密集部4に加えて空隙5も有することで、かかる空隙5にも潤滑剤を保持させることができる。これにより、摺動部材1が他の部材と摺動する際に、気孔密集部4および空隙5に保持された潤滑剤を摺動面3に供給することができる。
したがって、実施形態によれば、さらに長期間にわたって良好な摺動性を維持できる摺動部材1を実現することができる。
また、実施形態にかかる空隙5は、気孔密集部4内の気孔10よりも大きいとよい。気孔密集部4の輪郭に沿った空隙5の長さは、たとえば、20(μm)以上かつ60(μm)以下である。なお、空隙5の長さは、20(μm)未満でもよいし、60(μm)よりも長くてもよい。
これにより、大きな空隙5に保持された潤滑剤を気孔密集部4内の小さな気孔10に順次供給することができる。したがって、実施形態によれば、さらに長期間にわたって良好な摺動性を維持できる摺動部材1を実現することができる。
また、実施形態にかかる空隙5は、端部に鋭角を有する形状であるとよい。これにより、空隙5で潤滑剤をさらに保持しやすくすることができる。
したがって、実施形態によれば、さらに長期間にわたって良好な摺動性を維持できる摺動部材1を実現することができる。
また、実施形態では、摺動面3において気孔密集部4に位置する気孔10の内径が、気孔密集部4以外の本体部2に位置する気孔10の内径よりも大きいとよい。たとえば、気孔密集部4に位置する気孔10の内径は、0.8(μm)~5.0(μm)程度であり、気孔密集部4以外の本体部2に位置する気孔10の内径は、0.5(μm)~2.0(μm)程度であるとよい。
これにより、気孔密集部4における気孔10の全体の容積を大きくすることができるため、気孔密集部4により多くの潤滑剤を保持させることができる。そのため、摺動部材1が他の部材と摺動する際に、気孔密集部4に保持されたより多くの潤滑剤を摺動面3に供給することができる。
したがって、実施形態によれば、さらに長期間にわたって良好な摺動性を維持できる摺動部材1を実現することができる。
また、実施形態では、気孔密集部4の気孔率が5(%)~15(%)の範囲であるとよい。仮に気孔密集部4の気孔率が5(%)未満である場合、潤滑剤の保持量が少なくなることから、良好な摺動性を維持可能な期間が短くなってしまう。また、気孔密集部4の気孔率が15(%)よりも大きい場合、気孔密集部4の強度が低下してしまうため、他の部材が摺動する際に本体部2が脱粒しやすくなってしまう。
しかしながら、実施形態では、気孔密集部4の気孔率を5(%)~15(%)の範囲にすることで、長期間にわたって良好な摺動性を維持できるとともに、本体部2の脱粒を抑制することができる。
また、実施形態では、気孔密集部4の気孔率が、気孔密集部4以外の本体部2の気孔率の1.5倍~5倍の範囲であるとよい。これにより、気孔密集部4の気孔率を5(%)~15(%)の範囲に容易に設定することができる。
また、実施形態では、図7および図8に示すように、気孔密集部4内に連通した気孔10が存在しているとよい。図7および図8は、実施形態に係る気孔密集部4の構成の一例を示す図である。
このように、気孔密集部4に連通した気孔10が存在することで、気孔密集部4における気孔10の全体の容積が大きくすることができるため、気孔密集部4により多くの潤滑剤を保持させることができる。
また、多数の気孔10や大小の気孔10が互いに連通することで、潤滑剤との接触面積を増加させることができることから、気孔密集部4における潤滑剤の保持力を高めることができる。
さらには、図8に示すように、深さ方向にも複数の気孔10同士が連通していることで、深さ方向に連通した気孔10内に潤滑剤を保持できるため、潤滑剤の保持量をさらに増加させることができるとともに、潤滑剤の保持力をさらに向上させることができる。
したがって、実施形態によれば、さらに長期間にわたって良好な摺動性を維持できる摺動部材1を実現することができる。
つづいて、実施形態に係る摺動部材1における製造工程の概要について説明する。なお、以下の説明では、炭化珪素を主成分とする摺動部材1について示すが、本開示は以下の例に限定されるものではない。
まず、主成分である炭化珪素の粉末と、焼結助剤(たとえば、アルミナや酸化イットリウム(Y2O3)、炭化ホウ素(B4C)など)の粉末とを準備する。そして、炭化珪素の粉末および焼結助剤の粉末を所定の割合で混合し、水および分散剤を加えて、ボールミルやビーズミルなどにより所定時間混合して1次スラリーとする。
次に、得られた1次スラリーに有機バインダを添加して混合し、2次スラリーとする。そして、得られた2次スラリーを噴霧乾燥(スプレードライ)することで、主成分が炭化珪素である顆粒を得る。
なお、かかる顆粒を得る際には、大きさが30(μm)以上かつ120(μm)以下の顆粒が、顆粒全体のうち70(体積%)以上を占めるように、噴霧乾燥の条件を適宜設定する。
次に、得られた顆粒の一部に対して、熱硬化性樹脂を含有させる処理を行い、さらに100(℃)~200(℃)程度の温度で熱処理を施すことにより、かかる顆粒を熱硬化する。
なお、顆粒に含有させる熱硬化性樹脂は、たとえば、フェノール樹脂、ユリア樹脂、メラミン樹脂、またはシリコン樹脂などであり、このうち、フェノール樹脂が好ましい。また、顆粒に含有させる熱硬化樹脂の量は、たとえば、0.1(重量%)以上かつ40(重量%)以下であり、特に、1(重量%)以上7(重量%)以下であることが好ましい。
そして、熱硬化されていない顆粒と熱硬化された顆粒とを所定の割合で混合し、所定の成形型に充填して、適宜設定される圧力でリング形状にプレス成形する。
この成形工程において、熱硬化されていない顆粒は圧力で潰され、かかる顆粒の内部に密集するボイドも潰されるのに対し、熱硬化された顆粒は圧力では潰されず、かかる顆粒の内部に密集する数多くのボイドは成形体の内部にそのまま残る。
次に、得られた成形体をアルゴン雰囲気中で焼成する。なお、主成分として窒化珪素を用いる場合には窒素雰囲気中で焼成し、主成分としてアルミナを用いる場合には、大気雰囲気中で焼成するとよい。
この焼成工程では、最初に、所定の焼結温度よりも50℃から100℃低い温度で2時間~10時間保持する。次に、所定の焼結温度で1~10時間保持し、その後室温まで冷却して、焼成体を得る。
この焼成工程において、熱硬化された顆粒の内部に密集する数多くのボイドが残ったまま焼成されることにより、焼成体の内部に気孔密集部4が形成される。また、熱硬化された顆粒と熱硬化されていない顆粒との硬さおよび熱収縮率の差などに起因して、焼結体を冷却する際に、気孔密集部4(すなわち、熱硬化された顆粒)の周囲に空隙5が形成される。
最後に、得られた焼成体に鏡面加工などの研磨処理を施す。これにより、鏡面加工された摺動面3に気孔密集部4および空隙5が露出した摺動部材1を得ることができる。
以上、本開示の実施形態について説明したが、本開示は上記実施形態に限定されるものではなく、その趣旨を逸脱しない限りにおいて種々の変更が可能である。たとえば、上述の実施形態では、リング状の摺動部材1について示したが、摺動部材1の形状はリング状に限られず、様々な形状の摺動部材1に本開示の技術を適用することができる。
今回開示された実施形態は全ての点で例示であって制限的なものではないと考えられるべきである。実に、上記した実施形態は多様な形態で具現され得る。また、上記の実施形態は、添付の請求の範囲及びその趣旨を逸脱することなく、様々な形態で省略、置換、変更されてもよい。
1 摺動部材
2 本体部
3 摺動面
4 気孔密集部
5 空隙(void)
10 気孔(pore)
2 本体部
3 摺動面
4 気孔密集部
5 空隙(void)
10 気孔(pore)
Claims (8)
- セラミックで構成される本体部の摺動面に、複数の気孔が密集した気孔密集部を有する
摺動部材。 - 前記摺動面は、前記気孔密集部と、前記気孔密集部の周囲に位置する空隙とを有する
請求項1に記載の摺動部材。 - 前記空隙は、前記気孔よりも大きい
請求項2に記載の摺動部材。 - 前記空隙は、端部に鋭角を有する形状である
請求項2または3に記載の摺動部材。 - 前記気孔密集部には、前記複数の気孔が球状に密集する
請求項1~4のいずれか一つに記載の摺動部材。 - 前記摺動面において前記気孔密集部に位置する前記気孔の内径は、前記気孔密集部以外の前記本体部に位置する前記気孔の内径よりも大きい
請求項1~5のいずれか一つに記載の摺動部材。 - 前記気孔密集部内に、連通した前記気孔が存在する
請求項1~6のいずれか一つに記載の摺動部材。 - 前記本体部は、炭化珪素が主成分である
請求項1~7のいずれか一つに記載の摺動部材。
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US18/022,687 US20230349422A1 (en) | 2020-08-24 | 2021-08-19 | Sliding member |
CN202180051889.4A CN116096690A (zh) | 2020-08-24 | 2021-08-19 | 滑动构件 |
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US (1) | US20230349422A1 (ja) |
EP (1) | EP4202246A4 (ja) |
JP (1) | JP7500737B2 (ja) |
CN (1) | CN116096690A (ja) |
WO (1) | WO2022044950A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH02256971A (ja) * | 1989-03-29 | 1990-10-17 | Showa Denko Kk | 摺動部材およびその製造方法 |
JPH09132478A (ja) * | 1995-11-07 | 1997-05-20 | Eagle Ind Co Ltd | 多孔質炭化珪素焼結体及びその製造方法 |
JP2001114570A (ja) * | 1999-10-15 | 2001-04-24 | Eagle Ind Co Ltd | 多孔質炭化珪素焼結体の製造方法 |
JP2002255651A (ja) | 2001-02-28 | 2002-09-11 | Tosoh Corp | 炭化ケイ素質セラミックス及びその製造方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3694540B2 (ja) * | 1994-10-31 | 2005-09-14 | 京セラ株式会社 | 摺動部材及びこれを用いた摺動装置 |
JPH08295576A (ja) * | 1995-04-24 | 1996-11-12 | Eagle Ind Co Ltd | 独立球形気孔を有するセラミックス部材およびその製造方法 |
JP3999468B2 (ja) * | 2001-03-16 | 2007-10-31 | 日本ピラー工業株式会社 | 摺動体及びその製造方法並びにメカニカルシール |
JP4141778B2 (ja) * | 2002-09-24 | 2008-08-27 | イーグル工業株式会社 | 摺動部品及びその製造方法 |
JP2007084368A (ja) * | 2005-09-21 | 2007-04-05 | Kyocera Corp | セラミックス摺動部材とその製造方法およびこれを用いたメカニカルシールリング用部材並びにメカニカルシールリング |
JP6614625B2 (ja) * | 2018-05-22 | 2019-12-04 | 帝国イオン株式会社 | 耐摩耗性皮膜、耐摩耗性部材及び耐摩耗性皮膜の製造方法並びに摺動機構 |
-
2021
- 2021-08-19 US US18/022,687 patent/US20230349422A1/en active Pending
- 2021-08-19 EP EP21861378.4A patent/EP4202246A4/en active Pending
- 2021-08-19 CN CN202180051889.4A patent/CN116096690A/zh active Pending
- 2021-08-19 WO PCT/JP2021/030359 patent/WO2022044950A1/ja unknown
- 2021-08-19 JP JP2022544514A patent/JP7500737B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02256971A (ja) * | 1989-03-29 | 1990-10-17 | Showa Denko Kk | 摺動部材およびその製造方法 |
JPH09132478A (ja) * | 1995-11-07 | 1997-05-20 | Eagle Ind Co Ltd | 多孔質炭化珪素焼結体及びその製造方法 |
JP2001114570A (ja) * | 1999-10-15 | 2001-04-24 | Eagle Ind Co Ltd | 多孔質炭化珪素焼結体の製造方法 |
JP2002255651A (ja) | 2001-02-28 | 2002-09-11 | Tosoh Corp | 炭化ケイ素質セラミックス及びその製造方法 |
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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EP4202246A1 (en) | 2023-06-28 |
JP7500737B2 (ja) | 2024-06-17 |
CN116096690A (zh) | 2023-05-09 |
JPWO2022044950A1 (ja) | 2022-03-03 |
EP4202246A4 (en) | 2024-03-27 |
US20230349422A1 (en) | 2023-11-02 |
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