CN103602849B - A kind of copper base alloy material for sliding bearing and preparation method thereof - Google Patents
A kind of copper base alloy material for sliding bearing and preparation method thereof Download PDFInfo
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- CN103602849B CN103602849B CN201310469249.2A CN201310469249A CN103602849B CN 103602849 B CN103602849 B CN 103602849B CN 201310469249 A CN201310469249 A CN 201310469249A CN 103602849 B CN103602849 B CN 103602849B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 23
- 239000010949 copper Substances 0.000 title claims abstract description 23
- 239000000956 alloy Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052718 tin Inorganic materials 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004411 aluminium Substances 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 7
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052582 BN Inorganic materials 0.000 claims abstract description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 235000013312 flour Nutrition 0.000 claims abstract description 4
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 4
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 4
- 239000011701 zinc Substances 0.000 claims abstract description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 12
- 238000005245 sintering Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000005995 Aluminium silicate Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 101710194948 Protein phosphatase PhpP Proteins 0.000 claims description 6
- 235000012211 aluminium silicate Nutrition 0.000 claims description 6
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 6
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 6
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011021 lapis lazuli Substances 0.000 claims description 6
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 235000010413 sodium alginate Nutrition 0.000 claims description 6
- 229940005550 sodium alginate Drugs 0.000 claims description 6
- 239000000661 sodium alginate Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000011135 tin Substances 0.000 claims description 6
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 6
- OMQSJNWFFJOIMO-UHFFFAOYSA-J zirconium tetrafluoride Chemical compound F[Zr](F)(F)F OMQSJNWFFJOIMO-UHFFFAOYSA-J 0.000 claims description 6
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 3
- 229940037003 alum Drugs 0.000 claims description 3
- ZEMWIYASLJTEHQ-UHFFFAOYSA-J aluminum;sodium;disulfate;dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZEMWIYASLJTEHQ-UHFFFAOYSA-J 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 3
- 235000013539 calcium stearate Nutrition 0.000 claims description 3
- 239000008116 calcium stearate Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 239000002105 nanoparticle Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004663 powder metallurgy Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 229910000990 Ni alloy Inorganic materials 0.000 abstract description 2
- VRUVRQYVUDCDMT-UHFFFAOYSA-N [Sn].[Ni].[Cu] Chemical compound [Sn].[Ni].[Cu] VRUVRQYVUDCDMT-UHFFFAOYSA-N 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- WIKSRXFQIZQFEH-UHFFFAOYSA-N [Cu].[Pb] Chemical compound [Cu].[Pb] WIKSRXFQIZQFEH-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a kind of copper base alloy material for sliding bearing, it is characterized in that, be made up of the raw material of following weight part: tin 1.2-1.4, nickel 8.2-8.5, copper 91.2-91.5, silica flour 0.4-0.5, Graphite Powder 99 1.1-1.3, iron powder 13-14, hard acid acid zinc 2-3, aluminium powder 2.2-2.4, boron nitride 0.2-0.4, bismuth 0.2-0.5, auxiliary agent 1-2; The present invention adopts powder metallurgy technology, and technique is simple, and cost is low, and what copper base alloy material for sliding bearing of the present invention adopted is a kind of copper tin-nickel alloy, not leaded, environmentally safe.The present invention adds tin and has good corrosion resistance nature, and nickel can carry heavy alloyed modulus of elasticity, plays the effect of reinforced alloys.The bearing of material manufacture of the present invention has the advantage of high-bearing capacity, corrosion-resistant, high temperature resistant, indeformable good stability and environmental protection.
Description
Technical field
The present invention relates to field of powder metallurgy, particularly a kind of copper base alloy material for sliding bearing and preparation method thereof.
Background technology
Sliding bearing of the internal-combustion engine mainly comprises bearing shell, lining, flange watt and thrust plate.The Main Function of sliding surface bearing has: 1, bolster and parts on shaft, the running accuracy of retainer shaft; 2, the friction and wear between rotating shaft and supporting is reduced.For occasion high speed, heavy duty, high precision, structure needing subdivision, sliding surface bearing need be adopted, as steam turbine, radial compressor, oil engine, large-size machine etc.Therefore sliding surface bearing is the strength member in sliding bearing of the internal-combustion engine, and as one of the part of engine most critical, the quality of material for sliding bearing performance directly affects the performance of engine.Along with oil engine carry to height, environmental protection future development, the requirement of bearing shell performance is improved constantly, require that material for sliding bearing not only has high supporting capacity and fatigue resistance, there is good environmental-protecting performance simultaneously, also there is no a kind of material for sliding bearing that can meet above-mentioned requirements at present.In addition, traditional copper-based alloy material is a kind of copper-lead bimetal steel band (as CuPb20Sn4, CuPb24Sn etc.), and it is widely used on high-mechanic oil engine.Problem is containing plumbous in this material, and the comparision contents of lead is high, and comparatively large to environmental disruption, do not meet social development needs, present society is in the urgent need to a kind of environment-friendly type copper-based alloy material for sliding bearing that can substitute traditional copper base alloy material.
Powder metallurgy be produce metal-powder or with metal-powder (or mixture of metal-powder and non-metal powder) as raw material, through shaping and sintering, produce the industrial technology of metallic substance, matrix material and all kinds goods.At present, powder metallurgy technology has been widely used in the fields such as traffic, machinery, electronics, aerospace, weapons, biology, new forms of energy, information and nuclear industry, becomes one of branch of most development vitality in novel material science.Powder metallurgy technology possess significantly energy-conservation, economize the high and series of advantages such as good stability of material, excellent performance, Product Precision, be very suitable for producing in enormous quantities.In addition, the material that part conventional casting methods and machining process cannot be prepared and complicated shape also available powders metallurgical technology manufacture, thus enjoy the attention of industry member.Powder metallurgy structural part product material composition does not limit by melting, both can add alloying constituent, also can add other structural constituent, and adjusts as requested in sizable scope, and then can reach the effect of mating with steel part in mechanical property.
Powder metallurgy mechanization degree is high, can reduce personnel, can raise the efficiency again, and then cost-saving.Powder metallurgy technology can replace traditional manufacturing process, for the vast traditional forms of enterprises is cost-saving.
So study the formula of the powder metallurgy of various component of machine, adapt to different needs, have great importance.
Summary of the invention
The object of this invention is to provide a kind of copper base alloy material for sliding bearing utilizing powder metallurgy technology to produce and preparation method thereof.
In order to realize object of the present invention, the present invention is by following scheme implementation:
A kind of copper base alloy material for sliding bearing, is made up of the raw material of following weight part: tin 1.2-1.4, nickel 8.2-8.5, copper 91.2-91.5, silica flour 0.4-0.5, Graphite Powder 99 1.1-1.3, iron powder 13-14, hard acid acid zinc 2-3, aluminium powder 2.2-2.4, boron nitride 0.2-0.4, bismuth 0.2-0.5, auxiliary agent 1-2;
Described auxiliary agent is made up of the raw material of following weight part: iron powder 3-4, kaolin 2-3, nano-sized carbon 1-2, Zirconium tetrafluoride 1-2, alum 2-3, sodium alginate 2-3, tripoly phosphate sodium STPP 1-2, lapis amiridis 2-3, copper sulfate 1-2, calcium stearate 1-2, vinyltriethoxysilane 2-3; Preparation method is by iron powder, kaolin, Zirconium tetrafluoride, alum, sodium alginate, tripoly phosphate sodium STPP, lapis amiridis, copper sulfate mixing, grind to form 200-300 order powder, then add vinyltriethoxysilane and mix, under 10-15MPa, be pressed into blank, then, calcine 3-4 hour at sending into 920-950 DEG C, after cooling, be ground into 300-400 order powder, mix with other remaining component, be heated to 60-70 DEG C, under 1200-1500 rev/min, stir 1-2 hour, to obtain final product.
Copper base alloy material for sliding bearing of the present invention, be made up of following concrete steps:
(1) by tin, nickel, copper, iron powder, aluminium powder, bismuth mixing, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying dry, oven dry, make bulk at 8-12MPa pressure, then under nitrogen protection atmosphere 650-750 DEG C carry out sintering 8-10 hour, cross 200-400 mesh sieve by after the crushing material after sintering;
(2) other remaining component is mixed;
(3) step (1), (2) material after mixing and stirring 60-75 minute, are loaded mould, are pressed into base at 55-59 DEG C;
(4) pressed compact is placed in sintering oven, to 800-850 DEG C of condition, sinters 1.5-2 hour with 6-8 DEG C/min of ramp; Then to 1050-1150 DEG C of condition, 2-3 hour is sintered with 5-7 DEG C/min of ramp; Room temperature is cooled in last air.
The present invention adopts powder metallurgy technology, and technique is simple, and cost is low, and what copper base alloy material for sliding bearing of the present invention adopted is a kind of copper tin-nickel alloy, not leaded, environmentally safe.The present invention adds tin and has good corrosion resistance nature, and nickel can carry heavy alloyed modulus of elasticity, plays the effect of reinforced alloys.The bearing of material manufacture of the present invention has the advantage of high-bearing capacity, corrosion-resistant, high temperature resistant, indeformable good stability and environmental protection.
Embodiment
Below by specific examples, the present invention is described in detail.
A kind of copper base alloy material for sliding bearing, is made up of the raw material of following weight part (kilogram): the acid of tin 1.2, nickel 8.2, copper 91.2, silica flour 0.4, Graphite Powder 99 1.1, iron powder 13, hard acid zinc 2, aluminium powder 2.2, boron nitride 0.2, bismuth 0.2, auxiliary agent 1;
Described auxiliary agent is made up of the raw material of following weight part (kilogram): iron powder 3, kaolin 2, nano-sized carbon 2, Zirconium tetrafluoride 1, alum 2, sodium alginate 3, tripoly phosphate sodium STPP 1, lapis amiridis 3, copper sulfate 1, calcium stearate 1, vinyltriethoxysilane 3; Preparation method is by iron powder, kaolin, Zirconium tetrafluoride, alum, sodium alginate, tripoly phosphate sodium STPP, lapis amiridis, copper sulfate mixing, grind to form 200-300 order powder, then add vinyltriethoxysilane and mix, under 10-15MPa, be pressed into blank, then, calcine 3-4 hour at sending into 920-950 DEG C, after cooling, be ground into 300-400 order powder, mix with other remaining component, be heated to 60-70 DEG C, under 1200-1500 rev/min, stir 1-2 hour, to obtain final product.
Copper base alloy material for sliding bearing of the present invention, be made up of following concrete steps:
(1) by tin, nickel, copper, iron powder, aluminium powder, bismuth mixing, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying dry, oven dry, make bulk at 8-12MPa pressure, then under nitrogen protection atmosphere 650-750 DEG C carry out sintering 8-10 hour, cross 200-400 mesh sieve by after the crushing material after sintering;
(2) other remaining component is mixed;
(3) step (1), (2) material after mixing and stirring 60-75 minute, are loaded mould, are pressed into base at 55-59 DEG C;
(4) pressed compact is placed in sintering oven, to 800-850 DEG C of condition, sinters 1.5-2 hour with 6-8 DEG C/min of ramp; Then to 1050-1150 DEG C of condition, 2-3 hour is sintered with 5-7 DEG C/min of ramp; Room temperature is cooled in last air.
Through detecting, the hardness of material for sliding bearing of the present invention: HRC50; Tensile strength: 580MPa.
Claims (2)
1. a copper base alloy material for sliding bearing, it is characterized in that, be made up of the raw material of following weight part: tin 1.2-1.4, nickel 8.2-8.5, copper 91.2-91.5, silica flour 0.4-0.5, Graphite Powder 99 1.1-1.3, iron powder 13-14, hard acid acid zinc 2-3, aluminium powder 2.2-2.4, boron nitride 0.2-0.4, bismuth 0.2-0.5, auxiliary agent 1-2;
Described auxiliary agent is made up of the raw material of following weight part: iron powder 3-4, kaolin 2-3, nano-sized carbon 1-2, Zirconium tetrafluoride 1-2, alum 2-3, sodium alginate 2-3, tripoly phosphate sodium STPP 1-2, lapis amiridis 2-3, copper sulfate 1-2, calcium stearate 1-2, vinyltriethoxysilane 2-3; Preparation method is by iron powder, kaolin, Zirconium tetrafluoride, alum, sodium alginate, tripoly phosphate sodium STPP, lapis amiridis, copper sulfate mixing, grind to form 200-300 order powder, then add vinyltriethoxysilane and mix, under 10-15MPa, be pressed into blank, then, calcine 3-4 hour at sending into 920-950 DEG C, after cooling, be ground into 300-400 order powder, mix with other remaining component, be heated to 60-70 DEG C, under 1200-1500 rev/min, stir 1-2 hour, to obtain final product.
2. copper base alloy material for sliding bearing according to claim 1, is characterized in that, be made up of following concrete steps:
(1) by tin, nickel, copper, iron powder, aluminium powder, bismuth mixing, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying dry, oven dry, make bulk at 8-12MPa pressure, then under nitrogen protection atmosphere 650-750 DEG C carry out sintering 8-10 hour, cross 200-400 mesh sieve by after the crushing material after sintering;
(2) other remaining component is mixed;
(3) step (1), (2) material after mixing and stirring 60-75 minute, are loaded mould, are pressed into base at 55-59 DEG C;
(4) pressed compact is placed in sintering oven, to 800-850 DEG C of condition, sinters 1.5-2 hour with 6-8 DEG C/min of ramp; Then to 1050-1150 DEG C of condition, 2-3 hour is sintered with 5-7 DEG C/min of ramp; Room temperature is cooled in last air.
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| CN104439250B (en) * | 2014-12-31 | 2017-02-22 | 扬州立德粉末冶金股份有限公司 | Method for manufacturing dispersion strengthening copper-based oil bearing |
| CN104946924A (en) * | 2015-06-25 | 2015-09-30 | 滁州达世汽车配件有限公司 | Strong-wear-resisting material |
| CN105154710A (en) * | 2015-08-31 | 2015-12-16 | 苏州莱特复合材料有限公司 | Friction-resisting nitrogen-phosphor composite copper-based powder metallurgy material and preparation method thereof |
| US10941465B2 (en) | 2016-03-04 | 2021-03-09 | Diamet Corporation | Cu-based sintered sliding material, and production method therefor |
| CN105925919A (en) * | 2016-06-15 | 2016-09-07 | 苏州洪河金属制品有限公司 | Modified copper-based high-strength composite material and preparation method thereof |
| CN106122273A (en) * | 2016-07-25 | 2016-11-16 | 安徽银球轴承有限公司 | A kind of preparation method of water pump impact resistance self-lubricating bearing |
| CN106224382A (en) * | 2016-07-25 | 2016-12-14 | 安徽银球轴承有限公司 | A kind of preparation method of used in high-speed motor high-bearing capacity self-lubricating bearing |
| CN106122272A (en) * | 2016-07-25 | 2016-11-16 | 安徽银球轴承有限公司 | A kind of preparation method of low temperature resistant cracking resistance self-lubricating bearing |
| CN107030288A (en) * | 2017-03-14 | 2017-08-11 | 陕西省机械研究院 | A kind of preparation method of natural gas compressor wear-and corrosion-resistant copper alloy ring |
| CN107725600A (en) * | 2017-10-13 | 2018-02-23 | 烟台大丰轴瓦有限责任公司 | The production technology of tin aluminium silicon bearing shell fatigue resistance in a kind of lifting |
| CN110257739B (en) * | 2019-06-21 | 2020-10-30 | 山东金麒麟股份有限公司 | Environment-friendly friction material, brake pad and preparation method of brake pad |
| CN112222785B (en) * | 2020-10-20 | 2022-12-20 | 苏州市正如懿电子科技有限公司 | Copper nut machining process |
| CN117604301A (en) * | 2023-11-24 | 2024-02-27 | 河南理工大学 | Preparation method of elastic refrigeration alloy |
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| CN102029386B (en) * | 2010-12-06 | 2012-12-12 | 中南大学 | High-hardness powder metallurgy low-alloy steel |
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| JPH04191301A (en) * | 1990-11-26 | 1992-07-09 | Kawasaki Steel Corp | Iron-based powder mixed material for powder meatallurgy |
| JP2008025018A (en) * | 2006-06-22 | 2008-02-07 | Akebono Brake Ind Co Ltd | Sintering friction material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101407889A (en) * | 2008-11-21 | 2009-04-15 | 海安县鹰球集团有限公司 | Powder metallurgy rare earth copper coated ferroalloy oil-retaining bearing and manufacturing method thereof |
| CN102029386B (en) * | 2010-12-06 | 2012-12-12 | 中南大学 | High-hardness powder metallurgy low-alloy steel |
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