US20130251586A1 - Sintered bearing and preparation method thereof - Google Patents

Sintered bearing and preparation method thereof Download PDF

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Publication number
US20130251586A1
US20130251586A1 US13/904,504 US201313904504A US2013251586A1 US 20130251586 A1 US20130251586 A1 US 20130251586A1 US 201313904504 A US201313904504 A US 201313904504A US 2013251586 A1 US2013251586 A1 US 2013251586A1
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Prior art keywords
kish graphite
iron
sintered
powder
sample
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US13/904,504
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English (en)
Inventor
Soon-Jae Tae
Tae-il Yoon
Hae-sik Kim
Hyun-Tae Kim
Tae-Young Choi
Gyo-Jin Chu
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Orient Precision Industries Inc
Hyundai Steel Co
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Orient Precision Industries Inc
Hyundai Steel Co
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Assigned to HYUNDAI STEEL COMPANY reassignment HYUNDAI STEEL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAE, SOON-JAE, YOON, TAE-IL, CHOI, TAE-YOUNG, KIM, HAE-SIK, KIM, HYUN-TAE, CHU, GYO-JIN
Assigned to ORIENT PRECISION INDUSTRIES INC., HYUNDAI STEEL COMPANY reassignment ORIENT PRECISION INDUSTRIES INC. CORRECTIVE ASSIGNMENT TO CORRECT THE ADD AN ASSIGNEE PREVIOUSLY RECORDED ON REEL 030504 FRAME 0670. ASSIGNOR(S) HEREBY CONFIRMS THE FROM ASSIGNORS TO HYUNDAI STEEL COMPANY. Assignors: CHOI, TAE-YOUNG, CHU, GYO-JIN, KIM, HAE-SIK, KIM, HYUN-TAE, TAE, SOON-JAE, YOON, TAE-IL
Publication of US20130251586A1 publication Critical patent/US20130251586A1/en
Abandoned legal-status Critical Current

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    • B22F1/007—
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/105—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing inorganic lubricating or binding agents, e.g. metal salts
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating
    • 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
    • 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
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • 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
    • 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
    • F16C33/10—Construction relative to lubrication
    • F16C33/1095—Construction relative to lubrication with solids as lubricant, e.g. dry coatings, powder
    • 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
    • F16C33/128—Porous bearings, e.g. bushes of sintered alloy
    • 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
    • C22C9/02—Alloys based on copper with tin as the next major constituent
    • 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
    • F16C2202/50—Lubricating properties
    • F16C2202/52—Graphite
    • 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
    • F16C33/145—Special methods of manufacture; Running-in of sintered porous bearings

Definitions

  • the present invention relates to a sintered bearing and a method of manufacturing the same and, more particularly, to a sintered bearing using kish graphite which is a byproduct of iron production and to a method of manufacturing the same.
  • Kish graphite is one of many byproducts generated from integrated iron and steel making processes in iron mills, including a blast furnace process, an iron making process, a steel making process, etc.
  • Kish graphite is mainly generated in blast furnaces, KR facilities, TCC plants, slag treatment plants, etc.
  • the present invention provides a sintered bearing, comprising metal powder, kish graphite, and a lubricant.
  • the sintered bearing may comprise, based on the total weight thereof, 0.01 ⁇ 10 parts by weight of the kish graphite, 0.01 ⁇ 1.0 parts by weight of the lubricant, and a balance of the metal powder.
  • the kish graphite may be a byproduct of iron production.
  • the metal powder may be one or more selected from the group consisting of a pure iron system, an iron-copper system, an iron-carbon system, an iron-carbon-copper system, a bronze system, and an iron-carbon-copper-nickel system.
  • the kish graphite may have a purity of 90 ⁇ 100% after refining.
  • the forming the molded body may be performed by subjecting the powder mixture to pressing at a pressure of 50 ⁇ 350 MPa at room temperature.
  • the forming the molded body may be performed so that the molded body has a compact density of 5.4 ⁇ 7.0 g/cm 3 .
  • the forming the sintered body may be performed at 850 ⁇ 1300° C. under atmospheric pressure.
  • the forming the sintered body may be performed for 1 ⁇ 6 hr.
  • the impregnating with oil may be performed at 50 ⁇ 150° C. in a vacuum.
  • a sintered bearing is manufactured by adding 0.01 ⁇ 10 parts by weight of kish graphite to metal powder, thus exhibiting superior abrasion resistance, strength and self-lubricity.
  • kish graphite having excellent slipping properties enables self-lubricating action of the sintered bearing upon initial operation, thus reducing the friction between a bearing shaft and a pin, thereby facilitating the initial operation and remarkably improving abrasion resistance of the sintered bearing.
  • kish graphite having high thermal conductivity can rapidly emit the frictional heat of the sintered bearing, ultimately decreasing abrasion loss.
  • a high-quality sintered bearing can be supplied to automobile industries and a variety of equipment industries, and is favorable in terms of reducing the manufacturing cost and is eco-friendly, by virtue of the recycling of kish graphite which is a byproduct of iron production.
  • FIG. 1 is a graph illustrating the coefficient of friction upon initial operation of the sample of Table 1;
  • FIG. 2 is a graph illustrating the coefficient of friction upon initial operation of the sample of Table 2;
  • FIG. 3 is a graph illustrating the coefficient of friction upon initial operation of the sample of Table 3;
  • FIG. 4 is a graph illustrating the coefficient of friction upon initial operation of the sample of Table 4.
  • FIG. 5 is a graph illustrating the hardness and abrasion loss of the samples of Examples 1 to 4 depending on changes in the amount of added kish graphite and in the density of the sample;
  • FIG. 7 is a graph illustrating the coefficient of friction upon initial operation of the sample of Table 5;
  • FIG. 9 is a graph illustrating the hardness of the sintered sample depending on the amount of added kish graphite.
  • the sintered bearing includes, based on the total weight thereof, 0.01 ⁇ 10 parts by weight of kish graphite, 0.01 ⁇ 1.0 parts by weight of the lubricant, and a balance of the metal powder.
  • the sintered bearing is a mechanical part used to rotate a shaft which is fixed at a predetermined position, in automobiles, electronic products, industrial machinery, construction machinery, etc., while supporting the weight of the shaft and the load applied to the shaft.
  • the sintered bearing is manufactured by adding kish graphite to metal powder so as to improve durability, lubricity, etc.
  • Kish graphite is a byproduct of iron production.
  • Kish graphite is dispersed in a metallic bearing upon sintering, thereby increasing strength of the bearing, and functions as a solid lubricant so as to enable self-lubricating action of the sintered bearing upon initial operation at which time oil is not discharged.
  • kish graphite has higher crystallinity compared to typical artificial graphite and has a smaller lamellar thickness compared to natural graphite.
  • the crystalline lattice gap of kish graphite is 3.359 ⁇ , which is similar to the theoretical value of graphite, and the crystallinity calculated by the X-ray diffraction bandwidth of d (002) plane is measured to be 178 ⁇ .
  • kish graphite has high thermal conductivity and thus rapidly emits fractional heat of the sintered bearing, increases abrasion resistance of the sintered bearing, and functions as a solid lubricant upon initial operation, thus exhibiting superior mechanical properties.
  • Kish graphite may include any kish graphite generated in iron mills, and may contain a variety of impurities such as iron, iron oxides, non-metal oxides, dust, etc., depending on the generation site, and thus the trapped and collected kish graphite is used after refining.
  • Chemical refining treatment includes froth flotation and pickling.
  • kish graphite which may be easily subjected to trapping, collection and refining and has a purity of 10% or more, is used.
  • KR mechanical stirring desulfurization
  • TCC molten iron treatment
  • Kish graphite generated in KR facilities includes large dust particles and SiO 2 particles, but its purity is as high as 90% or more, and thus only a mechanical separation process (separation depending on size) is performed without additional chemical refining treatment, making it possible to remove large dust particles and SiO 2 particles.
  • Kish graphite generated in TCC plants has a purity of about 60% and includes iron and iron oxides as impurities.
  • Kish graphite generated in TCC plants is preferably subjected to chemical refining treatment and sorting, so that the purity thereof is controlled to about 90% or more.
  • the refined kish graphite is sorted to a size of 50 mesh (300 ⁇ m) or less before use, and the recovery rate thereof is 90% or more.
  • the large particles separated via sorting may be reused via additional grinding.
  • Kish graphite is contained in an amount of 0.01 ⁇ 10 parts by weight based on the total weight of the sintered bearing. If the amount of kish graphite is less than 0.01 parts by weight based on the total weight of the sintered bearing, improvements in strength of the sintered bearing and self-lubricating action thereof are insignificant. In contrast, if the amount thereof exceeds 10 parts by weight, the strength of the sintered bearing may increase but sinterability may deteriorate due to an excess of kish graphite, undesirably lowering abrasion resistance.
  • Kish graphite is preferably contained in an amount of 0.5 ⁇ 5.0 parts by weight based on the total weight of the sintered bearing, so as to enhance strength of the sintered bearing and to improve self-lubricating action and sinterability.
  • the reason why the amount of kish graphite is limited as described above is that the use of kish graphite exceeding 5.0 parts by weight depending on the composition of metal powder may result in deteriorated sinterability undesirably lowering abrasion resistance.
  • the metal powder is any one or a mixture of two or more selected from the group consisting of a pure iron system, an iron-copper system, an iron-carbon system, an iron-carbon-copper system, a bronze system, and an iron-carbon-copper-nickel system.
  • the metal powder is a main component of the sintered bearing, and pure metal or a metal alloy is used in order to ensure mechanical strength such as abrasion resistance, hardness, etc.
  • the lubricant plays a role in lubricating the bearing.
  • the lubricant is used in an amount of 0.01 ⁇ 1.0 parts by weight based on the total weight of the sintered bearing. When the amount of the lubricant falls in the above range, strength is not decreased and lubrication effects may be exhibited.
  • the lubricant may be any one or a mixture of two or more selected from the group consisting of zinc stearate (C 36 H 70 O 4 Zn), Acrawax (C 38 H 76 N 2 O 2 ), and Kenolube paraffin.
  • the method of manufacturing the sintered bearing includes mixing metal powder, kish graphite, and a lubricant, thus forming a powder mixture, applying pressure to the powder mixture, thus forming a molded body, sintering the molded body, thus forming a sintered body, and impregnating the sintered body with oil.
  • the metal powder is mixed with kish graphite and the lubricant, thus obtaining the powder mixture.
  • Kish graphite is contained in an amount of 0.01 ⁇ 10 parts by weight based on the total weight of the powder mixture
  • the lubricant is contained in an amount of 0.01 ⁇ 1.0 parts by weight based on the total weight of the powder mixture
  • the balance is metal powder.
  • kish graphite is used is that high-quality flake graphite having very high crystallinity contained in kish graphite is recycled, and thus kish graphite is refined so as to use kish graphite having a purity of 90% or more. If the purity of kish graphite is less than 90%, improvements in abrasion resistance, lubricity, and strength of the sintered bearing are insignificant.
  • Kish graphite in a powder form having a particle size of 50 mesh or less is used to facilitate the dispersion of carbon upon sintering.
  • refined kish graphite is sorted using a sieve having an opening size of 50 mesh (300 ⁇ m).
  • Mesh is a unit which indicates the opening of a sieve or the particle size.
  • the metal powder is any one or a mixture of two or more selected from the group consisting of a pure iron system, an iron-copper system, an iron-carbon system, an iron-carbon-copper system, a bronze system, and an iron-carbon-copper-nickel system.
  • the lubricant may be any one or a mixture of two or more selected from the group consisting of zinc stearate (C 36 H 70 O 4 Zn), Acrawax (C 38 H 76 N 2 O 2 ), and Kenolube paraffin.
  • a mixing process may be performed using a super mixer or a high-speed mixer, and the mixing rate may be set to 50 ⁇ 100 rpm and the mixing time may be set to 1 ⁇ 120 min in order to accomplish homogeneous mixing.
  • the pressure applied to the powder mixture is set to 50 ⁇ 350 MPa using a press of 10 ⁇ 30 tons, and pressing at room temperature is performed, thus obtaining the molded body having a compact density of 5.4 ⁇ 7.0 g/cm 3 and an internal porosity of 10 ⁇ 30 vol % relative to the total volume ratio.
  • the pressure is less than 50 MPa, the molded body is not formed. In contrast, if the pressure exceeds 350 MPa, the internal porosity of the resulting sintered body is remarkably decreased, making it difficult to impregnate the sintered body with oil. Also, if the compact density is less than 5.4 g/cm 3 , the molded body is not formed. In contrast, if the density exceeds 7.0 g/cm 3 , porosity may decrease, making it impossible to impregnate the sintered body with oil.
  • the molded body may be sintered at 850 ⁇ 1300° C. under atmospheric pressure for 1 ⁇ 6 hr. Upon sintering the molded body, kish graphite is dispersed in the sintered body, so that the sintered body is strengthened thus enhancing strength.
  • the sintering temperature 850° C. corresponds to the minimum temperature able to form the sintered body, and it is unnecessary to use a high temperature exceeding 1300° C. If the sintering time is less than 1 hr, the sintering effect becomes insignificant. In contrast, if the sintering time exceeds 6 hr, the internal porosity of the sintered body may decrease due to excessive sintering.
  • the sintered bearing has pores therein due to the sintering, and oil functions to impregnate the pores of the sintered bearing therewith, thus increasing the strength of the sintered bearing. Impregnation with oil is performed in a vacuum at 50 ⁇ 150° C.
  • the method of manufacturing the sintered bearing according to the present invention enables recycling of waste kish graphite and is thus eco-friendly, and enables the abrasion resistance of the sintered bearing to be increased and the self-lubricity to be ensured.
  • NC100.24 powder as pure iron powder kish graphite powder having a particle size of 300 ⁇ m or less, and zinc stearate as a lubricant were mixed, thus preparing a powder mixture of Table 1 below.
  • NC100.24 is the trade name of pure iron powder available from Hoganas.
  • Table 1 below shows the composition of the sample of Example 1.
  • FIG. 1 illustrates the coefficient of friction upon initial operation of the sample of Table 1 (In FIG. 1 , KG indicates kish graphite).
  • NC100.24 powder as pure iron powder, kish graphite powder having a particle size of 300 ⁇ m or less, and zinc stearate as a lubricant were mixed, thus preparing a powder mixture of Table 2 below.
  • the disc shaped sample was sintered at 1000° C. for 3 hr.
  • Table 2 below shows the composition of the sample of Example 2.
  • FIG. 2 illustrates the coefficient of friction upon initial operation of the sample of Table 2.
  • the coefficient of friction upon initial operation of the sample was decreased in proportion to an increase in the amount of added kish graphite.
  • the maximum initial coefficient of friction was 0.059, which was lower compared to when the amount of added kish graphite was 0, 0.5 and 1.0 wt %, thus exhibiting low abrasion of the sample upon initial operation.
  • NC 100.24 powder as pure iron powder, kish graphite powder having a particle size of 300 ⁇ m or less, and zinc stearate as a lubricant were mixed, thus preparing a powder mixture of Table 3 below.
  • FIG. 3 illustrates the coefficient of friction upon initial operation of the sample of Table 3.
  • the coefficient of friction upon initial operation of the sample was decreased in proportion to an increase in the amount of added kish graphite.
  • the maximum initial coefficient of friction was 0.086, which was lower compared to when the amount of added kish graphite was 0, 0.5 and 1.0 wt %, thus exhibiting low abrasion of the sample upon initial operation.
  • NC100.24 powder as pure iron powder, kish graphite powder having a particle size of 300 ⁇ m or less, and zinc stearate as a lubricant were mixed, thus preparing a powder mixture of Table 4 below.
  • the disc shaped sample was sintered at 1000° C. for 3 hr.
  • Table 4 below shows the composition of the sample of Example 4.
  • FIG. 4 illustrates the coefficient of friction upon initial operation of the sample of Table 4.
  • FIG. 5 illustrates the hardness and abrasion loss of the samples of Examples 1 to 4 depending on changes in the amount of added kish graphite and in the density of the sample.
  • FIG. 5 the abrasion loss based on the difference in the weight of the sample before and after an abrasion test for 1 hr is depicted.
  • the samples containing 0.5 ⁇ 3.0 wt % of kish graphite were lower in abrasion loss compared to the sample without kish graphite.
  • abrasion loss was 0.049 ⁇ 0.067 g, which was evaluated to be the lowest among all the density conditions.
  • FIG. 6 illustrates the hardness of the sintered sample depending on the amount of added kish graphite.
  • the hardness of the sample was increased in proportion to an increase in the amount of added kish graphite. This is because carbon is dispersed in the pure iron-based master alloy in proportion to an increase in the amount of kish graphite in the pure iron-based sample, thus enhancing the strength of the sample.
  • NC 100.24 powder as pure iron powder, DMH powder comprising pure iron-25 wt % copper powder, kish graphite powder having a particle size of 300 ⁇ m or less, and zinc stearate as a lubricant were mixed, thus preparing a powder mixture of Table 5 below.
  • the disc shaped sample was sintered at 1000° C. for 3 hr.
  • FIG. 7 illustrates the coefficient of friction upon initial operation of the sample of Table 5.
  • the amount of added kish graphite should be appropriately adjusted depending on the composition of metal powder.
  • FIG. 8 illustrates the abrasion loss based on the difference in the weight of the sample before and after an abrasion test for 1 hr.
  • the hardness of the sample was increased in proportion to an increase in the amount of kish graphite in the iron-copper-based alloy. This is because carbon of kish graphite is dispersed in the iron-copper-based master alloy as the amount of kish graphite added to the iron-copper-based alloy increases, thus enhancing the strength of the sample.
  • kish graphite is added in an amount of 0.01 ⁇ 10 parts by weight so that abrasion resistance of the sintered bearing is enhanced and lubricity is imparted, resulting in a sintered bearing having high durability.
  • the present invention can provide a high-quality sintered bearing for automobile industries and a variety of equipment industries. Because kish graphite which is a byproduct of iron production can be recycled upon manufacturing the sintered bearing, the method of the invention is favorable in terms of reducing the manufacturing cost and is eco-friendly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Sliding-Contact Bearings (AREA)
  • Lubricants (AREA)
US13/904,504 2010-11-29 2013-05-29 Sintered bearing and preparation method thereof Abandoned US20130251586A1 (en)

Applications Claiming Priority (3)

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KR1020100119557A KR101066789B1 (ko) 2010-11-29 2010-11-29 소결 베어링 및 그 제조방법
KR10-2010-0119557 2010-11-29
PCT/KR2011/009164 WO2012074276A2 (ko) 2010-11-29 2011-11-29 소결 베어링 및 그 제조방법

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CN103537678A (zh) * 2013-10-11 2014-01-29 芜湖市鸿坤汽车零部件有限公司 一种粉末冶金汽车轴承及其制备方法
CN103909270B (zh) * 2013-12-19 2016-01-20 浙江中达精密部件股份有限公司 高性能粉末冶金含油轴承及其制作方法
JP6464353B2 (ja) * 2014-12-12 2019-02-06 黒崎播磨株式会社 剥離材及びその施工方法
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