EP1993760A2 - Poudre de bronze économique destinée à des paliers - Google Patents

Poudre de bronze économique destinée à des paliers

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Publication number
EP1993760A2
EP1993760A2 EP07752123A EP07752123A EP1993760A2 EP 1993760 A2 EP1993760 A2 EP 1993760A2 EP 07752123 A EP07752123 A EP 07752123A EP 07752123 A EP07752123 A EP 07752123A EP 1993760 A2 EP1993760 A2 EP 1993760A2
Authority
EP
European Patent Office
Prior art keywords
powder
bearings
bronze
sintered
powders
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.)
Withdrawn
Application number
EP07752123A
Other languages
German (de)
English (en)
Inventor
Nicola Veloff
Anil Vasant Nadkarni
Thomas Matthew Murphy
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.)
SCM Metal Products Inc
Original Assignee
SCM Metal Products Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SCM Metal Products Inc filed Critical SCM Metal Products Inc
Publication of EP1993760A2 publication Critical patent/EP1993760A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
    • B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • Self lubricated bearings are typically produced from premixed 90 wt. % copper + 10 wt. % tin powders + a lubricant.
  • the preraix is typically pressed into bearings in a die at pressures ranging from 22,000 lb/in 2 to 44,000 lb/in 2 to green densities in 6.0 g/cm 3 to 6.3 g/cm 3 range.
  • the lubricant helps minimize friction between the die and the bearing during pressing and subsequent ejection from the die, but must be removed in subsequent processing.
  • the green bearings are typically sintered in a three zone belt conveyor furnace.
  • the first zone is set at a temperature (typically 1000 0 F to 1200 0 F) required to burn the lubricant off.
  • the second zone is set at a temperature' (typically 1500 0 F to 156O 0 F) necessary to alloy the copper with the tin to form a bronze.
  • the belt speed is adjusted to provide sufficient time at the sintering temperature to ensure homogeneous alloy formation.
  • the third zone called cooling zone, is used to cool the bearings to room temperature. All three zones have a protective atmosphere used to prevent the bearings from getting oxidized.
  • the bearings undergo Dimensional Change (DC) during sintering, and are typically repressed in a die (sized) to meet the tight dimensional tolerances required with respect to the mating shafts.
  • the dimensional change during sintering is an important property. It must be controlled closely so that the bearings fit easily into the sizing dies, but at the same time do not undergo excessive deformation during sizing, which can lead to cracking.
  • the density of the sized bearings is controlled to provide defined volume of porosity.
  • the sized bearings are then immersed in oil under vacuum. The oil gets impregnated into the porosity by capillary action.
  • the bearings are used in motors of varied sizes. During use when the motor- is turned on, the bearing warms up causing the oil to ooze out of the pores and lubricate the mating surfaces. The reverse occurs when the motor is turned off. As the bearing starts to cool the oil goes back into the pores by capillary action. Best capillary action is achieved SCM 0005-US2
  • diluted bronzes To reduce the cost of the bearings, the powder metal industry has used iron powder to replace some of the copper and tin. Such materials are called diluted bronzes. While diluted bronze bearings work satisfactorily in some applications, they typically have higher coefficients of friction and higher peak and steady state operating temperatures than the standard bronze bearings. They also tend to create more noise during operation compared to the standard bronze bearings.
  • the present invention provides a new process for making a low cost powder for the manufacture of high performance bearings. Improved powders and sintered parts (e.g., bearings) are also provided.
  • the powders of the present invention are formed by blending iron powder with fine cuprous oxide powder and elemental tin powder.
  • the blended powders are then thermally treated under a reducing atmosphere to form a sintered cake, which is milled to a powder.
  • Figure 1 shows a photomicrograph of Powder A, an embodiment of the invention.
  • Figure 2 shows a photomicrograph of Powder D, an additional embodiment of the invention.
  • Figure 3 shows a photomicrograph of Powder E, yet another embodiment of the invention.
  • Figure 4 shows a photomicrograph of a bearing made from Powder A.
  • Figure 5 shows a photomicrograph of a bearing made from Powder D.
  • Figure 6 shows a photomicrograph of a bearing made from Powder E.
  • Figure 7 shows a photomicrograph of a bearing made from the diluted bronze powder F.
  • Figure 8 shows a photomicrograph of a bearing made from the diluted bronze powder G.
  • Figure 9 shows a photomicrograph of a bearing made from the standard premixed bronze powder.
  • Figure 10 compares the DC of sintered bearings of this invention using sponge iron powder with the standard premixed bronze bearings and the diluted bronze bearings, made with the same iron powder, as a function of the sintering temperature.
  • SCM 0005-US2
  • Figure 11 compares the RCS of sintered bearings of this invention using sponge iron powder with the standard premixed bronze bearings and diluted bronze bearings, made with the same iron powder, as a function of the sintering temperature.
  • Figure 12 shows a photomicrograph of a bearing made from powder H.
  • Figure 13 shows a photomicrograph of a bearing made from powder I.
  • Figure H shows a photomicrograph of a bearing made from powder J.
  • Figure 15 shows a photomicrograph of a bearing made from powder K.
  • Figure 16 compares the DC of sintered bearings of this invention using atomized iron powder with the diluted bronze bearings, made with the same iron powder, as a function of the sintering temperature.
  • Figure 17 compares the RCS of sintered bearings of this invention using atomized iron powder with the diluted bronze bearings, made with the same iron powder, as a function of the sintering temperature.
  • Figure 18 shows a photomicrograph of the copper coated iron powder.
  • Figure 19 shows a photomicrograph of a bearing made from powder L.
  • Figure 20 compares the DC of sintered bearings made from powders L and E, which have similar iron, copper and tin contents, with the standard premixed bronze bearings as a function of sintering temperature.
  • Figure 21 compares the RCS of sintered bearings made from powders L and E with the standard premixed bronze bearings as a function of sintering temperature SCM 0005-US2
  • This invention relates to a new process for making a low cost powder for the manufacture of high performance bearings. Powder cost is lowered by replacing some of the bronze powder with iron powder. However, unlike bearings made from diluted bronze powders of the prior art, the properties of the bearings made from the powder of the instant invention are superior to the conventional bronze bearings, as well as conventional diluted bronze bearings, as shown by the examples.
  • the process of the invention involves blending an iron powder with fine cuprous oxide and elemental tin powders.
  • Any type of iron powder such as sponge, atomized, electrolytic, etc. can be used; however, sponge iron powder is preferred.
  • Preferred particle size fraction of the iron powder is -150 mesh ( ⁇ 106 ⁇ m), although -325 mesh ( ⁇ 44 ⁇ m) to -60 mesh ( ⁇ 250 ⁇ m)_fractions can be used.
  • the cuprous oxide and tin powders should be as fine as possible.
  • Preferred median particles size (D 50 ) of cuprous oxide powder is 10-25 ⁇ m, although powders with D 50 of up to 50 ⁇ m can be used.
  • Preferred D50 of tin powder is 3-12 ⁇ m; however powders with D 50 up to 20 ⁇ m can be used.
  • the blended powders are thermally treated in a furnace at a temperature ranging from 800 0 F to 1600 0 F, the preferred temperature being about 1300 0 F.
  • the cuprous oxide is reduced to copper, the tin melts and alloys with the copper to form bronze.
  • the liquid tin also alloys with the iron and helps diffusion bond the bronze to the iron powder.
  • the powders form a sintered cake, which is milled and screened to the desired particle size fraction.
  • Preferred particle size fraction of the milled powder is -60 mesh although size fractions up to -20 mesh can be used.
  • the preferred copper content in the final powder is in the range of 20-50 wt. %, although it can be in the 10-70 wt. % range.
  • the preferred tin content in the final powder is in the 2-5 wt. % range, although it can be in the 1-7 wt. % range.
  • the powders produced as described above are blended with 0.25 wt. % to 1.00 wt. % powdered lubricant, typically a stearate or wax.
  • the blended powders are pressed into bearings to the desired density.
  • the strength of the bearing in the pressed (green) condition is important for the subsequent handling in the manufacturing process. Green strength is measured on a standard bar according to the Metal Powder Industries Federation (MPIF) standard procedure.
  • the powders of this invention had green strength comparable to or exceeding the green strength of standard premixed and diluted bronze powders.
  • the bearings are then sintered at an appropriate temperature to achieve the desired sintered density. It is important to avoid excessive DC.
  • the powders of this invention showed remarkably low DC during sintering over a fairly wide temperature range.
  • the standard bronze powders show a considerable variation in DC over the 1500 0 F to 156O 0 F temperature range used in the industry. Such temperatures are necessary to obtain sufficient RCS discussed above. It was surprising to find that the bearings made from the powders of this invention can be sintered at about 1400 0 F, which is substantially lower than the standard premixed bronze bearings.
  • the RCS of the inventive bearings are significantly higher than the standard bronze bearings sintered at their normal sintering temperatures. Lower sintering temperature is desirable from the standpoint of energy savings; energy cost is a major factor in the total cost of manufacturing bearings.
  • SCM 0005-US2 is desirable from the standpoint of energy savings; energy cost is a major factor in the total cost of manufacturing bearings.
  • the sintered bearings are sized or repressed by putting them back in a die.
  • the low DC of the inventive bearings is a definite advantage as minimal deformation is required to size the bearings to the desired dimensional tolerances. As mentioned above, excessive deformation can cause the bearings to crack during sizing.
  • the sized bearings are immersed in oil under vacuum. The oil impregnates the porosity in the bearings by capillary action. Small pore size is desirable for the most effective capillary action.
  • the inventive bearings develop smaller pores than the standard bronze bearings and consequently give higher oil efficiency. The latter is a measure of the percentage of total porosity in the bearing that is filled with oil.
  • the high radial crush strengths obtained during sintering of the inventive bearings are retained in the sized and oiled bearings. This is an advantage in applications where the bearing loads are high.
  • the oiled bearings are tested in a bearing tester.
  • the bearing is mounted on a steel shaft, and a load is applied to the shaft.
  • the shaft is rotated at a high speed (rpm).
  • the friction between the shaft and the bearing causes the bearing to heat up.
  • the oil goes to the mating surface and provides lubrication.
  • the better the lubrication the lower the bearing temperature and the lower the wear on the bearing.
  • the temperature peaks early in the bearing test and eventually reaches a steady state level. Lower peak and steady state temperatures are desirable to maintain the integrity of the oil and improve the life of the motor.
  • the bearings of this invention showed lower coefficient of friction and lower peak and steady state temperatures than the standard bronze and diluted bronze bearings. This is attributed to the fine pores and the superior capillary action they provide. All of these observations are confirmed by the Examples 1 and 2 that follow.
  • Another embodiment of the present invention is to use a copper coated iron powder and adding sufficient tin powder to it to convert the copper into 90:10 bronze during sintering of the parts.
  • Methods to coat the iron powder with copper are known, and include precipitation, electrolysis, etc. Similar proportions of iron, copper and tin in the final powders can be used as described above. Bearings made from these powders are also SCM 0005-US2
  • the blended powder was thermally treated at a range of temperatures from 1300 0 F to 1500 0 F in hydrogen atmosphere.
  • the milled cake was sieved on a 60 mesh screen.
  • the cuprous oxide was reduced to copper and the resultant powders, labeled A, B and C, contained 70 wt. % iron, 27 wt. % copper and 3 wt. % tin.
  • the copper and tin alloyed with each other and formed bronze.
  • Table- 1 shows the processing parameters for the five powders of this invention. SCM 0005-US2
  • Figures 1, 2 and 3 show photomicrographs of Powders A, D and E, respectively. They show that most of the iron and bronze particles are diffusion bonded to each other. This prevents segregation and gives a more uniform powder. As will become clear from the data presented below, a thermal treatment at 1300 0 F is sufficient to produce a good quality bronze for the bearings.
  • Two grades of diluted bronze powders were made by blending 70 parts -60 mesh sponge iron powder and 30 parts -150 mesh premixed bronze powder (labeled F), and 50 parts -60 mesh sponge iron powder and 50 parts -150 mesh premixed bronze powder (labeled G).
  • the powders were blended with 0.50 wt. % zinc stearate and 0.25 Wt. % lithium stearate as lubricants.
  • the properties of the lubricated powder are shown in Table-3.
  • the powders were pressed into standard transverse rupture strength bars to 6.3 g/cm density and the green strength was measured - see Table-4.
  • the powders were pressed into bearings with nominally 0.75 inch inside diameter X 1.0 inch outside diameter X 0.75 inch length. They were preheated at 1000 0 F to burn off the lubricant and sintered at temperatures ranging from 1400 0 F to 156O 0 F in a belt conveyor furnace under a reducing atmosphere composed of 75% hydrogen and 25% nitrogen.
  • Figures 4 through 6 show the photomicrographs of the sintered bearings made from powders A, D and E of this invention.
  • Figures 7 and 8 show the photomicrographs of the bearings made from the diluted bronze powders F and G respectively.
  • Figure 9 shows the photomicrograph of the sintered bearing made from the premixed bronze powder.
  • the bearings of the present invention clearly show a finer pore structure (dark areas) than the conventional premixed and diluted bronze bearings.
  • Figure 10 compares the DC of sintered bearings of this invention with the standard premixed bronze bearings and the diluted bronze bearings as a function of the sintering temperature.
  • the data shows that the bearings made from the powders of this invention undergo consistent and low DC during sintering. This is desirable because it provides predictability in terms of die sizes required for the sizing operation and also minimizes deformation necessary during sizing.
  • the DC is also stable over the temperature range SCM 0005-US2
  • Figure 11 compares the RCS of sintered bearings of this invention with the standard premixed bronze bearings and diluted bronze bearings as a function of the sintering temperature/
  • the bearings of this invention have higher RCS than the premixed and diluted bronze bearings over the entire temperature range.
  • One major advantage of the powders of this invention is that the bearings can be sintered at 1400 0 F, and still achieve a higher RCS than bearings made from the standard premixed bronze and the diluted bronze powders sintered at higher temperatures. Lower sintering temperature is beneficial from the energy savings standpoint, and adds to the already lower cost of the powder resulting from replacement of some of the bronze powder by iron powder.
  • the bearings sintered at 1400 and 1500 0 F were immersed in oil under vacuum.
  • the oil penetrated the porosity by capillary action.
  • Table-5 shows the oil content and oil efficiency (% pores filled with oil) data on these bearings.
  • the bearings made from the powders of this invention had oil efficiencies (94-96%) comparable to the standard premixed bronze bearings (94%) and the diluted bronze bearings (97-98 %). Oil efficiency is measured as a percentage of porosity present in the bearings that is filled with oil.
  • the sintered bearings made from powder A (70 wt. % iron, 27 wt. % copper, 3 Wt. % tin), powder D (50 wt. % iron, 45 wt. % copper, 5 wt. % tin), powder E (80 wt.% iron, 18 wt.% copper, 2 wt. % tin), powder F (70 wt.% iron, 30 wt.% premixed bronze), powder G (50 wt. % iron, 50 wt. % premixed bronze), and the standard premixed bronze were sized and filled with oil as indicated above.
  • the premixed bronze and diluted bronze bearings SCM 0005-US2
  • Table-6 shows the oil content and oil efficiency of these bearings.
  • the bearings made from the powders of this invention had lower coefficients of friction than the bearings made from the standard premixed bronze (Std.) and the diluted bronze powders (F and G). This is due to the smaller pores in the bearings, which provide more efficient transport of oil to the mating surface between the bearing and the shaft.
  • the lower coefficient of friction leads to lower peak and steady state operating temperatures in the bearing. This translates into lower oil loss, and is desirable from the standpoint of the oil integrity and the long term performance of the bearing.
  • Two grades of diluted bronze powders were made by blending 70 parts -60 mesh atomized iron powder and 30 parts -150 mesh premixed bronze powder (labeled J), and 50 parts -60 mesh atomized iron powder and 50 parts -150 mesh premixed bronze powder (labeled K).
  • microstructures of these powders were similar to the corresponding powders made using the sponge iron powder as in Example 1, and are not shown here. Table-8 shows the properties of these powders.
  • the powders were pressed into standard transverse rupture strength bars to a nominal 6.3 g/cm 3 density and the green strength was measured - see Table- 10.
  • the powders of this invention (H and I) have superior green strength compared to the diluted bronze powders made using the same atomized iron powder, and the standard premixed bronze of Example 1 (Table-4).
  • the powders were pressed into bearings with nominally 0.75 inch inside diameter X 1.0 inch outside diameter X 0.75 inch length. They were preheated at 1000 0 F to burn off the lubricant and sintered at a temperature in the 1400 0 F to 156O 0 F range, in the belt conveyor furnace under a reducing atmosphere composed of 75% hydrogen and 25% nitrogen.
  • Table- 1 1 shows the DC and RCS of sintered bearings of this invention and the corresponding diluted bronze bearings.
  • the bearings made using the atomized iron powder (H and I) have lower DC and higher RCS values than the corresponding diluted bronze bearings (J and K).
  • Figures 12 through 15 show the photomicrographs of the sintered bearings.
  • the bearings of this invention (powders H and I) show finer pore structures than the corresponding diluted bronze bearings (powders J and K).
  • the sintered bearings were immersed in oil under vacuum.
  • Table-12 shows the oil content and oil efficiency data on these bearings.
  • the bearings made from the powders of this invention had oil efficiencies at least as good as or better than the diluted bronze bearings and the standard premixed bronze bearings of Eaxmple-1.
  • the sintered bearings were sized and filled with oil as described previously.
  • Tab Ie- 13 shows the oil content and oil efficiency of these bearings.
  • the sized bearings of this invention were at least as good as or better than the diluted bronze bearings and the standard premixed bronze bearings of Example- 1.
  • the bearings made from the powders of this invention had lower coefficients of friction than the bearings made from the diluted bronze powders and the standard premixed bronze powder (Table-7).
  • Table-7 standard premixed bronze powder
  • FIG. 18 shows a photomicrograph of this powder.
  • the bearings made from this powder were compared with the bearings made from powder E, having a similar composition, and the standard premixed bronze powder discussed in Example-1.
  • the copper coated iron powder contained 82% iron (core) and 18% copper (coating). 98 parts of this powder were blended with 2 parts of fine tin powder, 0.50 parts of zinc stearate and 0.25 parts of lithium stearate.
  • the powder was labeled L. SCM 0005-US2
  • Table-15 shows the properties of this powder along with powder E and the standard premixed bronze powder. The powder properties are similar to powder E.
  • the powders were pressed into standard transverse rupture strength bars to a nominal 6.3 g/cm 3 density and the green strength was measured — see Table-16.
  • the powder L has green strength superior to powder E and the standard premixed bronze powder of Example 1.
  • the powder was pressed into bearings with nominally 0.75 inch inside diameter X 1.0 - inch outside diameter X 0.75 inch length. They were preheated at 1000 0 F to burn off the lubricant and sintered at 1400 0 F in the belt conveyor furnace under a reducing atmosphere composed of 75% hydrogen and 25% nitrogen.
  • Table-17 shows the DC and RCS of the sintered bearings, comparing them to bearings made from powder E and the standard premixed bronze powder.
  • the bearings made from powder L have a DC similar to those made from powder E. Powder L also gives an SCM 0005-US2
  • Figure 19 shows the photomicrograph of a sintered bearing.
  • the bearing shows a similar pore size as the bearing made from powder E ( Figure 6), but a finer pore size than the bearing made from the premixed bronze powder (Figure 9).
  • Table- 18 shows the oil content and oil efficiency data on these bearings.
  • the bearings made from the powders of this invention had oil efficiencies similar to powder E and the standard premixed bronze bearings of Eaxmple-1. SCM 0005-US2
  • the sintered bearings were sized and filled with oil as described previously. Table-19 shows the oil content and oil efficiency of these bearings.
  • the sized bearings made from powder L were similar to bearings made from powder E and the standard premixed bronze bearings of Example- 1.
  • the bearings made from the powder L had a lower coefficient of friction than the bearings made from the standard premixed bronze powder.
  • the lower coefficient of friction resulted in lower peak and steady state operating temperatures in the bearings. This, in turn, translated into lower oil loss, which would be expected to give better oil integrity and long term performance of the bearings.
  • the bearings made from the powders of this invention showed superior performance in the bearing tests than the bearings made from the standard premixed bronze powder (Std.) and the diluted bronze bearings ( F, G, J and K). They had lower coefficients of friction, which resulted in lower peak and steady state operating temperatures, and less oil loss. The latter is a sign of better oil integrity and excellent bearing performance over a long period of time.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Powder Metallurgy (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

La présente invention concerne un nouveau procédé de production d'une poudre économique permettant de fabriquer des paliers hautes performances. Des poudres améliorées et des parties frittées améliorées (des paliers, par exemple) sont également présentées. Les poudres selon la présente invention sont formées par le mélange de poudre de fer avec de la poudre fine d'oxyde de cuivre et de la poudre d'étain élémentaire. Les poudres mélangées sont ensuite traitées thermiquement dans une atmosphère réductrice pour former un pain fritté qui est broyé sous forme de poudre.
EP07752123A 2006-03-02 2007-02-28 Poudre de bronze économique destinée à des paliers Withdrawn EP1993760A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US77881406P 2006-03-02 2006-03-02
US83526206P 2006-08-03 2006-08-03
US11/710,688 US20070231182A1 (en) 2006-03-02 2007-02-26 Low cost bronze powder for high performance bearings
PCT/US2007/005402 WO2007103193A2 (fr) 2006-03-02 2007-02-28 Poudre de bronze économique destinée à des paliers

Publications (1)

Publication Number Publication Date
EP1993760A2 true EP1993760A2 (fr) 2008-11-26

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EP07752123A Withdrawn EP1993760A2 (fr) 2006-03-02 2007-02-28 Poudre de bronze économique destinée à des paliers

Country Status (4)

Country Link
US (1) US20070231182A1 (fr)
EP (1) EP1993760A2 (fr)
TW (1) TW200738375A (fr)
WO (1) WO2007103193A2 (fr)

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JP6199106B2 (ja) * 2013-07-22 2017-09-20 Ntn株式会社 焼結軸受及びその製造方法、並びに焼結軸受を備えた流体動圧軸受装置
CN104550906B (zh) * 2014-12-22 2017-01-04 昆山德泰新材料科技有限公司 一种预混合青铜粉、制备方法及其应用
CN105458275B (zh) * 2015-12-10 2018-01-30 湖南省天心博力科技有限公司 一种粉末冶金用铜锡10合金粉末的制造方法
CN112444152B (zh) * 2019-09-03 2022-01-11 广州力及热管理科技有限公司 一种链状铜金属毛细结构及其制作方法
CN113399669A (zh) * 2020-03-17 2021-09-17 永源科技材料股份有限公司 毛细结构
CN111451519B (zh) * 2020-04-03 2022-10-14 龙门金南磁性材料有限公司 一种黄铜包铁粉的制备方法
CN112756608A (zh) * 2020-12-14 2021-05-07 北京有研粉末新材料研究院有限公司 一种原位生成铜包铁热管吸液芯材料的制备方法
CN116174708A (zh) * 2022-12-05 2023-05-30 中南大学 一种含流态化高效氧化纤维状铜粉的微型含油轴承材料

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WO2007103193A3 (fr) 2008-10-09
TW200738375A (en) 2007-10-16
US20070231182A1 (en) 2007-10-04

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