CN1435498A - Sintered alloy, its production method, electric fuel pump comprising sintered alloy bearing - Google Patents

Sintered alloy, its production method, electric fuel pump comprising sintered alloy bearing Download PDF

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Publication number
CN1435498A
CN1435498A CN03103464A CN03103464A CN1435498A CN 1435498 A CN1435498 A CN 1435498A CN 03103464 A CN03103464 A CN 03103464A CN 03103464 A CN03103464 A CN 03103464A CN 1435498 A CN1435498 A CN 1435498A
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CN
China
Prior art keywords
sintered alloy
alloy body
sizing
tin coating
bearing
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Pending
Application number
CN03103464A
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Chinese (zh)
Inventor
清水辉夫
丸山恒夫
武井大明
村上洋一
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.)
Mitsubishi Materials Corp
Denso Corp
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Mitsubishi Materials Corp
Denso Corp
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Filing date
Publication date
Application filed by Mitsubishi Materials Corp, Denso Corp filed Critical Mitsubishi Materials Corp
Publication of CN1435498A publication Critical patent/CN1435498A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/10—Bearings
    • 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
    • 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
    • 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
    • B22F3/164—Partial deformation or calibration
    • B22F2003/166—Surface calibration, blasting, burnishing, sizing, coining
    • 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
    • B22F2003/241—Chemical after-treatment on the surface
    • B22F2003/242—Coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12708—Sn-base component
    • Y10T428/12715—Next to Group IB metal-base component

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Sliding-Contact Bearings (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

A sintered alloy article having superior corrosion resistance while also ensuring product dimensional accuracy is provided. A sintered alloy body is formed by molding and sintering (S2) a raw material powder containing copper, and tin plating (S4) treatment on this sintered alloy body is performed, followed by sizing (S5). When the tin plating layer is compressed during sizing, the tin plating layer is formed to a nearly uniform thickness, pores opened in the outer surface of the sintered alloy body are blocked by the above tin plating, as a result of said tin plating being compressed by the above sizing. Moreover, by combining a copper-based sintered alloy and tin plating, a sintered body is obtained provided with both corrosion resistance to sulfur and its compounds as well as corrosion resistance to formic acid, acetic acid and other organic acids.

Description

Sintered alloy and production method thereof and the electric fuel punp that comprises sintered bearing
Technical field
The present invention relates to a kind of sintered alloy body, its production method and a kind of electric fuel punp that comprises this sintered bearing.
Background technology
The petrolic autopulse of prior art has the structure as example shown in Fig. 8 schematic cross sectional views.As shown in the figure, the structure of above-mentioned oil-fuel pump 1 comprises the rotation axis 4 that is arranged on motor 3 two ends in the housing 2, and rotation axis is subjected to bearing 5 supportings; Blade 6 inserts an end of above-mentioned rotation axis 4, and narrow gasoline channel 7 forms along space (not shown) between the outer circumference surface of above-mentioned blade 6 and motor (armature) 3 and bearing 5 and the rotation axis 4.During autopulse work blade 6 is rotated with the rotation of said motor 3, under the drive of rotating vane 6, gasoline enters housing 2, and the gasoline channel that the gasoline that enters forms along the space that does not show between the outer circumference surface of blade 6 and motor 3 and bearing 5 and the rotation axis 4 is fed to the petrol engine of other setting.In addition, in Fig. 8, a spot of oil fuel is by the outer circumference surface of two bearings 5, and the gasoline that has been improved pressure by blade 6 arrives the outer circumference surface of motor 3 by the gasoline channel 7 of housing 1.
The copper base sintered alloy body and function is made the bearing 5 in the above-mentioned petrolift, in the process of producing this sintered alloy, the raw material powder that compression earlier contains copper forms pressed compact, this pressed compact carries out sintering then, form the sintered alloy body, this sintered alloy body compresses and realizes pressure-sizing, obtains pre-determining size.
Because above-mentioned bearing 5 is used in the environment of contact oil fuel, the corrosion that is considered to resist oil fuel by the copper base sintered alloy body of the copper-containing raw material powder constituent of introducing previously.But even under the condition of copper base sintered alloy, if used oil fuel contains sulphur or its compound, perhaps used oil fuel contains formic acid, acetate and other organic acids; Still there is the problem that makes the life-span reduction because of corrosion.
Therefore, a kind of copper-lead bearing of Japanese unauthorized patent application is introduced in the first open No.5-203938A.Zinc-plated, lead plating of wherein carrying out on the interior and outside surface of copper base bearing or terne coating can improve bearing opposing corrosive performance (see patent the 0005th section) effectively.
Yet, for the product that requires dimensional precision, as 10 μ m or littler, even before electroplating processes, carry out pressure-sizing, product is in and allows within the scale error, but because the plating of carrying out thereafter causes variation in thickness, still has the problem that can not guarantee the dimensional precision that requires.
Summary of the invention
In order to address the above problem, the purpose of this invention is to provide a kind of sintered alloy body, it has excellent erosion resistance and can guarantee dimensional accuracy of products; And production method and a kind of electric fuel punp, the bearing that it uses described sintered alloy to form.
To achieve these goals, the present invention proposes a kind of sintered alloy body, can contain the raw material powder of copper, then the sintered alloy that obtains is provided with tin coating, thereafter the sintered alloy with described tin coating is carried out pressure-sizing and make by molded and sintering.
Resulting sintered alloy body and function erosion-resisting tin coating covering copper base sintered alloy body thereby have the high corrosion resistance energy.Especially, copper base sintered alloy can obtain anti-sulphur or its compound and formic acid, acetate and other organic acid corrosive performances in conjunction with zinc-plated.In addition, because the sintered alloy body that has tin coating is carried out pressure-sizing, comprise that the final size of the product of tin coating can be within predetermined scale error.In addition, by pressure-sizing tin coating is compressed, tin coating has formed very homogeneous thickness, and simultaneously, the tin coating of compression has stopped up the pore on the sintered alloy external surface.
Above-mentioned sintered alloy body can be used as sliding part.
The result is, obtained a kind of sliding part, and it has opposing sulphur and its compound and formic acid, acetate and other organic acid corrosive performances.
The present invention also provides a kind of production method of sintered alloy body, comprising: the raw material powder that molded and sintering contains copper forms the sintered alloy body, the sintered alloy body is carried out zinc-plated, is thereafter pressure-sizing.
Make result in this way be, because tin coating is compressed in the pressure-sizing process, tin coating has formed very homogeneous thickness, be compressed when pressure-sizing owing to tin coating simultaneously, pore on the sintered alloy external surface is covered by described tin coating, the tin coating of compression has stopped up the pore on the sintered alloy external surface, the lining that has improved described tin coating.Carry out pressure-sizing owing to have the sintered alloy body of tin coating in addition, comprise that the size of the product of tin coating can arrive within the predetermined size error in finishing.In addition, in conjunction with zinc-plated, the sintered alloy body that obtains has anti-sulphur or its compound and formic acid, acetate and other organic acid corrosive performances by the copper base sintered alloy body.
The present invention also provides a kind of autopulse, and it comprises the bearing that above-mentioned sintered alloy body forms.
The result is that the bearing of autopulse is in the oil fuel that contains sulphur and its compound, or the work-ing life that has excellence in containing formic acid, acetate and other organic acid corrosive oil fuel.
Description of drawings
Fig. 1 is the schema of the production method of explanation first embodiment of the invention;
Fig. 2 is the skeleton view of the sintered alloy body of the first embodiment of the present invention;
Fig. 3 is the local amplification view of the sintered alloy body of the first embodiment of the present invention;
Fig. 4 is the sectional view of the pressure-sizing of the explanation first embodiment of the present invention;
Fig. 5 is the amplification view of the preceding tin coating of the pressure-sizing of the first embodiment of the present invention;
Fig. 6 is the amplification view of the tin coating after the pressure-sizing of the first embodiment of the present invention;
Fig. 7 is the schema of the production method of the explanation second embodiment of the present invention;
Fig. 8 is the schematic cross sectional views of petrolic autopulse.
Embodiment
Below with reference to accompanying drawing, embodiments of the invention are described.Fig. 1 has shown one embodiment of the present of invention to Fig. 6, and Cu-Ni-Zn-C base or Cu-Sn-C based raw material can be as the raw materials of this sintered alloy body.In addition, the example of above-mentioned bearing 5 as the sintered alloy body used in following explanation.Shown in Fig. 2 and 3, bearing 5 is by being that columniform sintered alloy body forms haply.Erosion resistance with the Cu-Ni-Zn alloy that constitutes body material, proof has excellent erosion resistance in the time of in being exposed to high-voltage high-speed gasoline environment.Have excellent work-ing life when in addition, a kind of oil-fuel pump that uses this graphite based on dispersed copper sintered bearing contains the oil fuel of sulphur or its compound in using its impurity.
In order further to improve erosion resistance of the present invention, sintered alloy body 51 is carried out electroplating processes (S4) in sintering processes (S3) back.In electroplating processes (S4), the thickness that contains tin (Sn) is that about 2 to 25 microns electrolytic coating 53 forms on the outside surface of sintered alloy body 51 by plating and similar technology.
After electroplating processes, bearing 5 carries out pressure-sizing and is subjected to recompression (S5) and obtains predetermined size.As example, Fig. 4 has shown a kind of mold pressing correction device 11 that is used for pressure-sizing.This mold pressing correction device 11 adopts vertical direction as axial (vertical axis compression direction), and has been equipped with mould 12, mandrel 13, lower punch 14 and upper punch 15.Mould 12 has the shape of approximate cylinder, the mandrel 13 coaxial moulds 12 that are positioned at of approximate cylinder.Lower punch 14 has the shape of approximate cylinder, and it is bonded between mould 12 and the mandrel 13 so that freely move up and down from following beginning.Upper punch 15 has the shape of approximate cylinder, and it is bonded between mould 12 and the mandrel 13 so that freely move up and down from top beginning.As shown in Figure 4, above-mentioned bearing 5 is arranged in the mould 12, and mandrel 13 inserts and is positioned on the sliding surface 52 that forms bearing 5 through holes.From last and compress, bearing 5 is corrected to predetermined size by upper and lower drift 15 and 14 from below.
In order determining before the pressure-sizing and the situation of pressure-sizing electrolytic coating 53 afterwards, to have made a plurality of sintered alloy bodies 51, and obtained the enlarged image of its structure.In the reality, under identical condition, formed 20 sintered alloy bodies 51 by electroplating processes, to half, 10 in other words, sintered alloy body 51 carries out pressure-sizing.
These 10 sintered alloy bodies 51 are cut open then, as shown in Figure 3, obtain the enlarged image of sliding surface 52 structures.The result is, 10 sintered alloy bodies 51 that do not carry out pressure-sizing, and tin coating 53 is about 10 microns at the mean thickness of sliding surface 52, at 10 sintered alloy bodies 51 that carry out pressure-sizing, the mean thickness of tin coating 53 is about 6 microns.In this mode, because tin coating rolls, pressure-sizing makes the thickness attenuation of tin coating 53, and the opening portion 54A of pore 54 is partly stopped up by the calendering of tin coating 53,
In not carrying out the sintered alloy body 51 of pressure-sizing, as shown in Figure 5, the pore 54 with opening portion 54A is positioned at sliding surface 52, has shown the not satisfied position of plating plugging hole.In addition, observe at the outside surface of tin coating 53 and have irregular surface.These irregular surfaces are because the variation of tin coating 53 thickness causes.
On the contrary, in having carried out the sintered alloy body 51 of pressure-sizing, as shown in Figure 6, the pore with opening portion 54A 54 that is positioned at sliding surface 52 is stopped up by tin coating 53.Simultaneously, there is not irregular surface in the outside surface at tin coating 53.
In this mode, after plating, carry out pressure-sizing (S5), because the calendering of compression tin coating 53 and tin coating, the pore 54 on sintered alloy body 51 outside surfaces is stopped up by tin coating 53, therefore the lining that has improved tin coating 53.In addition, pressure-sizing (S5) makes the outer surface smoother of tin coating 53, and tin coating 53 can also finishing arrive very homogeneous thickness simultaneously.
In this way, in the present embodiment, because the formation of sintered alloy body 51 is the raw material powders that contain copper by molded and sintering, tin coating 53 forms on sintered alloy body 51, then the bearing 5 that has tin coating 53 is carried out pressure-sizing, can obtain the bearing 5 that forms by the sintered alloy body, have excellent erosion resistance.
Especially, in conjunction with zinc-plated, bearing 5 can have anti-sulphur and compound corrosion and anti-formic acid, acetate and other organic acid corrosive performances by copper base sintered alloy.In addition, carry out pressure-sizing, comprise that the size of the product of tin coating 53 can arrive within the predetermined scale error in finishing owing to have the sintered alloy body 51 of tin coating 53.In addition, because tin coating 53 compresses by pressure-sizing, make tin coating 53 form very homogeneous thickness simultaneously, the tin coating 53 of compression has sealed the pore on the outside surface of sintered alloy body 51.Therefore caused the good lining of tin coating 53.
In addition, above-mentioned sintered alloy body can be a sliding part, and as bearing 5, resulting bearing has anti-sulphur and compound corrosive performance and anti-formic acid, acetate and organic acid corrosive performance.
In this way, in an embodiment of the present invention,, the sintered alloy body that obtains is carried out zinc-plated, carry out pressure-sizing then because the formation of sintered alloy body 51 is the raw materials that contain copper by molded and sintering; Tin coating 53 is compressed in the pressure-sizing process, tin coating forms very homogeneous thickness, be compressed in pressure-sizing owing to described tin coating 53 simultaneously, pore 54 on sintered alloy body 51 outside surfaces is stopped up by tin coating 53, therefore pressurized tin coating 53 has sealed the hole of sintered alloy body 51 outside surfaces, the lining that has improved tin coating 53.In addition, carry out pressure-sizing, can finishing arrive within the predetermined scale error with tin coating 53 bonded product sizes owing to have the sintered alloy body 51 of tin coating 53.In addition, in conjunction with zinc-plated, the sintered alloy body that obtains has anti-sulphur and compound corrosion and anti-formic acid, acetate and organic acid corrosive performance by the copper base sintered alloy body.
In this way, in an embodiment of the present invention, because bearing 5 is formed by sintered alloy body of the present invention, the bearing 5 of electric fuel pump has excellent work-ing life for containing sulphur and compound thereof or formic acid, acetate and organic acid oil fuel.
Fig. 7 has shown the second embodiment of the present invention.In the introduction, for using identical mark with the above-mentioned first embodiment corresponding components, and omitted detailed description thereof, in this example, because the sintered alloy body 51 that sintering processes (S3) is obtained had carried out pressure-sizing (S6) before electroplating, carry out above-mentioned electroplating processes (S4) at finishing sintered alloy body 51 after predetermined size.Come precompressed sintered alloy body 51 by carried out pressure-sizing before electroplating processes, the sintered alloy body can have higher dimensional precision.
In addition, the present invention is not limited to the foregoing description, and the present invention can carry out various variations.For example, the present invention can use different raw material powders, as long as it contains copper or copper alloy, and is not limited to top described.In addition, bearing is not limited among the embodiment to be introduced, and the present invention can be applied to the bearing of different shape.In addition, it is bearing that sliding part also is not limited to, but the present invention may be used on all kinds sliding part, as long as this sliding part has slipper.
The formation of sintered alloy body of the present invention is the raw material powder that contains copper by molded and sintering, obtaining forming tin coating on the sintered alloy body, then the sintered alloy body that has tin coating is carried out pressure-sizing, the sintered alloy body that obtains has anti-sulphur and compound corrosion and anti-formic acid, acetate and organic acid corrosive performance.In addition, carry out pressure-sizing, comprise that the size of the product of tin coating can arrive in the predetermined scale error scope in finishing owing to have the sintered alloy body of tin coating.
When above-mentioned sintered alloy body was sliding part, sliding part had anti-sulphur and compound corrosion and anti-formic acid, acetate and organic acid corrosive performance.
In the production method of sintered alloy body of the present invention, the formation of sintered alloy is the raw material powder that contains copper by molded and sintering, obtaining forming tin coating on the sintered alloy body, then the sintered alloy body that has tin coating is carried out pressure-sizing, wherein tin coating is compressed in the pressure-sizing process, formed tin coating forms very homogeneous thickness simultaneously, described tin coating is compressed in pressure-sizing, pore on the sintered alloy external surface is stopped up by described tin coating, so the tin coating that makes compression has sealed the pore on the sintered alloy external surface, the lining that has improved tin coating.
Autopulse of the present invention comprises the bearing that is formed by above-mentioned sintered alloy body, and for containing sulphur and compound thereof and formic acid, acetate and organic acid oil fuel, it has excellent work-ing life.

Claims (4)

1. sintered alloy body can contain the raw material powder of copper by molded and sintering, then the sintered alloy body that obtains is provided with tin coating, thereafter the sintered alloy body that has described tin coating is carried out pressure-sizing and obtains.
2. sintered alloy body according to claim 1 is characterized in that, described sintered alloy body is a sliding part.
3. the production method of a sintered alloy body comprises: the raw material powder that molded and sintering contains copper forms the sintered alloy body, described sintered alloy body is carried out zinc-plated, is pressure-sizing then.
4. an electric fuel punp comprises the bearing that the described sintered alloy body of claim 1 forms.
CN03103464A 2002-01-29 2003-01-27 Sintered alloy, its production method, electric fuel pump comprising sintered alloy bearing Pending CN1435498A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP20719/2002 2002-01-29
JP2002020719A JP2003221605A (en) 2002-01-29 2002-01-29 Sintered alloy, manufacturing method therefor and motor type fuel pump with bearing consisting of sintered alloy

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Publication Number Publication Date
CN1435498A true CN1435498A (en) 2003-08-13

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US (1) US20030143096A1 (en)
JP (1) JP2003221605A (en)
CN (1) CN1435498A (en)
DE (1) DE10303051A1 (en)

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