CN115156536A - Preparation method of oil distribution disc for multi-stage sintering copper alloy powder layer - Google Patents
Preparation method of oil distribution disc for multi-stage sintering copper alloy powder layer Download PDFInfo
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- CN115156536A CN115156536A CN202210629547.2A CN202210629547A CN115156536A CN 115156536 A CN115156536 A CN 115156536A CN 202210629547 A CN202210629547 A CN 202210629547A CN 115156536 A CN115156536 A CN 115156536A
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- alloy powder
- lead
- sintering
- copper alloy
- copper
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- 238000005245 sintering Methods 0.000 title claims abstract description 75
- 239000000843 powder Substances 0.000 title claims abstract description 43
- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 41
- 238000009826 distribution Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007791 liquid phase Substances 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000007790 solid phase Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 210000003739 neck Anatomy 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 8
- 238000000889 atomisation Methods 0.000 claims description 5
- 238000005204 segregation Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 abstract description 4
- 238000004220 aggregation Methods 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 229910017755 Cu-Sn Inorganic materials 0.000 description 1
- 229910017927 Cu—Sn Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
Images
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
- 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
- B22F3/10—Sintering only
- B22F3/1035—Liquid phase sintering
-
- 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
- B22F3/02—Compacting only
-
- 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
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/006—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of flat products, e.g. sheets
-
- 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
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/08—Distributing valve-gear peculiar thereto
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
Abstract
A preparation method of an oil distribution disc of a multi-stage sintered copper alloy powder layer comprises the following steps of providing copper alloy powder and pressing the copper alloy powder into a blank, wherein the copper alloy powder contains copper, tin and lead. And (3) putting the blank into a sintering furnace for sintering, and rapidly heating the sintering furnace to the melting point of the lead. Slowly raising the temperature to the liquid phase sintering temperature, and fully performing liquid phase sintering. And raising the temperature to the solid phase sintering temperature at a normal temperature raising speed. Heating to 810-860 deg.C, holding for 10-30 min, and solid-phase sintering. Through the multistage sintering process, liquid phase sintering is carried out firstly, and liquid lead is used as an intermediate medium to play a role in conveying. And then heating to a solid phase sintering temperature at a normal heating speed, wherein before the lead is accumulated and grows, the copper-tin alloy firstly forms a net structure, the formed net is fine and compact, the liquid lead is separated in the net to limit the flow and accumulation of the liquid lead, the accumulation and growth of the lead are avoided, and the metallographic crystalline grains of the sintered product are fine, and the lead particles are fine and uniformly distributed.
Description
Technical Field
The invention relates to the technical field of oil distribution disc manufacturing, in particular to a preparation method of an oil distribution disc with a multi-stage sintered copper alloy powder layer.
Background
The oil distribution disc plays a role in distributing high and low oil paths in a hydraulic motor or a pump, so that high-pressure oil in the motor or the pump outputs torque when acting, and high-pressure oil in a plunger cavity stopping outputting the torque when oil is low-pressure (oil return) is discharged. When the oil distribution disc is used, the oil distribution disc is installed on the end face of the cylinder body and attached to the end face of the cylinder body, but when the oil distribution disc works, the end face of the cylinder body and the attached end face of the oil distribution disc can rotate, so that the end face of the cylinder body and the end face of the oil distribution disc are abraded, and a copper layer can be sintered on the oil distribution disc or a gasket with the copper layer is arranged to improve the abrasion resistance and the service life of the oil distribution disc in the prior art. For example, in patent No. CN202011402129.7, a copper-based powder metallurgy plunger pump oil distribution disc material and a preparation method thereof are disclosed, wherein nickel, tin, lead, a binder, a lubricant and the balance of copper powder are uniformly mixed to obtain copper-based mixed powder, and then sintering is carried out, wherein the sintering temperature is 860-920 ℃, and the sintering time is 40-60 minutes. However, the metallographic structure of the copper layer of the oil distribution disc formed by direct one-step sintering is coarse in grains, and the lead and pore distribution of the copper layer are not uniform, so that the wear resistance is not high.
Disclosure of Invention
In view of the above, the present invention provides a method for preparing an oil distribution disc with a multi-stage sintered copper alloy powder layer, so as to solve the above problems.
A preparation method of a oil distribution disc of a multi-stage sintered copper alloy powder layer comprises the following steps:
s1, providing copper alloy powder and pressing the copper alloy powder into a blank, wherein the copper alloy powder contains copper, tin and lead, and the copper alloy powder is selected from copper alloy powder which is free of segregation, fine in internal crystal grains and uniform in element distribution;
s2, placing the blank into a sintering furnace for sintering, wherein the sintering furnace is quickly heated to the melting point of lead of above 327 ℃, keeping the temperature for 5 minutes within the range of 10 ℃, and uniformly distributed lead is fully melted into liquid lead and the copper-tin alloy is still in a solid state;
s3, slowly heating to a liquid phase sintering temperature, fully performing liquid phase sintering, dissolving the small-crystal-grain copper-tin alloy in liquid lead, conveying the small-crystal-grain copper-tin alloy to the surface of large particles through the liquid lead, and precipitating to form a sintering neck;
s4, heating to the solid phase sintering temperature at a normal heating speed, wherein in the heating process, crystal grains begin to grow, a large number of sintering necks begin to grow, a continuous network structure begins to form, and liquid lead is separated in a grid;
s5, heating to 810-860 ℃, preserving heat for 10-30 minutes, and leading solid phase sintering;
and S6, processing the sintered plate into a gasket-shaped product according to different requirements.
Further, in the step S3, the temperature is slowly raised to the liquid phase sintering temperature of 550-650 ℃.
Further, in the above step S4, the temperature is raised at the normal temperature raising rate to the solid-phase sintering temperature 798 ℃.
Further, in the step S1, the copper alloy powder is obtained by atomization.
Further, in the step S1, the copper alloy powder is pressed into a blank by loose sintering, rolling and secondary sintering.
Compared with the prior art, the preparation method of the oil distribution disc of the multi-stage sintered copper alloy powder layer provided by the invention obtains the segregation-free copper alloy powder through atomization, mainly, the lead element has no segregation, so that the lead is uniformly distributed inside and outside the copper powder, the phenomenon of internal and external non-uniformity is avoided, and the gold phase of the copper layer after sintering is good. Meanwhile, during sintering, a multi-section sintering process is adopted, liquid phase sintering is firstly carried out, so that liquid lead is used as an intermediate medium to play a conveying role, namely, small-grain copper-tin alloy is dissolved in lead liquid and conveyed to the surface of large particles through the lead liquid to be precipitated to form sintering necks, and the whole process is slowly heated, so that more sintering necks are formed as far as possible to increase the bonding strength. And then heating to the solid phase sintering temperature at a normal heating speed, wherein before the lead is aggregated and grown, the copper-tin alloy firstly forms a net structure, and the formed grid is fine and compact, so that the liquid lead is separated in the grid to limit the flow and aggregation of the liquid lead, and the phenomenon of aggregation and growth of the lead is avoided. And finally, continuously heating and sintering after the grid is formed, so that the bonding strength is improved, and finally, the metallographic crystal grains and the lead particles of the sintered product are fine and uniformly distributed.
Drawings
Fig. 1 is a flow chart of a method for preparing an oil distribution disc of a multi-stage sintered copper alloy powder layer provided by the invention.
FIG. 2 is a binary phase diagram of Cu-Pb.
FIG. 3 is a binary phase diagram of Cu-Sn.
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
Fig. 1 to 3 show a flow chart of a method for manufacturing an oil distribution pan for a multi-stage sintered copper alloy powder layer according to the present invention.
The preparation method of the oil distribution disc of the multi-stage sintered copper alloy powder layer comprises the following steps:
the method comprises the following steps of S1, providing copper alloy powder and pressing the copper alloy powder into a blank, wherein the copper alloy powder contains copper, tin and lead, the copper alloy powder is free of segregation, fine in internal crystal grains and uniform in element distribution, and the copper alloy powder is obtained in an atomization mode. The copper alloy powder is pressed into a blank by adopting a loose sintering, rolling and secondary sintering mode.
And S2, placing the blank into a sintering furnace for sintering, quickly heating the sintering furnace to the melting point of lead of more than 327 ℃, and preserving the heat for 5 minutes within the range of 10 ℃ so that the uniformly distributed lead is fully melted into liquid lead, and the copper-tin alloy is still in a solid state.
And S3, slowly raising the temperature to the liquid phase sintering temperature, namely 550-650 ℃, and fully performing liquid phase sintering. The liquid phase sintering refers to sintering in which a liquid phase and solid phase particles coexist during sintering, and the liquid phase formed by the low-melting-point lead metal powder is used as a binder to be connected around the high-melting-point powder. At the moment, the liquid lead is used as an intermediate medium to play a role in conveying, namely, the small-grain copper-tin alloy is dissolved in the lead liquid and conveyed to the surface of large particles through the lead liquid to be precipitated, so that a sintering neck is formed. The purpose of the slow temperature increase is to form as many sintering necks as possible, more sintering necks increasing the bonding strength.
And S4, heating to the solid-phase sintering temperature of 798 ℃ at a normal heating speed. In the temperature rise process, crystal grains begin to grow, a large number of sintering necks begin to grow, a continuous net structure begins to form, and liquid lead can be separated into grids, so that before lead aggregation grows, the copper-tin alloy forms the net structure firstly, the formed grids are fine and compact, the lead is separated into the grids to limit the flow and aggregation of the liquid lead, and the phenomenon of lead aggregation growth is avoided.
And S5, heating to 810-860 ℃, preserving the heat for 10-30 minutes, and leading the solid phase sintering. At the moment, the liquid lead can not flow and gather freely, the solid-phase sintering of the copper-tin alloy is fully carried out, the net structure can grow up further, and the bonding strength is greatly improved.
And S6, processing the sintered plate into a gasket-shaped product according to different requirements.
Compared with the prior art, the preparation method of the oil distribution disc of the multi-stage sintered copper alloy powder layer provided by the invention obtains the segregation-free copper alloy powder through atomization, mainly, the lead element has no segregation, so that the lead is uniformly distributed inside and outside the copper powder, the phenomenon of internal and external non-uniformity does not exist, and the gold phase of the copper layer after sintering is good. Meanwhile, during sintering, a multistage sintering process is adopted, liquid phase sintering is carried out firstly, liquid lead is used as an intermediate medium to play a role in conveying, namely small-grain copper-tin alloy is dissolved in lead liquid and conveyed to the surface of large particles through the lead liquid to be precipitated to form sintering necks, and the whole process is slowly heated, so that more sintering necks are formed as far as possible to increase the bonding strength. And then heating to the solid phase sintering temperature at a normal heating speed, wherein before the lead is accumulated to grow, the copper-tin alloy firstly forms a net structure, the formed grid is fine and compact, the liquid lead is separated in the grid to limit the flow and accumulation of the liquid lead, and the phenomenon of accumulation and growth of the lead is avoided. And finally, continuously heating and sintering after the grid is formed, so that the bonding strength is improved, and finally, the metallographic crystal grains and the lead particles of the sintered product are fine and uniformly distributed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (5)
1. A preparation method of an oil distribution disc of a multi-stage sintered copper alloy powder layer comprises the following steps:
step S1, providing copper alloy powder and pressing the copper alloy powder into a blank, wherein the copper alloy powder contains copper, tin and lead, and the copper alloy powder is selected from the copper alloy powder which is free of segregation, fine in internal crystal grains and uniform in element distribution;
s2, putting the blank into a sintering furnace for sintering, rapidly heating the sintering furnace to the melting point of lead above 327 ℃, preserving the heat for 5 minutes within the range of 10 ℃, fully melting the uniformly distributed lead into liquid lead, and keeping the copper-tin alloy in a solid state;
s3, slowly heating to a liquid phase sintering temperature, fully performing liquid phase sintering, dissolving the small-crystal-grain copper-tin alloy in liquid lead, conveying the small-crystal-grain copper-tin alloy to the surface of large particles through the liquid lead, and precipitating to form a sintering neck;
s4, heating to the solid phase sintering temperature at a normal heating speed, wherein in the heating process, crystal grains begin to grow, a large number of sintering necks begin to grow, a continuous network structure begins to form, and liquid lead is separated in a grid;
s5, heating to 810-860 ℃, preserving heat for 10-30 minutes, and leading solid phase sintering;
and S6, processing the sintered plate into a gasket-shaped product according to different requirements.
2. A method of preparing a drip pan for a multi-stage sintered copper alloy powder layer according to claim 1, characterized in that: in the step S3, the temperature is slowly raised to the liquid phase sintering temperature of 550-650 ℃.
3. A method for preparing an oil distribution pan for a multi-stage sintered copper alloy powder layer according to claim 1, characterized in that: in step S4, the temperature is raised to the solid-phase sintering temperature 798 ℃ at a normal temperature raising rate.
4. A method for preparing an oil distribution pan for a multi-stage sintered copper alloy powder layer according to claim 1, characterized in that: in the step S1, the copper alloy powder is obtained by atomization.
5. A method for preparing an oil distribution pan for a multi-stage sintered copper alloy powder layer according to claim 1, characterized in that: in the step S1, the copper alloy powder is pressed into a blank by loose sintering, rolling and secondary sintering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629547.2A CN115156536A (en) | 2022-06-06 | 2022-06-06 | Preparation method of oil distribution disc for multi-stage sintering copper alloy powder layer |
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| CN202210629547.2A CN115156536A (en) | 2022-06-06 | 2022-06-06 | Preparation method of oil distribution disc for multi-stage sintering copper alloy powder layer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4406857A (en) * | 1980-09-26 | 1983-09-27 | Metal Leve S.A. Industria E Comercio | Alloy for antifriction bearing layer and process of forming an antifriction layer on steel supporting strip |
| JPH0835026A (en) * | 1994-07-21 | 1996-02-06 | Taiho Kogyo Co Ltd | Coppery sintered sliding material |
| CN1932067A (en) * | 2006-10-13 | 2007-03-21 | 上海磁浮交通工程技术研究中心 | Copper-base graphite and sintered zirconium composite material and its prepn process and use |
| CN101704104A (en) * | 2009-11-26 | 2010-05-12 | 大连三环复合材料技术开发有限公司 | Manufacturing method of bimetal self-lubricating bearing material |
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-
2022
- 2022-06-06 CN CN202210629547.2A patent/CN115156536A/en active Pending
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Non-Patent Citations (1)
| Title |
|---|
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