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Method for manufacturing multi-scale structure aluminum/stannum-based bearing alloy

A technology of tin-based bearing alloy and manufacturing method, which is applied in the field of manufacturing multi-scale structure aluminum-tin-based bearing alloy, can solve problems such as sintering of Al-Sn alloy powder, achieve improved friction and wear performance, overcome limitations, and enhance mutual coordination effect

Inactive Publication Date: 2011-07-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome and solve the shortcomings existing in the existing technology of preparing aluminum-tin-based bearing alloys, and focus on solving the problem of powder sintering of Al-Sn alloys, the invention provides a method for manufacturing aluminum-tin-based bearing alloys with multi-scale structures

Method used

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  • Method for manufacturing multi-scale structure aluminum/stannum-based bearing alloy
  • Method for manufacturing multi-scale structure aluminum/stannum-based bearing alloy
  • Method for manufacturing multi-scale structure aluminum/stannum-based bearing alloy

Examples

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Effect test

Embodiment 1

[0033] The above-mentioned MA powder and SM powder are prepared according to the mass ratio of 70wt%MA+30wt%SM, and then uniformly mixed to obtain a secondary mixed powder;

[0034] The above-mentioned secondary mixed powder is cold-pressed and formed into blocks by uniaxial pressing, and the pressing pressure is 300KN;

[0035] Vacuum 8×10- 3 Pa, and then heated to 100°C with argon gas and kept for 0.5 hours, then raised to 550°C and kept for 1 hour, then cooled with the furnace.

[0036] Example 2

[0037] The 88wt%Al and 12wt%Sn powders with a purity of 99.9% and a particle size of 200 mesh were ball milled under the protection of argon, the ball mill speed was 250rpm, the ball milling time was 40h, and the ball-to-material ratio was 15:1 to obtain Al-Sn alloy powder Body (MA powder);

Embodiment 2

[0039] The above MA powder and SM powder are uniformly mixed at a mass ratio of 60wt%MA+40wt%SM to obtain a secondary mixed powder;

[0040] The above-mentioned secondary mixed powder is cold-pressed and formed into blocks by uniaxial pressing, and the pressing pressure is 300KN;

[0041] Vacuum 8×10- 2 Pa, and then heated to 100°C with argon gas and kept for 0.5 hours, then raised to 550°C and kept for 1 hour, then cooled with the furnace.

[0042] Example 3

[0043] The 88wt%Al and 12wt%Sn powders with a purity of 99.9% and a particle size of 200 mesh were ball milled under the protection of argon, the ball mill speed was 250rpm, the ball milling time was 40h, and the ball-to-material ratio was 15:1 to obtain Al-Sn alloy powder Body (MA powder);

Embodiment 3

[0045] The above-mentioned MA powder and SM powder are prepared according to the mass ratio of 50%MA+50%SM, and then uniformly mixed to obtain a secondary mixed powder;

[0046] The above-mentioned secondary mixed powder is cold-pressed and formed into blocks by uniaxial pressing, and the pressing pressure is 300KN;

[0047] Vacuum 6×10- 2 Pa, and then heated to 100°C with argon gas and kept for 0.5 hours, then raised to 550°C and kept for 1 hour, then cooled with the furnace.

[0048] Example 4

[0049] The 88wt%Al and 12wt%Sn powders with a purity of 99.9% and a particle size of 200 mesh were ball milled under the protection of argon, the ball mill speed was 250rpm, the ball milling time was 40h, and the ball-to-material ratio was 15:1 to obtain Al-Sn alloy powder Body (MA powder);

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Abstract

The invention discloses a method for manufacturing a multi-scale structure aluminum / stannum-based bearing alloy, which is characterized in that coarse-crystalline raw mixed powder with the same components is added to mechanical alloying powder having a nano-phase composite structure. The method specifically comprises the steps that: high-purity Al and Sn powders with the grain size about 200 meshes are subjected to high energy ball milling based on certain mass ratio of the Al powder to the Sn powder under the protection of argon, so as to prepare Al-Sn alloy powder with the nano-phase composite structure; the Al and Sn powders are commonly mixed according to the same mass ratio above to obtain the raw mixed powder; the Al-Sn alloy powder is uniformly mixed with the raw mixed powder; the mixed powder is subjected to cold pressing molding to obtain a green compact; and the green compact is sintered under vacuum to prepare the Al-Sn bearing alloy with excellent tribological properties. The aluminum / stannum-based bearing alloy of the invention has a multi-scale structure, remarkably improved density and abrasive resistance, increased adjustable extent of hardness and high matching degree with shafts.

Description

technical field [0001] The invention relates to the technical field of preparing an aluminum-tin-based bearing alloy by mechanical alloying, in particular to a method for manufacturing an aluminum-tin-based bearing alloy with a multi-scale structure. Background technique [0002] Aluminum-based bearing alloys have the advantages of excellent surface properties, good thermal conductivity, small specific gravity and high fatigue resistance, and are widely used in the field of manufacturing automotive engine bearings. Aluminum-based bearing alloys mainly refer to Al-Sn series and Al-Pb series alloys. In recent years, with the improvement of people's awareness of environmental protection and the advancement of "lead-free" in industrial fields around the world, Pb, as a heavy metal that pollutes the environment, will gradually be banned from being used in large quantities in industrial production. Therefore, Al-Sn series bearing alloys, as a promising bearing material, have grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C21/00
Inventor 朱敏鲁忠臣曾美琴舒小飞王辉高岩
Owner SOUTH CHINA UNIV OF TECH
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