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Method for producing nano Al-Sn-Si bearing alloy
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A technology for bearing alloys and manufacturing methods, which is applied in the field of manufacturing nanocomposite aluminum-tin-silicon bearing alloys, can solve the problems of insufficient mechanical properties of Al-Sn alloys, unstudied sintering properties and mechanical properties, and low sintering strength, etc., to achieve improved bearing capacity Ability and anti-seizure performance, eliminate network distribution, overcome the effect of Sn phase coarseness
Active Publication Date: 2013-07-24
SOUTH CHINA UNIV OF TECH
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[0003] The patent application document with the publication number CN 01107648.8 discloses a method for preparing an aluminum-lead nano-micro alloy. The method is to use the powder prepared by high-energy ball milling to obtain an Al-Pb alloy through a recompression and refiring process, but the invention Mainly to improve the friction and wear properties of Al-Pb alloys, and did not study its sintering properties and mechanical properties
However, since Al-Sn is more difficult to sinter than Al-Pb alloys, the sintering strength is not high, resulting in insufficient mechanical properties of pure Al-Sn alloys.
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Embodiment 1
[0029] Such as figure 1 . 80wt% Al and 20wt% Sn powder with a purity of 99.9% and a particle size of 200 meshes were ball milled under the protection of argon, the speed of the ball mill was 250rpm, the ball milling time was 40h, and the ball-to-material ratio was 15:1;
[0030] The prepared ball mill powder is pressed into blocks by uniaxial pressing, and the pressing pressure is 660MPa;
[0031] Then put the pressed block into the vacuum sintering furnace and vacuumize to 8×10 -3 Pa, then pass in argon to raise the temperature to 100°C and keep it for 1 hour, then raise the temperature to 550°C and keep it for 1 hour, then cool with the furnace.
Embodiment 2
[0033] Such as figure 2 . Ball mill the 88wt%Al and 12wt%Sn powder with a purity of 99.9% and a particle size of 200 mesh under the protection of argon. The ball mill speed is 350rpm, the ball milling time is 30h, and the ball-to-material ratio is 15:1;
[0034] The prepared ball mill powder is pressed into blocks by uniaxial pressing, and the pressing pressure is 660MPa;
[0035] Then put the pressed block into the vacuum sintering furnace and vacuumize to 8×10 -3 Pa, then pass in argon to raise the temperature to 100°C and keep it for 1 hour, then raise the temperature to 550°C and keep it for 1 hour, then cool with the furnace.
Embodiment 3
[0037] Such as Figure 5 , 6 . Ball mill the Si powder with a purity of ≥99.9% and a particle size of 200 mesh under the protection of argon; the speed of the ball mill is 250 rpm, and the ball milling time is 2 hours to obtain Si powder with uniform particle size and fine dispersion;
[0038] The 0.5wt% Si powder obtained by the above ball milling with a purity of 99.9%, a particle size of 200 mesh, 87.5wt%Al, 12wt%Sn and 0.5wt%Si powder was ball milled under the protection of argon. The ball mill speed was 350rpm, and the ball milling time was 30h. is 15:1;
[0039] The pressing and sintering process is the same as in Example 2.
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Abstract
The invention relates to a method for producing nano Al-Sn-Si bearing alloy, which comprises the follow steps: crushing high-purity Si powder by a ball mill under the protection of argon gas to obtain dispersive Si powder; crushing high-purity Al powder and Sn powder and the Si powder by weight percent of Al, Sn and Si by the ball mill under the protection of argon gas to obtain MA Al-Sn-Si alloypowder with a nanophase composite structure; forming the MA Al-Sn-Si alloy powder by cold pressing; and sintering and then cooling the MA Al-Sn-Si alloy powder. On one hand, addition of Si phase breaks the oxide layers on the surfaces of Al power particles by formation of Al-Si eutectic phase to promote metallurgical bonding, and on the other hand, dispersive Si phase restrains Sn phase reticulartissues caused by divorced eutectic and Sn phase dimension increase. Nanocrystal hard Si particles and soft Sn particles obtained by the method for producing nano Al-Sn-Si bearing alloy are evenly and diffusely distributed in the high-strength Al substrate, thereby effectively enhancing the performance of the alloy.
Description
technical field [0001] The invention relates to mechanical alloying synthetic material technology, in particular to a manufacturing method of a nanocomposite aluminum-tin-silicon bearing alloy. Background technique [0002] Aluminum-based alloys have become one of the main materials for medium and light-load engine sliding bearings due to their high mechanical properties, thermal conductivity, and good corrosion resistance, as well as abundant resources and low prices. With the development of the automobile industry, the continuous strengthening and improvement of the performance of automobile engines, and the advancement of "lead-free" in the bearing alloy industry, Si has become another most promising additive element after Sn in Al-based bearing alloys. Al-Sn-Si series bearing alloy materials were first successfully developed by Japan in the early 1980s. It uses the dispersed distribution of Si particles in the Al-Sn matrix to effectively improve the fatigue strength of ...
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