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Method for preparing Cu-Sn-Bi bearing alloy by discharge plasma assisted ball-milling

A technology of discharge plasma and bearing alloy, which is applied in the field of preparation of Cu-based sliding bearing materials, can solve problems such as difficult guarantees, achieve high load-carrying capacity, realize strength and plasticity, and improve the effect of uneven distribution

Active Publication Date: 2017-08-08
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] CN 101970701B patent discloses a manufacturing method of sintered copper alloy sliding material. In this patent, in the Cu-Bi-In sliding material, the sinterability and wear resistance of the alloy are improved by forming a Bi soft phase as pure as possible , but the distribution of the Bi phase in the alloy prepared by the invention depends on the uniformity of the original powder, which is difficult to guarantee in actual operation

Method used

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  • Method for preparing Cu-Sn-Bi bearing alloy by discharge plasma assisted ball-milling
  • Method for preparing Cu-Sn-Bi bearing alloy by discharge plasma assisted ball-milling
  • Method for preparing Cu-Sn-Bi bearing alloy by discharge plasma assisted ball-milling

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Embodiment 1

[0036] Such as figure 1 As shown, the steps of the method for preparing Cu-Sn-Bi bearing alloys by discharge plasma assisted ball milling in this embodiment are as follows:

[0037] Cu powder with a particle size of 10 to 60 μm and a purity of 99.9%, Sn powder with a particle size of 10 to 50 μm and a purity of 99.5%, Bi with a particle size of 10 to 50 μm and a purity of 99.99% were calculated as Cu-10% Sn -3%Bi mass percentage is simply and uniformly mixed, and the mixed powder is refined and activated by using a discharge plasma assisted ball mill under the protection of argon to obtain a Cu-10%Sn-3%Bi supersaturated solid solution alloy with a sheet structure powder. The adopted rotating speed is 960rpm, the discharge current is 1.5A, the ball-material ratio is 30:1, and the ball milling time is 5h. The powder is in the form of flakes with a size of 20 μm.

[0038] Weigh 9 g of the above-mentioned Cu-10%Sn-3%Bi supersaturated solid solution alloy powder and put it into ...

Embodiment 2

[0042] The procedure of this embodiment is basically the same as that of Embodiment 1, except that the recrystallization annealing temperature selected for the cold-rolled sample is 700°C.

Embodiment 3

[0044] The steps of this embodiment are basically the same as those of Embodiment 1, except that the recrystallization annealing temperature selected for the cold-rolled sample is 750°C.

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Abstract

The invention discloses a method for preparing a Cu-Sn-Bi bearing alloy by discharge plasma assisted ball-milling. The method comprises the following steps of: mixing Cu, Sn and Bi original powder in certain percentage by weight; then, obtaining Cu-Sn-Bi supersaturated solid solution alloy powder through discharge plasma assisted ball-milling; and performing pre-cold-pressing, sintering, cold-rolling and recrystallizing-annealing on the alloy powder, thereby preparing the Cu-Sn based bearing alloy which is approximately to be fully compact. The Cu-Sn-Bi alloy prepared by the method has relatively high compactness, tensile strength and plasticity, and has relatively good wear resistance and friction reduction. The method solves the key problems such as difficulty sintering and non-compactness generated in preparing the Cu-Sn based bearing alloy by powder sintering, and is beneficial for realizing industrial production.

Description

technical field [0001] The invention relates to a preparation method of a Cu-based sliding bearing material, in particular to a method for preparing a Cu-Sn-Bi bearing alloy by discharge plasma assisted ball milling. Background technique [0002] The Cu-based sliding bearing material is a composite material made of Cu alloy as the matrix, adding lubricating and anti-friction components, and using casting methods, powder metallurgy and other technologies. The most widely used strengthening component in Cu-based bearing materials is Sn. On the one hand, Cu and Sn can form a solid solution to produce solid solution strengthening, which is beneficial to improve the hardness and strength of the alloy; on the other hand, the Cu-Sn solid solution can also weaken the corrosion of S-containing compounds in lubricating oil. The most widely used lubricating component in Cu-based bearing materials is Pb, but Pb is a harmful element. Long-term use of Pb-containing bearings will inevitab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C9/02C22C1/04C22F1/08B22F9/04
Inventor 朱敏陈可曾美琴鲁忠臣宋凯强
Owner SOUTH CHINA UNIV OF TECH
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