Extruded aluminum alloy for oil-free bearing and preparation method of extruded aluminum alloy

Abstract

The invention discloses an extruded aluminum alloy for an oil-free bearing and a preparation method of the extruded aluminum alloy, and belongs to the field of aluminum alloy materials. The extruded aluminum alloy for the oil-free bearing is composed of the following element components in percentage by weight: 2%-3% of Sn, 4%-5% of Cu, 0.1%-0.3% of Fe, 0.05%-0.1% of Si and 0.01%-0.04% of Zn. According to the extruded aluminum alloy, copper is added on the basis of an aluminum-tin bearing alloy, the copper element can be dissolved into a solid solution to reinforce a base body, the surface strength and hardness of the alloy are enhanced under the condition that the good abrasion resistance, fatigue resistance, seizure resistance and embedment performance of the alloy are kept, and thereforethe bearing can be used under the high-speed, high-load and high-temperature conditions; and in addition, according to the alloy, on the basis of the aluminum-tin bearing alloy, the tin content is greatly reduced, the production and manufacturing cost is greatly reduced, the plasticity of the alloy is greatly improved, meanwhile, the reduction amplitude of the yield strength and the tensile strength of the alloy is very small, meanwhile, the time for the alloy to reach the peak hardness is greatly shortened compared with single-stage aging, and the effect of saving energy is achieved.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials, in particular to an extruded aluminum alloy for an oil-free bearing and a preparation method thereof. Background technique [0002] Aluminum alloy has the advantages of small specific gravity, high specific strength and specific stiffness, good machinability, good thermal conductivity, and low price. It is widely used in aerospace, transportation, electronics, petrochemical, and machinery manufacturing industries. [0003] Traditional bearing alloy materials are Babbitt alloy (lead-based or tin-based) and copper-based alloy. Babbitt alloy bearing materials have good embedding, compliance and running-in properties, but their hardness is too low at high temperatures, so they can only be used under low loads. Although the copper-based bearing alloy has high fatigue strength and load-carrying capacity, it has poor embedding, compliance and running-in properties, which may easily cause shaft da...

AI Technical Summary

Problems solved by technology

[0004] The aluminum-tin bearing alloy material commonly used at present contains more tin, which is about 20%, which makes the strength and hardness of the alloy lower, and is mostly suitable for medium-speed and medium-load engine bearings.