Preparation method of self-lubricating composite material

Abstract

The invention discloses a preparation method of a self-lubricating composite material. The preparation method comprises the following steps: respectively weighing aluminum oxide dispersion strengthened copper powder and copper-coated graphite powder according to a set mass percentage ratio; performing high-energy ball milling on two weighed powders in a ball mill, and fully and uniformly mixing to obtain a mixed material under the condition that the mixing time is not less than 1 hour; pressing the obtained mixed material into blocks at 200-300MPa, and maintaining pressure for 5-10 minutes; putting briquettes obtained by virtue of pressing into a sintering furnace, performing initial sintering and molding, then performing re-pressing treatment, and then performing re-sintering again; and then naturally cooling to 80 DEG C to obtain the self-lubricating composite material. By adopting the preparation method disclosed by the invention, the problems that a copper-based graphite composite material is poor in interface bonding force, and graphite and copper are poor in wettability can be solved, and the high-temperature strength, heat conduction performance and tribological performance of the copper-based graphite composite material can be improved.

Description

technical field [0001] The invention relates to the technical field of lubricating materials, in particular to a method for preparing a self-lubricating composite material. Background technique [0002] At present, copper-graphite composite material is a composite material composed of copper matrix and graphite particles, which has the excellent properties of copper matrix, such as high strength, fast heat conduction, good electrical conductivity, arc ablation resistance, etc., and has good lubrication performance of graphite. In particular, it has the characteristics of good lubricating performance at high temperature. Its comprehensive performance is excellent, and it is an ideal material for preparing modern self-lubricating friction parts and electrical contact conductive parts. It is widely demanded in the fields of mechanical transmission, transportation, military, aerospace and other fields. [0003] However, in the existing technical solutions, when it is close to t...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of self-lubricating composite material preparation method, this method has overcome the problem that the interfacial binding force of copper-based graphite composite material is weak and graphite and copper wettability is poor, has improved the high-temperature strength of copper-based graphite composite material, Thermal (electrical) conductivity and wear resistance

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