A kind of anti-friction copper base bimetallic bearing material and its manufacturing method

Abstract

The invention discloses a friction-reducing copper-based bimetallic bearing material and a manufacturing method thereof. The steel plate is used as a base body, and a copper-based alloy friction-reducing layer is formed on the surface of the steel plate. The copper-plated graphite, copper-plated molybdenum disulfide and Bismuth is used as the lubricating component, copper is used as the base material, and nickel, tin and phosphorus are added, and the copper-steel bimetal bearing material is prepared by sintering in the steel plate. The invention synergistically exerts the excellent anti-friction properties of molybdenum disulfide and graphite and the anti-adhesion effect of bismuth element, and the friction coefficient of the material can reach 0.10-0.15; the obtained bearing material has good anti-friction and wear resistance, does not contain toxic element lead, and is environmentally friendly. any contamination.

Description

technical field [0001] The invention relates to the field of lead-free copper-based sliding bearing materials, in particular to a multi-lubricating component copper-based bimetallic bearing material and a manufacturing method thereof. Background technique [0002] Both molybdenum disulfide and graphite are good solid lubricants. The crystal structure of graphite determines that it has a strong adsorption capacity on the crystal surface, and at the same time, it can also absorb moisture in the air to form a layer of graphite water film, which together with the oxide film forms a lubricating film, which has a good lubricating effect. However, the lubricating effect of graphite is dominated by the adsorbed gas. When the adsorbed gas disappears, the lubricating effect is lost, that is, the lubricating effect of graphite disappears in vacuum. In contrast, molybdenum disulfide still has excellent properties such as small friction coefficient, good thermal stability, high yield st...

AI Technical Summary

Problems solved by technology

[0004] However, the wettability of graphite and copper substrate is poor, the interface bonding quality is poor, there are pores at the interface junction, the matrix is ​​severely split, and the mechanical and tribological properties of the material are weakened; molybdenum disulfide is easily oxidized and decomposed during high temperature sintering, resulting in sulfide weaken the mechanical properties of the material

Introducing the element bismuth into the copper-based bearing material can also play a role in reducing friction and anti-adhesion. However, the hardness of bismuth is slightly higher than that of lead, and the ductility is also slightly worse than that of lead, so its anti-friction and anti-adhesion performance is weaker than that of lead. At the same time, because bismuth, a low-melting-point component, is easy to distribute in the grain boundary of the copper alloy matrix in the form of thin sheets, when the content of bismuth is high, the aggregation of more brittle phases will easily make it fall off the matrix directly, thereby reducing the friction-reducing and anti-friction properties of bismuth. Adhesion, so bismuth content is somewhat constrained