Copper-based bearing pad with toughening interlayer and preparation method of copper-based bearing pad

Abstract

A copper-based bearing pad with a toughened intermediate layer and a preparation method thereof. The bearing pad includes a copper shell, a toughened intermediate layer and a tin-based bearing alloy layer. The preparation method of the bearing pad includes: preparing a copper shell and a tin-based bearing alloy; The surface of the copper shell is degreased, mechanically sandblasted and roughened, cleaned with lye to remove surface oil stains and oxide films, cleaned with absolute ethanol, and then activated with acid to activate the surface of the copper shell; on the inner surface of the treated copper shell Form a toughened intermediate layer with a thickness of 30-100 μm, the composition of the toughened intermediate layer is pure nickel; cast a tin-based bearing alloy layer on the toughened intermediate layer, and set uniform grooves on the inner wall of the tin-based bearing alloy layer , the depth of the groove is 1/5~1/3 of the thickness of the tin-based bearing alloy; finally, cryogenic treatment is carried out on the bearing bush. The present invention avoids the generation of Cu6Sn5 brittle phase from reaction at the joint surface of the tin-based bearing alloy and the copper shell by setting the toughening intermediate layer, thereby improving the bonding strength between the tin-based bearing alloy and the copper shell.

Description

technical field [0001] The invention relates to the technical field of bearing bushes, in particular to a copper-based bearing bush with a toughened intermediate layer and a preparation method thereof. Background technique [0002] Bearing bush is one of the important parts of internal combustion engine. Its performance and structure not only affect the performance, reliability and life of the internal combustion engine, but also affect the structural design of the internal combustion engine itself. With the rapid development of the transportation industry, the The development of power, low energy consumption, light weight, high boost and environmental protection has put forward higher requirements for bearing bushes, which are one of the important parts of internal combustion engines, such as: high fatigue strength, good wear resistance, good seizure resistance, Good corrosion resistance, good mosaic, good compliance and environmental protection. At present, there are main...

AI Technical Summary

Problems solved by technology

For copper-based bearings, because the tin-based bearing alloy reacts with the copper bonding surface, it is easy to form Cu 6 sn 5 Brittle phase, so the bonding strength between tin-based bearing alloy and copper is poor (not higher than 30Mpa), it is difficult to cast directly on the copper shell, and it cannot be firmly bonded to the copper shell by adding a tin transition layer

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