Method for coating bearing bush steel backing with Babbitt metal coating

Abstract

The invention relates to the technical field of preparation and repair of sliding bearing Babbitt metal anti-friction layers. The novel cold spraying technology is introduced into manufacturing and repair remanufacturing of a Babbitt metal sliding bearing bush lining anti-friction layer, atomization powder feeding is adopted to obtain coating microstructures with uniform components and fine dispersely-distributed and uniformly-dense crystal grains and second phases through cold spraying, and the good interface bonding characteristic is obtained through tinning layer setting and sprayed thermal treatment; the defects of poor structure uniformity, thermal impact, stress, cracking and oxidizing burning losses existing in the technologies such as a traditional casting method, an overlaying method and a thermal spraying method are overcome, the bearing bush component preparation quality and level are improved, the bush burning frequency is decreased, stopping supercritical vibration is lowered, the stability, accuracy and reliability of a bearing transmission unit are improved, and the service life of the bearing transmission unit is prolonged; the method is rapid, efficient and environmentally friendly, is used for bearing bush manufacturing and repair remanufacturing, and has good economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of preparation and repair of a babbitt alloy friction-reducing layer for a sliding bearing, in particular to a method for spraying a babbitt alloy coating on a steel back of a bearing bush. Background technique [0002] Tin-based Babbitt alloy is the key material for manufacturing the friction-reducing layer of the inner lining of large sliding bearing bushes. The quality of the bearing pad mainly depends on the preparation and composite technology of the lining layer; the composition of the alloy layer, the morphology of the second phase and the bonding characteristics of the composite interface are different due to different preparation technologies, resulting in differences in the quality and performance of the bearing pad. Traditional preparation and composite methods mainly include casting method, surfacing welding method, thermal spraying method and so on. The casting method is prone to problems such ...

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Problems solved by technology

The casting method is prone to problems such as element segregation, hard phase segregation, and abnormal growth; in addition, there are problems such as unstable product quality, waste of precious metals, and environmental pollution.

The welding flame temperature of the surfacing welding method is high, the process quality is not easy to accurately control, and it is prone to uneven melting, false welding, virtual welding and other phenomena; there may also be problems such as oxidation, inclusions, pores, etc., which will make the surfacing layer brittle

The spraying temperature of the thermal spraying method is high. When the alloy powder is used for feeding, it is easy to cause the phenomenon of gun sticking and the equipment cannot work continuously; when the alloy wire is used for feeding, in order to avoid brittle fracture, toxic elements such as arsenic and The smelting process is complicated and the pressure of environmental pollution increases

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