Special lubricating and wear-resistant coating for engine bearing bush coating and preparation method thereof

Abstract

The invention discloses a lubricating and wear-resistant paint specially used for coating engine bearing bushes and a preparation method thereof. The lubricating and wear-resistant paint comprises: 20-40% of composite solid lubricating material, 12-15% of composite wear-resistant material, and a composite Binder 20-30%, auxiliary agent 0.1-0.5%, solvent 20-40%. The composite solid lubricating material is composed of nano-molybdenum disulfide, polytetrafluoroethylene, graphene and carbon nanotubes; the composite wear-resistant material is composed of silicon nitride, calcium fluoride and silicon carbide; the composite binder is high Molecularly modified epoxy polyether fluororesin is composed of polymer modified epoxy resin, epoxy modified fluororesin and polyethersulfone resin. The bearing pad coated with special lubricating and wear-resistant paint for the engine bearing pad of the present invention improves the performance of the bearing pad such as lubricity, wear resistance, running-in performance, anti-occlusion, fatigue resistance, and load-carrying capacity, and meets the expected requirements. It ensures the reliability and service life of the engine bearing during use.

Description

technical field [0001] The invention relates to the technical field of wear-resistant lubricating materials for engine bearings, in particular to a special lubricating and wear-resistant coating for engine bearings and a preparation method thereof. Background technique [0002] The engine bearing bush is the part where the sliding bearing and the journal are in contact. It is shaped as a tile-like semi-cylindrical surface and is very smooth. It is generally made of bronze, alloy and steel-backed composite copper or aluminum. The bearing bush and the journal adopt a clearance fit or intermittent contact, and generally do not rotate with the shaft. The traditional bearing pad is coated with a layer of protective layer on the inner surface of the bearing pad by electroplating process, which has the functions of lubrication, wear resistance, anticorrosion and beauty. For example, in order to meet the operating conditions of the engine bearing, a layer of lubricating and wear-re...

AI Technical Summary

Problems solved by technology

Simultaneously, the requirements for the service life of the engine bearings are also greatly improved. The bearing coatings disclosed in the above-mentioned existing patents CN103710116A, CN104120001A and CN103216530A can no longer meet the requirements of wear resistance and service life.

For example, the patent CN103710116A uses oil film lubrication, which is a supplement to the original lubrication defects. The main component of the lubrication is lubricating oil, which cannot achieve self-lubrication; the patent CN104120001A uses a lubricant containing molybdenum disulfide to greatly improve the lubrication properties, but Its wear resistance is poor. Although lubrication and wear resistance are two concepts, they always exist together. The quality of lubrication affects the effect of wear resistance, but it cannot determine the result of wear resistance. Therefore, it needs to be added to its formula design. Appropriate wear-resistant materials to truly achieve the ideal effect of both lubrication and wear resistance

And although the patent CN103216530A lists all the components that may be used, and occasionally also states the proportions, it is not easy to realize in the actual formula design, and the antifriction coating disclosed by it has gradually been unable to meet the requirements of engine bearing bushes and bushings. Use requirements for lubricity and wear resistance of wear-resistant parts

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