Abstract
In order to improve the tribological properties of an engine piston ring and enhance its service life, magnetron sputtering technology and low temperature ion sulphurizing treatment technology were used to prepare CrMoN/MoS2 solid lubricant coating on the surface of an engine piston ring. The morphologies and compositions of the surface and cross-section of the sulfuration layer were analyzed by field emission scanning electron microscopy (FESEM), and wear property under high load, high speed and high temperature conditions were tested by a SRV®4 friction and wear testing machine. The results show that the CrMoN/MoS2 composite coatings appear as a dense grain structure, and the coating is an ideal solid lubrication layer that possesses an excellent high temperature wear resistance, reducing the engine operating temperature abrasion effectively and prolonging the service life of the engine.
Highlights
A piston ring and cylinder is the most important friction pair, which is often used in harsh environments under conditions of high speed, high temperature, and high load
The loss of wear caused by the friction pair is a key problem that reduces engine life [1,2,3]
The results show that the friction and wear properties of a piston ring treated by ion plating are improved significantly compared with that of Cr plating, and this method can reduce the environmental pollution and human resources wastes [6]
Summary
A piston ring and cylinder is the most important friction pair, which is often used in harsh environments under conditions of high speed, high temperature, and high load. How to reduce the wear of the piston ring and cylinder has become a main research aim of many scholars. The conventional plating Cr process has been adopted to strengthen the piston ring of heavy-duty vehicle engines and it is popularly used in the industry [4,5]. This method has shown some improvement in wear resistance, the pollution caused by the traditional electroplating
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