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Impregnated ceramic treatment of piston rings

2020-03-23

 Piston ring is one of the core parts of the engine. The material of the piston ring should have suitable strength, hardness, elasticity and fatigue resistance, excellent wear resistance, heat resistance and corrosion resistance. With the development of modern engines toward high speed, high load, and low emissions, while the requirements for piston ring materials are becoming higher and higher, the surface treatment is also subject to higher requirements. More and more new heat treatment technologies Has been or is being used in the heat treatment of piston rings, such as ion nitriding, surface ceramics, nanotechnology, etc. This article mainly introduces the infiltration ceramic treatment of piston ring.


 

Piston ring immersion ceramic treatment is a low-temperature plasma chemical vapor deposition technology (PCVD for short). A ceramic film with a thickness of several micrometers is grown on the surface of the metal substrate. At the same time when the ceramic penetrates into the metal surface, the metal ions also enter the ceramic The film penetrates inside and forms two-way diffusion, becoming a "cermet composite film". In particular, the process can grow the metal composite ceramic material on a metal substrate that is difficult for semiconductor materials such as chromium to diffuse into.

This "metal ceramic composite film" has the following characteristics:

1. Growing at low temperature below 300℃ without any adverse effect on the piston ring;

2. The metal on the surface of the piston ring undergoes two-way diffusion with boron nitride and cubic silicon nitride in a vacuum plasma state, forming a functional material with a gradient gradient, so it is firmly combined;

3. Because the ceramic thin film and metal form an oblique gradient functional material, it not only plays a role in firmly bonding the transition layer, but also changes the strength of the ceramic bond edge, improves the bending resistance, and significantly improves the surface hardness and toughness of the ring ;

4. Better high temperature wear resistance;

5. Enhanced antioxidant capacity.

Because the ceramic film has a self-lubricating function, the piston ring impregnated with ceramic piston ring can reduce the friction coefficient of the engine by 17% 30%, and the amount of wear between it and the friction pair is reduced by 2/5 1/2, and it can be significantly reduced. Engine vibration and noise. At the same time, due to the good sealing performance between the ceramic film and the engine cylinder liner, the average air leakage of the piston has also decreased by 9.4%, and the engine power can be increased by 4.8% 13.3%. And save fuel 2.2% 22.7%, engine oil 30% 50%.