Diamond-like coating piston ring containing transition layer and preparation method thereof

Abstract

The invention provides a diamond-like coating piston ring containing a transition layer and a preparation method thereof. The diamond-like coating piston ring comprises a piston ring base body, wherein titanium nitride layers with gradually increased nitrogen gas content are arranged on the outer circular surface of the piston ring base body from inside to outside; and diamond-like coatings are arranged on the outer circular surfaces of the titanium nitride layers. The diamond-like coating piston ring has the advantages that a production technology is simple, and a transition layer between titanium nitride with the gradually increased nitrogen content and the piston ring is utilized and the rigidity of the titanium nitride layers is changed through the nitrogen gas amount of the titanium nitride layers, so that the rigidity of the titanium nitride is in a range between titanium and the diamond-like coating, and a rigidity gradient from the titanium to the diamond-like coating can be effectively formed, and furthermore, the anti-scratching and anti-peeling capabilities of the coating on the piston ring are increased; meanwhile, the total thickness of the piston ring is not influenced and specifications of the piston ring are not influenced; and the piston ring base body has a good service life and the practicability of the piston ring is increased.

Description

technical field [0001] The invention relates to the technical field of piston rings, in particular to a diamond-like coating piston ring containing a transition layer and a preparation method thereof. Background technique [0002] In 2020, the national standard for fuel consumption of passenger cars is below 5L per 100 kilometers, which puts high demands on engine factories and automobile factories, and reducing the friction work loss of engines is one of the important means to reduce the fuel consumption of automobiles. The frictional power loss of the piston ring accounts for more than 25% of the total frictional power loss of the engine, so reducing the frictional loss of the piston ring contributes greatly to reducing the fuel consumption of the engine; [0003] The most effective way to reduce the loss of friction work of piston rings is to use low friction coefficient coatings. The diamond-like coating has low friction and high wear resistance, which just meets the low...

AI Technical Summary

Problems solved by technology

[0003] The most effective way to reduce the friction work loss of piston rings is to use low friction coefficient coatings. The diamond-like coating has low friction and high wear resistance, which just meets the low friction requirements of piston rings. The diamond-like coating has high hardness and internal stress. Large, directly apply the diamond-like coating to the surface of the piston ring, the bonding force is difficult to guarantee, and it is easy to fall off;

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