Diamond-like coating piston ring and preparation method thereof

Abstract

The invention provides a diamond-like coating piston ring and a preparation method thereof. A titanium nitride transition layer with an increasing nitrogen content is arranged on the outer circle surface of a piston ring base body, one or more groups of diamond-like composite coatings are arranged on the titanium nitride transition layer from inside to outside, and the diamond-like composite coating comprises a soft diamond-like coating and a hard diamond-like coating which are arranged from inside to outside. According to the diamond-like coating piston ring and the preparation method thereof, the titanium nitride with the increasing nitrogen content is used as a transition structure between the diamond-like composite coating and the piston ring base body, meanwhile, the diamond-like composite coating adopts a soft and hard alternative structure, the internal stress of the diamond-like composite coating can be reduced, so that the service life of the later use is prolonged; and meanwhile, the piston ring with the soft and hard alternative diamond-like coating is simple in production process, the thickness can be changed according to actual needs, and the practicability of the piston ring is improved.

Description

technical field [0001] The invention relates to the technical field of piston rings, in particular to a diamond-like coating piston ring 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 working friction power of piston rings The loss accounts for more than 25% of the total friction loss of the engine, so reducing the friction 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 friction requirements of piston ...

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;

[0004] In some patents, some methods are also used. In the process of making diamond-like coatings, W, Si, H and other elements are added to reduce the internal stress of the coating and improve the bonding strength to a certain extent, but the added elements affect the resistance of diamond-like coatings. Abrasiveness, high temperature stability, not the best choice;

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