Preparation and high-temperature friction behavior of TiN coating on valve disc cone surface based on dual glow technology

doi:10.13251/j.issn.0254-6051.2024.07.030

Abstract

Abstract: TiN coatings were prepared on NCF3015 valve alloy steel using double-layer glow plasma surface metallurgy technology. The microstructure, hardness and high-temperature wear resistance of the coatings were studied by SEM, EDS, XRD, microhardness tester and high-temperature friction and wear tester. The results show that the TiN coating grows uniformly in an island-like manner and has a dense surface structure. The average surface hardness of the coating can reach 1265.2 HV0.05. Under 5 N and 10 N loads, the specific wear rate of the coating is reduced by 79.3% and 79.7% compared to the valve substrate, respectively. It is an ideal material for valve surface protection under high temperature and harsh conditions, and can significantly improve the service life of valves in engines.

Key words: double-layer glow plasma surface metallurgy technology, TiN coating, hardness, high temperature wear resistance, surface protection

CLC Number:

TG178

Luo Changzeng, Zeng Xiaoxiao, Wei Dongbo, Li Xucong, Chen Yuechun, Lin Muyao, Zhang Pingze. Preparation and high-temperature friction behavior of TiN coating on valve disc cone surface based on dual glow technology[J]. Heat Treatment of Metals, 2024, 49(7): 195-199.

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