Applicant of hydrogenated diamond like coating on plunger for marine diesel engine

doi:10.13251/j.issn.0254-6051.2020.11.044

Abstract

Abstract: With Cr, WC and graphite as targets and Ar and C₂H₂ as working gases, hydrogenated diamond like coating with Cr and WC as transition layers was prepared on the plunger of marine diesel engine by composite technology of magnetron sputtering and plasma enhanced chemical vapor deposition. The results show that the crystal of the coating grows well, and continuous with high density, no stratification, cracking or peeling phenomenon can be observed. The coating is relatively smooth, which improves sharply the hardness, elastic modulus and decreases the friction coefficient under heavy diesel oil environment. After the bench test, relatively obvious parallel grooving wear marks appear on the surface of the plunger without coating, and the overall wear is more serious, while the wear marks on the surface of the plunger with coating are very narrow and shallow, which is less in quantity. It is proved that the wear resistance of the plunger surface after preparing diamond like coating is significantly improved.

Key words: plunger, magnetron sputtering, plasma enhanced chemical vapor deposition, hydrogenated diamond like coating, friction and wear

CLC Number:

TG174.444

Wang Yongkun, Qin Hong, Yang Jing, Miao Xueqiang, Liu Hui'e, Chen Chao. Applicant of hydrogenated diamond like coating on plunger for marine diesel engine[J]. Heat Treatment of Metals, 2020, 45(11): 226-231.

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