含氢类金刚石涂层在船用柴油机柱塞上的应用

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

利用磁控溅射和等离子增强化学气相沉积复合技术,以Cr、WC、石墨为靶材,Ar和C2H2为工作气体,在船用低速柴油机柱塞上涂覆了过渡层依次为Cr、WC的含氢类金刚石涂层。结果表明:涂层晶体生长良好,结构连续致密,均未出现分层、开裂及剥离的现象;涂层相对光滑,大幅度提高了柱塞表面的纳米硬度与弹性模量,同时降低了在重柴油环境下的摩擦因数,长时间的台架试验后未涂覆涂层的柱塞表面出现非常明显的平行状沟槽磨痕,而且整体磨损比较严重,而涂覆涂层的柱塞表面磨痕非常窄且浅,数量较少,类金刚石涂层可以明显提高柱塞表面的耐磨损性能。

With Cr,WC and graphite as targets and Ar and C2 H2 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.