DLC 和CrN 薄膜在油润滑下的摩擦性能

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DLC 和CrN 薄膜在油润滑下的摩擦性能
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作者单位:兰州交通大学机电工程学院
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中图分类号:TG17
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Tribological Properties of DLC and CrN Films Under Engine Oil

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摘要:

采用闭合场非平衡直流磁控溅射技术和阴极电弧离子镀技术在轴承钢表面分别制备了DLC 和

CrN 薄膜,在全配方发动机油(CF-4,15W/40)润滑条件下,选择DLC/ 钢、CrN/ 钢摩擦配副,用SRV-IV 摩擦实

验机考察了25℃和100℃时DLC 与CrN 薄膜在不同载荷下的摩擦因数和磨损率,并对摩擦界面进行分析。结

果表明:DLC 和CrN 薄膜在油润滑条件下的摩擦因数都随着载荷的增加而降低;DLC 和CF-4 构成的固液复合

润滑体系具有更加优异的摩擦学性能;活性较高的CrN 薄膜与发动机油中的添加剂相互作用,在摩擦界面上

发生摩擦化学反应形成摩擦化学反应膜,并且薄膜表面形成的氧化层有利于提高薄膜在高温时的耐磨性。

Abstract:

Diamond-like Carbon (DLC) films was deposited on the bearing steel by closed-filed unbalanced magnetron

sputter technique, and CrN films was deposited on the bearing steel by cathodic arc ion plating. The tribological

performance of DLC and CrN films in the fully formulated engine oil (CF-4, 15W/40) lubrication conditions were investigated

on a SRV-IV tribo-meter. The effects of load and temperature on the friction coefficient and wear rate were

analyzed. The results indicate that the friction coefficient of two kinds of films decreases with increasing load under oil

lubrication condition. DLC solid/ liquid synergistic lubrication have excellent tribological properties compared to the liquid

lubrication. Thin tribofilm on the interface caused by the tribochemical interaction between CrN films and additives

in the CF-4 engine oil decrease the friction coefficient under high load and high temperature. In addition, the wear resistance

of the CrN films was improved as oxide layer formed on the surface at higher temperature.

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王顺花. DLC 和CrN 薄膜在油润滑下的摩擦性能[J].宇航材料工艺,2014,44(6).

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在线发布日期: 2016-11-28
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