利用脉冲激光沉积技术制备了不同Ag含量的VN/Ag复合薄膜,利用扫描电子显微镜、X射线衍射仪、纳米力学测试系统等设备袁征薄膜的组织结构、成分、表面形貌及力学性能,利用UMT-3摩擦试验机考察薄膜在室温至900℃下的摩擦学性能.结果表明,随着Ag含量的增多,薄膜的组织形貌变差,硬度及弹性模量降低.当Ag含量为16％(原子分数)时薄膜在试验温度范围内的摩擦学性能最佳.由于Ag在低温的润滑特性及高温摩擦化学反应生成了新的润滑相,如V2O5、V6O11、V6O13、Ag3VO4、AgVO3等,使得摩擦系数随温度的升高而逐渐降低,在900℃下取得最低值0.08,实现了宽温域内的连续润滑.
A series of VN/Ag films varied in Ag-concentration were fabricated by pulsed laser deposition (PLD) technique and characterized by scanning electron microscope,X-ray diffraction technique,nanomechanical testing system and UMT-3 wear tester.The results showed that the deteriorating surface morphology and decreased mechanical properties of the films are attributed to the increased Ag content.The VN/Ag films with Ag-concentrations of 16％ registered the enhanced tribological property compared to the others over the'investigated temperatures,the friction coefficient decreased with the temperature increasing and hold the lowest value of 0.08 at 900℃.Combining with the lubricating Ag at low temperatures and the new lubrication phase generated by tribochemical reaction could be responsible to the excellent tribological performance of the VN/Ag films in a wide temperature range.
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