V(Al,Si)N纳米复合涂层的原子高温扩散调控及其高温摩擦学行为研究

V基氮化物涂层的高温自润滑效应主要源于涂层表面氧化形成的氧化物润滑相。然而，V原子在高温状态下的快速外扩散和氧化会导致涂层失效，不能同时满足自润滑和高抗磨的使用性能要求。本项目提出：拟通过原位形成非晶包裹纳米晶两相复合结构，减少V、O原子的高扩散率通道，实现对润滑元素高温外扩散和氧化的调控。采用磁控溅射技术，通过Al、Si元素共掺杂制备V(Al,Si)N纳米复合涂层；借助微结构表征和抗氧化性研究，探寻两相复合微结构、抗氧化元素Al含量对V、O原子高温扩散的调控规律；结合高温摩擦磨损试验和磨损微区分析，揭示涂层高温自润滑机理及失效机制，并进一步阐明高温自润滑效应和纳米复合结构在高温润滑抗磨中的协同作用,获得兼备高温自润滑性和高抗磨的涂层。研究结果可为航空合金高速干切削刀具涂层的开发与应用提供理论依据和实验基础。

The high-temperature lubricating effect of vanadium containing hard coatings is mainly based on the formation of vanadium oxides on surfaces. However, the rapid out-diffusion and oxidation of vanadium generally results in the complete failure of coating. Here, it is proposed that the out-diffusion and oxidation of vanadium could be controlled by forming the nanocomposite structure composed of nanograins dispersed in an amorphous matrix, in which the rapid diffusion channels of vanadium and oxygen atoms could be reduced drastically. These V(Al,Si)N nanocomposite coatings will be prepared by co-doping aluminum and silicon in a controlled manner using magnetron sputterings. Through the microstructural examination and the anti-oxdiation study, the effects of nanocoposite microstructure and aluminum content on the diffusion of vanumium and oxygen atoms could be revealed. Systematic tribological tests and post examination of worn tracks are planed to perform to clarify the high-temperature self-lubrication behaviour and the failure mechanism for the coatings. Based on these results, the anti-friction performance and wear resistance will further be discussed in terms of the synergy between the self-lubrication and the nanostructure. It is expected that this project could be valuable for the designing of tool coatings used in the drying cutting of aerometal.