(Cr, V)2AlC 固溶体MAX相涂层的设计制备与高温润滑机制

航空航天、国防、核电等领域的关键运动部件在高温下的耐磨润滑问题，严重影响整个系统的运行稳定性和安全可靠性。施加高温润滑涂层是解决这一问题的有效途径。以优异高温抗氧化和力学性能为前提，通过摩擦诱导润滑相赋予其良好的润滑性能，是实现高温润滑涂层设计的核心思想。Cr2AlC MAX相涂层是一种具有密排六方结构的层状高温抗氧化涂层，但受限于其力学强度和润滑性能不足。借助固溶强化作用和Magnéli相V2O5良好的润滑特性，结合前期基础，本项目提出在Cr2AlC涂层中进行V固溶的设计思路，重点调控V元素的含量，实现高纯(Cr,V)2AlC MAX相涂层的可控制备，通过高温力学、热稳定性和高温摩擦行为的研究，探讨V的固溶强化机理，明晰润滑相V的高温扩散及涂层氧化规律，阐明高温抗磨减摩机制。研究结果将为设计和发展高性能MAX相涂层提供理论基础和技术支持。

The lubrication and wear performance at high temperature of moving key parts in the area of aerospace, national defense, nuclear power and other high-tech industries, closely affect the reliability and lifetime of the entire system. One of the effective ways to overcome this problem is to utilize high-temperature lubrication coatings. On the basis of the excellent high-temperature oxidation resistance and mechanical properties, the key idea of realizing the design of high-temperature lubrication coatings is the formation of the friction-induced lubrication phases which can provide good lubrication. Cr2AlC MAX phase coatings with close-packed hexagonal layer structure exhibit good oxidation resistance, but the shortcomings in mechanical and lubrication performances limit their application. With the help of solution strengthening effects and good lubrication of V2O5 Magnéli phase as well as our pre-work, we bring forward the study of V solid solution in Cr2AlC coatings. The amount of V is mainly controlled aiming to achieve (Cr, V)2AlC MAX phase coatings with a high purity. The effects of V content on the mechanical property, thermal stability and high-temperature tribological behavior will be established. The mechanism of solid solution strengthening will be discussed. The high-temperature diffusion of V element and oxidation behavior of the coatings will be clarified. The adaptive mechanism of (Cr, V)2AlC coatings will be revealed. These results will provide theoretical basis and technical support for the design and development of high performance MAX phase coatings.