富钼相网状分布改性二硅化钼涂层的制备及性能研究

项目名称： 富钼相网状分布改性二硅化钼涂层的制备及性能研究

项目编号： No.51475161

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 颜建辉

作者单位： 湖南科技大学

项目金额： 82万元

中文摘要： 二硅化钼（MoSi2）是一种极具应用潜力的耐磨涂层材料。然而，等离子喷涂MoSi2涂层的低韧性和弱结合强度制约着其实际应用。改变传统的材料组分研究思想，采用非均相沉淀-热还原-喷雾干燥-真空烧结技术制备富钼相网状分布MoSi2喷涂粉末，提出利用富钼相网状分布来改性MoSi2涂层的新思想，以提高涂层的力学和耐磨性能。探讨制备工艺对粉末包覆效果、富钼层尺度及微观结构的影响，阐明网状结构粉末的形成机制，实现喷涂粉末的可控制备；研究富钼相网状结构特征及其尺度对MoSi2涂层的力学性能、结合强度和摩擦磨损性能的影响规律，弄清网状结构MoSi2涂层的微观结构、力学性能和摩擦学性能之间的关联性；揭示富钼相网状分布改性MoSi2涂层的韧化机理、结合机理和耐磨机理，阐明复合涂层的磨损失效行为及其机制。研究成果为高性能耐磨涂层材料的研制提供理论支持和实验依据，对丰富和发展摩擦学理论与设计具有重要的意义。

中文关键词： 二硅化钼涂层；力学性能；摩擦学性能；作用机理；网状结构

英文摘要： Molybdenum disilicide (MoSi2) is expected to be used as a promising wear-resistant coating for engineering application. However, the inherent brittleness and poor interface strength of plasma spraying MoSi2 coating restrict its wide-range applications. In this project, MoSi2 spherical powder coated by rich molybdenum phases will be prepared with heterogeneous precipitation, thermal reduction, spray drying technology and vacuum singtering technology. In order to improve the mechanical proterties and wear resistance performance of MoSi2 coating, the new idea of brittleness and interface strength of MoSi2 coating improved using rich molybdenum phases network structure distribution was proposed. The influence of preparation technology on the rich molybdenum layer thickness, interface structure and microstructure were studied, and the formation mechanism of coating powder was also studied, aiming to realize the optimization control of powder preparation. The effects of rich molybdenum layer size, microstructure and interface microstructure on the mechanical performance and tribological performance of MoSi2 coating are examined. The relationship between microstructure,mechanical performance and tribological performance of MoSi2 coating was determined.The toughening mechanism and wear mechanism of MoSi2 coating modified using rich molybdenum phases network structure were revealed. The research results provide some useful theoretical support and experimental basis for development of high performance friction material. It is of great importance for enriching and developing the tribology theory and design.

英文关键词： MoSi2 coating;mechanical properties;tribological properties;action mechanism;network structure