高能微弧火花沉积高熵合金涂层形成机理及控制机制研究

项目名称： 高能微弧火花沉积高熵合金涂层形成机理及控制机制研究

项目编号： No.51465030

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 王小荣

作者单位： 兰州交通大学

项目金额： 48万元

中文摘要： 高熵合金涂层因其高熵效应作用可大大提高金属表面性能，成为涂层领域的新型材料。本项目提出采用高能微弧火花制备高熵合金涂层的新方法，构建高能微弧火花-计算机集成沉积系统，实现沉积过程的数控化和对高熵合金涂层质量、结构和表观特征的可控性。本项目通过研究高能微弧火花下高熵合金电极各元素的过渡和控制规律；工艺参数对高熵合金涂层结构类型的影响规律；具有简单FCC/BCC固溶体结构、纳米晶/微晶及非晶结构的高熵合金涂层制备和控制方法；高熵效应下涂层显微组织形成及演变机理及其对涂层性能的影响规律；高熵合金涂层的高温稳定性及其高温结构演变行为；高熵合金金属涂层与其氮/碳化物涂层显微结构及其控制规律；最终获得提高涂层耐磨性、硬度、耐蚀性和抗高温氧化性能的新方法。本研究对丰富涂层制备内涵，开拓新材料涂层制备新思路，具有非常重要的理论及现实意义。

中文关键词： 焊接自动化；表面合金化；焊接工艺；显微结构；组织演变

英文摘要： Due to high-entropy effect, high-entropy alloy (HEA) coating can largely enhance properties of substrate surface, which makes HEA be a new material in the coating field. This project presents a novel approach to prepare HEA coating via high-energy micro-arc spark (HEMAS). HEMAS-computer integrated deposition system (HEMAS-CIDS) will be set up in order to realize the deposition-automatization and the controllability of the coating quality, microstructure, and apparent characteristics of HEA coating. The transfer and its control law of every element of HEA electrode in HEMAS process will be carried out. The effect of process parameters on coating's structure pattern will be explored. The preparation and its control of coatings with single simple FCC/BCC solid solution, nano-crystaline /micro-crystaline and amorphous will be studied. The microstructure formation and its evolution mechanism and their effects on the properties of coatings will be investigated. The high-temperature stability and the evolution behavior of structures in high-temperature of HEA coatings will be analyzed. The microstructures and their control mechanism of the HEA metallic coating, nitride coating and carbide coating will be carried out. Eventually, the approaches to improve wear resistance, hardness, corrosion resistance and anti-high-temperature oxidation will be gotten. This project has a very important theoretical and practical significance to enrich the coating preparation connotation and expand innovative ideas of coating preparation.

英文关键词： welding automation;surface alloying;welding process;microstructure;microstructure evolution