Y改性的MoSi2-MoBx复合涂层制备及氧化行为  

Preparation and Oxidation Behavior of Y Modified MoSi2-MoBx Composite Coating

作　　者：王雄禹 张勇[1,2,3] 支龙[4] 沈淑馨[1] 王利捷 冯鹏发[2] 曹维成[2] WANG Xiongyu;ZHANG Yong;ZHI Long;SHEN Shuxin;WANG Lijie;FENG Pengfa;CAO Weicheng(School of Material Science and Engineering, Chang＇an University, Xi＇an 710064, China;Technical Center, Jinduicheng Molybdenum Co., Ltd., Xi＇an 710077, China;Postdoctoral Scientific Research Station of Mechanical Engineering, Chang＇an University, Xi＇an 710064, China;CSIC No. 12 Research Institute, Xingping 713102, China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]金堆城钼业股份有限公司技术中心,陕西西安710077 [3]长安大学机械工程博士后科研流动站,陕西西安710064 [4]中船重工第十二研究所,陕西兴平713102

出　　处：《热加工工艺》2018年第6期161-164,共4页Hot Working Technology

基　　金：陕西省自然科学基金资助项目(2016JQ5064);长安大学创新创业训练计划资助项目(201710710109)

摘　　要：通过两步包埋法在钼表面制备了Y改性的MoSi2/MoBx复合涂层。采用SEM、EDS和XRD分析了渗剂中Y添加对渗B过程影响及Y改性的MoSi2/MoBx复合涂层的组织结构与氧化行为。结果表明：在渗B过程中,涂层表层的主要物相为β-MoB2;添加稀土Y能增强B元素的向内扩散,并起到催渗作用;Y改性的MoSi2/MoBx外层为固溶了部分MoB的MoSi2,内层为MoB与Mo2B混合相;在1150℃下循环氧化20h后,Y改性的MoSi2/MoBx复合涂层的外层生成了SiO2层,且MoSi2发生了扩散,生成了Mo5Si3,但MoBx层能有效阻止MoSi2的扩散。Y modified MoSi2/MoB composite coating was prepared by two-step pack cementation methods on molybdenum surface. The effects of Y addition on the boronizing process and the microstructure and oxidation behavior of Y modified MoSi2/MoBx composite coatings were analyzed by SEM, EDS and XRD. The results show that the main phase of the coating is β-MoB2 during boronizing process, and the addition of rare earth Y can enhance the inward diffusion of B element and has catalytic effect. The outer layer of Y modified MoSi2/MoBx composite coating is MoSi2 with solid slution of part of MoB. The inner layer is MoB and Mo2B mixed phase. After cyclic oxidation at 1150 ℃ for 20 h, the outer layer of Y modified MoSi2/MoBx composite coating generates SiO2 layer and MoSi2 generates diffusion, then, M05Si3 appears, but MoBx layer can effectively prevent the diffusion of MoSi2.

关 键 词：钼 包埋法 涂层 稀土 

分 类 号：TG174.44[金属学及工艺—金属表面处理]