钼合金表面MoSi_2涂层的制备工艺和形成机理  

Preparation and formation mechanism of MoSi_2 coating on molybdenum alloy

作　　者：李鹏飞[1] 范景莲[1] 成会朝[1] 田家敏[1] 成创功[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第7期2506-2512,共7页Journal of Central South University:Science and Technology

基　　金：国家杰出青年科学基金资助项目(50925416);教育部博士点基金资助项目(20090162110032)

摘　　要：采用包埋渗硅法在钼合金表面上制备MoSi2涂层,研究粉料成分、粒度和反应时间对涂层厚度的影响,分析MoSi2涂层的形成机理。研究结果表明:随着粉料中硅粉和活化剂粉末含量的增加,涂层的厚度呈现先增加后降低趋势;粉料中活化剂的质量分数为10%时,能够制备厚度为130μm的涂层;高能球磨能够提高粉末的表面活性,促进涂层生长,球磨30 h的硅粉粉料在高温下渗硅15 h后,涂层厚度能够达到160μm。MoSi2涂层的生长受扩散反应过程控制,形成的涂层包括2层:外层为MoSi2层,内层为Mo5Si3过渡层。A MoSi2 coating on molybdenum alloy was prepared by pack cementation. The effect of powder component, silicon powder particle size and time on the thickness of MoSi2 coating was studied. The formation mechanism of MoSi2 coating was analyzed. The results show that as the amount of silicon powder and catalyst powder increases, the thickness of the coating increases at first and then decreases. The thickness of coating can grow to 130 μm when the content of catalyst is 10%. The fine silicon powder promotes the growth of the coating and the thickness of the coating can grow to 160 μm after siliconizing at elevated temperature for 15 h when the silicon powder is milled for 30 h. The process of MoSi2 coating growing is controlled by diffusion. The coating includes two layers： the outer MoSi2 layer and the inner MosSi3 transition layer.

关 键 词：MoSi2涂层 催化剂 球磨时间 形成机理 

分 类 号：TG146.412[一般工业技术—材料科学与工程]