等离子喷涂工艺参数对二硅化钼涂层微观结构的影响
The influence of spraying parameters on the microstrcture of molybdenum disilicide coating prepared by thermal spraying
颜建辉， 胡小平，唐思文， 许剑光
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作者单位：1.湖南科技大学先进材料制备及应用技术研究所，湖南 湘潭 411201
2. 湖南省高温耐磨材料国防科技重点实验室，湖南湘潭 411201
中文关键字：喷涂参数；二硅化钼；涂层；微观组织
英文关键字：spraying parameters; molybdenum disilicide; coating; microstrcture
中文摘要：以粒度范围为30~54μm的二硅化钼为喷涂粉末，研究了喷涂工艺参数对二硅化钼涂层的微观结构的影响。结果表明，喷涂过程中，喷涂粉末中部分四方相MoSi2(t)转变为六方相MoSi2 (h)，MoSi2中Si含量出现了烧损。随着喷涂距离、功率、氩气流量和送粉速率的增加，涂层的孔隙率先减少后增加。随着氩气流量和送粉速率的增加，熔融粒子氧化程度逐渐减弱；而喷涂距离和喷涂功率的增加，熔融颗粒氧化加剧，富钼相出现的趋势增加。获得以MoSi2为主相涂层的喷涂工艺规范较宽，较佳的喷涂工艺参数为：喷涂电流500A；电压70V；喷涂距离100mm；送粉量26g/min；氩气流量45L/min。
英文摘要：MoSi2 coating was prepared by air plasma spraying with MoSi2 particle size distributions of 30~54μm as feedstock. The influence of spraying parameters on the microstructure of MoSi2 coatings were investigated. The results showed that some MoSi2 (t) phase changed to MoSi2 (h) crystal structure during the course of spraying and the content of Si also reduce. With the increasing of spraying distance, power, primary Ar and powder feed rate, the porosity first increased then gradually reduced. With the increasing of primary Ar and powder feed rate, the oxidation of melted particle was reduced.However, With the increasing of spraying distance, power, the oxidation of melted particle and the Mo rich phases were aggravated. The optimum technical conditions as follows: spray current 500A, spray volatg 70V, spray distance 100mm, feed rate21g/min, Ar 45L/min.