不同氧化铝粉末等离子喷涂氧化铝涂层的性能  

Properties of APS alumina coating with different alumina particle distributions as feedstock

作　　者：朱晖朝[1,2] 邓春明[2] 周克崧[2] 刘敏[2] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广州有色金属研究院材料表面所,广东广州510650

出　　处：《材料研究与应用》2009年第3期153-157,共5页Materials Research and Application

摘　　要：分别以22．5～45μm（L粉）、5～40pm（M粉）和5～22．5μm（S粉）三种粒径的氧化铝为热喷涂粉末。采用大气等离子喷涂制备了氧化铝涂层．分别对三种涂层的结构和基本性能进行表征，并采用Spray Watch 3i设备测量粉末粒子在等离子焰流中的温度和速度．结果表明，S和L涂层的孔隙率较低，且大孔隙较少．在焰流中，S和L粉均具有较高的温度和动能，其涂层的显微硬度和结合强度均比M涂层高．S粉的沉积率最高，但涂层的生产效率较低．考虑生产效率和涂层的综合性能，选择L粉更合适．Three alumina coatings were prepared via air plasma spray （APS） with alumina particle size distributions of 22.5-45μm （L powder） ,5-40μm （M powder） and 5-22. 5μm（S powder） as feedstock. Microstructure and fundamental performance for three coatings were characterized, and the particle temperature and velocity in plasma plume were tested by SprayWatch 3i instrument in this paper. It was found that S and L coatings exhibited similar low porosity and few big pores. S and L particle owned higher temperature and kinetic energy in plasma flame compared with M particle, therefore higher micro-hardness and adhesive strength coatings were attained than those of M coating. S powder had the highest deposition efficiency,but low production rate due to its low powder feeding. L powder was the best choice by taking into consideration of production rate and comprehensive coating properties.

关 键 词：氧化铝粉末 大气等离子喷涂 涂层性能 

分 类 号：TB742[一般工业技术—材料科学与工程]