二氧化硅喷雾造粒粉体的热处理工艺研究  

Study of Heat Treatment Process of SiO_2 Particles by Spray Pelletization

作　　者：杜令忠[1] 张伟刚[1] 张登君[1] 李报厚[1] 

机构地区：[1]中国科学院过程工程研究所,北京100080

出　　处：《中国粉体技术》2007年第2期24-26,共3页China Powder Science and Technology

摘　　要：研制了一种以SiO2为基体的高温可磨耗封严涂层,为了改善二氧化硅喷雾造粒粉体的性能,研究了热处理工艺对粉体松装密度、流动速度及粒度分布的影响。结果表明,热处理过程中伴随着SiO2颗粒的烧结,热处理温度对粉体性能的影响较热处理时间更为显著,随着温度的升高,喷雾造粒SiO2球逐渐烧结,粉体粒度减小,松装密度增加,流动性提高,采用1000～1050℃、30～60min的工艺对粉体进行热处理能够获得最优的粉体性能。A SiO2 based abradable sealing coating used in high temperature was studied. In order to improve the properties of the SiO2 particles by spray pelletization, the influences of heat treatment process on the apparent density, flowability and size distribution of the SiO2 particles were studied. The results showed that the SiO2 particles are sintered during the heat treatment. The influence of the temperature was more obvious than that of the time. With the increase of the temperature, the size of the particles was decreased,while the apparent density and the flowability were improved. The SiO2 particles treated at the temperature 1 000- 1050 ℃ for 30-60 minutes might get the optimized performance.

关 键 词：喷雾造粒 热处理 烧结 松装密度 流动速度 

分 类 号：TB332[一般工业技术—材料科学与工程]