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。

关键词： 喷雾造粒;热处理;烧结;松装密度;流动速度

Abstract: 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. 

Keywords: spray pelletization; heat treatment; sintering; apparent density; flowability