摘要
以超细氧化铝粉体为原料,采用常压烧结工艺制备了氧化铝陶瓷。通过对烧结体断面显微结构的分析,以及对烧结体的线收缩率、密度和残余气孔率的测定,研究了烧结温度对坯体烧结致密化性能的影响和分散剂种类对烧结体残余气孔率的影响。结果表明,分散剂的种类对烧结体的残余气孔率影响较大,其效果由大到小依次为PAA-NH4和阿拉伯树胶>PAA-NH4>硅溶胶和PAA-NH4>硅溶胶>阿拉伯树胶;超细氧化铝粉体的致密化转变温度为1400℃左右,最终烧结温度为1550℃左右。
Al2O3 ceramic was prepared by normal pressure sintering using superfine alumina powder. Through analyzing the fracture microstructure, measuring line-shrinkage rate, density and residual porosity of sintered sample, the influence of sintering temperature on density and the influence of the type of dispersant on residual porosity of sintered sample were studied. The results show that their effect from large to small in turn is PAA-NH4 and gum arabic, PAA-NH4, PAA-NH4 and silica sol, silica sol, gum arabic. The densification transition temperature of superfine alumina powder is around 1400 ℃, and the ultimate sintering temperature is around 1550 ℃.
出处
《热加工工艺》
CSCD
北大核心
2008年第18期25-27,30,共4页
Hot Working Technology
关键词
超细氧化铝粉体
烧结温度
残余气孔率
superfine alumina powder
sintering temperature
residual porosity
