摘要
通过XRD衍射分析和SEM扫描电镜、差热失重、BET比表面仪等分析手段,对硫酸铵盐制取高纯氧化铝粉的热解过程进行了详细分析,提出了其热解相变过程为:Al2(SO4)3950～1000 ℃→δ-Al2O31100℃→纳米级α-Al2O3+δ-Al2O31200～1220 ℃→亚微米级α-Al2O3通过采用无压分段式热解工艺,可获得分散性良好的类球性高纯度氧化铝粉.通过实际产品烧结证明,其活性明显高于其它同类原理制备的氧化铝粉.
By means of XRD and SEM,difference heat,BET specific surface area instruments, we had analysed the pyrogenation process of vitriol salt for making high purity alumina powder,and put forward the crystal phase changes process: Al2(SO4)3 950-1000℃-Al2O3 1100℃ nano-α-Al2O3+δ-Al2O3 1200-1220 ℃sub-micron-α-Al2O3 By adopting technology of subsection firing,We may obtain ball-like alumina powder with better dispersancy and high purity.It is proved that the activity of powders is better than others made in the same principle by practice ceramics firing.
出处
《真空电子技术》
2007年第4期10-13,41,共5页
Vacuum Electronics
