摘要
以一水软铝石为前驱物,加入矿化剂和晶种,在水热条件下,可以制出纳米级的氧化铝微粉。通常水热处理温度要求很高,这在工艺上很难实现。引入与α-Al2O3具有等结构的晶种,降低了成核的活化能,可使水热处理温度下降到400℃,同时也缩短了保温时间。试验证明,添加5w t%的α-Al2O3晶种可以水热合成粒度分布均匀、颗粒近似板状的α-Al2O3微粉,晶种的种类和晶种的添加量等对水热过程有很大的影响。
Corundum（α-Al2O3） powders were directly prepared under hydrothermal condition from seeded boehmite and mineralizer. In general the hydrothermal treating temperature is high, which is difficult to achieve. The addition of α-Al2O3 crystal seeds reduces the nucleation activation energy,therefore reducing the phase transformation temperature, lowering hydrothermal treating temperature to 400℃,and at the same time shortening reacting time. The α-Al2O3 powders synthesized with 5% （in mass） α-Al2O3 crystal are micro-sized powders in uniform size and hexagonal prism shape, The α-Al2O3 crystal is affected by seed species and seed quantities.
出处
《中国陶瓷工业》
CAS
2006年第1期19-22,共4页
China Ceramic Industry
关键词
水热法
晶种
氧化铝微粉
hydrothermal synthesis method, seed, α-Al2O3 powder
