【摘要】 在γ-Al₂O₃粉体中添加氧化铝胶体，研究其对氧化铝α相变的影响．结果表明，与α氧化铝粉体籽晶相比较，氧化铝胶体也可以起到籽晶的作用；由于其颗粒较小、在γ-Al₂O₃中分散均匀且能与之紧密接触，大大降低了α相变温度，改善了煅烧产物的微结构，从而得到分散均匀、平均粒径＜100nm 的α氧化铝超细粉体，根据对粉体形貌 TEM 的观察，初步探讨了添加氧化铝胶体的前驱体α相变的过程。更多还原

【Abstract】 The effect of alumina sol on the α phase transformation in γ-alumina powder has been studied.Incomparison with α-alumina seeds,the alumina sol can also act as seeds.Moreover,because of the small particlesize and perfect dispersibility of the alumina sol,the α phase transformation temperature is decreased and,meanwhile,the microstructure of the produced powders is modified.So ultrafined powders with a particle sizeless than 100 nm were produced with good dispersibility.The α phase transformation of the alumina precursorswith alumina sol doping was studied on the base of the TEM photographs of the produced powders.更多还原