摘要
利用流态化化学气相淀积（ＣＶＤ）制备Ａｌ＿２Ｏ＿３－ＳｎＯ＿２复合粒子。探讨了ＳｎＯ＿２在Ａｌ＿２Ｏ＿３超细颗粒上的包敷状态，考察了反应温度、反应物进料浓度比、反应时间等对反应结果的影响。结果表明，ＳｎＯ＿２在复合粒子团聚体体相中呈均匀分布，形成Ａｌ＿２Ｏ＿３－ＳｎＯ＿２复合粒子，ＳｎＯ＿２均匀淀积在Ａｌ＿２Ｏ＿３超细颗粒原生粒子表面，流态化ＣＶＤ包敷效果优于非流化过程；随反应时间的延长，产物中ＳｎＯ＿２含量线性递增；而当反应温度高于３００℃，反应物Ｈ＿２Ｏ和ＳｎＣｌ＿４配比大于４：１时，ＳｎＯ＿２含量基本保持不变。
Ultrafine powders coating in fluidized bed reactor by chemical vapor deposition(CVD)method to synthesize Al_2O_3-SnO_2 composites were studied.Simultaneously,the effects of reaction temperature,reactants concentrations proportion and reacting time on coat-ing were also researched.The results indicated that:SnO_2 was distributed homogeneouslyboth on and in the Al_2O_3 clusters.The quantity of Al_2O_3 coating increased with inereasing ofreacting time. However,the coating effects would be less affected when reactor's temperature was higher than 300℃ and the proportion between two reactants H_2O and SnCl_4 washigher than 4:1.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
1994年第6期746-749,共4页
Journal of East China University of Science and Technology
基金
国家自然科学基金
关键词
超细粒子
流态化
化学气相淀积
复合粒子
ultrafine powders
fluidization
chemical vapor deposition
coating
synthesis
