分散剂对氧化锆晶型的影响

以氧氯化锆为原料、尿素为沉淀剂,采用不同表面活性剂为分散剂,制备超细氧化锆粉体。实验研究发现,其他条件相同,采用聚乙二醇和聚乙烯醇作分散剂,所制得的氧化锆粉体以单斜晶为主,同时有一定量的四方晶氧化锆生成,且添加聚乙二醇生成的四方晶氧化锆较添加聚乙烯醇时生成的多;采用Span80作分散剂,明显抑制了四方晶氧化锆的生成,可制得较纯的单斜晶氧化锆粉体。另外,采用不同分散剂所制得的产物颗粒形状不同,用聚乙二醇作分散剂可制得纺锤形氧化锆粉体,而用聚乙烯醇或Span80作分散剂则可制得椭球形氧化锆粉体。

Effect of dispersant on crystal form of zirconia

Superfine zirconia powder was prepared using zirconium oxychloride as raw material,urea as precipitator,and different surfactants as dispersants.Experiment showed that based on the same test conditions,crystal form of zirconia was dominated by oblique crystal (monoclinic ZrO2) when adding polyethylene glycol (PEG) or polyvinyl alcohol (PVA) as dispersants;meanwhile,there was also some tetragonal ZrO2;moreover,PEG plays a more effective role than PVA in boosting output of tetragonal ZrO2;in contrast,Span80 w...