喷雾干燥法处理水合氧化锆

比较了采用直接煅烧、干燥后煅烧、喷雾干燥等3种方法处理水合ZrO2,再通过气流粉碎获得超微细粉ZrO2;同时用激光衍射法、光透法、场发射扫描电镜和BET法测试了粉末的性能.结果表明:直接煅烧水合ZrO2获得的粉末团聚严重,颗粒粗而均匀性差;水合ZrO2通过低温静止干燥,可以减少颗粒的团聚,提高粉末颗粒分布的均匀性,但效率低;喷雾干燥法处理水合ZrO2,通过动态反应,易获得细晶粒的球状颗粒,可避免粉末的团聚,且粉末分散性好、晶粒分布均匀.

Hydrous ZrO2 treated by spray drying method

Three methods were used to treat hydrous ZrO_2 such as direct sintering, sintering after drying, spray dring, then the ultra-fine ZrO_2 powder was prepared by air-jet milling. The physical properties were tested by laser diffractrometry, light transmission, field emission scanning electron microscopy and Brunauer-Emmett-Teller(BET). The results that, the powder sintered directly are agglomerated greatly, rough and not well-distributed. The powder sintered after drying, through static reaction, has lower agglomeration and better distribution, but lower efficiency. The ultra-fine powder prepared by spray drying method, through the dynamic reaction, not only can prohibit the agglomeration and be obtained easily, but also has well-distributed and good dispersibility.