湿化学工艺条件对ZrO_2(Y_2O_3)超细颗粒团聚的影响  

EFFECTS OF WET CHEMICAL PROCESSING CONDITIONS ON THE AGGLOMERATION OF ZrO 2(Y 2O 3) ULTRAFINE PARTICLES

作　　者：方小龙[1] 杨传芳[1] 陈家镛[1] 

机构地区：[1]中国科学院化工冶金研究所

出　　处：《硅酸盐学报》1998年第6期732-739,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金

摘　　要：分别用水相共沉淀法和反胶团内共沉淀法制备了二氧化锆前驱体即氢氧化锆胶体，对前驱体分别进行水洗和无水乙醇超声洗涤，并在不同温度下真空干燥，干燥后的前驱体在６００℃煅烧２ｈ，得到晶体ＺｒＯ２（Ｙ２Ｏ３）粉末．对干燥前驱体进行ＴＧ－ＤＴＡ和ＦＴＩＲ分析，并对二氧化锆晶体颗粒进行ＴＥＭ观察，证实反胶团法可以获得单分散、球形纳米颗粒．对前驱体进行无水乙醇超声洗涤、冷冻干燥均有利于减少粉末硬团聚的产生，减少共沉淀前驱体表面吸附水分是控制超细粉末硬团聚的有效手段．Zr(OH) 4 gels were synthesized by coprecipitation in reverse micelles and in bulk water solution respectively. The precursors were ultrasonically washed with water or absolute ethyl alcohol, then dried at different temperatures in vacuum and calcined at 600 ℃ to produce crystalline ZrO 2(Y 2O 3) nanoparticles. The dried precursors were characterized with TG-DTA and FTIR,the calcinated particles were characterized with TEM. It is shown that monodispersed nanoparticles with spherical shape can be synthesized using reverse micelles, while agglomeration exists in the powder synthesized from bulk aqueous solution. Ultrasonic washing with absolute ethyl alcohol and freeze drying could improve the dispersity of particles. It is also shown that the agglomeration of ZrO 2(Y 2O 3) nanoparticles could be improved effectively by removing water molecules and OH adsorbed on the precursor particles.

关 键 词：超细粉末 湿化学 二氧化锆陶瓷 三氧化钇陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]