制备工艺对超细氧化钇粉体形态与烧结性的影响  

Influence of Processing Conditions on Morphologies and Sinterability of Ultrafine Y_2O_3 Powders

作　　者：霍地[1] 孙旭东[1] 修稚萌[1] 李晓东[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110004

出　　处：《中国稀土学报》2007年第5期566-572,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(50372009);辽宁省自然科学基金(20062019);国家杰出青年基金(50425413)资助项目

摘　　要：以碳酸氢铵为沉淀剂,研究了不同沉淀反应终点pH值、陈化时间,以及沉淀前驱体煅烧温度对超细氧化钇粉体的形态和烧结致密化的影响。沉淀反应终点pH=7.0和7.8时,随着陈化时间的增加,煅烧后的粉体颗粒均匀长大、形态近似于球形,烧结致密化程度较高。在pH=8.3时,陈化处理后粉体颗粒长大明显且呈不规则形状,而且随陈化时间增长,粉体的烧结活性降低。另外,沉淀前驱体在800℃煅烧得到的超细氧化钇粉体中残留较多的非晶相,造成粉体烧结致密化程度降低;在1000℃煅烧时可以完全消除粉体中的非晶体相,所得到的超细球形粉体颗粒的烧结温度低,致密化程度高。The influence of precipitating reaction pH end point,aging time,calcinating temperature of the precipitates precursors on morphologies and sinterability of ultrafine Y2O3 powders was investigated using ammonium hydrogen carbonate as precipitating agent.When the precipitating precursor was aged in the solution of pH =7.0 and 7.8 with prolonged aging time,the corresponding calcined powders grew into nearly spherical shape and showed good sinterability.As it was aged in solution of pH=8.3,the particles would grow tremendously with irregular shape,and as-sintered density of which using these particles decreased with long aging time.In addition,when the precipitate precursor was calcined at 800 ℃,lots of amorphous phase would be left among the ultrafine Y2O3 powders which resulted in lower density of the sintered parts.As calcining temperature increased up to 1000 ℃,the resulted ultrafine crystalline Y2O3 powders wherein amorphous particles were completely eliminated showed characters of low sintering temperature and high sinterability.

关 键 词：氧化钇 超细粉体 陈化处理 粉体形态 烧结性 稀土 

分 类 号：TB321[一般工业技术—材料科学与工程] TQ174.6[化学工程—陶瓷工业]