煅烧气氛对Y_2O_3纳米粉体性能的影响  

The effects of the calcination atomosphere on the properties of nano-sized Y_2O_3 powders

作　　者：付仲超[1] 李晓东[1] 何娇[1] 朱琦[1] 李继光[1] 孙旭东[1] 

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

出　　处：《功能材料》2015年第8期8124-8127,8132,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51172037);教育部新世纪优秀人才支持计划资助项目(NCET-11-0076);中央高校基本科研业务专项资金资助项目(N130810003;N130610001;N110802001)

摘　　要：分别研究了在O2气氛或H2气氛下煅烧预处理,对Y2O3粉体性能的影响。用BET、XRD、SEM和TMA对粉体形貌和特性进行了分析。结果表明,煅烧气氛不仅会影响粉体颗粒尺寸,也同时会影响到粉体的团聚状态;O2煅烧后粉体为纯立方相Y2O3,粉体颗粒近似球形,具有较小的粒径、较好的分散性,等升温速率烧结时具有较低的最大收缩速率温度;H2气氛下在大于1 050℃对粉体煅烧,不仅粉体颗粒尺寸显著长大,同时粉体颗粒也会发生严重的团聚。在O2气氛下1 100℃煅烧的粉体颗粒尺寸约80 nm,同时团聚系数也最小,更有利于获得易烧结的Y2O3粉体。The effects of the calcination atmosphere on the property of Yttria nanopowders were investigated. The yttria powder were calcinated in O2 and H2atmospheres respectively at various temperatures,and the properties of the powders were characterized by using BET,XRD,SEM and TMA measurements. The results show that powders calcinated in O2 atmosphere are of cubic phase,and are composed of near spherical particles with smaller particle size and good dispersity. Besides,the powders show lower temperature of maximum shrinkage rate under CRH sintering. On the other hand,the powders calcinated in H2 atmosphere contain a trace amount of hexagonal structure YO1. 458. The particles are severely aggregated when calcinated at temperatures greater than 1 050 ℃,due to the occurrence of sintering between particles.Present investigation indicated that calcination in O2 is preferable to the preparation of sinterable Y2O3 powders.

关 键 词：Y2O3 纳米粉体 煅烧气氛 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]