摘要
研究了不同稀土氧化物添加剂对ＳｉＯ２碳热还原氮化制备Ｓｉ３Ｎ４粉料作用机理。结果表明，稀土氧化物（Ｌａ２Ｏ３、ＣｅＯ２、Ｙ２Ｏ３、Ｌａ２Ｏ３＋Ｙ２Ｏ３等）添加剂促进氮化，且制备的Ｓｉ３Ｎ４粉料，颗粒细，含α－Ｓｉ３Ｎ４较高，是一种有开发前景的添加剂。
The mechanism for the effect of RE oxide additions on the Si3N4 powder formation by carbon reducing silica in nitrogen atmosphere was investigated. The results show that RE oxide addition,such as La2O3, CeO2 , Y2O3, La2O3+Y2O3 and so on, be classed with the first group of additions,made the liquid formation temperature in the Si-RE-O-N system being higher than its nitriding temperature and accelerated the rate of nitridation by the REn+ intreduced into Si-O network and made the nitriding time shortented more than 1/3. These RE oxide additions are satisfactory for prepareing superfine Si3N4 powder containing higher α- phase, they are one kind of additions within prospect.
出处
《中国稀土学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第2期128-132,共5页
Journal of the Chinese Society of Rare Earths
