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含氮稀土黄长石固溶体的反应行为研究

成薇; 王佩玲; 贾迎新   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室; 上海 200050
  • 收稿日期:1996-09-24 修回日期:1996-10-09 出版日期:1997-10-20 网络出版日期:1997-10-20

Study on Reaction Behaviour of Nitrogen-containing Rare Earth Melilite Solid Solutions

CHENG Wei; WANG Peiling; JIA Yingxin   

  1. The State Key Lab on High Performance Ceramics and Superfine Micerostructure; Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China
  • Received:1996-09-24 Revised:1996-10-09 Published:1997-10-20 Online:1997-10-20

PDF (PC)

781

被引次数

4

摘要： 用无压烧结工艺，在1500～1750℃制备了含氮稀土黄长石固溶体R2Si3-xAlxO3＋xN4-x（R＝Nd，Dy,x＝0,0.3，0.6,1.0;R=Yb，x=0，0．3）．研究了配料组份在这些温度下的反应行为．结果表明，从轻稀土Nd至重稀土Yb，均能生成黄长石或它的固溶体，它们的含量随烧结温度的提高而增加，但稀土黄长石及固溶体的形成能力随稀土高于半径的减少而变弱，表现在轻稀土配料组份可以在低至1500℃得到以黄长石或固溶体为主的化合物，而中、重稀土则需分别提高烧结温度至1700℃及1750℃．文中对稀土黄长石固溶体反应过程中出现的其他相及影响反应行为的一些因素进行了讨论．

关键词: 稀土, 黄长石, 反应行为

Abstract: Nitrogen-containing rare earth melilite solid solutions R2Si3-xAlxO3+xN4-x(R=Nd,Dy, x=0, 0.3, 0.6, 1.0, R=Yb, x=0, 0.3) were prepared at the temperatures
ranged from 1500℃ to 1750℃ for 2h by pressureless sintering　technique. The reaction sequences of these compositions at the sintering temperatures
were studied. The results showed that nitrogen-containing rare earth (from Nd to Yb) melilite or its solid　solutions can be formed and their amounts in the sintered samples increase with increasing
the temperatures. However, the formation abilities of melilite solid solutions　become weak with decreasing the ionic radii of rare earth elements, i.e. light rare earth melilite solid solutions can be formed as a major phase
at the temperature as low as 1500℃, however, for midium and heavy　rare earth it needs to increase the temperature to 1700℃ and 1750℃
respectively. The other phases to occur in the sintered samples and the factors to affect the formation behaviour of melilite solid solutions were also discussed in the paper.

Key words: rare earth, melilite, reaction behaviour