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Ca-α-Sialon的反应致密化

周艳平; 庄汉锐; 温树林   

  1. 中国科学院上海硅酸盐研究所 上海 200050
  • 收稿日期:1998-01-20 修回日期:1998-02-17 出版日期:1999-02-20 网络出版日期:1999-02-20

The Reaction Densification of Ca-α-Sialon

ZHOU Yan-Ping; ZHUANG Han-Rui; WEN Shu-Lin   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-01-20 Revised:1998-02-17 Published:1999-02-20 Online:1999-02-20

摘要: 本文通过反应热压制备了单相Ca-α-Sialon材料,研究了Ca-α-Sialon形成的反应致密化过程.不同温度下产物的XRD结果表明,1250℃样品开始软化,1300℃时体系中反应形成了钙铝黄长石相,1500℃时钙铝黄长石重新溶解于液相中,同时形成了Ca-α-Sialon,1600℃时反应完全,原料中各相完全消失,形成了单相Ca-α-Sialon.不同温度下产物的密度表明,伴随着上述反应形成过程,材料经过颗粒重排、溶解-反应-沉淀过程和晶粒生长三个阶段,通过液相烧结达到了致密化.

关键词: Ca-α-Sialon, 反应过程, 致密化

Abstract: Ca-α-Sialon was synthesized by hot-pressing technique, and the reaction sequences and densification of Ca-α-Sialon vs
sintering temperature were studied. It was found that Ca-α-Sialon is stable. At 1250℃ the reactant mixture started to soften, and at 1300℃ gehlenite was produced
in the system; and at 1500℃ gehlenite was resolved into liquid phase and at the same time Ca-α-Sialon formed; and at 1600℃ the reaction of formation of Ca-α-Sialon
was finished and single phase Ca-α-Sialon was got. Accompanied by the above sequences, the densification was finished by liquid
sintering through particle rearrangement, solution-reprecipitation, grain growth。

Key words: Ca-α-Sialon, reaction sequences, densification

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