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无机材料学报

• 研究论文 • 上一篇    下一篇

煤矸石还原氮化合成O’-Sialon及热力学研究

张海军; 刘战杰; 钟香崇   

  1. 郑州大学高温功能材料河南省重点实验室 郑州 450052
  • 收稿日期:2003-09-08 修回日期:2003-11-06 出版日期:2004-09-20 网络出版日期:2004-09-20

Thermodynamic Study and Reduction-nitridation Synthesis of O -Sialon from Coal Gangue

ZHANG Hai-Jun; LIU Zhan-Jie; ZHONG Xiang-Chong   

  1. Henan Key Laboratories of High Temperature Ceramics; Zhengzhou University; Zhengzhou 450052; China
  • Received:2003-09-08 Revised:2003-11-06 Published:2004-09-20 Online:2004-09-20

PDF (PC)

1055

被引次数

40

摘要：

采用拟抛物面规则评估了O’-Sialon、X相的吉布斯生成自由能,并从热力学上分析了O’-Sialon、β-Sialon、X相的合成过程.研究了以中国山西煤矸石为原料,还原氮化合成O’-Sialon的影响因素,包括还原剂(C或者Si)的用量、氮化温度等;结果表明,以金属Si为主要还原剂时O’-Sialon的合成效果较佳,其相对含量最高可以达到80％左右,提高氮化温度有利于O’-Sialon的合成.

关键词: O’-Sialon, 煤矸石, 氮化还原, 热力学, 合成

Abstract: The Gibbs energy values of O’-Sialon and X phase were calculated by the thermodynamic quasi-paraboloid
rule, and the process of synthesizing O’-Sialon, β-Sialon and X phase was analyzed thermodynamically. The effects of technological factors (such as amount of reducing agent added, nitriding temperature etc.)
on the synthesis of O’-Sialon based on coal gangue by the reduction-nitridation method were investigated. The results show that the use of metallic Si powder as reducing agent is more effective in prompting
O’-Sialon formation. About 80% O’-Sialon content may be attained, and the increase in nitriding temperature is advantageous to the synthesis of O’-Sialon.

Key words: O' -Sialon, coal gangue, reduction-nitridation, thermodynamic, synthesis

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