粘土碳热还原氮化合成β′-Sialon粉末的研究  

RESEARCH ON SYNTHESIS OF β′-SIALON POWDER FROM CLAY BY CARBOTHERMAL REDUCTION-NITRIDATION

作　　者：曹林洪[1] 蒋明学[2] 郝英[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621002 [2]西安建筑科技大学材料学院,陕西西安710055

出　　处：《西南工学院学报》2001年第4期29-32,共4页Journal of Southwest China Institute of Technology

基　　金：冶金部"八.五"攻关项目

摘　　要：本文利用失重和XRD研究了工艺条件 (合成温度、保温时间和氮气分压 )对粘土碳热还原氮化合成 β′ -Sialon粉末的影响。研究结果表明 :适当提高合成温度和延长保温时间 ,适当减小氮气分压 ,有利于 β′ -Sialon的形成。β′ -Sialon形成过程的分析表明 :碳热还原氮化反应主要受中间产物CO和SiO的控制。The influence of technological condition including temperature of synthesis and heat preservation time and partial pressure of nitrogen gas on synthesis of β′-Sialon powder from clay by carbothermal reduction-nitridation has been researched with weightlessness and XRD. It was shown that the optimal technological condition on synthesis of β′-Sialon included properly synthesis temperature raised and heat preservation time extended ,and properly of nitrogen gas decompressed. The analysis of the formation process of β′-Sialon has been discussed. It was shown that the carbothermal reduction-nitridation reaction has been mainly controlled by the additional product--CO and SiO.

关 键 词：粘土 β′-Silalon 碳热还原氮化 合成工艺 Β-SI3N4 四氮化三硅 高温陶瓷材料 

分 类 号：TQ174.758.1[化学工程—陶瓷工业]