工艺因素与配料组成对碳热还原氮化合成O′-sialon粉的影响  

INFLUENCE OF PROCESS PARAMETERS AND INITIAL COMPOSITION ON SYNTHESIS OF O′-SIALON POWDER BY CARBOTHERMAL REDUCTION-NITRIDATION

作　　者：杨建[1] 薛向欣[1] 郝力[1] 刘欣[1] 王文忠[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《硅酸盐学报》2003年第6期575-580,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金 ( 5 98740 12 );教育部高等学校骨干教师计划基金 (教技司 [2 0 0 0 65 ] );辽宁省科学技术基金( 0 0 2 0 0 9)资助项目

摘　　要：以纳米SiO2 ,Al(OH) 3和碳黑为原料 ,采用碳热还原氮化法合成了O′sialon粉 ,用XRD对产物进行了相分析 ,研究了合成温度、埋粉条件、N2 流量、配料组成等对合成的影响。结果表明 :合成温度对O′sialon的合成影响显著 ,随合成温度升高 ,产物中O′sialon相含量增大 ,14 0 0℃时O′sialon含量达最大 ,是最佳的合成温度。Si3N4+SiO2 埋粉对产物物相无明显积极影响 ,并导致更大的质量损失。 2 0ml/min是比较合适的N2 流量 ,对O′sialon的合成最有利。 14 0 0℃时配料组成的变化对产物物相组成的影响比 135 0℃时显著 ,C含量的增加促进碳热还原氮化反应的进行 ,C过量将导致O′sialon转化为 β′ sialon 。With nano SiO2, Al(OH)3 and carbon black as raw materials, O′-sialon powder was synthesized by carbothermal reduction-nitridation (CRN). The phase composition of reaction products was determined by XRD. The influence of synthesis temperature, selection of protective powder, N2 flow rate and initial composition on the synthesis was studied. The results show that the synthesis temperature affects the formation of O′-sialon significantly. The content of O′-sialon in the products increases with the increase of synthesis temperature, reaching the maximum at 1400°C, which is assumed to be the optimum synthesis temperature. The positive effect of Si3N4+SiO2 protective powder is not as obvious as expected and larger mass loss of samples is aroused. 20 ml/min is an appropriate N2 flow rate, which is most favorable for the synthesis of O′-sialon. While the initial composition is varied, the influence of it on the phase composition at the synthesis temperature of 1400°C is more dramatic than that at 1350°C. An increase of C content in the initial composition will promote the CRN process, and an excess of C will lead to the conversion of O′-sialon to β′-sialon. The best results are obtained with a stoichiometric content of C.

关 键 词：O′-sialon 碳热还原氮化 合成 工艺因素 

分 类 号：TQ174.58[化学工程—陶瓷工业]