化学气相反应法合成SiC超细粉的成核和生长过程的研究  

STUDIES OF NUCLEATION AND GROWTH OF SiC ULTRAFINE POWDERS SYNTHESIZED BY CHEMICAL VAPOUR REACTION

作　　者：杨修春[1] 韩高荣[1] 杜丕一[1] 丁子上[1] 

机构地区：[1]浙江大学材料科学与工程系

出　　处：《硅酸盐学报》1997年第3期332-338,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金

摘　　要：借助于ＴＥＭ观察，讨论了化学气相反应法合成ＳｉＣ超细粉的成长机理，分析结果显示，由于气体流速不同，合成的ＳｉＣ超细粉颗粒尺寸和颗粒形貌有较大变化，颗粒尺寸和颗粒形貌的变化由成核和生长机理决定，一般涉及到均匀成核、异相成核。The formation mechanism of solid particle and porous particle synthesized by chemical vapour reaction was investigated experimentally through TEM photographic observation.Particle size became larger when total flow rate decreased.It was difficult to get SiC particles below 5nm.SiC particles with about 10nm in size and with low aggregation were synthesized under 1000mL/min.Particles grow and deform after the homogeneous nucleation through heterogeneous nucleation,coagulation,and occasional remelting.

关 键 词：化学气相反应 超细粉 碳化硅陶瓷 成核 

分 类 号：TQ174.758[化学工程—陶瓷工业]