GROWTH CHARACTERSAND MODEL OF PYROLYTIC CARBON IN CHEMICAL VAPOR INFILTRATION PROCESS

作     者：侯向辉 李贺军 张守阳 陈轶希 沈健 

作者机构：CollegeofChemistryandChemicalEngineeringNanjingUniversityNanjing210093China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2000年第13卷第2期

页      面：112-117页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：National Natural Science F oundation of China !( No.5 9882 0 0 4) 

主　　题：pyrolytic carbon chemical vapor infiltration carbon carbon composites 

摘      要：Chemical Vapor Infiltration (CVI) processes are the essential techniques for fabrication of high performance carbon carbon composites. Based on the polarized light and scanning electron analysis, the authors study the micro morphology and texture characteristics of pyrolytic carbon deposited in CVI process, as well as the growth behavior of pyrolytic carbon. The research shows that Rough Laminar (RL) texture has the hierarchical and self similar structural features, which reflects the stage growth and self similar behavior during the growth course of pyrolytic carbon. According to the two growth features, a laminated growth model of pyrolytic carbon is proposed with the concept of Cone Growth Units (CGU). The laminated growth model can provide a fine description for the growth course of RL pyrolytic carbon. The model indicates that formation, developing and combination of local high order structures (such as CGU structures) are the essential factors for the growth of RL texture. Smooth Laminar (SL) texture and ISO carbon come into being with long range orderliness and isotropy structure respectively, which no local high orderliness intermediate involves in.