The active-to-passive oxidation transition mechanism and engineering prediction method of C/SiC composites  

作　　者：DENG DaiYing LUO XiaoGuang CHEN SiYuan YU JiJun AI BangCheng 

机构地区：[1]The Institute of Theoretical and Applied Aerodynamics,China Academy of Aerospace Aerodynamics

出　　处：《Science China(Technological Sciences)》2013年第6期1403-1408,共6页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 11172284);the International Science and Technology Cooperative Project from Ministry of Science and Technology (GrantNo. 2013DFA30820)

摘　　要：This paper studied the active-to-passive oxidative mechanism of C/SiC composite under high temperature and oxidative conditions. An analytic model and computational method were established based on the process of gas diffusion in boundary layer and the equilibrium relations in surface chemical reactions. Simultaneously, an engineering equation to predict the oxygen partial pressure of active-to-passive transition was derived under the specific temperature zone. The results indicated that the active-to-passive oxidation transition of C/SiC is closely related to the composition of the material. At certain temperature and oxygen partial pressure conditions, the composite with high carbon content is prone to cause active oxidation which is negative to the oxidation resistance of the material.

关 键 词：C/SIC active oxidation passive oxidation transition mechanism 

分 类 号：TB332[一般工业技术—材料科学与工程]