摘要
本文研究了不同温度(773~1173K)条件下,毡基碳/碳复合材料的氧化动力学行为,并利用扫描电镜观察分析了不同氧化程度的碳/碳复合材料显微组织。实验结果表明:毡基碳/碳复合材料在各温度下氧化速度均不随时间而变化。在高于和低于873K时,其氧化机制不同,二者的活化能分别为128kJ/mol和96kJ/mol;同时,碳/碳复合材料氧化过程中。碳毡优先氧化,随着氧化过程进行到后期,基体碳氧化程度加剧。另一方面,毡基碳/碳复合材料的氧化速度主要受该材料的表面反应、气体扩散、催化剂等因素的影响。
In this paper,the kinetics of air oxidation of felt base carbon/carbon composites is investigated at different temperatures(773~1173K). With the help of SEM, the micrographs of carbon/carbon composites are studied after different degrees of oxidation. The experimental results are shown that the oxidation rate of felt base carbon/carbon composites is a constant at a given temperature. When the oxidation temperature is below and above 873k,the oxidation mechanisms of carbon/carbon composites are different and their apparent activation energies are 96 kJ/mol and 128 kJ/mol respectively. During the carbon/carbon composites oxidation initial stage, carhon felt is oxidized much more rapidly than matrix carbon,while during the carbon/carbon composites oxidation final stage, oxidation rate of matrix carbon increases.Otherwise,the oxidation rate of felt base carbon/carbon composites is influenced by the carbon/carbon composite surface reaction rate,the gas phase diffusion aud the catalysts.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
1994年第1期9-14,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金与航空科学基金资助项目
关键词
复合材料
基体碳
碳毡
氧化
动力学
s carbon/carbon composites,carbon felt,matrix carbon,oxida-tion,kinetics