STUDY OF THE OXIDATION KINETICS OF A3-3 CARBON/CARBON COMPOSITES
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摘要: 本文采用等温氧化实验方法,在800～1000℃、氧分压21.3kPa的条件下研究了A3-3碳/碳复合材料的氧化动力学行为;借助质谱全元素分析技术研究了杂质催化对其氧化速率的影响,并利用扫描电镜观察分析了氧化反应前后A3-3碳/碳复合材料的表面形貌。研究结果表明:A3-3碳/碳复合材料在氧化时,其氧化速率开始时随氧化失重和氧化时间的增加而迅速增大,然后趋向一个稳定值;其稳定氧化速率为:r=119exp(-15613/RT)mg/cm2·h;此时,其氧化速率不受杂质催化的影响,其抗氧化能力与氧化时间和氧化失重无关;影响A3-3碳/碳复合材料抗氧化能力的主要因素是酚醛树脂炭的抗氧化能力。Abstract: The oxidation kinetics of A3-3 carbon/carbon composites was investigated at temperatures between 800~1000 C, and the experimental oxygen partial pressure was 21.3kPa.The experiment results showed that the oxidation rate of A3-3 carbon/carbon composites increases suddenly at first and then reaches a steady point. The steady oxidation rate could be expressed as r=119exp(-15613/RT)mg/cm2·h,and is not influenced by its doping elements. Otherwise,the oxidation resistance of A3-3 carbon/carbon composites is mainly determined by the carbon derived from the PF resin.
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Key words:
- carbon/carbon composites /
- oxidation kinetics /
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