Kinetics and Mechanisms of Oxidation of 2D Woven C/SiC Composites: I, Experimental Approach
Kinetics and Mechanisms of Oxidation of 2D Woven C/SiC Composites: I, Experimental Approach
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DOI：
10.1111/j.1151-2916.1994.tb07096.x
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发表时间：
1994-08
影响因子：
3.9
通讯作者：
F. Lamouroux;G. Camus;Jacques Thebault
中科院分区：
文献类型：
--
作者：
F. Lamouroux;G. Camus;Jacques Thebault
通过热重分析和光学/电子显微镜研究了部分用SiC密封涂层保护并在1,600 ℃下在惰性气体中热处理（稳定化）的二维机织C/SiC复合材料的氧化行为。在流动的氧气下进行的测试的结果表明，在氧化动力学和形态演变方面的复合材料的氧化行为与密封涂层以及基体中的热微裂纹的存在有关。存在三种不同的温度域。在低温（1,100 ℃）下，这种扩散机制受到二氧化硅密封微裂纹的限制;因此，复合材料的降解仍然是表面的。对（i）在较低氧含量环境（干燥空气）中的热处理复合材料和（ii）在干燥氧气中的更加工（未稳定）的复合材料的氧化行为的研究证实了所提出的用于解释复合材料的氧化行为的不同机制。«少
The oxidation behavior of a 2D woven C/SiC composite partly protected with a SiC seal coating and heat-treated (stabilized) at 1,600 C in inert gas has been investigated through an experimental approach based on thermogravimetric analyses and optical/electron microscopy. Results of the tests, performed under flowing oxygen, have shown that the oxidation behavior of the composite material in terms of oxidation kinetics and morphological evolutions is related to the presence of thermal microcracks in the seal coating as well as in the matrix. Three different temperature domains exist. At low temperatures ( 1,100 C), such diffusion mechanisms are limited by sealing of the microcracks by silica; therefore, the degradation of the composite remains superficial. The study of the oxidation behavior of (i) the heat-treated composite in a lower oxygen content environment (dry air) and (ii) themore » as-processed (unstabilized) composite in dry oxygen confirms the different mechanisms proposed to explain the oxidation behavior of the composite material.« less