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摘要: 对二维炭/炭（2D C/C）复合材料在700℃～1300℃温度范围内的微氧化（氧化失重率小于6%）行为进行了研究，并采用SEM和千分尺等仪器考察了氧化前后C/C复合材料的组织结构和宏观尺度的变化，分析了微氧化对材料组织结构及试样宏观尺度（即试样的体积）的影响规律。结果表明：在700℃～1300℃温度范围内，2D C/C复合材料的微氧化行为服从线性规律，且氧化速率随温度的升高而增大。同时，随温度的升高，微氧化区域由材料的表面层区和近表面层区向材料的外表面和表面层区集中，微氧化程度加剧，而微氧化深度减小；宏观表现为试样表面处的纤维/基体界面分离明显化和纤维端头的锐化，以及C/C复合材料的体积下降。
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关键词:
- 炭/炭复合材料，微氧化，组织结构
Abstract: The effect of low-level oxidation, defined as a weight loss less than 6% at 700℃-1300℃, on microstructure and volume change of 2D carbon/carbon (C/C) composites was measured by SEM and a micrometer. Results indicated that the oxidation rate of the C/C composites was linear. Higher temperature favored for surface oxidation, which leaded to an increased burn-off but a thinner oxidized layer. Lower temperature, however, favored in-depth oxidation, which led to a decreased burn-off but a thicker oxidized layer. Separation of the carbon fibers from the substrate could be seen, The tips of the fibers were sharpened and the volume of the composites decreased. -
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