中文摘要：

保护碳材料免受氧化的伤害，原文如此，涂层在碳 / 碳(C/C ) 上被准备由化学蒸汽反应的 composites 和石墨。涂层获得了的 SEM 和 XRD 分析表演由组成原文如此谷物并且微水晶。涂的样品的氧化行为上的不同的碳底层的影响被调查，然后他们的氧化机制被学习。氧化测试证明原文如此涂的石墨在高温度(1 623 K 和 1 823 K ) 比原文如此涂的 C/C composites 有一个更好的氧化电阻。在氧化过程，原文如此涂的 C/C composites 的氧化曲线是线性的，当那些原文如此涂的石墨跟随一种伪寓言的方式时。当后者被氧散开基于试验性的结果控制时，前者的氧化机制被化学反应控制。氧化行为和机制的变化原文如此，二种碳底层上的涂层首先被贡献他们的结构差别。

英文摘要：

To protect carbon materials from oxidation, SiC coatings were prepared on carbon/carbon（C/C） composites and graphite by chemical vapor reaction. SEM and XRD analyses show that the coatings obtained are composed of SiC grains and micro-crystals. The influence of different carbon substrates on oxidation behavior of coated samples was investigated, and then their oxidation mechanisms were studied. Oxidation test shows that the SiC coated graphite has a better oxidation resistance than SiC coated C/C composites at high temperatures （1 623 K and 1 823 K）. In the oxidation process, the oxidation curves of SiC coated C/C composites are linear, while those of SiC coated graphite follow a quasi-parabolic manner. The oxidation mechanism of the former is controlled by chemical reaction while the latter is controlled by oxygen diffusion based on the experimental results. The variation of oxidation behavior and mechanism of SiC coatings on two kinds of carbon substrates are primarily contributed to their structure differences.