中文摘要：

保护碳 / 碳(C/C ) 从氧化的 composites，一原文如此，与 SiO2 修改的涂层被一种复杂技术准备。内部原文如此有从 150 ～ 300 m 变化的厚度的涂层由化学蒸汽反应(CVR ) 是开始涂的：准备的一种简单、便宜的技术原文如此经由 siliconizing 的涂层在高温度(1 9232 273 K ) 暴露于混合蒸汽(Si 和 SiO2 ) 的底层。然后，同样准备的涂层被一个蘸并且弄干的过程作为原始资料与 tetraethoxysilane 处理形成 SiO2 充满裂缝和洞。氧化测试显示出那，在在在为 10 h 并且在 1 623 K 和房间温度 5 次之间的热骑车的 1 623 K 的空中的氧化以后， CVR 涂的样品的集体损失直到18.21%，当与修改涂层涂的样品仅仅是5.96%时，展出氧化的明显的改进和涂层的热吃惊抵抗。修改样品的损失主要是的团贡献了 C/C 底层的反应，氧通过在热吃惊测试形成的渗透的裂缝扩散。

英文摘要：

To protect carbon/carbon （C/C） composites from oxidation, a SiC coating modified with SiO2 was prepared by a complex technology. The inner SiC coating with thickness varying from 150 to 300 μm was initially coated by chemical vapor reaction （CVR） a simple and cheap technique to prepare the SiC coating via siliconizing the substrate that was exposed to the mixed vapor （Si and SiO2） at high temperatures （1 923-2 273 K）. Then the as-prepared coating was processed by a dipping and drying procedure with tetraethoxysilane as source materials to form SiO2 to fill the cracks and holes. Oxidation tests show that, after oxidation in air at 1 623 K for 10 h and thermal cycling between 1 623 K and room temperature 5 times, the mass loss of the CVR coated sample is up to 18.21%, while the sample coated with modified coating is only 5.96%, exhibiting an obvious improvement of oxidation and thermal shock resistance of the coating. The mass loss of the modified sample is mainly contributed to the reaction of C/C substrate with oxygen diffusing through the penetrating cracks formed in thermal shock tests.