中文摘要：

介绍了空间氧化环境和低温环境对C／SiC复合材料性能的影响。研究表明：空间原子氧环境对C／C-SiC材料中的C相剥蚀严重；原子氧氧化对C／SiC复合材料的力学性能影响较小。原子氧与分子氧的叠加氧化对C／SiC复合材料的性能影响较大。在空间低温条件下，C／SiC复合材料的拉伸强度会先降低，然后又逐渐恢复；该材料破坏模式与其高温条件下的破坏模式相同。同时提出了当前研究中存在的问题，并展望了未来的研究方向。

英文摘要：

The behaviors of the C/SiC composites under the space environment are introduced, including atomtc oxygen and cryogenic conditions. Related researches show that the carbon phase in the C/C-SiC composites is sensitive to the atomic oxygen. The atomic oxygen has little influence on the mechanical properties of the C/SiC composites. The coupled oxidation by atomic oxygen and oxygen show a serious degradation upon the C/SiC composites. Under the cryogenic environment in the space, the tensile strength of the C/SiC composites will be reduced, and then recovered. And its damage mode is similar to that in the high temperature. Meanwhile, the weakness of the current research is put forward, and the future direction in this field is proposed.