Multilayer oxidation resistant coating for SiC coated carbon/carbon composites at high temperature

作者：He Jun Li^*; Geng Sheng Jiao; Ke Zhi Li; Chuang Wang

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2008, 475(1-2): 279-284.

DOI：10.1016/j.msea.2007.04.053

• carbon/carbon composites
• coating
• oxidation

To prevent carbon/carbon (C/C) composites from oxidation, a multilayer coating based on molybdenum disilicide and titanium disilicide was formed using a two-step pack cementation technique in argon atmosphere. XRD and SEM analysis showed that the internal coating was a bond SiC layer that acts as a buffer layer, and that the external multilayer coating formed in the two-step pack cementation was composed of two MoSi2-TiSi2-SiC layers. This coating, which is characterized by excellent thermal shock resistance, could effectively protect the composites from exposure to an oxidizing atmosphere at 1773 K for 79 h. The oxidation of the coated C/C composites was primarily due to the reaction of C/C matrix and oxygen diffusing through the penetrable cracks in the coating.

• 出版日期2008-2-25
• 单位西北工业大学