Anti-oxidation property of a multi-layer coating for carbon/carbon composites in a wind tunnel at 1500 degrees C

作者：Fu Qian-gang^*; Xue Hui; Li He-jun; Li Ke-zhi; Shi Xiao-hong; Zhao Hua

来源：New Carbon Materials, 2010, 25(4): 279-284.

DOI：10.1016/S1872-5805(09)60033-0

• Carbon-carbon composites
• Coating
• Fracture

To protect carbon/carbon (C/C) composites against oxidation at 1500 degrees C in a wind tunnel, a multi-layer coating was prepared on them by a combination of pack cementation, chemical vapor deposition and slurry coating. Xray diffraction, scanning electron microscopy and energy dispersive spectroscopy were used to analyze the phase, microstructure and elemental distribution of the coating. Results show that a three-layer structure is formed including a multiphase MoSi2-SiC-Si inner layer, a SiC middle layer and a borosilicate glass outer layer with thicknesses of about 80, 20 and 80 p,m, respectively. The three-layer coating can protect the C/C composites from failure at 1500 degrees C for 53 h in a wind tunnel. The cracking of the coating by thermal shock and gas-fired impact is the main cause for the failure of the coating.

• 出版日期2010-8
• 单位西北工业大学