The behavior of coatings and SiC f/SiC composites under thermal shock

• Published in: Journal of nuclear materials Vol. 283; pp. 1077 - 1080
• Main Authors: Yu, Jinnan, Yao, Zhongwen, Yu, Gang, Chu, Fengmin, Tang, Xiuzhang, Zeng, Yi, Noda, Tetsuji
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2000
• Subjects: T03; C06; S09; C09
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/S0022-3115(00)00284-1

The behavior of various coatings and SiC f/SiC composites under thermal shock is described in this paper. The erosion of the SiC f/SiC composites and TiC + TiN coatings under thermal shock is less than that of WC, TiN, TiC and B 4C coatings. The surface of multi-arc ion coating (MAIC) TiC, TiN and TiC + TiN coatings under thermal shock has cracks due to the interface between coating and substrate. The ion beam enhanced deposition (IBED) TiC coatings and plasma spraying coating (PSC) B 4C and WC coatings under thermal shock do not have cracks. It seems that these coatings approximate to three-dimensional heat transfer. The surface of 2D Hi-Nicalon SiC f/SiC composites under thermal shock indicates sublimation and trace melting. The melting region is only presented in the matrix, and the fiber retained its integrity. This means that the matrix has poor thermal diffusivity, especially for interface damage between fiber and matrix.