Catalytic properties of ZrB2_SiC_W ultra_high temperature ceramics at moderate temperatures

3rd International Conference on New Material and Chemical Industry

材料科学;化学工业

Li, N.^1 ; Hu, P.^2 ; Xing, P.F.^1 ; Ke, B.^1

Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang

621900, China^1

National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin

150001, China^2

关键词: Catalytic properties;    Moderate temperature;    Photochemical method;    Recombination coefficient;    Recombination reactions;    Spectral diagnostics;    Surface microstructures;    Ultra-high-temperature ceramics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/479/1/012067/pdf
DOI  :  10.1088/1757-899X/479/1/012067

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Catalytic behaviors related to recombination reactions of dissociated oxygen atoms on the surface of ZrB2-SiC-W ultra-high temperature ceramic was investigated quantitatively in the temperature ranges from room temperature to 1300 K, and recombination coefficient can be obtained by the photochemical method based on spectral diagnostic techniques using microwave-discharge plasma apparatus. Oxidation of specimens even at relatively low temperature during the experiment had a significant influence on the catalytic properties of ZrB2-SiC-W ultra-high temperature ceramics, and the results revealed the detectable dependence of the catalytic properties upon environment-induced surface modification. The relationship between catalytic properties of ZrB2-SiC-W ultra-high temperature ceramics and surface microstructure was also discussed in detail.