Oxidation mechanism of SiC–Zirconia–Glass ceramic coated carbon/carbon composites at 1123–1273 K. (July 2017)

• Record Type: Journal Article
• Authors: Wang, Shuqiu; Zeng, Fanhao; Li, Yi; Gu, Yi; Zhang, Fuqin; Xiong, Xiang
• Is Part Of: Materials research bulletin. Volume 91(2017)
• Page Start: 189
• Page End: 196
• Publication Date: 2017-07
• Subjects: Carbon/carbon composites -- Ceramic glass-coating -- Oxidation; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.03.046
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Oxidation mechanism of the coated C/C composites. Early stage (a), mid-stage (b) and later stage (c) of oxidation. Highlights: A new type of SiC–Zirconia–Glass (SZG) coating for C/C composites was designed and prepared by slurry method. The SCG coated C/C composites show excellent anti-oxidation properties at 1123–1273 K. Oxidation mechanisms of the as-produced samples were discussed in detail. Abstract: A novel type of SiC–Zirconia–Glass coating for carbon/carbon(C/C) composites was designed and prepared by slurry method and their microstructure and oxidation behavior at temperatures of 1123–1273 K were investigated. The results show that the weight loss rate of samples was below 1.5% after oxidation of 70 h and have excellent mechanical properties remaining after a 1123–1273 K oxidation process. The relationship between the weight loss rate and oxidation time can be fitted to an exponential curve and the reaction activation energy of diffusion through the coating cracks was 16.68 kJ mol −1 . It was found that the oxidation model of SiC–ZrO2 –Glass coated C/C composites was not exactly follow to Arrhenius's law during temperature of 1123–1273 K and has characteristics of defective oxidation.