Ablation behavior of (Zr, Ta)B2-SiC coating on carbon/carbon composites at 2300 °C. (1st August 2021)

• Record Type: Journal Article
• Authors: Tong, Kai; Zhang, Mingyu; Su, Zhean; Wu, Xiaowei; Zeng, Chen; Xie, Xiangmin; Fang, Cunqian; Yang, Cheng; Huang, Qizhong; Huang, Dong
• Is Part Of: Corrosion science. Volume 188(2021)
• Publication Date: 2021-08-01
• Subjects: Ceramic coating -- Solid solution -- Ablation resistance; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109545
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Zr-Ta-B-SiC coatings with different solid solubility of (Zr, Ta)B2 were prepared by pack cementation and slurry method. The microstructure evolution and ablation behavior of Zr-Ta-B-SiC coatings were investigated. The content of tantalum brings a remarkable impact on the surface morphology after ablation. The constitution and micro morphology of Zr-Ta-O layer played a predominant role in ablation resistance. Abstract: Zr-Ta-B-SiC multiphase coating was prepared on carbon/carbon composites by pack cementation and slurry method. The (Zr, Ta)B2 solid solution was found to be the key antiablative component. The ablation behavior suggested that the synthesized Zr0.70 Ta0.30 B2 -SiC coating exhibited the best ablation resistance at 2300 °C. It is asserted that the micromorphology and distribution of Zr-Ta-O in the coating played a vital role in the evolution of the protective layer and ablation performance. A coating with ∼30 % Ta was beneficial for stabilizing the t-ZrO2 phase and alleviating the volume change at high temperature. The formation of a thermal barrier and low volatility of Zr-Ta-O layer were responsible for the excellent ablation resistance.