Difference evaluation on ablation behaviors of ZrC-based and ZrB2-based UHTCs coatings

• DOI: 10.1016/j.corsci.2020.109181
• Publication Date: 2020-12-07T11:14:19Z
• Authors: Xueting Xu; Xiaohui Pan; Yaran Niu; Hong Li; Dewei Ni; Shangsong Huang; Xin Zhong; Xuebin Zheng; Jinliang Sun
• Keywords: 0103 physical sciences; 01 natural sciences

Abstract In the present work, five kinds of UHTCs coatings (ZrC, ZrC-SiC, ZrB2, ZrB2-SiC, ZrB2-ZrC-SiC) were fabricated. The difference of ablation behavior between ZrB2- and ZrC-based coatings was evaluated and focused on. The microstructure evolution of resulted oxide layer were characterized in detail. The results showed that the ablation resistance of ZrB2-based coating was better than that of ZrC-based coating under the same environment, exhibiting lower surface temperature, thinner thickness of both the total oxide layer and the SiC-depleted layer. The possible reasons for the phenomena were supposed based on microstructure characters and thermodynamic analysis.