4.7 Article

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

期刊

CORROSION SCIENCE
卷 180, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109181

关键词

ZrC; ZrB2; Coatings; Ablation; Oxidation

资金

  1. National Key R&D Program of China [2018YFB0704400]
  2. Shanghai Technical Platform for testing on inorganic materials [19DZ2290700]

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The study found 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. Possible reasons for these phenomena were speculated based on microstructure characters and thermodynamic analysis.
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.

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