Abstract
A novel structural Hf-Ti-Si-C multiphase solid solution coating was designed and manufactured by chemical and solid solution reactions to improve the mechanical and ablation behavior of HfC-SiC coatings. Results show that, with TiC addition, the formed HfxTi1−xC and (Ti1−xHfx)3SiC2 solid solutions can significantly enhance the micro-mechanical and ablation properties of the coating. The improved hardness and modulus, as well as the reduced ablation rates are mainly attributed to the optimized structure and solid solution reinforcing effect of coating. Moreover, the Ti-additives are conducive to restrain the active oxidation of SiC. Furthermore, HfTiO2 can reduce the oxides cracking due to the inhibited crystal transformation of HfO2 and its good self-healing ability, forming a dense and stable oxide scale with superior thermal protection.
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