Abstract
A slurry method has good prospects in preparing coatings, yet great challenge to apply dense coatings due to the volatilization of slurry and the inert and pressureless sintering. Here we develop a HfSi2-ZrSi2 modified SiC/ZrB2-SiC/SiC triple-layer coating by an improved slurry method combined with CVD on Cf/SiC composites. The ZrSi2 and HfSi2 are preferentially oxidized in a novel oxygen-containing sintering process so that their generated SiO2 glass can heal defects to achieve self-densification of the coating. Resultantly, the coating presents outstanding interfacial bonding strength of 14.7 MPa and excellent cyclic ablation resistance at 1800 °C for 600 s
Published Version
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