Abstract
In order to improve the thermal protective ability of HfB2-SiC coating, TaSi2 was introduced into the coating and its function on long-term ablation resistance was investigated by plasma ablation tests under two heat fluxes. The variations in ablation behavior and structural evolution of the coatings under low and high heat fluxes were elaborated. The results indicated that TaSi2 significantly improved the ablation resistance of HfB2-SiC coating due to the alleviation of volume expansion when the ablation temperature was above the melting point of Ta2O5 (~1872 ℃). However, the results are reversed when the temperature was below the fusing point. The reasons for the variation were explained by the effect of temperature on the active oxidation of SiC and the oxidation behavior of TaSi2. The improvement of the ablation resistance also can be attributed to the avoidance of the SiC-depleted region and the formation of Hf-Ta-Si-B-O compound glassy layer with low oxygen permeability and high viscosity.
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