Abstract
In the present work, the ablation behavior of four kinds of ZrB2-based composite coatings with different SiC/TaSi2 contents was evaluated by a plasma flame at 1750–2000 ℃. The types of oxidation products, as well as their formation processes and influence were analyzed based on microstructure characterizations and thermodynamic calculations. The results show that obvious ablation/oxidation-resistance differences of ZrB2-SiC-TaSi2 coatings were detected. The coating of low TaSi2 content was characterized with the disappearance of SiC-depleted region and the formation of a dense intermediate oxide layer, exhibiting better ablation resistance, while the increase of TaSi2 deteriorated the ablation resistance, which conduced to the formation of oxidation layers with loose structure.
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