Invited Speaker

Assoc. Prof. Xiaofei Zhu

Xidian University

E-mail: zhuxiaofei@xidian.edu.cn

Title: Preparation of Hafnium Tantalum Based Carbide Solid Solution Coating and Study on Its Ablation Resistance Properties

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Abstract:

The single-phase solid solution of hafnium tantalum carbide is expected to meet the urgent demand for thermal protection materials for the hot end components of remote hypersonic aircraft due to its ultra-high temperature melting point (above 3900 ℃) and erosion resistance. However, the single-phase solid solution coating of hafnium tantalum carbide prepared by traditional methods has low solid solubility and poor density. To address this issue, this paper first studied the effects of three powder preparation processes on the structural properties of spray coatings, revealed the microstructure evolution law and solid solution mechanism inside the particles, determined the step-by-step plasma preparation process of IPS-VPS, and obtained HfTaC solid solution coatings with improved density and solid solubility. Explored the effect of WC doping on the mechanical and ablative properties of ceramics and coatings. The results showed that WC doping can further improve the solubility, density, and mechanical properties of ceramic coatings. After 120 seconds of oxyacetylene ablation at a heat flux density of 2.38mW/m2, the hafnium tantalum tungsten carbon solid solution coating exhibited excellent anti ablation performance compared to the non WC doped hafnium tantalum carbon coating. The evolution law of coating ablation structure performance was analyzed, and the oxidation ablation protection mechanism of hafnium tantalum based carbide coating was elucidated.