Ablation Resistance and Mechanisms of Non‐Equimolar (HfZrTaTiY)B2 Under Cyclic Oxyacetylene Flame Conditions.
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| Title: | Ablation Resistance and Mechanisms of Non‐Equimolar (HfZrTaTiY)B |
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| Authors: | Pan, Zhaowei1,2,3 (AUTHOR), Ma, Zhuang1,2,3 (AUTHOR), Liu, Yanbo1,2,3 (AUTHOR) boobbyy@163.com, Liu, Shaopu1,2,3 (AUTHOR), Tian, Xinchun1,2,3 (AUTHOR), Zhu, Shizhen1,2 (AUTHOR), Liu, Ling1,2 (AUTHOR), Wang, Ziyan1,2,3 (AUTHOR), Li, Yinglu1,2,3 (AUTHOR), Xie, Zhuohang1,2,3 (AUTHOR) |
| Source: | Journal of the American Ceramic Society. Jul2026, Vol. 109 Issue 7, p1-13. 13p. |
| Subjects: | Ultra-high-temperature ceramics, Eutectic structure, Flame temperature, Oxide coating, Thermal stability, Sintering |
| Abstract: | To explore ultra‐high temperature ceramics (UHTCs) with improved ablation resistance, a novel non‐equimolar high‐entropy diboride (HfZrTaTiY)B2 and equimolar (HfZrTaTi)B2 ceramic bulks were fabricated by spark plasma sintering (SPS). Their ablation behaviors were evaluated under cyclic oxyacetylene flame conditions at a heat flux of 4.18 MW/m2 (maximum temperature ∼2100°C). By comparison, the non‐equimolar design and the introduction of element Y further enhance the ablation resistance of the bulk material as well as the thermal stability of its surface oxide layer, resulting in a mass ablation rate of −0.039 mg/s and a linear ablation rate of −0.088 µm/s. Notably, a pronounced eutectic‐like structure is observed in the oxide scale during cyclic ablation. The clarification of this eutectic precipitation behavior may aid in interpreting ablation morphologies in other multi‐component UHTCs. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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