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DOE OSTI · 3001040

Microstructure, mechanical, and thermal properties of compositionally complex (Hf,Zr,Nb,Ti)B 2 ‒LaB 6 ceramics

Chen, Xin [Univ. of Nebraska, Lincoln, NE (United States)]·Trinh, Lanh [Univ. of Nebraska, Lincoln, NE (United States)]·Hua, Zilong [Idaho National Laboratory (INL), Idaho Falls, ID (United States)] (ORCID:0000000229423344)·Wang, Fei [Univ. of Nebraska, Lincoln, NE (United States)]·Zhang, Xiang [Univ. of Nebraska, Lincoln, NE (United States)]·Yoo, Yongchul [Univ. of Nebraska, Lincoln, NE (United States)]·Bawane, Kaustubh [Idaho National Laboratory (INL), Idaho Falls, ID (United States)]·Lu, Yongfeng [Univ. of Nebraska, Lincoln, NE (United States)]·Cui, Bai [Univ. of Nebraska, Lincoln, NE (United States)] (ORCID:0000000205856698)
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Abstract

Novel compositionally complex borides, (Hf,Zr,Nb,Ti)B 2 and (Hf,Zr,Nb,Ti)B 2 ‒LaB 6 , were fabricated using spark plasma sintering process. (Hf,Zr,Nb,Ti)B 2 ‒LaB 6 exhibits a dual-phase microstructure, in which (Hf,Zr,Nb,Ti)B 2 is a primary phase with the hexagonal structure and LaB 6 is a secondary phase with a cubic structure. The mechanical properties of both (Hf,Zr,Nb,Ti)B 2 and (Hf,Zr,Nb,Ti)B 2 ‒LaB 6 are comparable, with a combination of high hardness and moderate fracture toughness. Thermal diffusivity and conductivity of (Hf,Zr,Nb,Ti)B 2 are much lower than the individual transition metal borides but are significantly increased by the addition of LaB 6 . Herein, it is implied that the thermal properties of boride ceramics can be controlled through the appropriate design of principal metal element compositions.

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boridescompositionally complex ceramicshardnessspark plasma sinteringthermal conductivity

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Chen, Xin [Univ. of Nebraska, Lincoln, NE (United States)], Trinh, Lanh [Univ. of Nebraska, Lincoln, NE (United States)], Hua, Zilong [Idaho National Laboratory (INL), Idaho Falls, ID (United States)] (ORCID:0000000229423344), Wang, Fei [Univ. of Nebraska, Lincoln, NE (United States)], Zhang, Xiang [Univ. of Nebraska, Lincoln, NE (United States)], Yoo, Yongchul [Univ. of Nebraska, Lincoln, NE (United States)], Bawane, Kaustubh [Idaho National Laboratory (INL), Idaho Falls, ID (United States)], Lu, Yongfeng [Univ. of Nebraska, Lincoln, NE (United States)], Cui, Bai [Univ. of Nebraska, Lincoln, NE (United States)] (ORCID:0000000205856698). 2025-09-17. Microstructure, mechanical, and thermal properties of compositionally complex (Hf,Zr,Nb,Ti)B 2 ‒LaB 6 ceramics. https://doi.org/10.1111/ijac.70068

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