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Journal of Advanced Ceramics 2024, 13(1): 101-112 https://doi.org/10.26599/JAC.2024.9220844
Research Article | Open Access | Issue | Published: 24 January 2024

Improved damage tolerance and oxidation resistance of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2–SiC by introducing chopped carbon fibers

Show Author's Information Feilong Huang,  Hailong Wang( ),  Cheng Fang( ),  Mingliang Li,  Gang Shao,  Jinpeng Zhu,  Yanchun Zhou
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
Keywords:
high-entropy ceramics, oxidation resistance, toughening mechanisms, carbon fibers (Cf)
Cite this article:
Huang F, Wang H, Fang C, et al. Improved damage tolerance and oxidation resistance of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2–SiC by introducing chopped carbon fibers. Journal of Advanced Ceramics, 2024, 13(1): 101-112. https://doi.org/10.26599/JAC.2024.9220844
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Abstract Full text About this article

High-entropy diborides (HEBs) are considered as promising high-temperature structure materials owing to their high melting point and excellent thermal stability. However, the intrinsic brittleness is the main obstacle that seriously limits their practical applications. To overcome with this obstacle, carbon fibers (Cf) with outstanding mechanical properties are used in the present work as a first attempt to improve the damage tolerance of HEBs. The as-prepared Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2–SiC composite (Cf/HEB–SiC) shows high relative density (97.9%) and good mechanical properties with flexural strength of 411±3 MPa and fracture toughness of 6.15±0.11 MPa·m1/2. More importantly, the damage tolerance parameter (Dt) has increased from 0.10 m1/2 for HEB–SiC to 0.29 m1/2 for Cf/HEB–SiC. Through microstructural analysis and Vickers indentation of the composite, the toughening mechanisms are disclosed. The carbon fibers coated with carbon coatings demonstrate unique capacity for prolonging the crack propagation path, which promotes the reliability of the composite effectively. Moreover, the Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2–SiC composite also exhibits good static oxidation resistance in the temperature range of 1100–1500 ℃ in air due to the formation of the protective oxide layer constituting of multicomponent oxides (Zr)HfTiO4 and (Zr)Hf6Ta2O17 embedded in a continuous SiO2 glass. These results are promising, and this primary work can be used as a reference to the synthesis of Cf/HEBs for thermal protection materials under high-temperature serving conditions.


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Improved damage tolerance and oxidation resistance of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2–SiC by introducing chopped carbon fibers

Show Author's information Feilong Huang, Hailong Wang( ), Cheng Fang( ), Mingliang Li, Gang Shao, Jinpeng Zhu, Yanchun Zhou
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

Abstract

High-entropy diborides (HEBs) are considered as promising high-temperature structure materials owing to their high melting point and excellent thermal stability. However, the intrinsic brittleness is the main obstacle that seriously limits their practical applications. To overcome with this obstacle, carbon fibers (Cf) with outstanding mechanical properties are used in the present work as a first attempt to improve the damage tolerance of HEBs. The as-prepared Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2–SiC composite (Cf/HEB–SiC) shows high relative density (97.9%) and good mechanical properties with flexural strength of 411±3 MPa and fracture toughness of 6.15±0.11 MPa·m1/2. More importantly, the damage tolerance parameter (Dt) has increased from 0.10 m1/2 for HEB–SiC to 0.29 m1/2 for Cf/HEB–SiC. Through microstructural analysis and Vickers indentation of the composite, the toughening mechanisms are disclosed. The carbon fibers coated with carbon coatings demonstrate unique capacity for prolonging the crack propagation path, which promotes the reliability of the composite effectively. Moreover, the Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2–SiC composite also exhibits good static oxidation resistance in the temperature range of 1100–1500 ℃ in air due to the formation of the protective oxide layer constituting of multicomponent oxides (Zr)HfTiO4 and (Zr)Hf6Ta2O17 embedded in a continuous SiO2 glass. These results are promising, and this primary work can be used as a reference to the synthesis of Cf/HEBs for thermal protection materials under high-temperature serving conditions.

Keywords: high-entropy ceramics, oxidation resistance, toughening mechanisms, carbon fibers (Cf)

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Received: 15 November 2023
Revised: 13 December 2023
Accepted: 22 December 2023
Published: 24 January 2024
Issue date: January 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 52172075 and 52302074), the Outstanding Youth Foundation of Henan Province (Grant No. 202300410355), the Program for Innovative Research Team in Science and Technology in Universities of Henan Province (Grant No. 23IRTSTHN001), the China Postdoctoral Science Foundation (Grant No. 2021M702931), the Science Foundation of National Key Laboratory of Science and Technology on Advanced Composites in Special Environments (Grant No. JCKYS2022603C024), the Natural Science Foundation of Henan Province (Grant No. 232300421323), and the Henan Provincial Science and Technology Research and Development Plan Joint Fund (Grant No. 222301420031).

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