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Ultra-high-temperature ceramic nanowires have shown increasing potential for use as thermal structural components. Herein, novel single-crystal Hf0.5Ta0.5C solid solution nanowires were synthesized and incorporated with a HfC coating to construct a robust structure with Hf0.5Ta0.5C solid solution nanowires uniformly distributed and interconnected within the coating. The novel Hf0.5Ta0.5C solid solution nanowires could effectively hinder crack propagation through crack tip pinning and crack deflection. This mechanism substantially enhanced the elastic modulus and fracture toughness of the HfC coating by 53.29% and 59.67%, respectively. The toughened HfC coating displayed superior fracture toughness and good interfacial binding strength with the substrate to resist severe oxidation and scouring. Additionally, the high thermal conductivity of the toughened HfC coating promoted heat transmission. Thus, in comparison to the pure HfC coating, the toughened HfC coating displayed smaller mass and linear ablation rates of −0.35 mg·s−1 and −0.46 μm·s−1, which decreased by 39.66% and 36.98%, respectively. Our work not only simultaneously enhances the mechanical properties and ablation resistance of HfC-coated carbon/carbon (C/C) composites but also provides novel prospects for advanced ultrahigh-temperature ceramic nanowires under extreme conditions.


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Novel HfxTa1−xC solid solution nanowire toughened HfC coating: An effective strategy for synchronous enhanced mechanical and anti-ablation performance

Show Author's information Hui Chen1Yulei Zhang1,2( )Yanqin Fu2( )Wenhan Gai1Junhao Zhao1Haohui Zhang1
Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China
Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites, Institute of Carbon Matrix Composites, Henan Academy of Sciences, Zhengzhou 450046, China

Abstract

Ultra-high-temperature ceramic nanowires have shown increasing potential for use as thermal structural components. Herein, novel single-crystal Hf0.5Ta0.5C solid solution nanowires were synthesized and incorporated with a HfC coating to construct a robust structure with Hf0.5Ta0.5C solid solution nanowires uniformly distributed and interconnected within the coating. The novel Hf0.5Ta0.5C solid solution nanowires could effectively hinder crack propagation through crack tip pinning and crack deflection. This mechanism substantially enhanced the elastic modulus and fracture toughness of the HfC coating by 53.29% and 59.67%, respectively. The toughened HfC coating displayed superior fracture toughness and good interfacial binding strength with the substrate to resist severe oxidation and scouring. Additionally, the high thermal conductivity of the toughened HfC coating promoted heat transmission. Thus, in comparison to the pure HfC coating, the toughened HfC coating displayed smaller mass and linear ablation rates of −0.35 mg·s−1 and −0.46 μm·s−1, which decreased by 39.66% and 36.98%, respectively. Our work not only simultaneously enhances the mechanical properties and ablation resistance of HfC-coated carbon/carbon (C/C) composites but also provides novel prospects for advanced ultrahigh-temperature ceramic nanowires under extreme conditions.

Keywords: mechanical performance, carbon/carbon (C/C) composites, ablation resistance, HfC coating, HfxTa1−xC solid solution nanowires

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Publication history

Received: 12 January 2024
Revised: 18 March 2024
Accepted: 18 March 2024
Published: 21 May 2024
Issue date: May 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

This work was supported by the National Key R&D Program of China (No. 2021YFA0715803), the National Natural Science Foundation of China (Nos. 52293373 and 52130205), the Joint Fund of Henan Province Science and Technology R&D Program (No. 225200810002), and the Fundamental Research Funds of Henan Academy of Sciences (No. 240621040).

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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