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In this paper, a high-yield Hf-modified SiHfBOC ceramic precursor was developed, and a high-pressure assisted impregnation pyrolysis method was proposed to achieve the preparation of 3D PyC–Cf/SiHfBOC composites. This high-pressure assisted impregnation method significantly improves impregnation filling effect of the precursor in and between fiber bundles compared to dozens of traditional impregnation cycles. After undergoing just 9 precursor infiltration pyrolysis (PIP) cycles, the composites achieved relative density of approximately 90% and density of 1.64 g/cm3. The critical temperature difference of the 3D PyC–Cf/SiHfBOC composites after the shock of room temperature (RT)–1000 ℃ is as high as 650 ℃, which is twice that of traditional ceramic materials, showing good thermal shock resistance. Under the effect of Hf modification, a dense HfO2–SiO2 oxide layer (thickness of 93 μm) was formed in situ on the surface of the 3D PyC–Cf/SiHfBOC composites, effectively preventing further erosion of the composite matrix by high-temperature oxidation gas. Even in the ultra-high-temperature oxygen-containing environment at 1800 ℃, it still exhibits an excellent non-ablative result (with a linear ablation rate of 0.83×10−4 mm/s). This work not only enriches the basic research on lightweight ultra-high-temperature ceramic composites converted from Hf ceramic precursors, but also provides strong technical support for their applications in ultra-high-temperature non-ablative thermal protection materials for high-speed aircraft.


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Efficient fabrication of light Cf/SiHfBOC composites with excellent thermal shock resistance and ultra-high-temperature ablation up to 1800 °C

Show Author's information Yang LyuaZhihong HanaGuangdong ZhaobYuan Chenga( )Shanbao ZhouaXinghong ZhangaGuiqing ChenaWenbo Hana( )
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, and Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China
School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China

Abstract

In this paper, a high-yield Hf-modified SiHfBOC ceramic precursor was developed, and a high-pressure assisted impregnation pyrolysis method was proposed to achieve the preparation of 3D PyC–Cf/SiHfBOC composites. This high-pressure assisted impregnation method significantly improves impregnation filling effect of the precursor in and between fiber bundles compared to dozens of traditional impregnation cycles. After undergoing just 9 precursor infiltration pyrolysis (PIP) cycles, the composites achieved relative density of approximately 90% and density of 1.64 g/cm3. The critical temperature difference of the 3D PyC–Cf/SiHfBOC composites after the shock of room temperature (RT)–1000 ℃ is as high as 650 ℃, which is twice that of traditional ceramic materials, showing good thermal shock resistance. Under the effect of Hf modification, a dense HfO2–SiO2 oxide layer (thickness of 93 μm) was formed in situ on the surface of the 3D PyC–Cf/SiHfBOC composites, effectively preventing further erosion of the composite matrix by high-temperature oxidation gas. Even in the ultra-high-temperature oxygen-containing environment at 1800 ℃, it still exhibits an excellent non-ablative result (with a linear ablation rate of 0.83×10−4 mm/s). This work not only enriches the basic research on lightweight ultra-high-temperature ceramic composites converted from Hf ceramic precursors, but also provides strong technical support for their applications in ultra-high-temperature non-ablative thermal protection materials for high-speed aircraft.

Keywords: thermal shock resistance, precursor infiltration pyrolysis (PIP) method, ablation resistance, ablation mechanism, 3D PyC–Cf/SiHfBOC composites

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Publication history
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Publication history

Received: 29 July 2023
Revised: 01 September 2023
Accepted: 20 September 2023
Published: 24 November 2023
Issue date: November 2023

Copyright

© The Author(s) 2023.

Acknowledgements

This work is supported by the Key Program of the National Natural Science Foundation of China (No. 52032003), National Natural Science Foundation of China (Nos. 51972082, 52102093, and 52172041), Postdoctoral Research Foundation of China (No. 2021M690817), and the Science Foundation of National Key Laboratory of Science and Technology on Advanced Composites in Special Environments.

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