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Research Article | Open Access

Fabrication and mechanical behavior of 2D-Cf/TaxHf1−xC–SiC composites by a low-temperature and highly-efficient route

Xuegang Zoua,b,cDewei Nia,b,d( )Bowen Chena,bFeiyan Caia,b,cLe Gaoa,bPing Hea,bYusheng Dinga,bXiangyu Zhanga,bShaoming Donga,b( )
State Key Laboratory of High-Performance Ceramics & Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
University of Chinese Academy of Sciences, Beijing 100049, China
Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
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Abstract

Cf/TaxHf1−xC–SiC composites are ideal thermal structural materials for service under extreme conditions of hypersonic vehicles. However, how to synthesize TaxHf1-xC powders and efficiently fabricate Cf/TaxHf1-xC–SiC composites still faces some challenges. Furthermore, mechanical properties and thermophysical properties of TaxHf1−xC vary with the composition, but not monotonically. In-depth analysis of mechanical behaviors of the Cf/TaxHf1−xC–SiC composites is extremely important for their development and applications. In this study, the TaxHf1−xC powders (x = 0.2, 0.5, 0.8) were successfully synthesized via solid solution of TaC and HfC at a relatively low temperature of 1800 ℃, with a small amount of Si as an additive. Subsequently, the efficient fabrication of 2D-Cf/TaxHf1–xC–SiC composites was achieved by slurry impregnation and lamination (SIL) combined with precursor infiltration and pyrolysis (PIP). In addition, the mechanical behavior of the composites was investigated systematically. It is demonstrated that the composites present remarkable non-brittle fractures, including a large number of fiber pull out and interphase debonding. Also, the fracture failure involves a complex process of microcrack generation and propagation, matrix cracking, and layer fracture. Moreover, the interfacial bonding between the fibers and the matrix is enhanced as the Ta∶Hf ratio decreases from 4∶1 to 1∶4. As a result, Cf/Ta0.2Hf0.8C–SiC composites exhibit exceptional flexural strength of 437±19 MPa, improved by 46% compared with Cf/Ta0.8Hf0.2C–SiC (299±19 MPa). This study provides a new perception of design and fabrication of ultra-high-temperature ceramic (UHTC) matrix composites with high performance.

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Journal of Advanced Ceramics
Pages 1961-1972
Cite this article:
Zou X, Ni D, Chen B, et al. Fabrication and mechanical behavior of 2D-Cf/TaxHf1−xC–SiC composites by a low-temperature and highly-efficient route. Journal of Advanced Ceramics, 2023, 12(10): 1961-1972. https://doi.org/10.26599/JAC.2023.9220800

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Received: 22 June 2023
Revised: 29 July 2023
Accepted: 29 August 2023
Published: 19 October 2023
© The Author(s) 2023.

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