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<p>To address the core issues of poor wettability by molten metal and the formation of interfacial brittle intermetallic compounds, which lead to low joint strength during brazing of C/C composites, this study employed high-entropy alloys (HEAs) as the filler metal. By precisely controlling the content of active elements, the joint microstructure was regulated to achieve high-performance and high-reliability brazed joints for C/C composites. In this work, the wetting behavior of CoCr<sub>x</sub>FeNi with different Cr content on the C/C matrix was studied, and the C/C composites were successfully brazed using CoCr<sub>x</sub>FeNi HEAs with different Cr content. A correlation between wettability and joint performance was established. With the increase Cr content, the wetting angle of the filler metals on C/C composites decreased significantly, indicating progressively improved wettability. The wetted interfaces and joint structures consisted of M<sub>7</sub>C<sub>3</sub>, FCC and graphite. The CoCrFeNi HEAs produced the brazed joint with the most favorable microstructure and mechanical properties, achieving a shear strength of 40.86 ± 2.54&#xa0;MPa. Fracture predominantly occurred within the C/C composites, indicating failure of the base material, and exhibited a ductile fracture mode.</p>

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Effects of Cr content on the wettability and joint properties of C/C composites brazed with CoCrₓFeNi high-entropy alloys

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Xiaoxuan Gao,
  • Ben Chai,
  • Laifu Wu,
  • Qingchen Song,
  • Li Fu

摘要

To address the core issues of poor wettability by molten metal and the formation of interfacial brittle intermetallic compounds, which lead to low joint strength during brazing of C/C composites, this study employed high-entropy alloys (HEAs) as the filler metal. By precisely controlling the content of active elements, the joint microstructure was regulated to achieve high-performance and high-reliability brazed joints for C/C composites. In this work, the wetting behavior of CoCrxFeNi with different Cr content on the C/C matrix was studied, and the C/C composites were successfully brazed using CoCrxFeNi HEAs with different Cr content. A correlation between wettability and joint performance was established. With the increase Cr content, the wetting angle of the filler metals on C/C composites decreased significantly, indicating progressively improved wettability. The wetted interfaces and joint structures consisted of M7C3, FCC and graphite. The CoCrFeNi HEAs produced the brazed joint with the most favorable microstructure and mechanical properties, achieving a shear strength of 40.86 ± 2.54 MPa. Fracture predominantly occurred within the C/C composites, indicating failure of the base material, and exhibited a ductile fracture mode.