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<p>The precise integrated assembly of SiC<sub>f</sub>-SiC composite and a Ni-based superalloy (K403) has important applications in advanced aircraft engines and nuclear reactors. It was realized by an innovative method characterized by surface coating pretreatment on the SiC<sub>f</sub>-SiC and subsequent integral precision casting with K403 superalloy melt. Two types of reactive coatings on the SiC<sub>f</sub>-SiC were created by the pretreatments of 4Ni-6Ti alloy powder and (4Ni-6Ti)–4.5C (atomic ratio) mixed powder at 1210 °C, in which the Ti preferentially reacted with the C and then with the SiC<sub>f</sub>-SiC to form TiC particles; and as the activity of the Ti became insufficient, the Ni reacted with the SiC<sub>f</sub>-SiC. And the (4Ni-6Ti)–4.5C coating had less shrinkage and better bonding with the SiC<sub>f</sub>-SiC. The application of the coating successfully solved the problem of easy cracking in an integrated cast of SiC<sub>f</sub>-SiC/K403, and achieved complete integrated casts with robust bonding interfaces of average shear strength of 72.9&#xa0;MPa. Our studies reveal that the coating prevents intense interfacial reactions between the Ni element in the melt and the SiC<sub>f</sub>-SiC as well as direct thermal shock of the melt on the SiC<sub>f</sub>-SiC during the casting. Meanwhile, the interlayer with uniformly distributed TiC particles evolved from the coating remarkably decreases the interfacial thermal stress by reducing both mismatches of thermal expansion coefficients and temperatures. A formula for estimating the interfacial thermal stress of an integrated cast has also been derived.</p>

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Investigation on the (Ni-Ti)-C Pretreated SiCf-SiC Composite and Its Integrated Cast with Ni-Based Superalloy Melt

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Guobiao Lin,
  • Jingyu Liu,
  • Fuhu Zhu,
  • Jiafa Wang,
  • Zhipeng Zhang

摘要

The precise integrated assembly of SiCf-SiC composite and a Ni-based superalloy (K403) has important applications in advanced aircraft engines and nuclear reactors. It was realized by an innovative method characterized by surface coating pretreatment on the SiCf-SiC and subsequent integral precision casting with K403 superalloy melt. Two types of reactive coatings on the SiCf-SiC were created by the pretreatments of 4Ni-6Ti alloy powder and (4Ni-6Ti)–4.5C (atomic ratio) mixed powder at 1210 °C, in which the Ti preferentially reacted with the C and then with the SiCf-SiC to form TiC particles; and as the activity of the Ti became insufficient, the Ni reacted with the SiCf-SiC. And the (4Ni-6Ti)–4.5C coating had less shrinkage and better bonding with the SiCf-SiC. The application of the coating successfully solved the problem of easy cracking in an integrated cast of SiCf-SiC/K403, and achieved complete integrated casts with robust bonding interfaces of average shear strength of 72.9 MPa. Our studies reveal that the coating prevents intense interfacial reactions between the Ni element in the melt and the SiCf-SiC as well as direct thermal shock of the melt on the SiCf-SiC during the casting. Meanwhile, the interlayer with uniformly distributed TiC particles evolved from the coating remarkably decreases the interfacial thermal stress by reducing both mismatches of thermal expansion coefficients and temperatures. A formula for estimating the interfacial thermal stress of an integrated cast has also been derived.