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| Interfacial Microstructure and Mechanical Properties of CMC/Superalloy Joints Brazed With Ni-Based High-Entropy Filler |
| CHEN Xiukai1, 2, 3, TAO Jun1, BIAN Hong2, 3, SONG Xiaoguo2, 3, HOU Jinbao1, LÜ Yanlong1 |
1. Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute, Beijing 100024, China;
2. State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China;
3. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology (Weihai), Weihai 264209，China |
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Abstract A Ni-based high-entropy filler was developed for the joining of SiCf /SiC ceramic-matrix composites and superalloy hot-end components in aero-engines, and the effect of brazing temperature on the interface microstructure and mechanical properties of SiCf /SiC–GH4950 superalloy joints was studied. The results indicate that the typical interfacial microstructure of the SiCf /SiC – GH4950 joint is SiCf /SiC/(Ni, Co)2 Si + graphite/Cr3C2 + (Ti, W,Cr)C1–x /Co – Cr – Ni – W – Si–Ti + (Ni, Co)3 (Al, Si) + (Ni, Co)3 (Si, Ti)/GH4950. Under the condition of holding at 1220 ℃ for 10 min, the room temperature strength and high-temperature strength at 1000 ℃ of the SiCf /SiC– GH4950 joint were 158 MPa and 66.3 MPa, respectively. The SiCf /SiC– GH4950 joint mainly fractured along the weak zone of (Ni, Co)2 Si+graphite.
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| PACS: V25；TG454 |
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2026, 
