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
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.
2026, 
