Microstructure and mechanical properties of C/C composite joint brazed with Ni-based filler
(1. Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China;
2. Shanghai Engineering Technology Research Center of Near-net Shape Forming for Metallic Materials, Shanghai 201600, China;
3. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China)
2. Shanghai Engineering Technology Research Center of Near-net Shape Forming for Metallic Materials, Shanghai 201600, China;
3. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China)
Abstract: The novel Ni-based brazing filler was used to join C/C composites. When brazing temperature increased from 1080 to 1100 °C, the wetting angle decreased from 23° to 14°, and the brazing filler had good wettability on the surface of C/C composites. The brazing seam of the brazed joint consisted of Ni(s,s) and Cr3C2 phases. As brazing temperature increased, lots of Cr3C2 phases were generated at the bonding interface, and the thick reaction layer was formed. When brazing temperature was 1120 °C, the shear strength of C/C joint reached the maximum value of 31.5 MPa. The fracture path extended in the C/C matrix close to the bonding interface.
Key words: brazing; microstructure; shear strength; C/C composites