WU Lixiang ^{1, 2}, XUE Jiaxiang ^{1, 2} MA Haibin ^{1, 2}, ZHAI Jianhan^{1, 2}, LIU Yang ^{1, 2}, REN Qisen ^{1, 2},
LIAO Yehong ^{1, 2}, GUO Weiming ³, LIN Huatai ³

(1. Nuclear Fuel and Materials Department, China Nuclear Power Technology Research Institute, Shenzhen 518026, Guangdong, China; 2. High-safety Accident Tolerant Fuel Technical Engineering Laboratory, Shenzhen 518116, Guangdong, China; 3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China)

Abstract: SiC ceramics have excellent mechanical properties, high temperature stability and corrosion resistance, thus having great application potentials in the fields of aerospace, marine engineering and nuclear energy. However, due to their intrinsic brittleness and high hardness, it is difficult to obtain SiC ceramic components with large and complex shape by machining. It is, therefore, important to develop low-temperature and low-pressure joining technologies to extend the applications of SiC ceramics. Ti-Si filler was used as interlayer to join the CVD-SiC matrix at the temperatures ranging from 1450 ℃ to 1550 ℃ for pressureless joining. The results revealed that the SiC joint, which was joined at 1500 ℃, had the highest shear strength (23.1±5.7) MPa. Simultaneously, the fracture of the joint occurred both on the interlayer and interface.

Key words: silicon carbide; brazing; microstructure; shear strength