Z. Li, H. Cui, J. Feng, Harbin Institute of Technology, Harbin, China
Abstract: SiC ceramic was brazed with Ti-Zr-Ni-Cu amorphous braze alloy foil in a vacuum furnace. The Interface structure and mechanical properties of the joints were investigated. The interface structure is SiC/TiC/(Ti,Zr)2(Ni,Cu)+(Ti,Zr)+(Ti,Zr)(Ni,Cu)+Ti5Si3+Zr2Si/TiC/SiC. With increased brazing temperature or time, the (Ti,Zr)2(Ni,Cu) disappears and a new layer of TiC appears in the joint. The three-point bend strength is 69MPa for the joint brazed at 960°C for 10 min. The fracture takes place at the interface of TiC and SiC or Ti5Si3+Zr2Si.
Key words vacuum brazing; SiC ceramic; Interface; microstructure; strength
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