Abstract
Q235 steel /Al2O3 ceramics were brazed with Ag-CuO filler metal at 1050°C and held for 15min in air. When brazing Q235 steel and Al2O3 ceramics directly, it was found that serious oxidation occurred on the steel side during the brazing process. Although the joining was realized, a loose oxide film was formed on the surface of the base steel, which affected the mechanical properties of joints. When Q235 steel with aluminized surface was adopted to braze with Al2O3 ceramics, a Al2O3 layer formed on the surface of Q235 steel successfully avoided the oxidation of Q235 steel, and a compact and defection-free joint was obtained. The typical organization of joint was Al2O3/ CuAl2O4/ CuO/ Ag/ CuO/ CuAl2O4 /Al2O3/ FeAl/ FeAl2/ Fe.
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