Abstract
In this study, Al2O3 ceramics were joined using a novel BaO-CaO-Al2O3-SiO2 (BCAS) glass brazing medium to which 10 % TiO2 powder was added. The reaction of microstructure, structure and interface of the joints were investigated at different temperatures, and the growth process and microstructure evolution mechanism of TiO2 whiskers were revealed by controlling the temperature. The results show that the TiO2 whiskers grow from the nucleation of the Al2O3 ceramic surface to form one-dimensional needle-like whiskers and grow in different directions toward the glass. Due to the combined effect of the reaction between the Al2O3 ceramic and the BCAS, and the mechanical support of the TiO2 whiskers in the weld, the Al2O3 ceramic can form a reliable joint. Experiments have shown that the joints bonded with BCAS with 10 % TiO2 powder at 1300 °C for 30 min exhibited the best mechanical properties and the shear force could reach up to 93.37 MPa.
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