Effect of TiO2 addition amount on BaO-CaO-Al2O3-SiO2 glass-bonded Al2O3 ceramics

A new type of glass-ceramic BaO-CaO-Al2O3-SiO2 (BCAS) was developed to join Al2O3 ceramics, adding TiO2 to the glass-ceramics can promote the crystallization behavior of the glass-ceramics. Through the observation of the joints, rutile TiO2 whiskers can grow on the surface of Al2O3 ceramics, and the grown TiO2 whiskers are onedimensional needle-like whiskers growing in different directions in the joints, providing mechanical support for the joints. The aspect ratio of TiO2 whiskers was changed by controlling the addition of TiO2, and the crystallization behavior and microstructure of the joints were studied. The experimental results show that when the amount of TiO2 added is 10% (wt%), the density of TiO2 whiskers in the joint is the largest, the strengthening effect on the joint is the best, and the shear strength can reach 94.33 MPa.

Automated summary

A new type of glass-ceramic BCAS was developed to join Al2O3 ceramics, and TiO2 was added to promote the crystallization behavior of the glass-ceramics. Rutile TiO2 whiskers were observed to grow on the surface of Al2O3 ceramics in the joints, providing mechanical support. The density of TiO2 whiskers in the joint was found to be the largest when the amount of TiO2 added was 10% (wt%), resulting in the best strengthening effect with a shear strength of 94.33 MPa.