Effect of TiO₂ Doping on Structure and Properties ofCaO-Al₂O₃-SiO₂ Series Glass

CaO-Al₂O₃-SiO₂ (CAS) series glass with TiO₂ doping amount (mole fraction) of 0-5.0% was prepared by traditional melt cooling method, and the effect of TiO₂ doping amount on the micro structure, thermal stability and bending strength of the glass was studied. The results show that TiO₂ mainly existed in the form ofTiO₅ unit in CAS series glass network. With increasing TiO₂ doping amount, the number ofTiO₅ unit and Ti-O-Si bond in the glass, the number of bridge oxygen in the glass network, and optical band gap of the glass all first increased and then decreased, and all reached the largest value when the TiO₂ doping amount was 4.0%. With increasing TiO₂ doping amount, the thermal stability and flexural strength of CAS series glass first increased and then decreased. When the doping amount of TiO₂ was 4%, the comprehensive performance was the best, and the glass transition temperature, bending strength and optical band gap were 798.24℃, 95.58 MPa and 3.75 eV, respectively.