TiO_(2)掺杂对CaO-Al_(2)O_(3)-SiO_(2)系玻璃结构和性能的影响

Effect of TiO_(2) Doping on Structure and Properties of CaO-Al_(2)O_(3)-SiO_(2) Series Glass

采用传统熔体冷却法制备TiO2掺杂量(物质的量分数)为0~5.0%的CaO-Al_(2)O_(3)-SiO_(2)(CAS)系玻璃,研究了TiO_(2)掺杂量对该玻璃微观结构、热稳定性、弯曲强度的影响规律。结果表明:TiO_(2)在CAS系玻璃网络中主要以[TiO_(5)]单元的形式存在,随着TiO_(2)掺杂量的增加,玻璃中的[TiO_(5)]单元和Ti-O-Si键数量先增加后降低,玻璃网络中的桥氧数量先增多后减少,玻璃的光学带隙先增大后减小,且均在TiO2掺杂量为4.0%时达到最大值;随着TiO_(2)掺杂量的增加,CAS系玻璃的热稳定性和弯曲强度均先提高后降低,当TiO_(2)掺杂量为4%时综合性能最好,此时玻璃化转变温度、弯曲强度和光学带隙分别为798.24℃,95.58 MPa,3.75 eV。

CaO-Al_(2)O_(3)-SiO_(2)(CAS)series glass with TiO_(2) 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 TiO_(2) mainly existed in the form of[TiO_(5)]unit in CAS series glass network.With increasing TiO_(2) doping amount,the number of[TiO_(5)]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 TiO_(2) 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 TiO_(2) 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.