采用传统熔体冷却法制备TiO2掺杂量为0~1.8 wt%的TiO2/SiO2-Al2O3-MgO系玻璃,探讨了不同TiO2质量分数对玻璃体积密度、弯曲强度、压缩强度、压缩模量和结构稳定性的影响规律.结果发现:当TiO2含量小于1.5 wt%时,TiO2/SiO2-Al2O3-MgO系玻璃的光学带隙随着TiO2含量的增加而减小、玻璃结构更加稳定,其体积密度、弯曲强度、压缩强度以及压缩模量均随着TiO2含量的增加而上升;当TiO2含量超过1.5 wt%后,该玻璃体系的结构稳定性和力学性能均随着TiO2含量增加而下降;当TiO2的质量分数为1.5 wt%时,玻璃的光学带隙达到最小值为3.75 eV,各项力学性能达到最优,其弯曲强度为110.36 MPa、压缩强度为240.18 MPa、压缩模量为115.03 GPa.适量TiO2的掺杂,减少了玻璃网络结构中非桥氧的数量,使孤立的岛状网络单元重新聚合,从而显著提高了玻璃的结构稳定性和力学性能;但过量的TiO2迫使TiO2/SiO2-Al2O3-MgO系玻璃结构中的桥氧键断裂生成非桥氧,由此显著降低了其结构稳定性和力学性能.
The Silicate glasses in TiO2/SiO2-Al2O3-MgO system doping with 0-1.8 wt% TiO2 were prepared by the conventional melt quenching technique, and the effects of TiO2 on the density, bending strength, compressive strength, compression modulus and structural stability were investigated.When the content of TiO2 is less than 1.5 wt% (mass fraction), the density, bending strength, compressive strength and compression modulus increase with the increasing of TiO2 content, and the optical band gap decreases with the TiO2 content increasing.As the content of TiO2 is more than 1.5 wt%, the density, bending strength, compressive strength and compression modulus decrease with the increasing of TiO2 content, and the optical band gap increases with the increasing of TiO2 content.When the content of TiO2 is 1.5 wt%, the mechanical properties of the TiO2/SiO2-Al2O3-MgO system is excellent, and the bending strength, compressive strength, compression modulus and optical band gap of the glasses is 110.36 MPa, 240.18 MPa, 115.03 GPa and 3.75 eV, respectively.The addition of TiO2 reduces the numbers of the non-bridging oxygen in the glass network structure, increasing the structural stability of the investigated glasses.So the network structure of the isolated island is rejoined, which significantly improve the mechanical properties of the glass.However, excessive TiO2 force its structure of the bridge oxygen bond to generate non-bridging oxygen, which significantly reduces the structural stability and mechanical properties of the investigated glasses.
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