Li^(+)浓度对化学增强锂铝硅玻璃性能的影响

Effects of Li^(+)Concentration on Chemical Strengthening Properties ofLithium Aluminum Silicon Glass

采用一步法化学增强工艺,研究了熔盐中Li^(+)的富集对不同厚度锂铝硅玻璃表面压应力、应力层深度、弯曲强度、硬度等性能的影响,选择Na_(3)PO_(4)作为熔盐除杂剂并对净化效果进行了评定。研究表明:熔盐中Li^(+)浓度增加至4800×10^(-6),3 mm化学增强锂铝硅玻璃的表面压应力、弯曲强度、硬度下降16.8%、16.8%、10.6%;8 mm化学增强锂铝硅玻璃的表面压应力、弯曲强度、硬度下降17.6%、14.7%、9.8%。熔盐中Li^(+)浓度的变化未对化学增强锂铝硅玻璃应力层深度产生明显影响。Na_(3)PO_(4)具有较好的除杂效果,化学增强锂铝硅玻璃的表面压应力、弯曲强度、硬度得到了明显的恢复,为保证化学增强锂铝硅玻璃在可见光波段具有较高的透光率,除杂剂Na_(3)PO_(4)的掺量不宜超过1%(质量分数)。

One-step ion-exchange process was developed to research chemical strengthened lithium aluminum silicon glass with different thicknesses.Effects of Li^(+)concentration in molten salt on surface compressive stress,depth of layer,flexural strength and hardness of chemical strengthened lithium aluminum silicon glass were investigated,while Na_(3)PO_(4) was selected as the impurity removal agent of molten salt and the purification effect of Na_(3)PO_(4) was evaluated.The results demonstrate that the surface compressive stress,flexural strength and hardness of 3 mm chemical strengthened lithium aluminum silicon glass decrease by 16.8%,16.8%,10.6%when the Li^(+)concentration in molten salt increases,while the surface compressive stress,flexural strength and hardness of 8 mm chemical strengthened lithium aluminum silicon glass decrease by 17.6%,14.7%,9.8%.Li^(+)concentration in molten salt has not obviously effects on the depth of layer and visible light transmittance.Na_(3)PO_(4),as the impurity removal agent of molten salt,has a good impurity removal effect.The surface compressive stress,flexural strength and hardness of chemical strengthened lithium aluminum silicon glass have been significantly restored.In order to ensure that the chemical strengthened glass has a high visible light transmittance,the content of Na_(3)PO_(4) should not exceed 1wt%.