氧化锆对锂铝硅酸盐玻璃化学强化性能的影响

Effect of Zirconia on Mechanical Properties of Chemically Strengthened Lithium Aluminosilicate Glasses

采用熔融淬冷法制备了含不同摩尔分数ZrO_(2)的锂铝硅酸盐玻璃,通过两步化学强化法对玻璃样片进行了化学强化,研究了ZrO_(2)对玻璃的稳定性、硬度和化学强化效果的影响。结果表明:随着ZrO_(2)的摩尔分数从0增加至5%,玻璃化转变温度随之升高,玻璃稳定无析晶现象。引入适量的ZrO_(2)会促进Li^(+)-Na^(+)离子交换,提高应力层深度,表面压应力随着ZrO_(2)浓度的增加而增加,并在摩尔分数为4%时达到最大值,为1055.6 MPa。中心张应力随着ZrO_(2)浓度的增加先增加后缓慢减小,表明该系列样品具有较好的抗冲击能力。ZrO_(2)的浓度变化对强化后玻璃的硬度影响较小,在引入ZrO_(2)后其抗裂性有所降低,但仍具有较好的抗裂能力。

Lithium-aluminosilicate glasses with different zirconia(ZrO_(2))concentrations were prepared by a melting-quenching method.Glass slices were treated using a two-step chemical strengthening method below glass transition temperature(T_(2)).The effect of ZrO_(2)addition on the glass stability,hardness and chemical strengthening performance was investigated.The results show that the T;increases with the increase of ZrO_(2)concentration in the range of 0–5%(in mole fraction).The absence of crystallization peaks indicates these glasses are rather stable.An appropriate addition of ZrO_(2)can promote the Li;-Na;ions exchange and increase the layer depth.The surface compression stress(σ_(c))increases with the increase of the ZrO_(2)concentration and reaches a maximum value of 1055.6 MPa at 4%Zr O_(2)concentration.The center tension firstly increases and then decreases slightly with the increase of the ZrO_(2)concentration,indicating that these glass samples have a good shock resistance.The addition of ZrO_(2)has little effect on the hardness of glasses after chemical strengthening.Although the addition of ZrO_(2)decreases the crack resistance,these glasses still have a good crack resistance performance after chemical strengthening.