盖板玻璃用高强度化学钢化玻璃的开发

Development of High Strength Chemical Tempered Glass for Cover Glass

化学钢化是通过离子交换形成玻璃的表面压应力。离子交换工艺的简单原理是在400LC左右碱盐溶液中,使玻璃表层中半径较小的离子与溶液中半径较大的离子交换,比如玻璃中的锂离子与溶液中的钠离子交换,玻璃中的钠离子与溶液中的钾离子交换,利用碱离子体积上的差别产生表层压应力。对厚玻璃的增强效果不甚明显,特别适合增2~4mm厚的玻璃。化学钢化玻璃的优点是,其未经转变温度以上的高温过程,所以不会像物理钢化玻璃那样存在翘曲,表面平整度与原片玻璃一样,同时在强度和耐温度变化有一定提高,并可适当作切裁处理。化学钢化的缺点是随时间易产生应力松弛现象,目前已有保护性工艺措施,使化学钢化玻璃具有其他强化玻璃品种不可替代的应用特点。

chemical steelening is the surface compressive stress of glass formed by ion exchange.The simple principle of ion exchange process is that in about 400LC alkaline salt solution,ions with smaller radius in glass surface are exchanged with ions with larger radius in solution.For example,lithium ions in glass and sodium ions in solution,sodium ions in glass and potassium ions in solution exchange,using the difference in the volume of alkali ions to produce surface compressive stress.The enhancement effect on thick glass is not obvious.Specially suitable for increasing glass by 2 to 4 mm thick.The advantage of chemical tempered glass is that it has a high temperature process above the unconverted temperature,so it will not be warped like physical tempered glass,and the surface flatness is the same as that of the original glass.At the same time,the strength and temperature resistance can be improved,and it can be used as a cutting treatment.Thedisadvantage of chemical steelening is that it is prone to stress relaxation over time.At present,protective technological measures have been adopted to make chemical steeled glass have the irreplaceable application characteristics of other strengthened glass varieties.