Glasses containing monovalent species can be chemically strengthened by the replacement of smaller ions in the glass with larger external ions in the near glass surface. This type of ion exchange puts glass surface under high compressive stress (CS). Glass mainly fails from tension with the presence of surface flaws. Chemical strengthening can change the stress at the flaw tip from tension to compression and further stop the flaw from propagating. Glass damage resistance is therefore significantly improved. For the same glass composition, glass thermal histories can affect the magnitude and depth of the CS generated during ion exchange. In this study, the impact of thermal history on glass physical properties and ion exchange attributes in one alkali‐containing glass formed by fusion draw process was investigated. Multiple thermal treatments were done to rewrite the glass thermal histories. Glass density, refractive index, and ion‐exchange properties as a function of the thermal treatment were studied. It is concluded that ion exchange‐related properties change dramatically with the glass thermal history.

中文翻译：

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热历史及其影响：离子交换的案例研究

可以通过在玻璃表面附近用较大的外部离子替换玻璃中的较小离子来化学增强包含一价物种的玻璃。这种类型的离子交换将玻璃表面置于高压缩应力（CS）下。玻璃由于存在表面缺陷而主要由于张力而失效。化学强化可以将缺陷尖端处的应力从拉伸改变为压缩，并进一步阻止缺陷扩散。因此，抗玻璃损伤性显着提高。对于相同的玻璃成分，玻璃的热历史会影响离子交换过程中产生的CS的大小和深度。在这项研究中，研究了热历史对通过熔融拉伸工艺形成的一种含碱玻璃中玻璃物理性质和离子交换属性的影响。进行了多次热处理以重写玻璃的热历史。研究了玻璃密度，折射率和离子交换性能与热处理的关系。可以得出结论，与离子交换相关的特性会随着玻璃的热历史而发生巨大变化。