Can quartz glass tube be tempered?
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In theory, quartz glass tube can be tempered. But in practice, there is no tempered quartz glass tuebs. This is because quartz glass tube is very difficult to temper, even if tempered, its effect is very limited. The expansion coefficient of quartz glass tube is very small, only about 5.4*10-7, so it has good quench and heat resistance, even if it is burned to more than 1000 degrees of glass burst. But it will not explode in cold water. Quartz glass tube has a small expansion coefficient, so it is used as a support to measure the expansion coefficient of other glass.
The toughening of glass is closely related to the expansion coefficient of glass. The toughening is to produce strong internal stress by the change of the expansion volume inside and outside the glass during cooling. The strength of glass can be improved by the uniform distribution of internal stress inside the glass. Because the expansion coefficient of quartz glass tube is very small, the ordinary toughening process is used in quartz glass. The internal stress inside the glass is very small, which can not enhance the strength of the glass.
The softening point of quartz glass tube is more than 1700 degrees. It is too difficult to toughen quartz glass tube with higher temperature and faster cooling speed than ordinary tempering process. It is better to find other ways to improve the strength of glass.
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