Low temperature and high temperature have different effects on the strength of glass. It is generally believed that as the temperature increases, more strain energy will accumulate at the defects, increasing the probability of rupture. When the temperature is higher than ℃, the viscous flow of the glass increases, which blunts the cracks of the microcracks and relaxes the stress, thereby increasing the strength of the glass. The use temperature range of glass is wide, and the mechanism of temperature's influence on glass strength has not yet been explored. According to tests in the range of absolute zero (℃) to ℃, the lowest point of strength is around ℃.
Here we also need to talk about the thermal stability of glass, that is, the maximum temperature difference that the glass can withstand without being damaged, that is, the temperature difference that the glass can withstand rapid cooling and rapid heating. The smaller the significant expansion coefficient, the better its thermal stability. The temperature of the glass is about ℃. In other words, when the glass is heated to ℃, it will break if it drops to ℃ instantaneously. Crystallized glass has high thermal stability because of its high expansion coefficient. Usually, when it is heated rapidly, compressive stress is generated on the glass surface and it is not easy to be damaged, but when it is cooled rapidly, tensile stress is generated on the glass surface and it is easy to be damaged. The thermal stability of glass is also related to the glass composition, product thickness, whether it has been quenched, etc. Hama Flower
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