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玻璃的热稳定性怎么测定?


发布时间:2018-05-21    来源:杭州晶冠玻璃瓶有限公司    浏览次数:737次

   测定玻璃热稳定性能的基本方法是急冷法,其方法可分为玻棒法和成品法。玻棒法是取一定数量的棒状玻璃试样,经在特别的电炉中加热,然后使之急速冷却。这种方法具有规范化,测试结果可以相互比较,对科学研究、新产品开发来说具有不少优点。而成品法是直接以玻璃制品作为试样,其优点是能够反映产品的实际性能,但对不同组成、不同品种,&至相同组成、不同品种的玻璃来说,其测试结果不能相互比较。因此在测定玻璃热稳定性时,要根据测试对象选择其测试方法。14.1.2.1玻璃材质热稳定性的测定(玻棒法)(1)方法原理玻璃在经受急冷急热时,由于温度差而膨胀收缩不同,当急热时,玻璃便产生压应力,急冷时,其表面产生张应力。通常玻璃的耐压强度要比拉伸强度大得多,因此当张应力值超过玻璃本身的抗张能力时,玻璃就会发生破裂现象。根据此原理,取一定数量的棒状玻璃试样,在特制的电炉内对其进行加热,然后进行急剧冷却。在试样不破裂的条件下,用玻璃所能承受的最大温度差值(多次试验的平均温度差值)来表示玻璃的稳定性。

The basic method for determining the thermal stability of glass is the quench method, which can be divided into glass rod method and finished product method. The glass rod method takes a certain number of rod glass samples, which are heated in a special electric furnace and then cooled rapidly. This method is standardized, and the test results can be compared with each other, which has many advantages for scientific research and new product development. The finished product method uses glass products directly as the sample, its advantage is that it can reflect the actual performance of the product, but the test results can not be compared to the different composition and variety, to the same composition and different varieties of glass. Therefore, the test method should be chosen according to the test object when determining the thermal stability of glass. 14.1.2.1 glass material thermal stability (1) method (glassy bar method) (glass rod method) (1) principle glass in a sudden cold and rapid heat, due to the temperature difference and expansion and contraction of different, when hot heat, glass produces pressure stress, when cold, the surface of the Zhang Yingli. Generally, the compressive strength of glass is much larger than that of tensile strength. Therefore, when the tensile stress exceeds the tensile capacity of glass itself, the glass will break down. According to this principle, a certain number of rod like glass samples were taken, heated in a special electric furnace, and then cooled rapidly. When the specimen is not cracked, the maximum temperature difference (the average temperature difference of many tests) can be expressed by glass to indicate the stability of glass.



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