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玻璃的熱穩定性怎么測定?


發布時間:2018-05-21    來源:杭州晶冠玻璃瓶有限公司    瀏覽次數:1122次

   測定玻璃熱穩定性能的基本方法是急冷法,其方法可分為玻棒法和成品法。玻棒法是取一定數量的棒狀玻璃試樣,經在特別的電爐中加熱,然后使之急速冷卻。這種方法具有規范化,測試結果可以相互比較,對科學研究、新產品開發來說具有不少優點。而成品法是直接以玻璃制品作為試樣,其優點是能夠反映產品的實際性能,但對不同組成、不同品種,&至相同組成、不同品種的玻璃來說,其測試結果不能相互比較。因此在測定玻璃熱穩定性時,要根據測試對象選擇其測試方法。14.1.2.1玻璃材質熱穩定性的測定(玻棒法)(1)方法原理玻璃在經受急冷急熱時,由于溫度差而膨脹收縮不同,當急熱時,玻璃便產生壓應力,急冷時,其表面產生張應力。通常玻璃的耐壓強度要比拉伸強度大得多,因此當張應力值超過玻璃本身的抗張能力時,玻璃就會發生破裂現象。根據此原理,取一定數量的棒狀玻璃試樣,在特制的電爐內對其進行加熱,然后進行急劇冷卻。在試樣不破裂的條件下,用玻璃所能承受的最大溫度差值(多次試驗的平均溫度差值)來表示玻璃的穩定性。

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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