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Glass melting furnace and cooling Department of the top (including the arch angle), the site is often at 1600 ℃ operating temperature, the use of refractory material in this area is subject to high temperature, load but also by the alkali steam and compound Therefore, the material used for the top must have high refractoriness, high load softening temperature and good creep resistance, and the thermal conductivity is small, the erosion of high temperature does not pollute the glass liquid, the bulk density is small, High temperature strength and other characteristics. The high-quality high-purity silica brick with just the above characteristics: 1, the load temperature close to the refractory; 2, high temperature stability, high strength; 3, due to the main component of SiO2, content> 96%, the same as the main components of glass , So erosion under high temperature basically does not pollute the glass liquid; 4, the price is cheap. Therefore, at present, in the top of large-scale glass, pure high-quality high-purity silica bricks become the glass of choice for manufacturers. The chemical attack caused by high temperature chemical reaction between fly ash, alkali vapor and refractory materials, as well as the change of the crystal form and the change of the structure due to temperature and phase migration are the main reasons for the damage of the top tile. The results show that the high-quality glass kiln silica brick is used in the top of 碹 roof, and the alteration process at high temperature is basically phase transformation and impurity migration. The chemical attack and melting effect are extremely slight. As a result of phase change and self-purification, the working belt gradually changes its performance and its high temperature performance is improved.