Hot-dip treatment also known as homogeneous treatment, commonly known as "detonation." Hot-dip treatment is to heat the tempered glass to 290℃±10℃, and keep the heat for a certain period of time, so that nickel sulfide in the tempered glass to complete the transformation of the crystal, so that the original use of the possibility of self-exploding tempered glass in the factory in advance of the hot-dip furnace, thereby reducing the installation This method generally uses hot air as the medium of heating, which is called "Heat soak Test" abroad, and is referred to as HST.
Hot dip difficulty. In principle, hot dip treatment is neither complicated nor difficult. But it's really not easy to achieve this process. The study shows that the specific chemical structure of nickel sulfide in glass is various, such as NI7S6, NiS, NiS1.01, not only the proportion of various components, but also may be doped with other elements. Its phase change height depends on the temperature. The results show that the phase change rate of 280 ℃ is 100 times times that of 250 ℃, so it is necessary to ensure that the glass in the furnace undergoes the same temperature system. Otherwise, on the one hand, low temperature glass due to insufficient heat preservation time, nickel sulfide can not completely phase change, weakening the effect of hot dip. On the other hand, when the glass temperature is too high, it will even lead to the reverse phase change of nickel sulfide, resulting in greater hidden danger. Both of these conditions can lead to hot-dip treatment vain or even counterproductive. The temperature uniformity of the hot-dip furnace is so important, and most of the domestic hot-dip heat-soaking furnace hot-dip heat-preservation furnace temperature even to 60 ℃, the introduction of foreign stoves in the presence of about 30 ℃ temperature difference is not uncommon. So some tempered glass, although hot-dip treatment, the rate of self detonation is still high.
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