What is tempered glass hot dip?

What is the probability principle of hot dip to reduce the tempered glass blew?

Hot-dip treatment, also known as homogeneous treatment, commonly known as "detonated." Hot-dip treatment is the tempered glass heated to 290 ℃ ± 10 ℃, and insulation for a certain time, to promote the nickel sulfide in the tempered glass in the rapid completion of the crystal phase transformation, so that after the original use of polished glass can be artificially broken in advance of the factory Hot-dip furnace, thereby reducing the use of tempered glass after installation. The method is generally used hot air as a heating medium, foreign called "Heat Soak Test", referred to as HST, literal translation for the hot dip treatment.

Hot dip difficult. From the principle point of view, hot dip treatment is neither complicated nor difficult. But in fact to achieve this process is very difficult. Studies have shown that the specific chemical structure of nickel sulfide in glass, such as Ni7S6, NiS, NiS1.01, etc., not only the proportion of various components, and may be doped with other elements. The phase change is highly dependent on the temperature level. Studies have shown that the rate of phase change at 280 ° C is 100 times that at 250 ° C, so it is necessary to ensure that the glass in the furnace experiences the same temperature regime. Otherwise the low temperature of the glass on the one hand due to insufficient insulation time, nickel sulfide can not completely phase change, weakening the effectiveness of hot-dip. On the other hand, when the glass temperature is too high, or even lead to reverse phase transition of nickel sulfide, or stress is too high lead to excessive reduction in steel stress, causing greater hidden dangers. Both of these conditions can lead to hot dip treatment and reactive and even counterproductive.

With the relevant foreign statistics in the strict sense of the hot dip, can be reduced to the tempered glass blew probability can be reduced to 400 tons of glass per case, that blew probability can be reduced by 2 orders of magnitude. Because the strict sense can not be absolutely ruled out the steel blew, whether the glass is hot can not be detected; the same time hot-dip process time-consuming, labor, equipment and process requirements are higher, so many domestic non-standard production enterprises, often false Baptist or incomplete hot dip also affects the acceptance of hot-dip processes in the country.