[China Glass Network] Every summer, many regions of the country will enter the "barbecue mode." Of course, Shenzhen's annual barbecue mode, there are also many news reports that the cracking of tempered glass in the high-rise building walls of the city often occurs. So is it really like the glass mentioned in the news is being bombarded by a high temperature barbecue? Let us take a look at the reasons for the self-explosion of tempered glass.
In fact, since the birth of tempered glass, it is accompanied by the problem of self-explosion. The self-explosion of tempered glass can be expressed as the phenomenon that the tempered glass automatically breaks without external direct action. Tempered glass blast can occur in the process of tempering processing, storage, transportation, installation and use.
There are three reasons for the common glass breakage: one is self-explosion caused by visible defects in the glass, such as stones, sand, bubbles, inclusions, notches, scratches, blasts, etc.; the second is more common and the probability of occurrence is greater. One is that the tempered glass is self-exploded by nickel sulfide (NIS) impurities and heterogeneous phase particles in the glass. Since the tempered glass is made by ordinary glass high temperature quenching treatment, in this process, the volume of the nickel sulfide is first heated. After shrinking, and then cooling and expanding, this causes a large stress inside the tempered glass, which causes the tempered glass to self-explosion. Such tempered glass usually blew spontaneously shortly after being made, but in rare cases, when nickel sulphide When it is just in the middle of the tempered glass, the self-explosion will be delayed, and the longer it can be delayed until a few years later. The third is caused by external forces. Then, in our real work, such as distinguishing whether the glass is self-destructive or external force leads to fragmentation? In the "magnified view", the outline circled in red, because it resembles a butterfly wing, is called a butterfly spot, which is one of the typical features of self-explosion. As shown in the "enlarged view", if a black spot-like impurity (nickel sulfide) can be found in the small circle, it can be determined that it is self-destructing.
If it is a rupture caused by human factors, basically as shown in the lower right figure, there is a point of impact at the center of the rupture.
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