The self-explosion rate of the domestic and the self-explosion rate is not consistent with the manufacturers, ranging from 3% to 0.3%. Generally, the self-explosion rate is calculated in units of the number of pieces, and the area size and glass thickness of the single piece of glass are not considered, so it is not accurate enough, and no more scientific comparison is possible. In order to uniformly measure the self-explosion rate, a unified assumption must be determined. Uniform conditions are determined: every 5 to 8 tons of glass contains a nickel sulfide sufficient to cause self-explosion; the area of ​​each piece of tempered glass is 1.8 mm on average; nickel sulfide is evenly distributed. Then calculate the self-detonation rate of 6mm thick tempered glass from 0.64% to 0.54%, that is, the self-explosion rate of 6mm tempered glass is about 3‰~5‰. This is basically consistent with the actual value of domestic high-level processing enterprises. Even if it is completely produced according to the standard, it cannot completely avoid the self-explosion of tempered glass. Large buildings can easily use hundreds of tons of glass, which means that the presence of nickel sulfide and heterogeneous impurities in the glass is very high. Therefore, although the tempered glass is subjected to hot dip treatment, self-explosion is still inevitable.

Second, the reason for the uncontrollable self-explosion of tempered glass - nickel sulfide (NiS) and heterogeneous phase particles. The source of uncontrollable self-explosion is not only the traditionally recognized NiS particles, but also many other heterogeneous phase particles. Crack germination and expansion in the glass is mainly due to residual stress generated in the vicinity of the particles. Such stresses can be divided into two categories, one is the phase transition stress in the phase change expansion process, and the other is the residual stress caused by the mismatch of the thermal expansion coefficients. Nickel sulfide (NiS) and heterogeneous phase particles. The inside of the glass contains nickel sulfide impurities, which are present in a small crystal state. Under normal circumstances, the glass will not be damaged. However, since the tempered glass is reheated, the phase state of the nickel sulfide impurities is changed, and the high temperature α state of the nickel sulfide is quenched in the glass. Being frozen, they may take years to recover to the beta state. Since the low-temperature β-state nickel sulfide impurity will increase in volume, local stress concentration will occur inside the glass, and tempered glass will spontaneously occur. However, only relatively large impurities will cause self-explosion, and tempered glass self-explosion will occur only when the impurities are at the core of the tensile stress.

Third, how to identify the self-explosion of tempered glass firstly see if the explosion point (the crack of the tempered glass is radial, all starting points) is in the middle of the glass, such as at the edge of the glass, generally because the glass has not been chamfered or the edge of the glass has Damage, resulting in stress concentration, cracks gradually developed; if the detonation point is in the middle of the glass, look at the burst point whether there are two small pieces of polygons like two butterfly wings like a butterfly pattern, if you look closely at two small pieces The common side of the polygon (the torso part of the butterfly) should have small black particles (nickel sulfide stones) visible to the naked eye, so it can be judged to be self-explosive; otherwise it should be destroyed by external force. A typical feature of glass self-explosion is butterfly spot. The glass fragments are radially distributed, and there are two blocks in the center of the radiation that resemble butterfly wings, commonly known as "butterfly spots." The NiS stone is located at the interface of two "butterfly spots".

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