[China Glass Net] After the glass is broken, the starting point of the fracture shows a typical "butterfly spot" shape, as shown in the above figure. It can be clearly seen from the thickness direction that there is a stone in the middle of the thickness direction, and it can be concluded that the fracture of the glass is caused by the "self-explosion phenomenon" of the tempered glass, and is not caused by external force damage.
The tempered glass self-explosion is a phenomenon in which the tempered glass is broken due to the presence of some stones inside the original piece of tempered glass. At the self-explosion starting point of the tempered glass, there will be nickel sulfide stones, which will "freeze" the high-temperature crystalline state (α-NiS) and retain it to normal temperature during the production of tempered glass. Since this high-temperature crystalline state is unstable under normal temperature conditions, it will gradually change to a normal temperature crystalline state (β-NiS) with time, and will be accompanied by a certain volume expansion at the same time as the transformation; if the stone happens to exist in the tempered glass The tensile stress zone (the middle of the thickness of the glass plate), this phase change process often leads to the sudden breakage of the tempered glass, which is what we usually call the "self-explosion" phenomenon of tempered glass. Under normal circumstances, due to the original glass, the tempered glass has a certain self-explosion rate. From the technical point of view, the self-explosion rate of the tempered glass can be greatly reduced by controlling the quality of the original glass or performing the secondary heat treatment, but the tempered glass cannot be completely eliminated. Self-destruction. Under normal circumstances, when the tempered glass is broken by external force, such as pebbles, etc., at the tipping point of the glass, the "butterfly spot" will find that the surface of the glass is not smooth, there are some glass powder and small pits. Because the glass is caused by the energy brought by the external force. The self-explosive tempered glass has a smooth inner and outer surface at the tipping point.
Gowns For Womens,Long Sleeve Maxi Dress,Party Wear Dress,Plus Size Formal Dresses
SHAOXING RUIZI IMPORT&EXPORT CO.,LTD , https://www.ruizigarment.com