[China Glass Net] Tempered glass is also called tempered glass. It uses a physical or chemical method to form a compressive stress layer on the surface of the glass. The glass itself has a high compressive strength and does not cause damage. When the glass is subjected to an external force, the pressure layer can offset part of the tensile stress to avoid the chipping of the glass. Although the inside of the tempered glass is in a state of large tensile stress, the interior of the glass has no defects and does not cause damage. In order to achieve the purpose of increasing the strength of the glass. It is a secondary processing product of flat glass, and the processing of tempered glass can be divided into physical tempering method and chemical tempering method.
Physical tempered glass is also known as hardened tempered glass. When the ordinary flat glass is heated in the heating furnace to near the softening temperature (600 ° C) of the glass, the internal stress is removed by its own deformation, and then the glass is removed from the heating furnace, and the high pressure cold air is blown to the glass by the multi-head nozzle. The tempered glass can be obtained by rapidly and uniformly cooling the two sides to room temperature. This kind of glass is under tension and externally stressed. Once local damage occurs, stress is released and the glass is broken into numerous small pieces. These small pieces have no sharp edges and are not easy to injure people.
Chemically tempered glass increases the strength of the glass by changing the chemical composition of the surface of the glass, and is generally tempered by ion exchange. The method comprises the steps of: immersing a silicate glass containing an alkali metal ion in a molten lithium (Li+) salt, exchanging Na+ or K+ ions of the glass surface layer with Li+ ions, and forming a Li+ ion exchange layer on the surface, due to Li+ The expansion coefficient is smaller than that of Na+ and K+ ions, so that the outer layer shrinks less and the inner layer shrinks more during the cooling process. When cooled to normal temperature, the glass is also in the inner layer and the outer layer is under pressure. Similar to physical tempered glass.
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