Tempered glass is the secondary processing of flat glass products, tempered glass processing can be divided into physical steel and chemical steel method.
Physical tempered glass, also known as hardened tempered glass. It will be ordinary flat glass heated in the heating furnace close to the softening temperature of the glass (600 ℃), through its own deformation to eliminate the internal stress, and then remove the glass from the furnace, and then the long nozzle to high-pressure cold air blowing glass Both sides, so that it quickly and evenly cooled to room temperature, you can produce tempered glass. The glass is in the internal tension, the external stress state of stress, once the local damage occurs, there will be stress release, the glass was broken into numerous pieces, these small pieces without sharp edges and corners, not easy to hurt.
Chemical tempered glass is by changing the chemical composition of the glass surface to improve the strength of the glass, the general application of ion exchange method for steel. The Li + ion exchange layer is formed on the surface by Li + ion exchange layer, and the Li + ion exchange layer is formed on the surface of the Li + ion exchange layer by adding the Na + or K + ions of the glass surface layer to the Li + ions in the lithium (Li +) salt in the molten state, The expansion coefficient is less than Na +, K + ions, which in the cooling process caused by the outer shrinkage of small inner shrinkage larger, when cooled to room temperature, the glass will be in the inner layer of tension, the outer pressure state, its effect Similar to physical tempered glass.
Tensile glass strength is high, the compressive strength of up to 125MPa or more, 4 to 5 times higher than ordinary glass; impact strength is also high, with the ball method, 0.8kg steel ball from 1.2m height drop, glass Keep intact.
Tempered glass is much more flexible than ordinary glass, a 1200mm × 350mm × 6mm tempered glass, the force can be up to 100mm bending deflection, when the external force is removed, can still restore the status quo, and ordinary glass bending deformation only A few millimeters.
Thermal stability is good, in the cold by hot, less prone to burst is another feature of tempered glass. This is because the compressive stress of the tempered glass can offset some of the tensile stress generated by rapid cooling and so on. Tempered glass heat shock, the maximum safe operating temperature of 288 ℃, can withstand 204 ℃ temperature difference.
As the tempered glass has good mechanical properties and thermal stability, so in the construction, transportation and other fields have been widely used. Flat glass is often used as a building doors and windows, partitions, curtain walls and windows, furniture, etc., curved glass commonly used in cars, trains and aircraft and so on.
Use should be noted that the tempered glass can not be cut, grinding, corner can not hit the extrusion, according to the size of the existing specifications or proposed specific design drawings into the custom processing. Glass for a large area of the glass curtain wall to be controlled in the steel, choose semi-tempered glass, that is, the stress can not be too large to avoid the wind caused by vibration and blew.
According to the use of the original glass of different, can be made of ordinary tempered glass, heat-tempered glass, Caizhao tempered glass, tempered glass and so on.