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What type of glass is used on the touch screen?


The glass is made of quartz sand, soda ash, feldspar and limestone. After mixing, high temperature melting and homogenization, the glass is processed and formed by annealing. Widely used in construction, daily use, art, instrumentation and other fields, rich in variety and superior performance. In addition to making a variety of glass doors and windows, we often make them into a variety of lenses, decorations and so on. I want to know what type of glass is used on the touch screen, and how to make chemically tempered glass. See below.
First, what type of glass is used by the touch screen
The touch screen glass is mainly used for the touch screen panel, and is a chemically strengthened glass. The glass material is a special soda silicate glass material, which is enhanced by sodium and potassium ion exchange to achieve the purpose of glass strengthening, impact resistance and surface hardness are remarkable. Upgrade.
With the continuous updating of raw material technology and the continuous improvement of various production processes, glass has not been limited to function as a touch screen panel. The glass with the function of panel and function has already been available in the market, but the current mass production indicators have not yet reached It is required that this technology has not been widely applied.
Second, the production principle of chemical tempered glass
Chemically tempered glass is produced by a low temperature ion exchange process. The so-called low temperature system means that the exchange temperature is not higher than the glass transition temperature, and is relative to the temperature range of the high temperature ion exchange process above the transition temperature and below the softening point. The simple principle of the low-temperature ion exchange process is to exchange ions with smaller radius in the surface of the glass with ions with larger radius in the solution in an alkali salt solution of about 400 ° C, such as lithium ions in the glass and potassium or sodium in the solution. Ion exchange, the sodium ions in the glass exchange with the potassium ions in the solution, and the compressive stress is formed on the surface layer of the glass by the difference in the volume of the alkali ions. The amount of large ions squeezed into the glass surface is directly proportional to the sheet laminate stress, so the amount of ion exchange and the exchanged skin depth are key indicators of the enhancement effect.
The stress distribution of ion-exchanged tempered glass is different from that of physical tempered glass. The thickness of the compressive stress of the surface layer of the former is small, and the internal tensile stress is not large. The internal tensile stress layer of the chemically tempered glass is not damaged like physical tempering. The reason why glass is broken into small pieces. Since the ion exchange layer is thin, the chemical tempered glass method is effective for enhancing the thin glass, and the reinforcing effect for the thick glass is not obvious, and is particularly suitable for reinforcing the glass of 2 to 4 mm thick.
Related concepts
Glass
Glass is an amorphous inorganic non-metallic material, generally using a variety of inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as the main raw material, and a small amount of auxiliary materials are added. of. Its main components are silica and other oxides. The chemical composition of ordinary glass is Na2SiO3, CaSiO3, SiO2 or Na2O·CaO·6SiO2, etc. The main component is a silicate double salt, which is an amorphous solid with a random structure. Widely used in buildings, used to separate light from the wind, is a mixture. There are also colored glass in which a certain metal oxide or salt is mixed to exhibit color, and tempered glass obtained by physical or chemical methods. Sometimes some transparent plastics (such as polymethyl methacrylate) are also called plexiglass.
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