Types and uses of quartz glass

1. Varieties of quartz glass:

In terms of appearance, quartz glass can be divided into two categories: transparent and opaque. Transparent quartz glass can be divided into ordinary quartz glass, high-purity quartz glass and doped quartz glass.

According to the shape of the product, it can be divided into quartz glass pipes, quartz glass rods, quartz glass plates, quartz glass crucibles,quartz glass bells andquartz glass lamps, and quartz glass fiber and quartz wool.

In terms of special functions, there are also low-expansion quartz glass, radiation-resistant quartz glass, ultraviolet or infrared-transmitting quartz glass, and ultraviolet-filtering quartz glass.

In terms of manufacturing methods, quartz glass can also be divided into two categories, one is natural quartz glass and the other is synthetic quartz glass. Natural quartz glass is made of natural crystal or silica as raw materials through high temperature melting, and synthetic quartz glass is made of inorganic or organic silicon-containing liquid compounds (such as silicon tetrachloride) through flame hydrolysis synthesis process. Because synthetic quartz glass has higher purity and better quality than quartz glass made from natural raw materials, it is also called high-purity quartz glass, and natural quartz glass is also called ordinary quartz glass.

2. Main uses of quartz glass:

Because quartz glass has a series of special properties that cannot be replaced by other materials, the application of quartz glass involves a wide range of technical fields:

(1) Because quartz glass has excellent high temperature resistance, it is widely used in metallurgy, chemical and other industries that require high temperature resistance.

(2) Widely used in the nuclear industry and aerospace fields, the observation windows and thermal insulation shells of rockets and spacecraft are made of quartz glass.

(3) Because the chemical stability of quartz glass at high temperature is unmatched by other engineering materials, it is widely used in chemical, pharmaceutical and other industries.

(4) Quartz glass is widely used in high-tech fields such as national defense and new electric light sources due to its high temperature resistance and high transmittance.

(5) Due to the spectral characteristics of quartz glass, it can transmit not only visible light, but also infrared and ultraviolet rays, so it is widely used in microelectronics, information, lasers and astronomy. Optical fibers are made of quartz glass.

(6) Because the small-diameter transparent or opaque quartz glass tube manufactured by the continuous melting process is low in cost, but does not lose the characteristics of high temperature resistance, it is widely used in the electric light source industry and far-infrared light source industry where the quality of quartz glass is not too high. on the heater.

(7) Quartz glass is widely used in the production of electronic industry due to its high purity, high temperature resistance, low thermal expansion and other excellent properties, such as doping, diffusion, oxidation, annealing and other key processes of single crystal silicon wafers Quartz glass diffusion tube used in silicon wafers; quartz bell jar used in silicon wafer epitaxy process; flower basket and bracket used in silicon wafer pickling and ultrasonic cleaning process; silicon wafer carrier (quartz glass boat) used in silicon wafer diffusion process; drawing sheet Quartz crucibles and the like used in the crystalline silicon process are all made of quartz glass.

(8) In order to prevent pollution and improve the purity of the product, most of the rectification towers, volatilizers (bubblers) and feed pipes used in the production of polysilicon are made of quartz glass.