Quartz glass plate is easy to be purified due to the use of liquid raw materials. It can melt transparent quartz glass crucible with high purity. After groove sinking, heat treatment and precision machining, it can be made into a variety of materials with excellent optical properties.
Quartz glass plate is a special industrial technology glass made of silica, which is a very good basic material. Quartz glass plates have a series of excellent physical and chemical properties, such as: quartz glass tubes.
1. High temperature resistance. Quartz glass has a softening point temperature of about 1730 ° C and can be used for a long time at 1100 ° C. The maximum use temperature can reach 1450 ° C in a short time.
2. Corrosion resistance. In addition to hydrofluoric acid, quartz glass hardly reacts with other acids. Its acid resistance is 30 times that of ceramics and 150 times that of stainless steel. Especially at high temperatures, it is impossible for any other engineering materials.
Quartz glass is a single component glass of silica and is generally classified into two types: transparent quartz glass and opaque quartz glass (fused quartz). Transparent quartz glass has only a very small amount of bubbles, and has a relatively high optical uniformity and transparency. It is made of crystal or silicon tetrachloride as a raw material and is melted at a high temperature. The content of SiO2 is above 99.95%, and that of high-purity quartz glass is more than 99.999%. The opaque quartz glass is made of vein quartz and quartz sand, and is melted at a high temperature, and contains SiO 299.5% or more.
Since quartz glass is a network skeleton composed of a simple (SiO4) tetrahedron, and the silicon oxygen bond is strong and compact, the mechanical strength and heat resistance are high, the coefficient of thermal expansion is small, and the chemical stability is also good. The viscosity is large and the softening point is also high. Due to the absence of interstitial cations in the network, the density is small, the conductivity and the dielectric loss are also small.
The mechanical properties of quartz glass are better than that of hard glass and ceramics. The strength of newly pulled non-defective quartz glass fiber is 24100×106 Pa. The quartz tube and quartz glass equipment with small diameter can withstand a lot of pressure, in quartz glass products. If there are macro defects such as bubbles, foreign matter, uneven melting and residual stress, they will affect their strength and reduce them.
The strength of quartz glass begins to increase with temperature. When it reaches a certain temperature, it decreases with the increase of temperature. The transparent quartz glass increases from room temperature to 900oC, the tensile strength doubles, and the impact strength shows the maximum.
The thermal expansion coefficient of hot quartz glass is only 1/10 to 1/20 of ordinary glass, and the purity of quartz glass has an influence on the expansion coefficient. Due to the irregular voids in the quartz glass network structure, many gases are likely to diffuse and penetrate. The characteristics that gases with relatively small atomic diameters such as helium, neon, hydrogen, etc. are more permeable in quartz glass, while nitrogen, Oxygen and other atoms are relatively large, and the activity is relatively small. Even at 600-700oC, the permeation and diffusion in quartz glass is low, so quartz glass can be used as 10-5-10-6mmHg under negative pressure and heating. The operating vessel can be used in high temperature vacuum equipment.
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