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The purity of opaque fused quartz is lower than that of transparent quartz, but it is much higher than ordinary quartz, so it is a good shell refractory(brown fused alumina price). The structure of SiO2 is mainly composed of quartz, tridymite and cristobalite(white fused alumina price). The amorphous silica obtained from pure quartz melt under supercooling condition is called fused quartz or quartz glass, which can be divided into transparent and opaque types.

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The melting point of fused quartz is about 1713 ℃, and its coefficient of linear expansion is very low(white alumina). In almost all refractories, fused quartz has the smallest coefficient of thermal expansion, and there is no symmetry and periodicity(black aluminium oxide). The other is different types of polycrystalline transformation (also known as primary crystal transformation), namely a-quartz-a-scale quartz → a-cristobalite.(black aluminium oxide grains wholesale suppliers uk)

And it can only happen in the presence of mineralizer(black corundum). However, the resistance of fused quartz to alkali and alkaline salt is poor, so it is not suitable for application in strong alkali medium. It can also be rapidly cooled in air when heated to 1300 ℃. In the hexagonal cell, six a1-0 layers overlap each other(steel grid). Fused quartz has good chemical stability for acidic substances, so it is an excellent acid resistant material.

(black aluminium oxide grains wholesale suppliers uk)The fused quartz can be rapidly cooled from 1100 ℃ to 20 ℃ cold water without damage(pink corundum). Transparent fused quartz is made of crystal stone (the purest quartz crystal is called crystal, SiO2 > 99.95%, hexagonal columnar cone shaped, melted by oxygen flame or resistance furnace, and then cooled rapidly(brown fused aluminum oxide factory). Fused quartz is expensive and used as the matrix material of ceramic core in investment casting.

The melting point of fused corundum is high (2050 ℃), and it is stable below this temperature(glass bead blasting media suppliers). Because the coefficient of thermal expansion of fused quartz is very small, it can be used as shell material to improve the dimensional accuracy of castings(white fused alumina manufacturer). When the fused quartz contains large bubbles, foreign inclusions, uneven melting and internal stress, its mechanical properties will decline.(black aluminium oxide grains wholesale suppliers uk)

According to the theory(garnet abrasive), fused quartz is a silicon oxygen tetrahedron, which is connected to form a three-dimensional network through the vertex angle, but the arrangement is irregular. Each tetrahedron of cristobalite keeps a certain direction and periodic distance regularly, while fused quartz has no such regularity(brown fused aluminum oxide suppliers). In the temperature range of 100 ~ 1200 ℃, it only varies between (0.51 ~ 0.63) ×℃.

(black aluminium oxide grains wholesale suppliers uk)Except hydrofluoric acid and hot phosphoric acid, any concentration of organic and inorganic acid can hardly erode fused quartz even at high temperature(garnet suppliers). Its acid resistance is superior to all acid resistant metals and alloys and general organic acid resistant materials(white aluminum oxide blast media). Therefore, it can be dissolved in a strong alkaline hot solution such as sodium hydroxide or potassium hydroxide (to form soluble silicate).