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Brown Fused Aluminum Oxide Factory South Korea

Corundum is a polycrystalline α - alumina material. brown fused alumina is one of the main components of the earth's crust, which is rich in resources and relatively cheap. fused alumina has the physical and chemical characteristics of high temperature resistance, high strength, high hardness, electrical insulation, corrosion resistance, etc. As a result, corundum is widely used as refractory.

Brown Fused Aluminum Oxide Factory South Korea MOQ: 1 Ton! 19 Years Experience Brown Fused Aluminum Oxide Factory, 35,000m² Workshop Area, Free Samples, Fast Delivery!

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Corundum is a trihedral mineral with no = 1.768, NE = 1.760, no-ne = 0.008, relative density of 4.02 and hardness of 9. black corundum sometimes contains a small amount of impurities such as Fe, Mn, Cr and Ti. The refractoriness of high-quality corundum products is greater than 1900 ° C, the silicon carbide companies starting temperature of load softening is about 1850 ° C, and the long-term service temperature is 1800 ° C.(brown fused aluminum oxide factory south korea)

However, the coefficient of thermal expansion of brown aluminum oxide is 8.6, which belongs to the material with lower thermal shock resistance. The hardness of corundum is 9, which is only lower than that of diamond and a few synthetic hard minerals. Alumina products have very high strength, the normal temperature flexural strength can reach more than 250 MPa, and the arc fused alumina flexural strength is 150 MPa at 1000 ℃.

(brown fused aluminum oxide factory south korea)High density alumina products can better resist the corrosion of molten metals such as iron, pink corundum, nickel and vanadium; at normal temperature, hydrochloric acid, nitric acid and hydrofluoric acid, but at high temperature, sodium fluoride and concentrated sulfuric acid have certain corrosion on alumina. But if it is restored to three-dimensional image, the black oxide aluminum crystal is not necessarily plate-like.

According to the different manufacturing methods, brown aluminium oxide can be divided into two categories: first, the corundum raw materials directly made of bauxite, they are not corroded by sulfuric acid, such as brown corundum and high alumina corundum; second, the alumina is extracted from bauxite, and then the industrial alumina is made into corundum raw materials, such as low density white alumina, dense corundum and sintered corundum.

(brown fused aluminum oxide factory south korea)silicon carbide price has certain resistance to the erosion of glass and slag. Sintered corundum is a kind of granular corundum material, the normal temperature compressive strength can reach 2000 MPa; which is sintered at 1750-1900 ° C with industrial alumina as raw material and milled into pellets or billets. In terms of performance, "plate corundum" has better thermal shock resistance than fused white fused alumina manufacturer

The melting point of white alumina is as high as 2050 ° C. Generally, the Al2O3 content of sintered corundum is more than 99.3%, the true density is more than 3.98/gcm3, the bulk density is more than 3.4g/cm3, and the apparent porosity is less than 5%. "Plate-like corundum" is named for its brown fused aluminium oxide crystal similar to plate shape when viewed under the two-dimensional cross-section of the microscope.(brown fused aluminum oxide factory south korea)

In fact, "plate corundum" is only a kind of high-purity green carborundum material sintered at high temperature. In the "plate corundum", α - Al203 crystal is fully developed, with a grain size of 40-200um and many 5? 15um closed pores. Dense corundum is a kind of fused corundum, the limiting service temperature is 1950 ° C, which is made of industrial white fused alumina suppliers and a small amount of additives.

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Brown Fused Alumina And White Fused Alumina MOQ: 1 Ton! 19 Years Manufacturing Exprience, 35,000m² Workshop Area, Factory Price, Free Samples, Fast Delivery!

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