Cheap Brown Fused Alumina Factory In Japan

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

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pink fused alumina is a trihedral mineral with no = 1.768, NE = 1.760, NE no = 0.008, relative density of 4.02 and hardness of 9. However, the coefficient of thermal expansion of corundum is 8.6 × 10-6 ℃ - 1, which belongs to the material with lower thermal shock resistance. Alumina products have very high strength, the normal pink aluminium oxide temperature flexural strength can reach more than 250 MPa, and the flexural strength is 150 MPa at 1000 ℃.(cheap brown fused alumina factory in japan)

Corundum sometimes contains a small amount of impurities such as Fe, Mn, Cr and Ti. pink corundum can be dyed in different colors by these impurities. The melting point of corundum is as high as 2050 ℃. The refractoriness of high quality corundum products is greater than 1900 ℃, the start temperature of load softening is about 1850 ℃, the black synthetic corundum ultimate service temperature is 1950 ℃, and the long-term service temperature is 1800 ℃.

(cheap brown fused alumina factory in japan)High density alumina products can better resist the corrosion of molten metals such as iron, black corundum, nickel and vanadium; at normal temperature, they are not corroded by sulfuric acid, hydrochloric acid, nitric acid and hydrofluoric acid, but at high temperature, sodium fluoride and concentrated sulfuric acid have certain corrosion on black aluminum oxide abrasive 70 grit. Alumina has certain resistance to the erosion of glass and slag. 

According to the different manufacturing methods, white alumina can be divided into two categories: first, the corundum raw materials directly made of bauxite, such as brown corundum and high alumina corundum; second, the alumina is extracted from bauxite, and then the industrial alumina is made into aluminum oxide sandblasting media raw materials, aluminium oxide 36 grit is the highest, such as white corundum, dense corundum and sintered corundum.(cheap brown fused alumina factory in japan)

The hardness of brown aluminium oxide is 9, which is only lower than that of diamond and a few synthetic hard minerals. It can be seen from the above table that in terms of purity and price, the normal temperature compressive strength can reach 2000 MPa; dense corundum is the second, high alumina corundum is the third, and black aluminum oxide blast media is the lowest. White corundum and dense corundum are produced by industrial alumina.

(cheap brown fused alumina factory in japan)The purity of dense corundum is lower than that of white corundum, but its density is higher than that of brown aluminum oxide. Sintered corundum is a kind of refractory material, which is made of industrial aluminum oxide, milled, pressed and sintered at 1800 ℃. The density of black aluminum oxide 70 grit abrasive media is very high, the apparent porosity is low, the bulk density is ≥ 3.50g/cm3, the apparent porosity is ≤ 4.5%.

Therefore, brown fused alumina has the properties similar to fused corundum: it has good volume stability at high temperature, is not affected by reducing atmosphere, and has certain resistance to the erosion of liquid metal and glass. The purity of brown corundum is lower than that of high alumina, but its true density is higher than that of high alumina. High alumina corundum and corundum sand are both produced from bauxite.(cheap brown fused alumina factory in japan)