Cheap Aluminium Oxide Grit Suppliers South Africa

brown fused alumina that meets typical technical conditions is composed of more than 95% of α-alumina crystals, and is composed of a solid solution of Al2O3 containing Ti2O3. Therefore, the amount of glassy slag and the distribution of impurities with α-alumina grains are the main factors affecting the properties of brown corundum.

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The amount of glassy slag and the distribution of impurities with α-alumina grains are the main factors affecting the properties of brown aluminum oxide. What is glassy slag and its α-alumina grains, it is necessary to have a simple understanding of the structure of brown corundum, so as to avoid unexpected quality problems. Microscopic examination of glass bead abrasive showed that it was composed of α-alumina grains and was stuck together by a small amount of glassy slag (see Figure 2).

In order to ensure that the quality of the arc fused alumina abrasive smelted is better, our factory uses high content bauxite for production. Alpha alumina is more stable. Chemically stable, resistant to acid and alkali. These oxides constitute the glass phase, which has a relatively low solubility in the crystal structure of α-alumina grains. It is made of abrasive tools, suitable for aluminum oxide blasting abrasive grinding high carbon steel, high speed steel, stainless steel and so on. 

Therefore, high bauxite resources are about to be urgent. White corundum is made of high-quality aluminum oxide powder through electric melting. Its hardness is slightly higher than that of brown alumina, with slightly lower toughness, high purity, good self-sharpening, strong grinding ability, low heat generation, high efficiency, acid and alkali corrosion resistance, aluminum oxide abrasive blasting grit high temperature resistance, and good thermal stability.

black oxide aluminum is also widely used in precision casting, steel refractory, chemical refractory, 95 ceramics, decorative porcelain and other ceramics for daily life, as well as high-tech industries such as military industry and electronics. Corundum is a crystalline mineral of α-alumina. Corundum is a refractory material synthetic corundum price, and its hardness is second only to diamond. The mineral structure is a trigonal crystal system and a hexagonal bottom heart lattice.

Most of the glassy slag is composed of glass beads supplier, titanium dioxide, and other trace oxides present in the electric arc furnace. In addition, corundum is also used in industries such as refractory materials, metallurgical auxiliary materials, abrasive cloth and abrasive paper. The crystals are barrel-shaped, short-column-shaped, and a few are plate-shaped or have thick stripes on the surface of the double cone. There are many alumina grit variations.

Bulk density is 3.95 ~ 4.1g / cm3, Mohs hardness is 9, garnet abrasive melting point is 2050 ℃, boiling point is 3400 ~ 3700 ℃, heat of fusion is 246.4kJ / kg, heat of evaporation is 6160.7kJ / kg, thermal conductivity (1000 ℃) It is 21.1W / (m · K), linear expansion coefficient (20 ~ 1000 ℃) is 8.0 × 10-6 / ℃, conductivity (567 ℃) 2.71 / (Ω · m), (1230 ℃) 1.96 × 10- 4 / (Ω · m), elastic modulus 36.3 × 1010Pa. The aggregate is a dense corundum abrasive granular block.