Brown fused alumina, also known as corundum, is a high purity abrasive material, often referred to as the "teeth of industry." It is widely used in industries such as refractory materials, grinding wheels, and sandblasting. What are its main components?
Brown fused alumina is produced from bauxite and coke (anthracite) as the main raw materials, through high-temperature treatment in an electric arc furnace. Its main chemical component is Al2O3, with a content ranging from 95.00% to 97.00%, and it also contains trace amounts of Fe, Si, Ti, etc. The varying content results in different grades of brown fused alumina; lower aluminum content corresponds to lower hardness and significant price differences. It has a microhardness of HV1800-2200, offering higher resistance than SiC. Brown fused alumina is an indispensable additive in various grinding and polishing equipment.
Brown corundum typically appears brownish, with Al2O3 ≥ 94.5%, SiO2 ≤ 2.5%, TiO2 ≤ 3.5%, and Fe2O3 ≤ 1%. Its mineral composition is primarily α-Al2O3, featuring rhombic, thick plate-like, and cracked granules at the center, with a surrounding abundance of silicon and calcium oxide melt crystals, appearing as long plates, and coarse grains showing skeletal sheet-like crystals. Its color largely depends on the amount of residual titanium oxide content.
The following image provides an introduction to the main chemical composition content and specifications for棕刚玉 (Brown fused alumina), including its uses.
Note: F for specifications used in solid bond abrasives and sandblasting.
P for coated abrasive specifications
W refers to micronized powder, 320# corresponds to W40.
