Polycrystalline corundum is based on black corundum, adding new elements in the production process, optimizing the main crystal image of black corundum, its color is brown-black, with high hardness, strong toughness, and good self-sharpness. Polycrystalline corundum retains the advantages of black corundum with good self-sharpness, high sharpness, less heat generation, and high surface finish, which greatly improves the durability of black corundum.
Black fused alumina
Black fused alumina is a dark gray crystal obtained from the fusion of high iron bauxite or high alumina bauxite in electric arc furnace. Its main components are α- Al2O3 and hercynite.it’s an excellent alternative abrasion-proof material.
Black silicon carbide
Black silicon carbide is made through pyrolytic smelting of quartz sand and petroleum coke (or tar) in resistance furnace. It has stable chemical properties, high conductivity coefficient, low coefficient of thermal expansion and excellent wear-resistance, and is suitable for refractory and grinding applications.
Calcined brown corundum
Calcined brown corundum is made by processing traditional brown corundum at elevated temperature to separate out or evaporate the impurities inside. Afterwards, it becomes more pure, more rough at surface and therefore more hydrophilic. Also the microcracks generated by crushing bridged during the process, further improving its tenacity and strength.
Ceramic coated alumina
Ceramic coated alumina is a new kind of corundum material, forming after high temperature calcination of white corundum. It retains the sharpness of ordinary white corundum, but improved toughness, no dark fringe inside, and improved crush resistance. Also after coating with metal salt and ceramics, it becomes more cohesive. Cutting disks made from it are sharper and more durable.