Alpha Alumina-Based Abrasive Grain Containing Silica And Iron Oxide

摘要

Based on the theoretical oxides, alpha alumina based ceramic abrasive particles comprising Al ₂ O ₃ , Fe ₂ O _3, and SiO ₂ have a surface roughness height greater than about 200 nanometers and a density greater than about 3.50 g / cm 3. Preferably, the alpha alumina based ceramic abrasive has an alpha alumina microcrystalline with an average microcrystalline size of less than about 0.5 micrometer (preferably less than about 0.3 micrometer). The presence of SiO ₂ blended with Fe ₂ O ₃ increases the amount of fracture in the crystal grains of the abrasive grains, reduces alpha alumina crystallite growth during sintering of the abrasive grains, extends at least one unit lattice dimension of the abrasive grains, And generally improves the grinding performance of abrasive grains. In another aspect, alpha alumina based ceramic abrasive particles comprising Al ₂ O ₃ and SiO ₂ , based on the theoretical oxides, are disclosed.