Abrasive grains based on alpha alumina containing silica and iron oxide

摘要

(57) ceramic abrasive grains of alpha alumina-based containing SiO ₂ and _3, Fe ₂ O ₃ Al ₂ O in the [summary] theoretical oxide basis. The abrasive grain has a density of greater than about ³ 3.5g / cm height and about 200nm is greater than the surface roughness. Preferably, the ceramic abrasive grains of the above alpha alumina-based, Alpha has a (0.3μm more preferably less than) less than about 0.5μm microcrystalline average particle size - has the alumina crystallites. The presence of SiO ₂ in combination with Fe ₂ O _3, transgranular fracture amount of the abrasive grains is increased, the growth of the alpha alumina crystallites during sintering of the abrasive grain is reduced, and the grinding of the abrasive grain is generally performance is improved. In another embodiment, Al ₂ O _3, and method for producing a ceramic abrasive grain of the alpha alumina-based which contains SiO ₂ is disclosed on a theoretical oxide basis.