| 摘要 |
FIELD: aluminium oxide production. SUBSTANCE: a-aluminium oxide contains monocrystalline homogeneous particles which include no crystal seed; have octa- or higher polyhedral form; have D/H ratio from 0.5 to 3.0 where D is maximum particle diameter being in parallel to hexagonal tightly packed lattice plane; have average diameter of the main fraction greater than 5 mcm and not greater than 30 mcm; have sodium content (as sodium oxide) less than 0.05 wt %; and contain at least 99.90 wt % aluminium oxide. NaO-Aluminium oxide is a fine grained powder with close distribution of particles by their size. α-Aluminium oxide of invention may be used as abrasive, raw material for caked products, hermetics, ceramic filters, etc., and, due to its purity, may be used, in particular, as raw material for monocrystals, for example, those of garnet, rubin, etc. EFFECT: elevated purity of aluminium oxide. |
