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    • 3. 发明授权
    • .alpha.-alumina
    • α-氧化铝
    • US06165437A
    • 2000-12-26
    • US805044
    • 1997-02-24
    • Masahide MohriYoshio UchidaYoshinari SawabeHisashi Watanabe
    • Masahide MohriYoshio UchidaYoshinari SawabeHisashi Watanabe
    • C01F7/02C01F7/44C30B25/00
    • C01F7/442C01F7/02C01P2004/03C01P2004/30C01P2004/40C01P2004/42C01P2004/52C01P2004/54C01P2004/60C01P2004/61C01P2004/62C01P2006/80C30B25/00C30B29/20
    • .alpha.-Alumina comprising .alpha.-alumina single crystal particles which are homogeneous containing no crystal seed inside the particles; have an octa- or higher polyhedral shape; have a D/H ratio of from 0.5 to 3.0, wherein D represents a maximum particle diameter parallel to a hexagonal lattice plane of a hexagonal close-packed lattice of the particles, and H represents a diameter perpendicular to the hexagonal lattice plane; have a number average particle diameter of more than 5 .mu.m and not more than 30 .mu.m; have a sodium content of less than 5 ppm in terms of Na.sub.2 O; and have an alumina purity of not less than 99.90% by weight. .alpha.-Alumina in a powder form composed of .alpha.-alumina single crystal particles having a high punity, a fine and uniform composition, a narrow particle size distribution, and an octa- or higher polyhedral shape which are not aggromerates. The .alpha.-alumina of the invention is useful as an abrasive, a raw material for sintered products, a raw material for a encapsulations, a raw material for ceramic filters, etc. and, owing to its high purity, particularly useful as a raw material for single crystals, e.g., yttrium aluminum garnet (YAG), sapphire, ruby, etc. and as a raw material for high purity sintered products.
    • α-氧化铝,其包含在颗粒内不含晶种的均匀的α-氧化铝单晶颗粒; 具有八面体或更高的多面体形状; D / H比为0.5〜3.0,其中D表示与六方孔密堆积晶格的六方晶格平面平行的最大粒径,H表示垂直于六方晶格面的直径; 数均粒径超过5μm,不超过30μm; 钠含量按Na2O计小于5ppm; 并且具有不小于99.90重量%的氧化铝纯度。 由具有高惩罚性,细小且均匀的组成,窄的粒度分布和不具有聚集性的八面体或更高的多面体形状的α-氧化铝单晶颗粒组成的粉末形式的α-氧化铝。 本发明的α-氧化铝可用作研磨剂,烧结产品的原料,封装用原料,陶瓷过滤器用原料等,由于其纯度高,特别用作原料 用于单晶,例如钇铝石榴石(YAG),蓝宝石,红宝石等,并作为高纯度烧结产品的原料。