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    Process for producing &agr;-alumina
    1.
    发明授权
    Process for producing &agr;-alumina 失效
    α-氧化铝生产工艺

    公开(公告)号：US06521203B1

    公开(公告)日：2003-02-18

    申请号：US08922478

    申请日：1997-09-03

    申请人： Masahide Mohri ,  Yoshio Uchida ,  Yoshinari Sawabe ,  Hisashi Watanabe

    发明人： Masahide Mohri ,  Yoshio Uchida ,  Yoshinari Sawabe ,  Hisashi Watanabe

    IPC分类号： C01F700

    CPC分类号： C01F7/442 ,  C01F7/02 ,  C01P2004/03 ,  C01P2004/30 ,  C01P2004/40 ,  C01P2004/42 ,  C01P2004/52 ,  C01P2004/54 ,  C01P2004/60 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/80 ,  C30B25/00 ,  C30B29/20

    摘要： A process for producing &agr;-alumina containing &agr;-alumina single crystal particles characterized in that at least one of a transition alumina and transition alumina precursor is calcined in an atmosphere containing at least 1% by volume of hydrogen chloride at a temperature of not less than 600° C., preferably from 600 to 1,400° C., and more preferably from 800 to 1,200° C. Aluminum hydroxide, alum, aluminum sulfate, etc. are used as the alumina raw material capable of being converted to transition alumina on heating. &agr;-Alumina comprising octahedral or higher polyhedral &agr;-alumina single crystal particles have a high alumina purity above a given level, are fine and homogeneous, have a narrow particle size distribution, are not agglomerated particles, and can be obtained from raw materials of various kinds, purities, shapes, sizes, and compositions.

    摘要翻译： 一种生产含α-氧化铝的α-氧化铝单晶颗粒的方法，其特征在于，在含有至少1体积％氯化氢的气氛中，在不少于1重量％的温度下煅烧过渡氧化铝和过渡型氧化铝前体中的至少一种 600℃，优选600〜1400℃，更优选800〜1200℃。使用氢氧化铝，明矾，硫酸铝等作为能够在加热时转化为过渡型氧化铝的氧化铝原料 。 包含八面体或更高的多面体α-氧化铝单晶颗粒的α-氧化铝具有高于给定水平的高氧化铝纯度，细小且均匀，具有窄的粒度分布，不是附聚颗粒，并且可以从各种原料获得 种类，纯度，形状，尺寸和组成。

    Preparation method of dense sintered bodies for solid electrolytes
    2.
    发明授权
    Preparation method of dense sintered bodies for solid electrolytes 失效
    固体电解质致密烧结体的制备方法

    公开(公告)号：US5496513A

    公开(公告)日：1996-03-05

    申请号：US984199

    申请日：1992-12-02

    申请人： Kenji Nakane ,  Tetsu Umeda ,  Masahide Mohri

    发明人： Kenji Nakane ,  Tetsu Umeda ,  Masahide Mohri

    IPC分类号： C04B35/113 ,  C04B35/119 ,  C04B35/65 ,  B22F3/16

    CPC分类号： C04B35/65 ,  C04B35/113 ,  C04B35/119

    摘要： A method of preparing dense sintered bodies of beta alumina suitable for solid electrolytes, which comprises preparing a shaped body from a mixture containing an aluminum powder, a sodium compound, a structure stabilizer and a zirconia powder or from a mixture containing an aluminum powder, an alumina powder, a sodium compound, a structure stabilizer and a zirconia powder, and reaction-sintering the shaped body.

    摘要翻译： 一种制备适用于固体电解质的β氧化铝的致密烧结体的方法，其包括由含有铝粉末，钠化合物，结构稳定剂和氧化锆粉末的混合物或从含有铝粉末， 氧化铝粉末，钠化合物，结构稳定剂和氧化锆粉末，并对成形体进行反应烧结。

    Method for producing zirconia-based sintered body
    3.
    发明授权
    Method for producing zirconia-based sintered body 失效
    氧化锆系烧结体的制造方法

    公开(公告)号：US5296421A

    公开(公告)日：1994-03-22

    申请号：US991946

    申请日：1992-12-17

    申请人： Yasunori Nishida ,  Masahide Mohri

    发明人： Yasunori Nishida ,  Masahide Mohri

    IPC分类号： C04B35/48 ,  C04B35/488

    CPC分类号： C04B35/488

    摘要： A sintered body where alumina is dispersed in a zirconia matrix in which yttria has been doped to form a solid solution can be obtained by compacting a mixed powder comprising zirconia or yttria-stabilized zirconia and yttrium-aluminum complex oxide and sintering the resulting compacted body. This sintered body comprises a fine zirconia matrix in which fine alumina particles are dispersed to strengthen it and is excellent in flexural strength and fracture toughness and has a practically effective oxygen ionic conductivity.

    摘要翻译： 通过将包含氧化锆或氧化钇稳定的氧化锆和钇铝复合氧化物的混合粉末压实并烧结所得到的压实体，可以获得其中氧化铝分散在已经掺杂氧化钇以形成固溶体的氧化锆基质中的烧结体。 该烧结体包括细氧化铝基体，其中分散有细小的氧化铝颗粒以增强其，并且具有优异的弯曲强度和断裂韧性，并且具有实际有效的氧离子导电性。

    Alumina composition, alumina molded article, alumina ceramics, and process for producing ceramics
    6.
    发明授权
    Alumina composition, alumina molded article, alumina ceramics, and process for producing ceramics 失效
    氧化铝组合物，氧化铝模制品，氧化铝陶瓷，以及陶瓷制造方法

    公开(公告)号：US5672554A

    公开(公告)日：1997-09-30

    申请号：US654029

    申请日：1996-05-28

    申请人： Masahide Mohri ,  Norio Matsuda ,  Shinichiro Tanaka ,  Yoshio Uchida

    发明人： Masahide Mohri ,  Norio Matsuda ,  Shinichiro Tanaka ,  Yoshio Uchida

    IPC分类号： C04B35/10 ,  C01F7/02 ,  C04B35/111 ,  C04B35/626 ,  H01B3/12

    CPC分类号： C01F7/02 ,  C04B35/111 ,  C04B35/626 ,  C01P2004/03 ,  C01P2004/52 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2006/10 ,  C01P2006/16 ,  C01P2006/80

    摘要： An alumina composition, an alumina molded article, prepared from the alumina composition, an alumina ceramic prepared by sintering the alumina molded article, and a process for producing the ceramic; the alumina composition comprising .alpha.-alumina particles having a ratio of the shortest diameter to the longest diameter of from 0.3 to 1; and a size distribution of not more than 5, as expressed in terms of a D.sub.90 /D.sub.10 ratio, wherein D.sub.10 and D.sub.90 represent a cumulative 10% diameter and a cumulative 90% diameter, respectively, of a cumulative distribution depicted from the small diameter side, or comprising .alpha.-alumina particles having a polyhedral shape; 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 .alpha.-alumina, and H represents a particle diameter perpendicular to the lattice plane; and a size distribution of not more than 5, as expressed in terms of a D.sub.90 /D.sub.10 ratio, wherein D.sub.10 and D.sub.90 are as defined above.

    摘要翻译： 由氧化铝组合物制备的氧化铝组合物，氧化铝模制品，通过烧结氧化铝模塑制品制备的氧化铝陶瓷及其制造方法; 所述氧化铝组合物包含具有0.3至1的最短直径与最长直径之比的α-氧化铝颗粒; 和D90 / D10比率表示的不大于5的尺寸分布，其中D10和D90分别表示从小直径侧示出的累积分布的累积10％直径和累积90％直径 ，或包含具有多面体形状的α-氧化铝颗粒; D / H比为0.5至3.0，其中D表示平行于α-氧化铝的六方密堆积晶格的六方晶格平面的最大粒径，H表示垂直于晶格面的粒径; 尺寸分布不大于5，以D90 / D10比表示，其中D10和D90如上所定义。

    .alpha.-alumina
    8.
    发明授权
    .alpha.-alumina 失效
    α-氧化铝

    公开(公告)号：US06165437A

    公开(公告)日：2000-12-26

    申请号：US805044

    申请日：1997-02-24

    申请人： Masahide Mohri ,  Yoshio Uchida ,  Yoshinari Sawabe ,  Hisashi Watanabe

    发明人： Masahide Mohri ,  Yoshio Uchida ,  Yoshinari Sawabe ,  Hisashi Watanabe

    IPC分类号： C01F7/02 ,  C01F7/44 ,  C30B25/00

    CPC分类号： C01F7/442 ,  C01F7/02 ,  C01P2004/03 ,  C01P2004/30 ,  C01P2004/40 ,  C01P2004/42 ,  C01P2004/52 ,  C01P2004/54 ,  C01P2004/60 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/80 ,  C30B25/00 ,  C30B29/20

    摘要： .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.

    摘要翻译： 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。

    Alpha-alumina and method for producing same
    10.
    发明授权
    Alpha-alumina and method for producing same 失效
    α-氧化铝及其制造方法

    公开(公告)号：US6162413A

    公开(公告)日：2000-12-19

    申请号：US925583

    申请日：1997-09-08

    申请人： Shinji Fujiwara ,  Hiroshi Tabuchi ,  Masahide Mohri

    发明人： Shinji Fujiwara ,  Hiroshi Tabuchi ,  Masahide Mohri

    IPC分类号： C01F7/02 ,  C01F7/44 ,  C01F7/46 ,  C01F7/00

    CPC分类号： C01F7/02 ,  C01F7/442 ,  C01F7/46 ,  C01P2004/52 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/10 ,  C01P2006/80

    摘要： A powdery .alpha.-alumina having an alumina purity of at least 99.8 wt. %, a sodium content of 40 ppm or less and an iron content of 20 ppm or less, which is obtained by grinding aluminum hydroxide which is produced by the Bayer process or a transition alumina which is obtained by precalcining aluminum hydroxide produced by the Bayer process, and calcining the aluminum hydroxide or transition alumina in an atmosphere containing 1 vol. % or more of a hydrogen chloride gas, or an atmosphere containing 1 vol. % or more of a chlorine gas and 0.1 vol. % or more of steam, at a temperature of 600 to 1400.degree. C.

    摘要翻译： 具有至少99.8重量％的氧化铝纯度的粉末状α-氧化铝。 ％，钠含量为40ppm以下，铁含量为20ppm以下，这是通过研磨通过拜耳法生产的氢氧化铝或通过预煅烧由拜耳法生产的氢氧化铝获得的过渡氧化铝获得的 ，并在含有1体积％的气氛中煅烧氢氧化铝或过渡氧化铝。 ％以上的氯化氢气体，或含有1体积％ ％以上的氯气和0.1体积％。 ％以上的蒸汽，温度为600〜1400℃。