Process for producing alpha-alumina powder
    3.
    发明公开
    Process for producing alpha-alumina powder 失效
    Verfahren zur Herstellung von Alpha-Alumiumoxidpulver。

    公开(公告)号:EP0631986A1

    公开(公告)日:1995-01-04

    申请号:EP94304815.7

    申请日:1994-06-30

    IPC分类号: C01F7/44 C01F7/30

    摘要: A process for producing α-alumina power constituted by α-alumina single crystal particles comprises calcining at least one of transition alumina and a transition alumina precursor, in a gas atmosphere containing (1) at least 5% of F, Cl, Br and/or I, (2) at least 1% HF, HBr and/or HI, or (3) a component prepared from at least 1%, based on the total gas atmosphere, of F gas, Br gas and/or I gas, and at least 0.1% of steam. The percentages are by volume and based on the total gas atmosphere.
    The α-alumina single crystal particles have high purity, homogeneity, a narrow primary particle size distribution and an octahedral or higher polyhedral shape. The powder can be obtained from alumina raw materials of a variety of different kinds in an industrially advantageous manner, and is suitable as a raw material for abrasives, sintered products, plasma spraying materials, fillers, single crystals, supports for catalysts, fluorescent substances, encapsulants, ceramic filters and spacers for liquid cells.

    摘要翻译: 一种由α-氧化铝单晶颗粒构成的α-氧化铝粉末的方法包括在气体气氛中煅烧至少一种过渡氧化铝和过渡型氧化铝前体,所述气体气氛包含(1)至少5%的F,Cl,Br和/ 或I,(2)至少1%的HF,HBr和/或HI,或(3)基于总气体气氛,F气体,Br气体和/或I气体至少1%制备的组分, 和至少0.1%的蒸汽。 百分比是按气体总量计算的。 α-氧化铝单晶颗粒具有高纯度,均匀性,窄的一次粒度分布和八面体或更高的多面体形状。 该粉末可以以工业上有利的方式从各种不同种类的氧化铝原料获得,并且适合作为研磨剂,烧结产品,等离子喷涂材料,填料,单晶,催化剂载体,荧光物质, 密封剂,陶瓷过滤器和液体池的间隔物。

    Method for producing complex metal oxide powder
    6.
    发明公开
    Method for producing complex metal oxide powder 有权
    维生素Zur Herstellung von komplexen Metalloxidpulvern

    公开(公告)号:EP1199282A1

    公开(公告)日:2002-04-24

    申请号:EP01124238.5

    申请日:2001-10-15

    发明人: Uchida, Yoshio

    IPC分类号: C01G23/00

    摘要: A complex metal oxide powder composed of fine particles, each in an approximately spherical shape, is provided by a method for producing a complex metal oxide powder, which method comprises heating at least two kinds of metal salts, or a complex metal salt comprising at least two kinds of metals, to a temperature at which transition to a complex metal oxide occurs, and calcining the metal salts or the complex metal salt in an atmosphere containing a halogenated hydrogen gas.

    摘要翻译: 通过复合金属氧化物粉末的制造方法提供由微细粒子构成的复合金属氧化物粉末,其中,所述复合金属氧化物粉末大致为球状,该方法包括加热至少两种金属盐,或至少包含至少 两种金属,在发生与复合金属氧化物的转变的温度下,在含有卤化氢气体的气氛中煅烧金属盐或复合金属盐。

    Alpha-alumina powder and process for its production
    10.
    发明公开
    Alpha-alumina powder and process for its production 失效
    ALPHA-ALUMINA粉及其生产工艺。

    公开(公告)号:EP0620188A3

    公开(公告)日:1995-09-20

    申请号:EP94302622.9

    申请日:1994-04-13

    IPC分类号: C01F7/44 C01F7/32 C01F7/02

    摘要: A process for producing α-alumina powder comprises calcining transition alumina and/or a transition alumina precursor which transforms to transition alumina on heating, in a gas atmosphere containing (1) a hydrogen halide, (2) a component prepared from a halogen and steam or (3) a halogen, and in the presence of seed crystals and/or a shape-controlling agent. The product α-alumina powder comprises particles of a substantially octahedral or eicosa-hedral shape, a pre-determined structure, and a narrow primary particle size distribution; the powder is particularly useful as a raw material for preparing abrasives, fillers, sinters or spacers.

    摘要翻译: 一种生产α-氧化铝粉末的方法包括在包含(1)卤化氢的气体气氛中煅烧转变为过渡氧化铝的过渡氧化铝和/或过渡氧化铝前体,所述过渡氧化铝和/或氧化铝前体在加热时转化为过渡氧化铝,(2)由卤素和蒸汽 或(3)卤素,并且在晶种和/或形状控制剂的存在下进行。 产品α-氧化铝粉末包含基本上八面体或二十世纪 - 鲱鱼形状的颗粒,预定结构和窄的一次粒径分布; 该粉末作为用于制备研磨剂,填料,烧结体或间隔物的原料是特别有用的。