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    Method for thermal spray coating and rare earth oxide powder used therefor
    2.
    发明授权
    Method for thermal spray coating and rare earth oxide powder used therefor 有权
    热喷涂法和稀土氧化物粉末的使用方法

    公开(公告)号：US06733843B2

    公开(公告)日：2004-05-11

    申请号：US10423903

    申请日：2003-04-28

    申请人： Toshihiko Tsukatani ,  Yasushi Takai ,  Takao Maeda

    发明人： Toshihiko Tsukatani ,  Yasushi Takai ,  Takao Maeda

    IPC分类号： C23C410

    CPC分类号： C23C4/11 ,  Y10T428/25 ,  Y10T428/26 ,  Y10T428/2982

    摘要： The invention discloses an efficient method for the formation of a highly corrosion- or etching-resistant thermal spray coating layer of a rare earth oxide or rare earth-based composite oxide by a process of plasma thermal spray method by using a unique thermal spray powder consisting of granules of the oxide. The thermal spray granules are characterized by a specified average particle diameter of 5 to 80 &mgr;m with a specified dispersion index of 0.1 to 0.7 and a specified BET specific surface area of 1 to 5 m2/g as well as a very low content of impurity iron not exceeding 5 ppm by weight as oxide. The flame spat powder used here is characterized by several other granulometric parameters including globular particle configuration, particle diameter D90, bulk density and cumulative pore volume.

    摘要翻译： 本发明公开了一种通过使用独特的热喷涂粉末等离子体热喷涂方法形成稀土氧化物或稀土类复合氧化物的高耐腐蚀或耐蚀刻热喷涂层的有效方法， 的氧化物颗粒。 热喷雾颗粒的特征在于指定的平均粒径为5-80μm，指定的分散指数为0.1-0.7，指定的BET比表面积为1-5m 2 / g，并且含量非常低 的杂质铁作为氧化物不超过5ppm。 这里使用的火焰喷雾粉的特征在于几种其他粒度参数，包括球状颗粒构型，粒径D90，体积密度和累积孔体积。

    Method for thermal spray coating and rare earth oxide powder used therefor
    3.
    发明授权
    Method for thermal spray coating and rare earth oxide powder used therefor 有权

    公开(公告)号：US06576354B2

    公开(公告)日：2003-06-10

    申请号：US09893565

    申请日：2001-06-29

    申请人： Toshihiko Tsukatani ,  Yasushi Takai ,  Takao Maeda

    发明人： Toshihiko Tsukatani ,  Yasushi Takai ,  Takao Maeda

    IPC分类号： B32B1504

    CPC分类号： C23C4/11 ,  Y10T428/25 ,  Y10T428/26 ,  Y10T428/2982

    摘要： The invention discloses an efficient method for the formation of a highly corrosion- or etching-resistant thermal spray coating layer of a rare earth oxide or rare earth-based composite oxide by a process of plasma thermal spray method by using a unique thermal spray powder consisting of granules of the oxide. The thermal spray granules are characterized by a specified average particle diameter of 5 to 80 &mgr;m with a specified dispersion index of 0.1 to 0.7 and a specified BET specific surface area of 1 to 5 m2/g as well as a very low content of impurity iron not exceeding 5 ppm by weight as oxide. The flame spat powder used here is characterized by several other granulometric parameters including globular particle configuration, particle diameter D90, bulk density and cumulative pore volume.

    Rare earth hydroxide and method for the preparation thereof
    5.
    发明授权
    Rare earth hydroxide and method for the preparation thereof 有权
    稀土氢氧化物及其制备方法

    公开(公告)号：US06733882B2

    公开(公告)日：2004-05-11

    申请号：US09923441

    申请日：2001-08-08

    申请人： Yasushi Takai ,  Toshihiko Tsukatani

    发明人： Yasushi Takai ,  Toshihiko Tsukatani

    IPC分类号： B32B516

    CPC分类号： C01F17/0043 ,  C01P2002/60 ,  C01P2004/61 ,  C01P2006/12 ,  C01P2006/60 ,  C01P2006/80 ,  C04B35/50 ,  Y10T428/2982

    摘要： The invention discloses a method for the preparation of a rare earth hydroxide powder in which, different from the conventional wet-process hydroxide precipitation method in an aqueous solution of a rare earth salt by the addition of an alkali, a powder of a rare earth oxide is brought into contact with a limited amount of water in the form of either liquid or vapor and kept in contact with water at a temperature of 30 to 200° C. The thus prepared rare earth hydroxide powder is characterized by a small crystallite diameter not exceeding 40 nm and outstandingly low contents of impurity chlorine and nitrate ions originating in the starting rare earth salt in the hydroxide prepared by the conventional wet-process method. The inventive rare earth hydroxide powder is advantageous as a component ingredient or as an adjuvant in the ceramic compositions for the preparation of a sintered dielectric ceramic bodies in respects of the greater dielectric constant and smaller temperature dependency of the dielectric constant than similar ceramic bodies prepared from a conventional rare earth hydroxide or oxide.

    摘要翻译： 本发明公开了一种制备稀土氢氧化物粉末的方法，其中不同于常规湿法氢氧化物沉淀法，在稀土盐水溶液中加入碱，稀土氧化物粉末 与液体或蒸气形式的有限量的水接触，并在30至200℃的温度下与水接触。由此制备的稀土氢氧化物粉末的特征在于微晶直径不超过 40nm，并且通过常规湿法制备的氢氧化物中源自起始稀土盐的杂质氯和硝酸根离子的含量显着低。 本发明的稀土氢氧化物粉末作为陶瓷组合物中的组分成分或佐剂是有利的，所述陶瓷组合物用于制备烧结介电陶瓷体的介电常数和介电常数的较小的温度依赖性比由 常规稀土氢氧化物或氧化物。