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    • 5. 发明授权
    • Method for preparing nickel fine powder
    • 镍微粉制备方法
    • US6120576A
    • 2000-09-19
    • US112361
    • 1998-07-09
    • Yoshiharu ToshimaTakayuki ArakiTakao HayashiHiroyuki Shimamura
    • Yoshiharu ToshimaTakayuki ArakiTakao HayashiHiroyuki Shimamura
    • B22F1/00B22F9/24
    • C22B23/0453B22F1/0014B22F9/24B22F2998/00
    • A method for preparing nickel fine powder is herein disclosed, which comprises the steps of mixing an aqueous sodium hydroxide solution comprising, on the basis of the total weight of the sodium hydroxide present in the aqueous solution, 75 to 85% by weight of liquid caustic soda as specified in JIS K 1203 and 25 to 15% by weight, in total, of at least one of sodium hydroxide as specified in JIS K 8576 and solid caustic soda as specified in JIS K 1202, with an aqueous solution of nickel sulfate to form nickel hydroxide, then reducing the resulting nickel hydroxide with hydrazine and recovering nickel fine powder produced. The nickel fine powder prepared by the method has an average particle size of the primary particles ranging from 0.1 to 0.9 .mu.m, a D.sub.90 value of not more than 2.1 .mu.m and a tap density of not less than 3.5 g/cc. The nickel fine powder has a low degree of aggregation, a narrow particle size distribution and a high tap density and therefore, the powder is quite suitably used as a material for producing an internal electrode for a laminated ceramic condenser.
    • 本文公开了一种制备镍微粉的方法,其包括以下步骤:将氢氧化钠水溶液混合,所述氢氧化钠水溶液基于存在于水溶液中的氢氧化钠的总重量为75至85重量%的液体苛性碱 按照JIS K 1203中规定的苏打水,以及JIS-8576中规定的氢氧化钠中的至少一种和JIS K 1202中规定的固体苛性钠中的至少一种的25〜15重量%的硫酸镍水溶液 形成氢氧化镍,然后用肼还原所得的氢氧化镍并回收生产的镍细粉。 通过该方法制备的镍微粉末,其一次粒子的平均粒径为0.1〜0.9μm,D90值不大于2.1μm,振实密度为3.5g / cc以上。 镍微粉末具有低聚集度,窄粒度分布和高振实密度,因此该粉末非常适合用作制备用于层压陶瓷冷凝器的内部电极的材料。
    • 6. 发明申请
    • Flaky Copper Powder, Method For Producing The Same, And Conductive Paste
    • 片状铜粉,生产方法和导电膏
    • US20070209475A1
    • 2007-09-13
    • US11587976
    • 2005-04-26
    • Takahiko SakaueKatsuhiko YoshimaruYoshinobu NakamuraHiroyuki Shimamura
    • Takahiko SakaueKatsuhiko YoshimaruYoshinobu NakamuraHiroyuki Shimamura
    • B22F9/24
    • B22F1/0014B22F1/0044B22F1/0055B22F1/0062B22F9/24B22F2001/0033H01B1/22H05K1/095
    • It is an object of the present invention to provide a flaky copper powder composed of fine particles having a sharp distribution particle size, a large crystallite diameter and high oxidation resistance. The flaky copper powder of the present invention contains P and has a crystallite diameter/D1A ratio of 0.01 or more to achieve the object. The method for producing the flaky copper powder comprises four steps: a first step of preparing an aqueous solution containing a copper salt and complexing agent; a second step of adding an alkali hydroxide to the aqueous solution to prepare a first slurry containing cupric oxide; a third step of adding a first reducing agent which can reduce the cupric oxide into cuprous oxide to the first slurry to prepare a second slurry containing cuprous oxide; and a fourth step of adding a second reducing agent which can reduce the cuprous oxide into copper to the second slurry to provide a flaky copper powder, wherein phosphoric acid and its salt are added in at least one of the first to third steps and/or in the second slurry in the fourth step.
    • 本发明的目的是提供一种由具有尖锐分布粒度,大晶粒直径和高抗氧化性的细颗粒组成的片状铜粉末。 本发明的片状铜粉含有P,并且具有0.01以上的微晶直径/ D 1A%比以达到目的。 片状铜粉的制造方法包括四个步骤:制备含有铜盐和络合剂的水溶液的第一步骤; 向该水溶液中添加碱性氢氧化物以制备含有氧化铜的第一浆料的第二步骤; 第三步骤,将第一还原剂加入到第一浆料中以制备含有氧化亚铜的第二浆料; 以及第四步骤,添加第二还原剂,其可以将氧化亚铜还原成铜到第二浆料中以提供片状铜粉末,其中在第一至第三步骤中的至少一个中加入磷酸及其盐,和/或 在第四步中的第二浆料中。
    • 7. 发明申请
    • Electro Conductive Tin Oxide Powder and Method for Producing the Same
    • 导电氧化锡粉及其制造方法
    • US20070295938A1
    • 2007-12-27
    • US10588650
    • 2005-02-04
    • Hiroshi FujiiKoichi KawarayaKatsuhiko YoshimaruHiroyuki Shimamura
    • Hiroshi FujiiKoichi KawarayaKatsuhiko YoshimaruHiroyuki Shimamura
    • H01B1/12
    • C08L101/12C01G19/02C01P2006/40C09D5/24
    • An object of the present invention is to provide an electro conductive tin oxide powder which is free from toxic dopant, e.g., antimony, which can provide excellent conductivity to a polymer, and easy to disperse in a paint and the conductive film formed shows excellent transparency; and also provide the method for producing an electro conductive tin oxide powder. In order to achieve the above objects, the present invention disclose the electro conductive tin oxide powder which is characterized in that it is free from a dopant and the paint prepared with it gives conductive film which shows a Haze value of 5% or less and surface resistance of 1010Ω/ or less. The electro conductive tin oxide powder is produced by the method which is characterized in that steps for production are, adding a sodium stannate solution slowly into an aqueous acid solution till the solution pH goes down to 5 or under; followed by rinsing, followed by filtering and drying the resulting slurry and milling of the resulting dry powder and calcining of the milled powder in a non-oxidizing atmosphere.
    • 本发明的目的是提供一种不含有毒的掺杂剂的导电氧化锡粉末,例如锑,其可以为聚合物提供优异的导电性,并且易于分散在涂料中,并且所形成的导电膜显示出优异的透明度 ; 并且还提供了制造导电氧化锡粉末的方法。 为了实现上述目的,本发明公开了一种导电性氧化锡粉末,其特征在于,其不含掺杂剂,并且用其制备的涂料产生显示5%或更低的雾度值的导电膜和表面 电阻为10 10Ω/或更小。 通过以下方法制造导电氧化锡粉末,其特征在于,生产步骤是将酸式钠溶液缓慢加入到酸性水溶液中直到溶液pH降至5或更低; 然后冲洗,然后过滤并干燥所得浆料并研磨所得干粉,并在非氧化气氛中煅烧研磨的粉末。