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    A PREPARATION METHOD OF RARE EARTH OXIDE DISPERSION STRENGTHENED FINE GRAIN TUNGSTEN MATERIALS
    334.
    发明申请
    A PREPARATION METHOD OF RARE EARTH OXIDE DISPERSION STRENGTHENED FINE GRAIN TUNGSTEN MATERIALS 审中-公开

    公开(公告)号：US20170225234A1

    公开(公告)日：2017-08-10

    申请号：US14901780

    申请日：2014-10-20

    Applicant: CENTRAL SOUTH UNIVERSITY

    Inventor： JINGLIAN FAN ,  YONG HAN

    IPC: B22F9/30 ,  B22F1/00 ,  B22F9/22 ,  B22F3/16 ,  B22F3/04

    CPC classification number: B22F9/30 ,  B22F1/0003 ,  B22F1/0018 ,  B22F3/04 ,  B22F3/16 ,  B22F9/22 ,  B22F2301/20 ,  B22F2302/25 ,  B22F2998/10 ,  B22F2999/00 ,  C22C1/045 ,  C22C1/1026 ,  C22C27/04 ,  C22C32/0031 ,  C22C2200/04 ,  B22F1/0088 ,  B22F2201/013 ,  B22F1/02 ,  B22F9/026 ,  B22F1/0085 ,  B22F3/02 ,  B22F3/10 ,  B22F9/24

    Abstract: This invention relates to a preparation method of rare earth oxide dispersion strengthened fee grain tungsten materials, the mass percent of the rare earth oxide is of 0.1-2%, and the rest ingredient is W. Weigh soluble rare earth salt and tungstate, dissolve into water to made into 50-100 g/L of rare earth salt solution and 150-300 g/L of tungstate solution, respectively. Firstly, add trace alkali in rare earth salt solution to control pH in 7-8, then add organic dispersant and stir to form evenly suspended R(OH)3 particle colloid (R refers to rare earth element). Secondly pour the tungstate solution into the R(OH)3colloid, add trace acid to control pH in 6-7, then add organic dispersant and stir to form tungstic acid micro particles, which wrap around the colloidal particles, forming coprecipitation coating particle colloid. Thirdly, the coprecipitation coating particle colloidal is spray-dried, forming tungsten and rare earth oxide compound precursor powder. Alter that, ultrafine or nanoscale tungsten powder with particle size of 50˜500 nm is obtained through a process of calcination subsequent with hydrogen thermal reduction. Finally, the tungsten powder is subjected to ordinary compression molding and then conventional high temperature sintering. The trace rare earth oxide dispersion strengthened high performance fine grain tungsten materials prepared by this invention, its density is close to full density (98.5% or higher), its grain size is uniform and very fine (average in 5˜10 microns), and the rare earth oxides particles evenly distribute in tungsten intracrystalline or grain, boundary with particle size of 100˜500 nm.

    METHOD FOR PRODUCING NICKEL POWDER
    338.
    发明申请
    METHOD FOR PRODUCING NICKEL POWDER 审中-公开
    生产镍粉的方法

    公开(公告)号：US20160354844A1

    公开(公告)日：2016-12-08

    申请号：US15117855

    申请日：2015-02-17

    Applicant: KOCHI UNIVERSITY, NATIONAL UNIVERSITY CORPORATION ,  SUMITOMO METAL MINING CO., LTD.

    Inventor： Kazumichi Yanagisawa ,  Junhao Zhang ,  Shin-ichi Heguri ,  Yoshitomo Ozaki ,  Kazuyuki Takaishi ,  Hideki Ohara ,  Tomoaki Yoneyama ,  Osamu Ikeda ,  Yohei Kudo

    IPC: B22F9/24

    CPC classification number: B22F9/24 ,  B22F9/26 ,  B22F2009/245 ,  B22F2301/15 ,  B22F2998/10 ,  B22F2999/00 ,  B22F2201/013

    Abstract: Provided is a method for producing fine nickel powder used as suitable seed crystals for producing nickel powder from a solution containing a nickel ammine sulfate complex. The method for producing nickel powder sequentially includes: a mixing step of adding, to a solution containing a nickel ammine sulfate complex, a dispersant containing a sulfonate and an insoluble solid which is insoluble in the solution to form a mixed slurry; a reduction and precipitation step of charging a reaction vessel with the mixed slurry and then blowing hydrogen gas into the mixed slurry in the reaction vessel to reduce nickel complex ions contained in the mixed slurry to form nickel precipitate on a surface of the insoluble solid; and a separation step of separating the nickel precipitate on the surface of the insoluble solid from the surface of the insoluble solid to form nickel powder.

    Abstract translation: 本发明提供一种从含有硫酸镍络合物的溶液中制造用于生产镍粉的合适晶种的细镍粉的方法。 依次制备镍粉的方法包括：向含有硫酸镍络合物的溶液中加入不溶于所述溶液以形成混合浆料的含有磺酸盐和不溶性固体的分散剂的混合步骤; 还原沉淀步骤，将反应容器装入混合浆料中，然后将氢气吹入反应容器中的混合浆液中以还原混合浆料中的镍络合物离子，以在不溶性固体的表面上形成镍沉淀物; 以及从不溶性固体的表面分离不溶性固体的表面上的镍沉淀物以形成镍粉末的分离步骤。

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