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    DUST CORE AND INDUCTOR ELEMENT
    2.
    发明申请
    DUST CORE AND INDUCTOR ELEMENT 审中-公开

    公开(公告)号：US20190189319A1

    公开(公告)日：2019-06-20

    申请号：US16197996

    申请日：2018-11-21

    申请人： TDK CORPORATION

    发明人： Hideharu MORO ,  Akihiro HARADA ,  Yu YONEZAWA

    IPC分类号： H01F1/24 ,  B22F1/00 ,  H01F27/255

    CPC分类号： H01F1/24 ,  B22F1/0014 ,  B22F2301/15 ,  B22F2301/20 ,  B22F2301/35 ,  B22F2304/10 ,  H01F27/255

    摘要： To provide a dust core excellent in DC superimposition characteristics and low in eddy current loss at a high frequency band of several MHz, and an inductor element using the dust core. A dust core contains large particles and small particles of insulated soft magnetic material powder, wherein the large particles and the small particles have a saturation magnetic flux density of 1.4 T or more, and wherein in the soft magnetic material powder observed in a cross section of the dust core, a ratio of an area occupied by the large particles to an area occupied by the small particles in the cross section is 9:1 to 5:5, when a group of particles having a particle size of 3 μm or more and 15 μm or less is defined as the large particles, and a group of particles having a particle size of 300 nm or more and 900 nm or less is defined as the small particles.

    A PREPARATION METHOD OF RARE EARTH OXIDE DISPERSION STRENGTHENED FINE GRAIN TUNGSTEN MATERIALS
    9.
    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

    申请人： CENTRAL SOUTH UNIVERSITY

    发明人： JINGLIAN FAN ,  YONG HAN

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

    CPC分类号： 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

    摘要： 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.