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    Method for preparing NdFeB magnets including lanthanum or cerium
    5.
    发明申请
    Method for preparing NdFeB magnets including lanthanum or cerium 有权

    公开(公告)号：US20230093584A1

    公开(公告)日：2023-03-23

    申请号：US17946046

    申请日：2022-09-16

    申请人： Yantai Dongxing Magnetic Materials Inc.

    发明人： Xiulei CHEN ,  Zhongjie PENG ,  Zhanji DONG ,  Kaihong DING

    IPC分类号： H01F1/057 ,  H01F41/02 ,  B22F1/14 ,  C22C38/00 ,  B22F3/24 ,  B22F1/05

    摘要： The disclosure refers to a method for preparing NdFeB magnets including at least one of Ce and La. The method includes:
    S1) Separately preparing flakes of alloy R1 and flakes of alloy R2 each by a strip casting process, wherein the alloy R1 includes at least one of La and Ce, but the alloy R2 does not include La and Ce; S2) separately subjecting the flakes of alloy R1 and R2 to a hydrogen embrittlement process followed by pulverizing the process product to alloy powders by jet milling, wherein a ratio of the average particle sizes D50 of the powder of alloy R1 and R2 satisfied formula: 0.32≤R2/R1≤0.66; S3) mixing the powder of alloy R1 and R2; and S4) subjecting the mixed powders to molding and magnetic field orientation, cold isostatic pressing, sintering, and an annealing process.

    FINE PARTICLE PRODUCTION DEVICE AND FINE PARTICLE PRODUCTION METHOD
    6.
    发明申请
    FINE PARTICLE PRODUCTION DEVICE AND FINE PARTICLE PRODUCTION METHOD 有权

    公开(公告)号：US20220402029A1

    公开(公告)日：2022-12-22

    申请号：US17777196

    申请日：2020-11-10

    申请人： NISSHIN ENGINEERING INC.

    发明人： Shu WATANABE ,  Shiori SUEYASU ,  Keitaro NAKAMURA

    IPC分类号： B22F9/08 ,  C09C3/08 ,  C09C1/62 ,  B22F1/14

    摘要： Provided is a fine particle production apparatus and a fine particle production method capable of easily obtaining surface treated fine particles. The fine particle production apparatus produces fine particles using feedstock by means of a gas-phase process. The apparatus includes a treatment section configured to transform the feedstock into a mixture in a gas phase state by means of the gas-phase process, a feedstock supply section configured to supply the feedstock to the treatment section, a cooling section configured to cool the mixture in a gas phase state in the treatment section using a quenching gas containing an inert gas, and a supply section configured to supply a surface treating agent to fine particle bodies in a temperature region in which the surface treating agent is not denatured, the fine particle bodies being produced by cooling the mixture in the gas phase state with the quenching gas.

    METHODS FOR IN SITU FORMATION OF DISPERSOIDS STRENGTHENED REFRACTORY ALLOY IN 3D PRINTING AND ADDITIVE MANUFACTURING
    8.
    发明公开
    METHODS FOR IN SITU FORMATION OF DISPERSOIDS STRENGTHENED REFRACTORY ALLOY IN 3D PRINTING AND ADDITIVE MANUFACTURING 审中-公开

    公开(公告)号：US20240269745A1

    公开(公告)日：2024-08-15

    申请号：US18438949

    申请日：2024-02-12

    申请人： Addman Intermediate Holdings, LLC

    发明人： Youping Gao

    IPC分类号： B22F10/28 ,  B22F1/14 ,  B22F10/50 ,  B33Y10/00 ,  B33Y80/00

    CPC分类号： B22F10/28 ,  B22F1/14 ,  B22F10/50 ,  B22F2201/02 ,  B22F2201/03 ,  B22F2201/10 ,  B22F2301/20 ,  B22F2304/10 ,  B33Y10/00 ,  B33Y80/00

    摘要： Methods of fabricating objects using additive manufacturing are provided using pretreated powders. In a first aspect, the methods create in situ dispersoids within the object to increase the oxygen content to between 500 ppm and 3000 ppm or to increase the nitrogen content to between 250 ppm and 1500 ppm. The pretreated powders are then formed into layers in an environmentally controlled chamber of an additive manufacturing machine. The quantity of refractory alloy powder is partially pretreated by exposure to the atmosphere for a selected period of time or in an inert atmosphere having oxygen and/or nitrogen introduced thereinto. The partially pretreated quantity of powder is then further pretreated in an inert atmosphere controlled chamber to raise the oxygen and/or nitrogen level to between about 250 ppm and 1000 ppm for nitrogen and between about 500 ppm and 2000 ppm for oxygen. The layers of pretreated powder are then exposed to a transient moving energy source or stationary energy source for melting and solidifying the layers; and creating in situ dispersoids in the layers. In a second aspect, carbon dioxide is introduced into an inert atmosphere controlled chamber having hafnium powder therein for creating hafnium carbide dispersoids throughout the object.