公开(公告)号：US11232903B2

公开(公告)日：2022-01-25

申请号：US16139952

申请日：2018-09-24

Applicant: Ford Global Technologies, LLC

Inventor： Wanfeng Li ,  Feng Liang ,  Michael W. Degner

IPC: H01F41/02 ,  B22F10/20 ,  B22F10/28 ,  B22F10/30 ,  H01F7/02 ,  H01F1/053 ,  C22C38/00

Abstract: A method includes depositing a layer of alloy particles including rare earth permanent magnet phase above a substrate, laser scanning the layer while cooling the substrate to melt the particles, selectively initiate crystal nucleation, and promote columnar grain growth in a same direction as an easy axis of the rare earth permanent magnet phase. The method also includes repeating the depositing and scanning to form bulk anisotropic rare earth alloy magnet with aligned columnar grains.

公开(公告)号：US11004600B2

公开(公告)日：2021-05-11

申请号：US16012411

申请日：2018-06-19

Applicant: FORD GLOBAL TECHNOLOGIES, LLC

Inventor： Wanfeng Li ,  Feng Liang ,  Michael W. Degner

IPC: H01F41/02 ,  H01F1/057 ,  H01F7/02 ,  C21D1/04 ,  C30B30/04 ,  C30B33/04 ,  C21D6/00

Abstract: A method includes mixing first and second alloys to form a mixture, pressing the mixture within a first magnetic field to form a magnet having anisotropic particles of the first alloy aligned with a magnetic moment of the magnet, and heat treating the magnet within a second magnetic field to form elongated grains from the second alloy and align the elongated grains with the moment.

公开(公告)号：US20200094321A1

公开(公告)日：2020-03-26

申请号：US16139952

申请日：2018-09-24

Applicant: Ford Global Technologies, LLC

Inventor： Wanfeng Li ,  Feng Liang ,  Michael W. Degner

IPC: B22F3/105

Abstract: A method includes depositing a layer of alloy particles including rare earth permanent magnet phase above a substrate, laser scanning the layer while cooling the substrate to melt the particles, selectively initiate crystal nucleation, and promote columnar grain growth in a same direction as an easy axis of the rare earth permanent magnet phase. The method also includes repeating the depositing and scanning to form bulk anisotropic rare earth alloy magnet with aligned columnar grains.

公开(公告)号：US10079084B1

公开(公告)日：2018-09-18

申请号：US14534758

申请日：2014-11-06

Applicant: Ford Global Technologies, LLC

Inventor： Wanfeng Li

IPC: B22F3/12 ,  H01F1/057 ,  B22F3/24

Abstract: Magnets and methods of making the magnets are disclosed. The magnets may have high coercivity and may be suitable for high temperature applications. The magnet may include a plurality of grains of a Nd—Fe—B alloy having a mean grain size of 100 to 500 nm. The magnet may also comprise a non-magnetic low melting point (LMP) alloy, which may include a rare earth element and one or more of Cu, Ga, and Al. The magnets may be formed from a Nd—Fe—B alloy powder produced using HDDR and jet milling, or other pulverization process. The powder may have a refined grain size and a small particle size and particle size distribution. The LMP alloy may be mixed with a powder of the Nd—Fe—B alloy or it may be diffused into a consolidated Nd—Fe—B bulk magnet. The LMP alloy may be concentrated at the grain boundaries of the bulk magnet.