公开(公告)号：US20150171717A1

公开(公告)日：2015-06-18

申请号：US14109097

申请日：2013-12-17

Applicant: GM Global Technology Operations LLC

Inventor： Shekhar G. Wakade ,  Frederick E. Pinkerton

IPC: H02K15/03 ,  H01F41/02 ,  H01F1/057 ,  B22F3/12 ,  B22F5/00

CPC classification number: H02K15/03 ,  B22F3/1007 ,  B22F3/225 ,  B22F2999/00 ,  H01F1/0577 ,  H01F41/0273 ,  Y10T29/49012 ,  B22F2202/05

Abstract: A method of making a permanent magnet and a permanent magnet. The method includes using metal injection molding to mix a magnetic material with a binder into a common feedstock and injection mold the feedstock into a predetermined magnet shape. The injection molding of the feedstock takes place in conjunction with the application of a magnetic field such that at least some of the magnetic constituents in the feedstock are aligned with the applied field. After the alignment of the magnetic constituents, the shaped part may be sintered. In one form, the magnetic constituents may be made from a neodymium-iron-boron permanent magnet precursor material, as well as one or more rare earth ingredients.

Abstract translation: 一种制造永磁体和永磁体的方法。 该方法包括使用金属注射成型将磁性材料与粘合剂混合到共同的原料中并将原料注射成预定的磁体形状。 原料的注射成型与施加磁场一起进行，使得原料中的至少一些磁性组分与施加的磁场对准。 在磁性成分对准之后，成形部件可以烧结。 在一种形式中，磁性成分可以由钕 - 铁 - 硼永磁体前体材料以及一种或多种稀土成分制成。

公开(公告)号：US09870862B2

公开(公告)日：2018-01-16

申请号：US13868468

申请日：2013-04-23

Applicant: GM Global Technology Operations LLC

Inventor： Shekhar G. Wakade ,  Yucong Wang ,  Edward P. Becker

IPC: H01F41/02

CPC classification number: H01F41/0246 ,  H01F41/0266

Abstract: A number of variations may include a method including providing a first powder comprising iron; compacting the first powder into a compacted powder product having a non-planar surface, wherein the compacting includes dynamic magnetic compaction or combustion driven compaction; and increasing the magnetic coercivity of at least one of the first powder or compact powder product.

公开(公告)号：US20140314611A1

公开(公告)日：2014-10-23

申请号：US13868468

申请日：2013-04-23

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Shekhar G. Wakade ,  Yucong Wang ,  Edward P. Becker

IPC: H01F41/02

CPC classification number: H01F41/0246 ,  H01F41/0266

Abstract: A number of variations may include a method including providing a first powder comprising iron; compacting the first powder into a compacted powder product having a non-planar surface, wherein the compacting includes dynamic magnetic compaction or combustion driven compaction; and increasing the magnetic coercivity of at least one of the first powder or compact powder product.

Abstract translation: 许多变型可以包括提供包含铁的第一粉末的方法; 将第一粉末压实成具有非平面表面的压实粉末产品，其中压实包括动态磁性压实或燃烧驱动的压实; 以及增加所述第一粉末或致密粉末产品中的至少一种的磁矫顽力。

公开(公告)号：US20170283899A1

公开(公告)日：2017-10-05

申请号：US15398155

申请日：2017-01-04

Applicant: GM Global Technology Operations LLC

Inventor： Huaxin Li ,  Shekhar G. Wakade

IPC: C21D9/32 ,  C23C8/32 ,  C21D6/00 ,  C21D9/30 ,  C21D1/20 ,  C21D1/613 ,  C23C8/22 ,  C23C8/80

CPC classification number: C21D9/32 ,  C21D1/20 ,  C21D1/613 ,  C21D6/00 ,  C21D9/30 ,  C23C8/22 ,  C23C8/32 ,  C23C8/80

Abstract: A novel combination of heat treatment steps includes the steps of carburizing a component fabricated of a medium carbon alloy steel at an elevated temperature for between three and six hours, subjecting the component to an austempering bath and holding it there for between fifteen and two hundred forty minutes and finally cooling the component to room temperature to allow martensitic transformation. These steps may be followed with cryogenic treatment to reduce retained austenite if needed. The process produces components with low distortion, high surface hardness, from HRC 56 to 62, and high surface compressive residual stress.