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Method of Making Nd-Fe-B Magnetic Materials with Reduced Heavy Rare Earth Metals

A magnetic material and weight technology, applied in the direction of magnetic materials, magnetic objects, metal processing equipment, etc., can solve expensive and other problems

Inactive Publication Date: 2016-03-09
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If even higher magnetism is required then Tb is required which is much more expensive than Dy

Method used

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  • Method of Making Nd-Fe-B Magnetic Materials with Reduced Heavy Rare Earth Metals
  • Method of Making Nd-Fe-B Magnetic Materials with Reduced Heavy Rare Earth Metals
  • Method of Making Nd-Fe-B Magnetic Materials with Reduced Heavy Rare Earth Metals

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Embodiment Construction

[0052] Reference will now be made in detail to compositions, embodiments and methods of this invention, which constitute the best modes of carrying out the invention presently known to the inventors. The drawings are not necessarily drawn to scale. It is to be understood, however, that the disclosed embodiments are merely exemplary of the invention, which may be embodied in different and alternative forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for any aspect of the invention and / or as a representative basis for teaching one skilled in the art to variously employ the invention . It is also to be understood that this invention is not limited to the specific embodiments and methods described below, as specific components and / or conditions may, of course, vary. Furthermore, the terminology used herein is for the purpose of describing particular embodiments of the invention only and is not intended...

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Abstract

A method of making a magnetic material includes a step of providing a first material in the form of a core powder containing Nd, Fe and B. The first material is combined with the second material to form a powder combination. The second material includes a component selected from the group consisting of Dy, Tb, and combinations thereof. The powder combination is encapsulated to form an encapsulated powder combination. A magnetic field is applied to the powder combination during encapsulation and thereafter to align the magnetic dipoles therein. The encapsulated powder combination is isostatically pressed with heat to form the magnetic material.

Description

technical field [0001] In at least one aspect, the present invention relates generally to electric motors and their manufacture, and more particularly to methods for forming permanent magnets using rare earth (RE) elements for improving the power density of electric motors (compared to induction motors) etc.), especially the use of heavy rare earth elements such as Dy and Tb for improving high temperature magnetic properties. Background technique [0002] Permanent magnets are used in various fields such as microelectronics, automobiles, medical devices, power generation, and the like. Permanent magnets are typically formed from hard magnetic materials, which also find applications in the automotive, aerospace and telecommunications industries. Rare earth magnets such as Nd-Fe-B have a higher energy density than most other hard magnets. Additionally, such magnets are used in automotive applications such as starters, small motors, alternators, sensors, instrumentation, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057B22F3/16B22F1/17
CPCB22F2003/247B22F2998/10B22F2999/00C22C2202/02H01F41/0273H01F1/0577B22F3/15B22F2003/248Y02P10/25B22F1/17B22F10/28B22F10/64B22F2202/05B22F2203/11B22F2009/043
Inventor Y·王
Owner GM GLOBAL TECH OPERATIONS LLC
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