Invention Grant
- Patent Title: Method of making Nd-Fe-B sintered magnets with Dy or Tb
- Patent Title (中): 用Dy或Tb制造Nd-Fe-B烧结磁体的方法
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Application No.: US13007203Application Date: 2011-01-14
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Publication No.: US08480815B2Publication Date: 2013-07-09
- Inventor: Yucong Wang
- Applicant: Yucong Wang
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Agency: Dinsmore & Shohl LLP
- Main IPC: H01F1/03
- IPC: H01F1/03 ; H01F7/02 ; B22F1/00 ; B22F3/24

Abstract:
A method of making a permanent magnet is described. In one embodiment, the method includes providing a first alloy powder having a desired composition, the alloy powder containing neodymium, iron, and boron; coating the first alloy powder with dysprosium, dysprosium alloy, terbium, or terbium alloy so that the first alloy powder has a surface concentration of dysprosium, terbium, or both in excess of a bulk concentration of dysprosium, terbium, or both; and forming the permanent magnet from the coated alloy powder using a powder metallurgy process, the permanent magnet having a non-uniform distribution of dysprosium, terbium, or both therein. Permanent magnets are also described.
Public/Granted literature
- US20120182102A1 METHOD OF MAKING ND-FE-B SINTERED MAGNETS WITH DY OR TB Public/Granted day:2012-07-19
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