Rare-earth sintered magnet and method of producing the same

Details Rare-earth sintered magnet and method of producing the same Rare-earth sintered magnet and method of producing the same

2006-05-23

2006-05-23

Sheehan, John (Department: 1742)

Metal treatment

Stock

Magnetic

C148S101000, C075S232000, C075S244000, C075S246000, C419S012000, C419S045000, C419S046000

Reexamination Certificate

active

07048808

ABSTRACT:
The present invention provides a rare-earth sintered magnet exhibiting desirable magnetic properties in which the amount of Nd and/or Pr forming a non-magnetic phase in a grain boundary phase is reduced. Specifically, the present invention provides a rare-earth sintered magnet having a composition of (R1x+R2y)T100-x-y-zQzwhere R1 is at least one element selected from the group consisting of all rare-earth elements excluding La (lanthanum), Y (yttrium) and Sc (scandium); R2 is at least one element selected from the group consisting of La, Y and Sc; T is at least one element selected from the group consisting of all transition elements; Q is at least one element selected from the group consisting of B and C, and including, as a main phase, a crystal grain of an Nd2Fe14B crystalline structure, wherein: molar fractions x, y and z satisfy 8≦x≦18 at %, 0.1≦y≦3.5 at % and 3≦z≦20 at %, respectively; and a concentration of R2 is higher in at least a part of a grain boundary phase than in the main phase crystal grains.

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M.G. Benz et al., “High-Energy-Product (Pr-Nd-Ce) FeB Magnets Produced DIrectly from Mixed-Rare-Earth-Oxide Feed for MRI Medical Imaging Applications”, pp. 1-11 (plus Technical Report Abstract Page), Jun. 2000, GE Research & Development Center, 2000CRD061, Class 1.
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