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Title:
R-FE-B PERMANENT MAGNET MATERIAL
Document Type and Number:
Japanese Patent JPH0745412
Kind Code:
A
Abstract:

PURPOSE: To enable effective fine grinding and to acquire good oxidation resistance by containing R2Fe14B and specifying average grain diameter, apparent density, orientation degree and magnetic characteristic.

CONSTITUTION: A casting piece of fine and uniform structure is manufactured, which is comprised of R (R is at least one kind of rare earth elements including Y) of 12 to 16 atomic %, B of 4 to 8 atomic %, O3 of 5000ppm or less and a remaining part of Fe (Fe is partially displaced with one or two kinds of Ni) and inevitable impurities and contains a main phase of R2Fe14B of 90% or more. After the casting piece is hydrogen occluded, fine powder 7 which is obtained by finely grinding alloy powder stabilized by de-H2 treatment is orientated by a pulse coil 6 to realize average grain diameter of 10μm or less, apparent density of 7.45g/cm3 or more and orientation degree of 85% or more. Thereafter, it is molded and sintered to acquire a total of (BH)max value and iHc value of 59 or more and angularity {(Br2/4)/(BH)max} of 1.01 to 1.045.


Inventors:
KANEKO YUJI (JP)
ISHIGAKI NAOYUKI (JP)
TOKUHARA KOKI (JP)
Application Number:
JP1993000207192
Publication Date:
February 14, 1995
Filing Date:
July 28, 1993
Export Citation:
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Assignee:
SUMITOMO SPEC METALS (JP)
International Classes:
B22F9/04; C22C38/00; H01F1/053; H01F1/057; (IPC1-7): H01F1/053; B22F9/04; C22C38/00
Attorney, Agent or Firm:
押田 良久