Title: Rare earth alloy powder and process for producing the same
Application Number: 85109738 Application Date: 1985.11.26
Publication Number: 1002424 Publication Date: 1986.08.20
Approval Pub. Date: 1992.09.23 Granted Pub. Date: 1992.09.23
International Classifi-cation: B22F9/20;H01F1/053
Applicant(s) Name: Sumitomo Special Metal Corp. Address:
Inventor(s) Name: Naoyuki Ishigaki
Attorney & Agent: QUAN JING WU DAJIAN
Abstract:
    A rare earth-iron-boron alloy powder which consists essentially of: 12.5 to 20 at % R wherein R1 is 0.05 to 5 at %, 4 to 20 at % B, and 60 to 83.5 at % Fe, wherein R1 is at least one heavy rare earth element selected from the group consisting of Gd, Tb, Dy, Ho, Er, Tm, and Yb, 80 to 100 at % of R2 consists of Nd and/or Pr, the balance in the R2 being at least one element selected from the group consisting of rare earth elements including Y and except for R1, and R=R1 R2 by atomic %, wherein a major phase of at least 80 vol % of the entire alloy coinsists of a tetragonal structure, and wherein oxygen does not exceed 10,000 ppm, carbon does not exceed 1000 ppm and calcium does not exceed 2000 ppm. Up to 35 at % Co may be substituted for Fe.
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