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Patent Searching and Data


Title:
METHOD FOR MANUFACTURING R-T-B-BASED SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2018/180891
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a R-T-B-based sintered magnet, the method comprising: a step for preparing an additive alloy powder containing 3.5-8.5 mass% of Co, 0.2-0.8 mass% of B, 33-69 mass% of R, 10-60 mass% of T, 0.8-3 mass% of Cu, and 1.8-10 mass% of Ga, and satisfying equation (1) below; a step for preparing a main alloy powder containing 0.91-1.1 mass% of B, 28.5-33 mass% of R, 64-70 mass% of T, and 0.1-0.4 mass% of Ga; a step for preparing a mixed-alloy powder containing 1-16 mass% of the additive alloy powder and 82-99 mass% of the main alloy powder; a step for molding the mixed-alloy powder to obtain a molded body; a step for sintering the molded body to obtain a sintered body; and a step for heat-treating the sintered body. (1) 14×[B]/10.8≤[T]/55.85≤14×[B]/10.8×2, [B] and [T] are the contents (mass%) of B and T in the additive alloy powder.

Inventors:
ISHII RINTARO (JP)
SATOH TEPPEI (JP)
KUNIYOSHI FUTOSHI (JP)
Application Number:
PCT/JP2018/011416
Publication Date:
October 04, 2018
Filing Date:
March 22, 2018
Export Citation:
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Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; B22F1/00; B22F3/00; C22C38/00; H01F1/057
Foreign References:
JP2017017121A2017-01-19
JP6090550B12017-03-08
JP2016184689A2016-10-20
JP2016086078A2016-05-19
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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