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1. (WO2018180891) METHOD FOR MANUFACTURING R-T-B-BASED SINTERED MAGNET

Pub. No.:    WO/2018/180891    International Application No.:    PCT/JP2018/011416
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 23 00:59:59 CET 2018
IPC: H01F 41/02
B22F 1/00
B22F 3/00
C22C 38/00
H01F 1/057
Applicants: HITACHI METALS, LTD.
日立金属株式会社
Inventors: ISHII, Rintaro
石井 倫太郎
SATOH, Teppei
佐藤 鉄兵
KUNIYOSHI, Futoshi
國吉 太
Title: METHOD FOR MANUFACTURING R-T-B-BASED SINTERED MAGNET
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.