Title:
IRON BASE RARE EARTH BORON-BASED ISOTROPIC NANOCOMPOSITE MAGNET ALLOY, METHOD FOR PRODUCING IRON BASE RARE EARTH BORON-BASED ISOTROPIC NANOCOMPOSITE MAGNET ALLOY, AND METHOD FOR PRODUCING RESIN-BONDED PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2024/057653
Kind Code:
A1
Abstract:
The present invention provides an iron base rare earth boron-based isotropic nanocomposite magnet alloy which has an alloy composition that has a composition which is represented by the composition formula T100-x-y-z(B1-nCn)xREyZrzMm (wherein: T represents one or more transition metal elements that are selected from the group consisting of Fe, Co and Ni, and necessarily includes Fe; RE represents one or more rare earth elements that are selected from among Nd and Pr, and necessarily includes Nd; and M represents one or more metal elements that are selected from the group consisting of Al, Si, V, Cr, Ti, Mn, Cu, Zn, Ga, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and Pb), wherein the compositional ratios x, y, and z respectively satisfy 4.2% by atom ≤ x ≤ 5.0% by atom, 12.5 % by atom ≤ y ≤ 14.0% by atom, 0% by atom < z ≤ 2.0% by atom, 0.0% by atom ≤ m ≤ 5.0% by atom, and 0.0 ≤ n ≤ 0.5. This iron base rare earth boron-based isotropic nanocomposite magnet alloy has a metal structure which has, as a main phase, an RE2Fe14B-type tetragonal compound that has a lower B concentration than the stoichiometric composition of an RE2Fe14B-type tetragonal compound, while having an average crystal grain size of not less than 10 nm but less than 70 nm, the average crystal grain size being smaller than the single domain critical diameter, and which comprises a phase that is richer in Fe than the main phase in the grain boundary phase that surrounds the main phase.
Inventors:
KANEKIYO HIROKAZU (JP)
YAMAZAKI TAKASHI (JP)
TAKAYAMA KAZUHIRO (JP)
YAMAZAKI TAKASHI (JP)
TAKAYAMA KAZUHIRO (JP)
Application Number:
PCT/JP2023/023185
Publication Date:
March 21, 2024
Filing Date:
June 22, 2023
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01F1/057; B22F1/00; B22F3/00; B22F9/04; C22C38/00; H01F41/02
Domestic Patent References:
| WO2021182591A1 | 2021-09-16 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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