永久磁石材料の微細構造制御と高性能化に関する研究−電磁波吸収体に関する研究を中心に−

Translated title of the contribution: Improvement of the performance of permanent magnets through microstructure control

Research output: Contribution to journalArticlepeer-review

Abstract

We have been improving magnetic properties of permanent magnets through microstructure control. The main researches were (1) development of high-performance Fe-Cr-Co magnets by recrystallization texture and high coercivity Mn-Sn-Co-N-based alloys. We have been also improving magnetic properties in (2) rare earth magnets. Namely, a) Dy reduction in Nd-Fe-B sintered magnets, b) development of high performance Sm-Fe-N magnets and c) highly anisotropic Nd-Fe-B HDDR powders. In addition, we have studied about (3) the usage of hard magnetic materials for electromagnetic wave absorbers. Recently, the use of microwaves in the GHz range has increased because of the demand for large data transmission. However, the problem of electromagnetic interference (EMI) has become serious, and much attention has been paid to microwave absorption materials. We have investigated magnetic loss of permanent magnet materials at natural resonance frequency, and have succeeded in the development of new microwave absorbers using M-type (or W-type ferrite) and RE-Fe-B (RE: rare earth) compounds. In this article, researches described above, especially researches about microwave absorbers, are summarized.

Translated title of the contributionImprovement of the performance of permanent magnets through microstructure control
Original languageJapanese
Pages (from-to)659-665
Number of pages7
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume67
Issue number12
DOIs
Publication statusPublished - 2020

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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