Title:
希土類ボンド磁石
Document Type and Number:
Japanese Patent JP6463326
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a rare earth bond magnet having a small demagnetization property with respect to a temperature change and a high physical heat resistance.SOLUTION: A rare earth bond magnet comprises: rare earth-iron based magnet powder; and a thermosetting resin composition. The thermosetting resin composition includes: a main agent containing a first epoxy resin which is a multifunction epoxy resin and has a glass transition point of 200°C or higher after curing as a result of a reaction with a hardening agent, and a second epoxy resin which is a straight-chain epoxy resin and has a glass transition point of 120°C or lower after curing as a result of a reaction with the hardening agent; and the hardening agent. The proportion of the first epoxy resin and the second epoxy resin blended in the main agent is set so that the thermosetting resin composition has a glass transition point of 150°C or higher and an elastic modulus of 65 GPa or smaller.SELECTED DRAWING: None
Inventors:
Osamu Yamada
Asahi Yamane
Oya Shiho
Asahi Yamane
Oya Shiho
Application Number:
JP2016251580A
Publication Date:
January 30, 2019
Filing Date:
December 26, 2016
Export Citation:
Assignee:
MinebeaMitsumi Co., Ltd.
International Classes:
H01F1/057; B22F1/00; B22F3/00; H01F7/02; H01F41/02
Domestic Patent References:
| JP8109244A | ||||
| JP6260312A |
Foreign References:
| WO2007077752A1 |
Attorney, Agent or Firm:
Toranomon Intellectual Property Office