Title:
OXIDATION-RESISTANT RARE EARTH/IRON PERMANENT MAGNET BONDED WITH EPOXY
Document Type and Number:
Japanese Patent JPH0613216
Kind Code:
A
Abstract:
PURPOSE: To increase the oxidation resistance of a permanent magnet article at a high temperature by uniformly mixing a thermosetting epoxy resin with a composition, that contains at least one type of proper oxidation preventing agent and then blending iron - neodium - boron permanent magnet particles. CONSTITUTION: Iron - neodium - boron particles that are magnetic and isotropic with a coercive force of at least approximately 5×10<6> /4 πA/m (5,000 oersteds) at a room temperature is blended with an epoxy resin mixture, containing an epoxy resin and an antioxidant composition. The antioxidant composition is made of a phenol oxidation preventing agent with a steric hindrance with an equivalent amount of high molecular weight amount, thioester, and an antioxidant and exists by approximately 0.03-4.5 wt% with respect to the total mass of particles. The epoxy resin is made to exists by approximately 0.1-10.0 wt% with respect to the total mass of particles, thus enabling a permanent magnet article to markedly increase the oxidation resistance, especially at a high temperature.
Inventors:
JIYON CHIYAARUZU SHIYAIN
Application Number:
JP5525193A
Publication Date:
January 21, 1994
Filing Date:
March 16, 1993
Export Citation:
Assignee:
GEN MOTORS CORP
International Classes:
H01F1/053; H01F1/08; H01F7/02; (IPC1-7): H01F1/08; H01F1/053
Domestic Patent References:
| JPS6441201A | 1989-02-13 | |||
| JPS5061499A | 1975-05-27 | |||
| JPS60221454A | 1985-11-06 |
Attorney, Agent or Firm:
Masao Okabe (5 others)
Next Patent: MANUFACTURING METHOD OF RARE EATH MAGNET