Method of preparing bonded magnet and bonded magnet
AssigneeNichia Corporation
InventorsTakashi Asada, Shuichi Tada
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Abstract
The present disclosure aims to provide a bonded magnet having good magnetic properties and a method of preparing the bonded magnet. The present disclosure provides a method of preparing a bonded magnet, including: a first compression step of compressing a magnetic powder having an average particle size of 10 μm or less while magnetically orienting it to obtain a first molded article; a second compression step of bringing the first molded article into contact with a thermosetting resin having a viscosity of 200 mPa·s or less, followed by compression to obtain a second molded article; and a heat treatment step of heat treating the second molded article.
Claims11
A method of preparing a bonded magnet, the method comprising:
- a first compression step of compressing a magnetic powder having an average particle size of 10 μm or less while magnetically orienting it in a mold to obtain a first molded article;
- a second compression step of bringing the first molded article that is magnetically oriented into contact with a thermosetting resin having a viscosity of 200 mPa·s or less in the mold, followed by compression in the mold to obtain a second molded article;
- and
- a heat treatment step of heat treating the second molded article,
- wherein a magnitude of pressure applied in the second compression step is at least 4 ton/cm2,
- wherein the mold has an inner plate to facilitate removal of extra thermosetting resin in the second compression step, and
- wherein the size of the mold is such that the first molded article has a volume of at least 0.1 but not more than 10 cm3.
Dependencies are inferred from the claim text.