Bonded rare earth magnet and a process for manufacturing the sam

Details Bonded rare earth magnet and a process for manufacturing the sam Bonded rare earth magnet and a process for manufacturing the sam

1993-02-04

1994-04-05

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, H01F 102

Patent

active

053001567

ABSTRACT:
A highly rustproof resin-bonded magnet made by using a specific rustproofing resin for coating the particles of a magnetic powder, bonding them to form a molded body, or coating its surface, or for two or all of those purposes. The specific resin is selected from ones containing groups of atoms having a power of forming a coordinate bond and a reducing action. More specifically, it is (a) a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, (b) a redox resin as a reduction agent, or (c) a high molecular compound produced by curing a mixture of ascorbic acid, or a derivative thereof, and an epoxy resin.

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