EP 1028437 A1 20000816 - HIGH CORROSION-RESISTANT R-Fe-B-BASE BONDED MAGNET AND METHOD OF MANUFACTURING THE SAME
Title (en)
HIGH CORROSION-RESISTANT R-Fe-B-BASE BONDED MAGNET AND METHOD OF MANUFACTURING THE SAME
Title (de)
KORROSIONSBESTÄNDIGE R-FE-B VERBUNDMAGNET UND HERSTELLUNGSVERFAHREN
Title (fr)
AIMANT LIE A BASE DE R-Fe-B EXTREMEMENT RESISTANT A LA CORROSION ET PROCEDE DE FABRICATION DUDIT AIMANT
Publication
Application
Priority
- JP 9804829 W 19981023
- JP 31643597 A 19971030
- JP 33368197 A 19971117
- JP 4455898 A 19980210
- JP 4455998 A 19980210
- JP 4882798 A 19980212
- JP 4882898 A 19980212
- JP 5604498 A 19980219
- JP 8301198 A 19980312
- JP 8301298 A 19980312
- JP 10349698 A 19980330
Abstract (en)
A method of efficiently manufacturing R-Fe-B-base bonded magnets of various shapes such as ring shape and disk shape having a high corrosion resistance and capable of being plated electrically with ease, wherein the corrosion resistance of the magnet is improved by forming a conductive film of a metal on the surface thereof with tight adhesion, uniformity and efficiency. The method comprises filling the holes of the magnet with polishing powder, inorganic powder and polishing chips, fixing these materials in the holes by fat of a vegetable medium and sealing the resultant holes, and barrel-polishing the magnet by a barrel unit in the dry process with indefinitely shaped, i.e. spherical, massive or acicular (wiry) pieces of a required size of Cu, Sn, Zn, Pb, Cd, In, Au, Ag, Fe, Ni, Co, Cr and Al and such pieces of alloys thereof used as a metallic medium. Said fine pieces of metals such as Cu are press fitted into a resin surface and holes of the bonded magnet and cover the surface and holes and further, cover the surfaces of particles of magnetic powder whereby a very uniform conductive film can be formed on the surface of the bonded magnet, so that it becomes possible to subject the bonded magnet to electric plating excellently and obtain a plated R-Fe-B-base bonded magnet of a high corrosion resistance and with minimum deterioration of the magnetic properties.
IPC 1-7
IPC 8 full level
CPC (source: EP KR)
C25D 3/562 (2013.01 - EP); C25D 5/34 (2013.01 - EP); H01F 7/02 (2013.01 - KR)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 1028437 A1 20000816; EP 1028437 A4 20010613; EP 1028437 B1 20060517; CN 1205626 C 20050608; CN 1279810 A 20010110; DE 69834567 D1 20060622; DE 69834567 T2 20070426; KR 100374398 B1 20030304; KR 20010040267 A 20010515; WO 9923675 A1 19990514
DOCDB simple family (application)
EP 98950380 A 19981023; CN 98811456 A 19981023; DE 69834567 T 19981023; JP 9804829 W 19981023; KR 20007004631 A 20000428