EP 0619584 A2 19941012 - Magnetic body formed from encapsulated ferromagnetic particles and method for the manufacture thereof.
Title (en)
Magnetic body formed from encapsulated ferromagnetic particles and method for the manufacture thereof.
Title (de)
Magnetkörper aus eingebetteten ferromagnetischen Partikeln und Herstellungsverfahren dafür.
Title (fr)
Corps magnétique formé de particules ferromagnétiques encapsulées et méthode de fabrication.
Publication
Application
Priority
US 4442193 A 19930409
Abstract (en)
A method for stress-relieving a compression-moulded magnetic body is provided for purposes of enhancing the magnetic permeability of the magnetic body. The method involves encapsulating ferromagnetic particles with a preferred polymeric coating material, comprising either a polybenzimidazole or a polyimide derived from either 3-4' oxydianiline or polymethylene dianiline. The preferred coating materials are capable of withstanding elevated temperatures for a duration which is sufficient to anneal the magnetic body formed from the coated metal particles. As a result, the stresses induced in the magnetic core by the compression-moulding process can be relieved without detriment to the mechanical properties and magnetic characteristics of the magnetic core.
IPC 1-7
IPC 8 full level
H01F 1/22 (2006.01); H01F 1/26 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP)
H01F 1/26 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0619584 A2 19941012; EP 0619584 A3 19941026; EP 0619584 B1 19970716; DE 69404195 D1 19970821; DE 69404195 T2 19971030; JP H076911 A 19950110
DOCDB simple family (application)
EP 94200723 A 19940321; DE 69404195 T 19940321; JP 7228594 A 19940411