EP 0386286 B1 19951018 - Rare earth iron-based permanent magnet.
Title (en)
Rare earth iron-based permanent magnet.
Title (de)
Auf Seltenerdeisen basierender Dauermagnet.
Title (fr)
Aimant permanent à base de métal de terre rare et de fer.
Publication
Application
Priority
- EP 89104002 A 19890307
- JP 23348187 A 19870917
Abstract (en)
[origin: EP0386286A1] A rare earth-based permanent magnet is formed of a ternary compound composed of 12-30% by weight of a rare earth element, 1-10% by weight of titanium and the balance of iron or a quaternary compound composed of 12-30% by weight of a rare earth element, 1-10% by weight of titanium, up to 34% by weight of cobalt and the balance of iron. Specifically, the ternary and quaternary compounds have a crystalline structure belonging to the body-centered tetragonal system of the ThMn12 type. Different from conventional neodymium-boron-iron magnets, the inventive magnets are corrosion resistant and free from rusting and have a greatly improved Curie point as compared with rare earth-iron binary magnets. The incorporation of cobalt to the ternary compound has an effect of further increasing the Curie point.
IPC 1-7
IPC 8 full level
H01F 1/055 (2006.01)
CPC (source: EP)
H01F 1/055 (2013.01); H01F 1/0557 (2013.01)
Citation (examination)
EP 0106948 A2 19840502 - SUMITOMO SPEC METALS [JP]
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 89104002 A 19890307