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2010-12-10T16:56:44+01:00
2010-11-01T03:16:17Z
2010-12-10T16:56:44+01:00
Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0334478-A2-19890927
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EP-0334478-A2-19890927
A method of increasing the volume fraction of magnetically-aligned material in rare-earth (RE), iron, boron type anisotropic permanently magnetic material includes forming an adaptively-shaped, fully-dense, substantially magnetically-isotropic pre-form (64) from relatively coarse powder particles of melt-spun alloy containing a very fine-grain RE₂Fe₁₄B phase. The pre-form (64) is heated and die-upset to provide uniformity of strain in the pre-form (64) as it is conformed to the die walls (82), thereby causing an increased percentage of the crystallites in the pre-form (64) to be oriented along a crystallographically-preferred magnetic axis which increases the energy product of a resultant magnet formed therefrom.
A method of increasing the volume fraction of magnetically-aligned material in rare-earth (RE), iron, boron type anisotropic permanently magnetic material includes forming an adaptively-shaped, fully-dense, substantially magnetically-isotropic pre-form (64) from relatively coarse powder particles of melt-spun alloy containing a very fine-grain RE₂Fe₁₄B phase. The pre-form (64) is heated and die-upset to provide uniformity of strain in the pre-form (64) as it is conformed to the die walls (82), thereby causing an increased percentage of the crystallites in the pre-form (64) to be oriented along a crystallographically-preferred magnetic axis which increases the energy product of a resultant magnet formed therefrom.
en
European Patent Office
EP0334478
EP 0334478
H01F 41/02
H01F 01/08
Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically-aligned material
Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically-aligned material - European Patent Office - EP 0334478 A2
Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically-aligned material - European Patent Office - EP 0334478 A2
Adobe PDF Library 8.0
"EP0334478"; "EP 0334478"; "H01F 41/02"; "H01F 01/08"; "Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically-aligned material"
1.4
1
B
15
EP
0334478
A2
1989-09-27
89301499
1989-02-16
US
172666
1988-03-24
H01F 41/02
H01F 01/08
GENERAL MOTORS CORPORATION
Brewer, Earl G
Lee, Robert W.
Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically-aligned material
Herstellung von Fraktionen mit hohem Volumen an magnetisch ausgerichtetem Material vom RE-Fe-B-Typ durch Stauchung
Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically-aligned material
Fabrication de fractions à large volume du type RE-Fe-B, matériau magnétiquement aligné, par écrasement
A method of increasing the volume fraction of magnetically-aligned material in rare-earth (RE), iron, boron type anisotropic permanently magnetic material includes forming an adaptively-shaped, fully-dense, substantially magnetically-isotropic pre-form (64) from relatively coarse powder particles of melt-spun alloy containing a very fine-grain RE₂Fe₁₄B phase. The pre-form (64) is heated and die-upset to provide uniformity of strain in the pre-form (64) as it is conformed to the die walls (82), thereby causing an increased percentage of the crystallites in the pre-form (64) to be oriented along a crystallographically-preferred magnetic axis which increases the energy product of a resultant magnet formed therefrom.
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