Manufacturing soft magnetic components using a ferrous...

H - Electricity – 01 – F

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H01F 1/22 (2006.01) H01F 1/24 (2006.01) H01F 1/26 (2006.01)

Patent

CA 2446040

Near-net-shape soft magnetic components can be produced from iron powder- lubricant compositions using powder metallurgy techniques. The resulting components have isotropic magnetic and thermal properties and may be shaped into complex geometry using conventional compaction techniques. A non-coated ferromagnetic powder is mixed with a lubricant and compacted. After compaction, the components are thermally treated at a moderate temperature to burn out the lubricant, and possibly also relieve the stresses induced during pressing and reduce the hysteresis losses. Depending on the application, the properties of the material may be tailored by varying the content and type of the lubricant and the thermal treatment conditions.

L'invention concerne des composants magnétiques doux près de la cote désirée que l'on peut produire par des techniques de métallurgie des poudres à partir de compositions de poudre de fer et de lubrifiant. Les composants résultants présentent des propriétés magnétiques et thermiques isotropes, et on peut leur conférer des formes géométriques complexes par des techniques de compression classiques. On mélange à un lubrifiant une poudre ferromagnétique non revêtue, que l'on comprime. Après compression, les composants sont thermiquement traités à une température modérée de façon à épuiser le lubrifiant et, éventuellement, atténuer les contraintes induites pendant le pressage et réduire les pertes par hystérésis. En fonction de l'application, on peut individualiser les propriétés du matériau en faisant varier le contenu et le type du lubrifiant ainsi que les conditions de traitement thermique.

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