Process for producing single phase magnetite powder

Details Process for producing single phase magnetite powder Process for producing single phase magnetite powder

H - Electricity

01

F

H01F 1/36 (2006.01) C01G 49/08 (2006.01) G03G 9/083 (2006.01) G03G 9/107 (2006.01) G11B 5/706 (2006.01) H01F 1/11 (2006.01) H01F 1/44 (2006.01)

Patent

CA 2133642

Hematite powder is mixed with a substance having a carbon-to-carbon single or double bond, and sintered in an inert gas to form magnetite powder. The magnetite powder can be provided with a desired electric resistance while retaining the properties characteristic of the magnetite powder by effecting a heating in an oxygenic atmosphere after the formation of the magnetite powder (or during a cooling subsequent to the sintering in the inert gas).

On mélange une matière présentant une liaison simple ou double entre les atomes de carbone avec une poudre d'hématite, puis on la brûle dans un gaz inerte de manière à produire de la poudre de magnétite. On soumet ensuite ladite poudre de magnétite à un traitement thermique dans de l'oxygène (ou dans le procédé de refroidissement une fois réalisé le brûlage dans le gaz inerte). On peut ainsi conférer la résistance voulue à la poudre de magnétite sans en modifier les caractéristiques.

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