Permanent magnet and method of making it

Details Permanent magnet and method of making it Permanent magnet and method of making it

C - Chemistry, Metallurgy

22

C

75/165, 75/2, 14

C22C 1/04 (2006.01) C21D 6/00 (2006.01) C22C 19/07 (2006.01) H01F 1/055 (2006.01) H01F 1/08 (2006.01)

Patent

CA 1044487

ABSTRACT OF THE DISCLOSURE Disclosed is a rare earth permanent magnet comprising an alloy consisting of: RE2(Co1-x-yFexTMy) 17+z wherein: RE is at least one rare earth element: TM is at least one transition element selected from the group consisting of chromium, manganese, titanium, tungsten and molybdenum; -2 ? z ? ; 0.5 < (1-x-y) < 1 0.1 ? x ? 0.4 0.025 ? y ? 0.2 wherein the rare earth permanent magnet is further character- ized by possessing high values of coercive field strength, an ideal demagnetization curve and a remanence of more than 9KG and wherein the rare earth permanent magnet is prepared by the process which comprises mixing together a starting alloy of the composition RE2(Co1-x-yFexTMy)17+z and S to 14 wt.? of a samarium-rich sinter additive compound composed of 50-60 wt.? samarium and 40-50 wt.% of an alloy Co1-x-yFexTMy wherein z, (1-x-y), x and y have ranges as above and wherein both the starting alloy and the sinter additive are each in powder ?orm of average grain size 2.0 to 10µm; magnetically aligning the mix: compressing it to a greenling: sintering it to form a magnet? and subjecting the magnet to a heat treat- ment ?o 400°C - 600°C.

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