Permanent magnets made from iron alloys

Details Permanent magnets made from iron alloys Permanent magnets made from iron alloys

1993-04-08

1995-04-04

Wyszomierski, George

Metal treatment

Stock

Magnetic

420 83, H01F 1053

Patent

active

054034078

ABSTRACT:
A new alloy for permanent magnets which is of the composition (R.sub.x Fe.sub.y-w Co.sub.w M.sub.z)L.sub..alpha. transition metals M such as, but not limited to Cr, Mo, Ti and V and mixtures thereof. R would be rare earth metals such as, but not limited to Nd, Pr, Dy and Tb, other rare earths, Y, and La and mixtures thereof. L is carbon or nitrogen or a mixture thereof. x+y+z equals 100 atomic %, x is from about 5 to about 20%, y is from about 65 to about 85%, z is from about 6 to about 20%, w.ltoreq.20%, and .alpha. is from about 4 to about 15%. We have also developed a new process whereby the alloy metal magnets are formed by taking the ingredients and arc melting the individual elements R, Fe, Co and M at least once whereby forming an alloy ingot, and if necessary, remelting the alloy ingot as many times as necessary and reforming the alloy to form a more uniform alloy. The alloy formed is then ground into a powder. The powders are then formed into magnets and are bonded at high temperatures.

REFERENCES:
patent: 5114502 (1992-05-01), Bogatin
patent: 5135584 (1992-08-01), Fujiwara
patent: 5186766 (1993-02-01), Iriyama et al.
J. Appl. Phys., vol. 61 (8), "Formation and Properties of NdFeB Prepared by Mechanical Alloying and Solid State Reaction", Schultz et al., Apr. 15, 1987, pp. 3583-3585.
J. Appl. Phys., vol. 70 (10), "Permanent Magnets by Mechanical Alloying (Invited)", Schultz et al., Nov. 15, 1991, pp. 6339-6344.

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