Cobalt-based magnet free of rare earths

Details Cobalt-based magnet free of rare earths Cobalt-based magnet free of rare earths

1989-09-14

1992-01-28

Sheehan, John P.

Metal treatment

Stock

Magnetic

148311, 420435, H01F 104

Patent

active

050841157

ABSTRACT:
A hard magnetic alloy free of rare earths, consisting of 14-20% of a transition metal (Zr or Hf), 1-5% silicon, 0.3-5.6% boron, and the remainder essentially cobalt, the alloy having a microstructure substantially devoid of nonmagnetic phases and consisting of a high proportion of (Co-Si).sub.11 TM.sub.2 phase and a lesser proportion of (Co-Si).sub.23 TM.sub.6 phase, such phases being distributed throughout in a regular manner in a fine grain. Substitution agents of nickel or iron may be used for up to 10% of the cobalt, substitutional agents of vanadium or niobium may be used for up to 5% of the TM, and aluminum, copper, or gallium for up to 2% of the silicon. The alloy has high coercivity, high temperture stability, and excellent corrosion resistance. The alloy may be processed directly by extrusion with reduced requirements for boron and silicon.

REFERENCES:
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patent: 4090892 (1978-05-01), Klein et al.
patent: 4131495 (1978-12-01), Menth et al.
patent: 4213803 (1980-07-01), Yoneyama et al.
patent: 4369075 (1983-01-01), Nobuo et al.
Treseder, NACE Corrosion Engineer's Reference Book, 1980, pp. 20 and 21.
"Hard Magnetic Properties of Nd-Co-B Materials", Journal of Applied Physics, Fuerst et al., 1988, vol. 64, No. 3, p. 1332.
"Magnetic Hardening of Pr2Co14B", Journal of Applied Physics, Fuerst et al., 1988, vol. 64, No. 10, p. 5556.
"Magnetic Moment Suppression in Rapidly Solidified Co-Te-B Alloys", Ghemawat et al., Journal of Applied Physics, vol. 63, No. 8, 1988, pp. 3388-3390.
Attached Appendix sheet.

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