Cobalt-based magnet free of rare earths

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

H - Electricity

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75/110, 148/5

H01F 1/047 (2006.01) C22C 19/07 (2006.01) C22F 1/10 (2006.01) H01F 1/08 (2006.01) H01F 7/02 (2006.01)

Patent

CA 2019392

-17- Abstract of the Disclosure A hard magnetic alloy free of rare earths, consisting of 14-20% of a transition metal (Zr or Hf), 1-5% silicon, .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)11TM2 phase and a lesser proportion of (Co-Si)23TM6 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. 4335L

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