Cobalt-Free Permanent Magnet Alloys.
Final rept. Oct 81-Dec 83,
COLT INDUSTRIES INC PITTSBURGH PA CRUCIBLE RESEARCH CENTER
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We have undertaken the study of cobalt-free alloys for evaluation of their use in permanent magnet fabrication. A two-phase study was carried out. In the first phase, the plasma arc process was employed for the production of fine powder of MnAlC and the second phase was confined mainly with melt spinning. Both of these rapid solidification technology approaches should permit stabilization of metastable phases and offer a unique technique of generating coercivity. The results of our investigation indicate that melt spinning of boron containing Nd-Fe and Pr-Fe alloys can provide high values of coercive force and saturation magnetization. The composition of the magnetic phase responsible for the high coercive force was identified to be R3Fe20B. Author.
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