Materials Processing of Rare Earth-Cobalt Permanent Magnets
Final rept. 1 Jan-30 Sep 1973
STANFORD RESEARCH INST MENLO PARK CA
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The RECo5 intermetallic compounds, where RE stands for one of the light rare earths, show a high magnetic saturation and very high magneto- crystalline anisotrophy. During the present program, alternative materials processing techniques were investigated in an effort to develop improved powder preparation methods. The methods investigated were 1 ball milling in a nonreactive liquid, 2 plasma spheroidization of alloy particles, 3 plasma annealing without melting alloy particles, 4 electrodeposition of rare earth- cobalt alloys, and 5 metallothermic reduction of rare earth-cobalt alloys. The primary material used in this study was SmCo5 but studies were also made on PrCo5 and MMCo5 containing major amounts of cerium. Oxidation and sintering of SmCo5 was discussed in detail.
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