Materials Processing of Rare Earth-Cobalt Permanent Magnets.

摘要

The RECo5intermetallic 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 SmCo5but studies were also made on PrCo5and MMCo5containing major amounts of cerium. Oxidation and sintering of SmCo5was discussed in detail.