Materials Processing of Rare Earth-Cobalt Permanent Magnets
Semiannual interim technical rept. no. 5, 1 Jul-31 Dec 1972
STANFORD RESEARCH INST MENLO PARK CA
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The objectives of the program are to investigate materials processing methods with the goal of achieving optimum properties of SmCo5 and other RECo5 compounds as permanent magnets. The primary problem is achieving high magnetic coercivity. Studies to gain further knowledge of the liquid-phase sintering process and magnetic evaluation of sintered alloys were carried out prior to this research period, and studies of the final stage of sintering solid-state process were conducted during this period and are reported. Selective internal oxidation of samarium invariably accompanies magnet powder processing. A study of the kinetics of oxidation and the morphology of the oxide subscale was completed during this period. Studies on oxygen solubility in SmCo5 and the precipitation of oxide inclusions during quenching and aging are reported. A study of Sm2Co17 precipitation in samarium-depleted SmCo5 grains is included.
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