焼結Fe-Cr-Co磁石の磁気特性に及ぼす諸元素の影響

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By using water-atomized Fe-Cr-Co powder, an influence of some elements such as Cr, Co, Si, S and B on densification and magnetic properties of Fe-Cr-Co magnets was investigated. The results were as follows.(1) Magnetic properties of sintered Fe-Cr-Co magnets were expressed well by relation between Fe/Co and (Fe+Co)/Cr. Fe-Cr-Co system superior of remanence (Br) were plotted on the extended line of the composition of Alnico type magnets such as Ticonal 2000, Alnico 8 and Alnico 5. Coercive force (Hc) tended to become higher with decreasing the ratio of (Fe+Co)/Cr.(2) Silicon lowered the oxygen content in water-atomized Fe-Cr-Co powder and improved densification of compacts by sintering, where optimum silicon content was about 1%.(3) Sulfur addition also improved densification of compacts by sintering. In the case of sulfur addition, magnetic properties were better than those of silicon addition, where optimum sulfur content was about 0.10∼0.20%.(4) Sulfur and boron addition further improved densification of compacts by sintering and resultantly, magnetic properties.
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