異方性Ca-La-Nd系フェライト磁石の諸特性

概要

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Experiments were carried out to obtain the optimum condition for preparing anisotropic Ca-La-Nd ferrite magnets having the best magnetic and physical properties. The best composition was pursued according to the formula {(100-X)(CaO·6Fe2O3)} {X(70%La2O3)}, varring X from 1.0 to 13 wt%. The samples used in this experiment were prepared by mixing of the raw materials of a-Fe2O3, CaCO3, and 70% La2O3 (contains 20% Nd2O3) powder. The optimum condition of making magnets and some properties of atypical specimen are as follows. The preparation condition: composition of {92(CaO·6Fe2O3)8(70%La2O3)}, prefiring condition of 1225°C for 1 h in O2 gas and sintering condition of 1250°C for 0.5h in O2 gas. Magnetic and physical properties.: 4πI10k=4100G, 4πIr=3900G, IHc=1800 Oe, BHH=1760 Oe, (BH)max=3.6 MG·Oe, Ku=3.3×106 erg/cc, HA=20.0 kOe, as=65.0 emu/g, Tc=451°C and D=5.07 g/cc.
社団法人粉体粉末冶金協会の論文