Open Access Conference Proceedings

The use of double sintering and rare-earth metal hydride additions allows us to substantially increase the hysteretic parameters of sintered permanent magnets having the composition (wt.%): Pr-14.7, Dy-16.9, Co-24.4, В-1.2, Al-0.3, Cu-0.15, Fe balance. The following magnetic characteristics were reached: Br = 0.95 T, jHc = 1640kA/m, Hk =1370kA/m, BHmax = 176 kJ/m3, temperature coefficient of induction |α|< 0.01 (Т=-60°C to+100 °C). The found weak dependence of structure-sensitive parameters, such as jHc and Hk on the cooling rate from the low-temperature heat-treatment temperature (500 °C) is discussed in connection with the invar and magnetostrictive behavior of the principal magnetic phase (Pr,Dy)2(Fe, Co)14B at temperatures below the Curie temperature, which were used for the low-temperature treatment. Measurements of temperature dependences of the electrical resistivity of the magnets allowed us to demonstrate the presence and absence of the electrical-resistivity anomaly corresponding to the Curie temperature for magnets free from cobalt and with high cobalt content, respectively.

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