Abstract
Two kinds of Sm(CobalFe0.1Cu0.09Zr0.03)7.24 high temperature magnets were fabricated by a traditional powder metallurgical technology with different annealing processes. A record of maximum energy product of 94.73kJ/m3 at 773K with a high intrinsic coercivity of 652.72kA/m was made. Based on the theoretical and experimental results, it was found that the temperature coefficient of the coercivity was strongly influenced by the variation of the Curie temperature of the cell wall phases and the domain wall energy ratio between cell and cell wall phases at 0K. The characteristic properties originate from the element redistribution between SmCo5/Sm2Co17 interfaces while annealing.
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