Abstract
The structure, phase composition and properties of cast and sintered didymium-iron-boron powder alloys have been studied. It has been shown that an increase in size of the initial powder particles leads to a decrease in i H c and Br of sintered magnets (this relation is to a great extent of a quantitative character). The dependence of magnetic characteristics ( i H c and Br) on the grain size of the main R 2 Fe 14 B magnetic phase and also on its volumetric part has been shown. As determined the grain size produced an effect on coercitivity without changing the value of residual magnetism. It has been established that the chemical composition declines from an optimum one and inaccurate observance of technical regimes leads to the lowering of magnetic properties of sintered magnets. The properties of structure-phase transformations in didymium-iron-boron alloys under isothermal annealing in vacuum have been investigated in order to establish a link between their structure and properties.
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