Abstract
The application of shock consolidation of powder precursors using explosives for the processing of bulk permanent magnet materials was studied. Powders of Sm-Fe-N and Nd-Fe-B produced by milling of ingot material, mechanical alloying, hydrogenation- disproportionation-desorption and recombination (HDDR), or by pulverizing of melt-spun ribbon were pressed at a shock wave speed of 1200 m s-1 and pressures up to 4.4 GPa. It was found that consolidation of the hard magnetic powders could be achieved without changes of the phase structure and grain size and that the resulting bulk magnets had high coercivities and remanences. The final density depended on the composition of the material and on the initial grain size. The shock processing method was found to be particularly appropriate for the consolidation of nanostructured materials for which excessive grain growth during consolidation must be avoided.
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