MILLING DYNAMICS .2. DYNAMICS OF A SPEX MILL AND A ONE-DIMENSIONAL MILL

The dynamics of mechanical milling can be described in either local or global terms. Local descriptions consider aspects of powder deformati on, fracture, acid welding that transpire when powder is entrapped bet ween grinding media during a typical media collision. Global descripti ons consider heterogeneous aspects of milling in specific grinding dev ices; for example, the distribution of impact energies and powder segr egation within a mill. In part I of this series, we described facets o f attritor global dynamics. In this article, we do the same for a SPEX mill and for a hypothetical one-dimensional vibratory mill. In a fol lowing companion article, we compare the dynamics of an attritor with a SPEX mill and, by extension, other kinds of mills. Specific attentio n is paid to the relative efficiencies of these devices and the charac teristics of powder processed in them.