The High-Energy Milling Process

The fundamental principle of size reduction in mechanical attrition is the energy apphed to the sample during impacts with the milhng media, usually a small ball. The particles are trapped between two colhding balls and then compressed into small pieces (Fig. 7.1). 

According to Harris [6], the major factors contributing to grind limit are  

The grinding limit is demonstrated in the work of Kim et al. [5] who concluded, after milling Fe-Co powders for 30 h, that the process reached a steady state where the particles became homogenized in size and shape, with particle size approaching a limit of 10 xm, and crystallite size approaching 10 mn. 

The major differences between conventional ball milling and high-energy ball milling (HEBM) are  

These are some of parameters that affect the final constitution of the powder when 

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Irradiation (e-beam or y-irradiation) is classified among the high-energy solid-state processes. Some similarities between mechanical milling and irradiation to compatibilize nonmiscible blends have been observed by different authors. 1- Smith et al. considered that these processes lead to the same phenomena (chain scission, cross-linking, amorphization), and they claimed that the factors influencing these phenomena (polymer chemical structure and temperature) are not dependent on the process. ... 

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