Effect of jar shape on high-energy planetary ball milling efficiency: Simulations and experiments

Abstract

Please cite this article as: M. Broseghini, M. D'Incau, L. Gelisio, N.M. Pugno, P. Scardi, Effect of jar shape on high-energy planetary ball milling efficiency: Simulations and experiments, (2016), AbstractEnhanced comminution in a planetary ball mill was achieved by suitably re-designing the jar shape. Compared with a traditional cylindrical vial of circular cross-section, the new jar was modified internally to have a flat wall portion resulting in a half moon cross-section. Results from simulations, using a multibody dynamics software, suggest that this geometry increases the number of high-velocity collisions with energy exchange along the axial direction, deemed as more effective in the comminution process. X-ray diffraction line profiles of calcium fluoride (CaF 2 ) ground in the two jars under equivalent conditions were used to obtain information on the microstructure resulting from the milling process and validate the modelling results. A better homogeneity and a faster reduction of crystallite size was achieved using the new design compared to that using the standard cylindrical vial design. Optimal operating conditions, in terms of jar-to-plate angular velocity ratio, are correlated and discussed according to the model predictions.

Debye–Waller coefficient of heavily deformed nanocrystalline iron

“…The studied sample is an Astaloy Mo powder (Fe-1.5 wt% Mo, FeMo), extensively ground (64 h) in a Fritsch P4 planetary ball mill. Details of the grinding process and the resulting powder can be found in the paper by Rebuffi et al (2016) for the experimental part and electron microscopy, whereas the work of Broseghini et al (2016) deals with a kinetic modelling of the mill used in the optimization of the grinding process.…”

Homogeneity of ball milled ceramic powders: Effect of jar shape and milling conditions

“…Twelve balls were inserted in a cylindrical and in a half-moon jar (physical and geometrical properties reported in [1], [6]), designed by the authors and produced at the University of Trento (Italy).…”

“…An ESEM FEI XL 30 was employed to acquire SEM images while XRPD data were collected using a Rigaku PMG/VH diffractometer according to the procedure reported in [1], [5].…”

“…8 in [1]). Two lognormal size distributions, representing respectively the finer and the coarser (less or totally not ground crystals) fractions of the end product, were required to properly model XRPD data.…”

“…This paper contains data and supporting information of and complementary to the research article entitled “ Effect of jar shape on high-energy planetary ball milling efficiency: simulations and experiments ” (Broseghini et al,) [1]. Calcium fluoride (CaF 2 ) was ground using two jars of different shape (cylindrical and half-moon) installed on a planetary ball-mill, exploring different operating conditions (jar-to-plate angular velocity ratio and milling time).…”