Nano materials preparation mechanism of planetary ball mill

Abstract Mechanical ball milling is a planetary ball milling process used to prepare nanomaterials, but its preparation mechanism is still not clear. Previous research has focused more on the influence of various operating parameters of the ball mill, with relatively little attention paid to the motion analysis of the milling balls, resulting in a lack of systematic research. In this study, the motion of milling balls during the mechanical ball milling process for nano fly ash materials was analyzed, taking the unique agglomeration phenomenon during ultrafine grinding into account. A grinding rate coefficient was proposed, and a mechanism function for the preparation of nanomaterials using planetary ball milling was constructed, and its main influencing factors were analyzed and experimentally verified. The results indicate that the order of the influence of the three factors is as follows: grinding medium filling rate > ball milling speed > ball milling time. When the grinding particle size is above 1300 nm, the mechanism function can be directly used, while the particle sizes is below 1300 nm, the mechanism function needs to be combined with the agglomeration level for better accuracy. The calculation error is within 5%. The grinding rate coefficient is only related to the material hardness. By experimentally measuring the grinding rate coefficients of different materials, the mechanism function can be applied to guide the theoretical preparation process of the nanomaterials.