Graphical and statistical comparison of various size distribution measurement systems using metal powders of a range of sizes and shapes

The purpose of this paper was to describe the results of particle size analysis from image analysis, sieving analysis and dry or wet dispersion laser diffraction and compare these techniques. Measurements were made on particle systems of different morphological characteristics, size and particle size distribution widths using the most common metal powders. The results show reasonably good agreement between the different techniques concerning the shape of the distribution. However, there is a discrepancy regarding the absolute values, which can be explained by the fact that the techniques used are based on different measuring principles. The study suggests that image analysis is a powerful tool in characterising non-spherical particles, especially elongated particles and that caution needs to be taken when evaluating the sizing results of non-spherical particles using laser diffraction.