Abstract
ABSTRACT Accurate and repeatable size measurement continues to be a problem in particulate materials processing. Eight different powders commonly employed for the production of high performance metal and ceramic components were used as a basis for examining the effects of powder characteristics on particle size measurement. Several different techniques were used to measure the particle size, including: laser diffraction with the powder dispersed both wet and dry, aerodynamic time-of-flight, electrical zone sensing, dynamic light scattering or photon correlation spectroscopy, and optical image analysis. After reviewing the size data obtained from these vastly different techniques, it is concluded that accuracy is strongly dependent on dispersion of the powder in the carrier fluid. Once adequately dispersed, one obtains analogous particle size information, independent of the instrument.
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