Rapid Particle-Size Analysis of Metal Powders with an Electronic Device
An electrical sensing-zone, particle-size analyzer, based on the resistance change principle— the Coulter Counter—is examined for its usefulness in the powder metallurgy field. The theory underlying its operation is discussed briefly, as well as the analysis procedure involved, including calibration of the instrument, compilation of data, and data reduction. Technical considerations with respect to metal powders, such as the choice of an electrolyte, filtration of this electrolyte, and methods of achieving a dispersion of the powder in the electrolyte, are presented. Maximum and minimum limits of particle-size measurement for various metals are indicated, along with size ranges which can be covered. Coulter Counter particle-size distributions of several types of metal powders (aluminum and copper) are compared with results obtained using the Roller Air Analyzer, micromesh sieves, the Fisher Sub-Sieve Sizer, and/or the Sharpies Micromerograph.
KeywordsMetal Powder Aluminum Powder Coulter Counter Ragweed Pollen Oscilloscope Screen
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