Abstract
AbstractEleven powders of widely different properties (various grades of WC, WO3, tungsten, iron, cobalt, SiO2, Al2O3), considered typical of the raw materials encountered in powder metallurgy, have been studied by “single value methods” (apparent and tap density, air permeametry, gas adsorption (BET)) and by “size-distribution methods” (electron- and light microscope sizing, turbidimetry, sedimentation balance (with gaseous and with liquid medium), centrifugal air classification, and sieve analysis). In addition, a series of WC powders having varying degrees of fineness has been studied by air permeametry, gas adsorption, optical reflectivity, turbidimetry, and sedimentation in air, to assess the reliable working ranges of these methods.The following topics are treated in detail: air-permeability measurements and their relation to the results of BET and other tests; electron and light-microscope sizing techniques; turbidimetry; and optical reflectivity. A microscopic study of the breakdown of agglomerate...
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