The Morphology and Size Analysis of Fine Metal Powders
An electron microscopic study of powder particles by the carbon replica method was performed with respect to the following phenomena: aggregation, surface condition, crystal shape, growth process, inner structure, and measurement of particle size. Sample powders of tungsten, molybdenum, iron carbonyl, and nickel carbonyl were treated at various temperatures. In size analysis, air permeability and gas adsorption (B.E.T.) methods were applied in comparison with electron microscopy. Considerable disagreement of observed values among these methods was found at the early stage of the particle growth, but it decreased as particles grew according to thermal treatments. The electron microscopic data and adsorption data agreed with each other in the next stage, and, finally, with air permeability data. In the present treatment, a relationship between the size analysis and morphological change is discussed.
KeywordsPowder Particle Primary Particle Iron Carbonyl Tungsten Powder Tungsten Trioxide
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- 1.ïwase, Keizo, Toshio Takada, and Tsuneaki Hayashi, “Sintering and Crystallographic Characteristics of Very Fine Oxide Particles Produced by Calcination of Salts,” in: Werner Leszynski (ed.), Powder Metallurgy, Interscience (New York, London), 1961, 173.Google Scholar
- 4.Delisle, L., “A Method of Examination of Sections of Fine Metal Powder Particles with the Electron Microscope,” J. Metals 1: 228–232 (1949).Google Scholar
- 5.Sasaki, Nobuji, and Ryuzo Ueda, “Electron Microscopic and Diffraction Study on the Progress of Reduction of Tungsten Trioxide,” Vierter Internationaler Kongress ßr Elektronenmikroskopie, Vol. I, Springer-Verlag (Berlin), 1958, 479–484.Google Scholar