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Shaping of metal powders - A survey
Soviet Powder Metallurgy and Metal Ceramics, 19701. The principles of a discrete contact theory of pressing have been formulated. 2. Extensive experimental data have been accumulated on standard pressing techniques (pressing in closed die sets, hydrostatic and hot pressing). 3.
I. D. Radomysel'skii, G. G. Serdyuk
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Shape Distribution of Magnetite Powders
Journal of Applied Physics, 1959The shape distribution curves of single-domain magnetite powders calculated from magnetic data do not agree with those observed in the electron microscope. The Stoner-Wohlfarth theory, from which the magnetic unaveraging process was derived, ignores magnetocrystalline anisotropy. This may be one of the contributory causes to the lack of agreement.
Clark E. Johnson, William Fuller Brown
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Sampling Powders for Shape Description
Particle & Particle Systems Characterization, 1984AbstractFor some time studies have been made relating the values obtained from simple shape description to bulk powder properties. More recently the detailed mathematical description of particle outline has become possible and quite powerful techniques have been developed.
Arthur E. Hawkins, Kenneth W. Davies
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Shape Distribution of Magnetic Powders
Journal of Applied Physics, 1958In work reported earlier, the average length-to-diameter ratios determined magnetically did not agree with those observed under the electron microscope; this was thought due to magnetic interactions. This paper describes further shape determination measurements on γ-Fe2O3 samples of increasing dilution by the original method and by two analogous ...
Clark E. Johnson, William Fuller Brown
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Image Analysis of the Shape of Granulated Powder Grains
Journal of Pharmaceutical Sciences, 2004This study presents and evaluates two new form factors for the characterization of pharmaceutical microparticles using image analysis techniques. The first factor, denoted Vr, is mean percentage variation in radial chord length (for a large number of radial chords drawn at small angular intervals) with respect to mean radial chord length.
Sergio, Almeida-Prieto +2 more
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Metal Powder Production and Powder Size and Shape Distribution
2020Abstract This article provides an overview of the general methods of metal powder production. It details the primary methods for particle sizing used in additive manufacturing: sieving, laser diffraction and scattering, and digital image analysis.
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Preparation of rod-shaped BaTiO3 powder
Journal of Materials Science, 1986Rod-shaped BaTiO3 powder particles have been prepared from rod-shaped TiO2 ·nH2O and BaCO3 in molten chloride. The morphology of BaTiO3 particles was studied referring to the effects of the chemical species of the starting titanium compound, amount of chloride, particle size of the titanium compound and reaction conditions, and the preparation ...
Yoshihiro Hayashi +2 more
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SPHEROIDIZATION OF IRREGULARLY SHAPED METAL POWDERS
Powder Metallurgy, 1961AbstractIrregularly shaped powders of aluminium, 90:10 bronze, 302B stainless steel, electrolytic copper, titanium, molybdenum, and tungsten carbide were converted into spherically shaped powders by dropping the powders through vertical furnaces. Several types of furnaces were built and used.
M. J. WAHLL +2 more
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The Effect of the Shape of Powder Grains on the Measured Size Distribution of a Powder
Particulate Science and Technology, 1997ABSTRACT Widely used methods of powder size characterization, such as optical diffractometers, image analysis, and sieving, often generate data which differs significantly for studies of the same powder. Newer methods of shape characterization are making it possible to study the reasons for the differences.
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