Summary
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1.
It has been established that uniform tungsten powders with grains between 10 and 50μ in size can be produced by reduction of ammonium paratungstate or oxides obtained from the latter, in a muffle furnace at a temperature of 1200°C and a hydrogen consumption of 4 m3/h over the muffle cross section.
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2.
A procedure has been developed for evaluating, under industrial conditions, the particle-size distribution of the tungsten powders produced. The procedure consists in preparing compacts and infiltrating them with copper, with subsequent visual examination of the particle-size distribution in microsections under the microscope at a magnification of 120 diameters.
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Literature cited
L. I. Klyachko and Ya. D. Kagan, Tsvetn. Metal., No. 9 (1961).
C. J. Smithells, Tungsten [Russian translation] (Metallurgizdat, Moscow, 1958).
A. A. Glagolev, Geometrical Methods for the Quantitative Analysis of Aggregates under the Microscope [in Russian] (Gosgeolizdat, L'vov, 1941).
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Klyachko, L.I., Semenova, M.P. & Besolova, N.K. The preparation of coarse-grained tungsten powders and evaluation of their particle size. Powder Metall Met Ceram 3, 415–417 (1965). https://doi.org/10.1007/BF00774244
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DOI: https://doi.org/10.1007/BF00774244