Abstract
As characterized by scanning and transmission electron microscopy, the microstructure of carbonyl iron powder is that of an expanded a-iron lattice containing carbon, oxygen and nitrogen, having a high internal stress, but no martensite phase. This fine, spherical powder is made by the thermal decomposition of iron pentacarbonyl. In the laboratory, particle size distribution has been characterized by image analysis and laser light scattering techniques. Data on narrow particle size distributions has been obtained, including electrical (P and Q) values, and compared to standard grades. As a result, the relationship of the decomposition process to the resulting metallurgical properties can be explored.
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References
W.D. Jones, Fundamental Principles of Powder Metallurgy, Edward Arnold, ed., Publishers Ltd., London, Chapter I (1960), p.131.
G. Bohm, Properties and Present Applications of CIP-BASF, 1983.
F.E. Janmot, Jr., and L. Muldawer, “Experimental Iron Carbonyl Powders,” Acta Metallurgica, Vol. 2 (May 1954).
Additional information
Joseph E. Japka received his B.M.E. from Brooklyn Polytechnic Institute in 1954. He is currently senior staff engineer with the GAF Chemical Corporation.
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Japka, J.E. Microstructure and Properties of Carbonyl Iron Powder. JOM 40, 18–21 (1988). https://doi.org/10.1007/BF03258115
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DOI: https://doi.org/10.1007/BF03258115