Conclusions
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1.
Chromium carbide coatings of high quality have been obtained by using the principle of mixing the graphite powder to be coated with chromium particles with a supply of NH4Br, in a closed reaction volume.
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2.
Chemical transport of chromium to graphite powders are effected in a closed reaction volume from chromium particles, and a layer of carbides was grown on the powders by diffusion kinetics. The maximum depth of the chromium carbide coating at a process duration of 90 min was 27μ. The presence of hydrogen intensified the process.
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3.
Compared with impregnation in a stream of bromides, chromizing graphite powders in a closed reaction volume reduces chromium consumption and increases the yield of the apparatus.
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G. V. Zemskov and A. I. Shestakov, Poroshkovaya Met., No. 9 (1965).
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Translated from Poroshkovaya Metallurgiya, No. 1, pp. 25–27, January, 1968.
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Shestakov, A.I., Zemskov, G.V. & Smekh, E.V. Diffusion chromizing of graphite powders in a closed reaction volume. Powder Metall Met Ceram 7, 20–22 (1968). https://doi.org/10.1007/BF00776104
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DOI: https://doi.org/10.1007/BF00776104