Conclusions
When sintered iron with a certain porosity (14–20%) is saturated with nitrogen, the amount of absorbed N2 and the depth of the nitride layer increase jumpwise. If we regard the porous material as a biphase mixture (of pores and iron particles), such a phenomenon can be associated with the jumpwise increase of the effective diffusion coefficient at a certain quantitative ratio of the phases (the so-called percolation effect of diffusion). When porous iron is nitrided, a peculiar morphological form of the nitride phases forms in the diffusion layer; this, in distinction to the acicular nitrides, which are typical of the nitriding of compact iron, has a comparatively equiaxial shape and sinuous phase boundaries.
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I. M. Fedorchenko and L. N. Pugina, Composite Sintered Antifriction Materials [in Russian], Naukova Dumka, Kiev (1980).
V. G. Gorbach, I. Ya. Kanovskii, V. M. Nitsovich, and V. I. Udovitskii, “Phase transitions and percolation diffusion in the process of thermodiffusional saturation of multicomponent materials,” Dokl. Akad. Nauk Ukr. SSR, Ser. A, No. 1, 71–74 (1987).
M. V. Belous, Yu. N. Moskalenko, and V. G. Permyakov, “The magnetic properties of iron nitrides,” Izv. Vyssh. Uchebn. Zaved., Chern. Metall., No. 10, 75–78 (1969).
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Translated from Poroshkovaya Metallurgiya, No. 4(340), pp. 24–28, April, 1991.
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Gorbach, V.G., Meshashti, S. & Moskalenko, Y.N. Formation of nitride phases in the nitriding of porous iron. Powder Metall Met Ceram 30, 283–286 (1991). https://doi.org/10.1007/BF00795957
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DOI: https://doi.org/10.1007/BF00795957