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Influence of Granulation and Ni-Containing Binder Composition on the Self-Propagating High-Temperature Synthesis of Carbides in the Ti–Cr–C System

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Abstract

We have studied the combustion process and the phase composition of its products using granulated 70 wt % (Ti + C) + 30 wt % (3Cr + 2C) and 80 wt % (Ti + C) + 20 wt % (3Cr + 2C) mixtures with nickel-containing binders. The results demonstrate that the addition of a nickel binder reduces the chromium content of the (Ti,Cr)C double carbide, because nickel reacts with chromium to form Nichrome. In the case of combustion of the granulated 80 wt % (Ti + C) + 20 wt % (3Cr + 2C) mixture with the addition of Kh20N80 Nichrome, a Nichrome-binder-containing (Ti,Cr)C double carbide essentially free of impurity phases according to X-ray diffraction data has been prepared in a single step. A two-step mechanism of final product formation has been proposed. According to scanning electron microscopy data, the grain size of the combustion products is 2–5 μm, which is an order of magnitude smaller than the initial titanium and chromium particle size. In contrast to powder mixture combustion products, which are difficult to disintegrate, the agglomerate obtained via the combustion of a granulated mixture broke into separate granules, which could be ground to a desired particle size under laboratory conditions.

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Notes

  1. Samples for analysis were provided by V.V. Zakorzhevski.

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Authors and Affiliations

  1. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    B. S. Seplyarskii, R. A. Kochetkov, N. I. Abzalov, I. D. Kovalev & T. G. Lisina

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  1. B. S. Seplyarskii
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  2. R. A. Kochetkov
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  3. N. I. Abzalov
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  4. I. D. Kovalev
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  5. T. G. Lisina
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Correspondence to B. S. Seplyarskii.

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Seplyarskii, B.S., Kochetkov, R.A., Abzalov, N.I. et al. Influence of Granulation and Ni-Containing Binder Composition on the Self-Propagating High-Temperature Synthesis of Carbides in the Ti–Cr–C System. Inorg Mater 56, 909–917 (2020). https://doi.org/10.1134/S0020168520080142

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