Abstract—
We have studied the potentialities of dispersion and precipitation modification of a cobalt alloy in combustion mode under the effect of centrifugal forces. The starting mixture consisted of Co3O4, Cr2O3, Nb2O5, MoO3, and Al, with titanium carbide and a mechanical mixture of titanium powder and carbon black as modifying additives. The basic mixture has been shown to burn in a wide range of titanium carbide additions under normal conditions. The use of a centrifugal force field allows the phase separation limit to be increased from 17.5 to 20% titanium carbide. In the case of precipitation modification, the system has greater potential for both combustion and phase separation, and the structural constituents of the alloy are characterized by a smaller size and finer structure. We have proposed a sequence of chemical reactions involved in the modification by the precipitation mechanism, in which Co3O4 decomposition and subsequent release of active oxygen play a key role.
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This work was supported by the Russian Foundation for Basic Research, project no. 19-03-00088.
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Translated by O. Tsarev
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Zakharov, K.V., Andreev, D.E., Yukhvid, V.I. et al. General Aspects of the Combustion Synthesis of a Cobalt Alloy with Dispersion and Precipitation Modification. Inorg Mater 57, 727–732 (2021). https://doi.org/10.1134/S0020168521070165
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DOI: https://doi.org/10.1134/S0020168521070165