Regularities of Reactions of Titanium Carbonitrides
and Oxycarbides with Nickel

V. A. Zhilyaev^a,* and E. I. Patrakov^b,**

^aInstitute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences,
ul. Pervomaiskaya 91, Yekaterinburg, 620990 Russia

^bMiheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences,
ul. S. Kovalevskoi 18, Yekaterinburg, 620990 Russia

*e-mail: zhilyaev@ihim.uran.ru

**e-mail: patrakov@imp.uran.ru

Received August 14, 2013; in final form October 24, 2013; accepted for publication November 11, 2013

Abstract—Specific features and regularities of reactions of titanium carbide alloyed over the sublattice of non-
metals (N, O) with the nickel melt are analyzed. It is established that the partial substitution of carbon in TiC
by nitrogen decreases its dissolution rate in nickel and increases the degree of process incongruence
(thetransfer of carbon into the melt is preferential compared with titanium). The concentration dependence of
the dissolution rate of TiC_xN_z in nickel changes its sign to the opposite one compared with approaching the sys-
tem to equilibrium. Titanium carbonitride is not recrystallized through the nickel solution as the only phase, and
mainly its carbide component is subjected to recrystallization. It is revealed that the partial substitution of car-
bon in TiC to oxygen increases its dissolution rate in nickel. The dissolution of oxycarbide TiC_0.6O_0.4 in nickel
is accompanied by the gradual loss of its carbon until titanium monoxide is formed and by its further dispro-
portionation. The peculiarity of the interaction mechanism of titanium oxycarbides with the nickel melt is deter-
mined by reaction [C] + [O] = CO in the liquid phase.

Keywords: titanium carbonitrides and oxycarbides, nickel, interaction, reaction, microstructure

DOI: 10.3103/S1067821216010144

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