Mechanism of liquid-phase interaction between nanocrystalline composition (VC0.40О0.53–C)–C and titanium nickelide

The article considers the possibility of binding free carbon existing in the VC_0.40O_0.53–C_free nanocrystalline composition to the carbide phase. This composition is obtained by plasma-chemical synthesis in a low-temperature nitrogen plasma. As a carbide former, titanium was used in the form of its nickelide TiNi, which has a melting point of 1310 °С. Experiments were carried out under vacuum sintering conditions involving the liquid phase at 1500 °C for 40 min. The data obtained in X-ray diffraction, scanning electron microscopy and energy-dispersive analysis were used to determine the phase composition and microstructural features of sintered samples. Liquid-phase interaction between the VC_0.40O_0.53–Cfree nanocrystalline composition and titanium nickelide, the content of which varied from 10 to 99 wt.%, was studied based on the results of experiments. It was shown that the content of C_free and VC vanadium carbide increases with the simultaneously increasing TiC content as the TiNi mass content increases in the range of 10–90 wt.%. With a further increase in the titanium nickelide content to 99 wt.%, Ti₃Ni₄ and Ni₃Ti nickelides are present after sintering. The content of free carbon increases to 88 wt.%, and the amount of TiC decreases to 5 wt.%. The data obtained in the course of the study were used to propose various schemes of processes occurring during the (VC_0.40O_0.53–C_free)–TiNi liquid phase sintering. In particular, sintering involving the liquid phase proceeds in three stages including TiNi melting, refractory base dissolution, its reprecipitation in the form of TiC_x and VC_x carbides, and cooling of the resulting composition. It should be noted that the mechanism of liquid-phase interaction during vacuum sintering involving the liquid phase was developed on the basis of the laws presented in the paper by M. Gumenik.

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