Study of high-temperature forming of TiC-based metal-ceramic composite materials with a metal matrix

When obtaining a finished product with minimal porosity using compaction methods, it is necessary to evaluate the material’s formability. Metal-ceramic materials, especially refractory ones, are characterized by a very narrow temperature-time interval in which they possess the ability for plastic deformation. The paper presents the results of a study on the high-temperature forming of composite metal- ceramic materials based on TiC with a metal matrix. A high-alloy steel powder Kh18N15M was used as the metal matrix in an amount of 10 – 70 wt.%. Powder materials (titanium and carbon black) were used in the synthesis of the metal-ceramic composite, which form titanium carbide through direct exothermic interaction. The formability of the synthesized material was determined using the free SHS-compression method. The criterion was the deformation degree — the ratio of the difference between the areas of the deformed sample and the initial workpiece to the area of the deformed sample. It was found that with an increase in the amount of metal binder from 10 to 60 wt.%, the combustion temperature and rate decrease by 1.6 and 23 times, respectively, and with a metal binder content of 70 wt.%, synthesis is impossible. It is shown that, regardless of the metal matrix content in the material, its structure and phase composition do not change qualitatively. The obtained results can be used to improve the methodology for synthesizing compact composite materials based on TiC with a Kh18N15M metal matrix to achieve minimal porosity.

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