Properties of the Ti-C-H-Сu composites obtained by mechanosynthesis using organic media

M.A. Eryomina, S.F. Lomayeva, S.N. Paranin, S.V. Zayatz, V.V. Tarasov, I.S. Trifonov

Abstract

The composites of Ti-C-H-Cu system were obtained by mechanosynthesis in liquid carbon media (petroleum ether, xylene), followed by magnetic pulse compaction of the powders. Structural-phase composition was investigated and density, microhardness and wear resistance of the composites were determined.Composites of a Ti-C-H-Cu system were obtained by mechanosynthesis in liquid carbon media (petroleum ester, xylene) followed by magnetic pulse compaction of the powders at 500°C in vacuum with the pressure amplitude of about 1.5 GPa. The chosen proportion of the components (Ti, Cu) corresponded to the composition TiC (90 vol%) – Cu (10 vol%). In addition, composites containing Cr and / or Ni with the atomic ratio of concentrations Cu : (Cr,Ni) equal to 80 : 20 were obtained. The compacts obtained had the diameter of 10 mm and thickness of 3 to 5 mm. The structure and phase composition of the composites were studied and density, microhardness and wear resistance were determined. The composites processed had the density of 87 – 95 % of the theoretical value. The mechanosynthesis process in petroleum ester is not complete in 3h, since in the phase composition of compacts one observes, apart from intermetallic phase CiTi2 and titanium carbohydride Ti2CH0.6, a significant amount of the initial Ti. The composites exhibit a layered microstructure. Use of xylene for mechanosynthesis process of the same duration allows one to obtain two-phase composites Ti2CH0.6 + CuTi2. An increase of the duration of mechanical treatment up to 6 h leads to a formation of intermetallic CuTi in the phase composition of the composites obtained. Use of xylene allows one to obtain also 10 – 20 vol% of nonstoichiometric carbide TiC. The microhardness of about 5 GPa was obtained for all the composites studied. Abrasive wear of the composites is an order of magnitude lower than that of steel U13. Alloying with Ni and / or Cr leads to some decrease of wear resistance due to a decrease of the quantity of TiC phase.

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