Features of phase formation of composites based on MAX-phases of the TiH2-Al-C and TiH2-Si-C systems after thermal synthesis


  • O.V. Suprun Frantsevich Institute for Problems of Materials Science NAS of Ukraine, 3, Krzhizhanovskogo Str., Kyiv, 03142, Ukraine
  • G.A. Bagluk Frantsevich Institute for Problems of Materials Science NAS of Ukraine, 3, Krzhizhanovskogo Str., Kyiv, 03142, Ukraine
Keywords:
MAX-phase, ternary compound, thermal synthesis, titanium, intermetallic compound, titanium carbide X-ray phase analysis

Abstract

The results of an investigation of the features of phase formation of MAX phase materials after thermal synthesis from TiH2-Al-C and TiH2-Si-C powder mixtures were presented. Significant dependence of the phase composition of alloy on the temperature of thermal synthesis is shown. The x-ray diffraction pattern shown that for all initial mixtures during their heating process takes place formation of titanium carbide particles, ternary Ti2AlC carbide and intermetallic Ti3Al compound. Increasing the sintering temperature to 1300 °C leads to decreases the content of titanium carbide TiC and significant increases the content of Ti2AlC ternary compounds. After synthesis at 1400 °C, the base phase of the alloy becomes the Ti3AlC2 ternary compound. After research of the interaction of components of a powder charge of TiH2-Si-C system, it was revealed, that the main phase after synthesis at 1150 °C is titanium carbide. The ternary Ti3SiC2 and intermetallics Ti5Si4 and compound were also identified in the phase composition of the alloy. Increasing the sintering temperature to 1300 °C leads to decreases the content of titanium carbide TiC and increases the content of Ti2AlC ternary compounds. After synthesis at 1400 °C, in materials other than Ti3SiC2 main phase would be admixtures of TiC and Ti5Si3. A modified model thermal synthesis of ternary compounds of the Ti-Al-C system, which includes the melting of aluminum and its interaction with titanium at low-temperature stages of the process, formation of the Ti3Al intermetallic compound, formation titanium carbide grains as a result of interaction of the Al4C3 intermediate metastable phase with titanium or Ti3Al intermetallic compound and the synthesis of ternary Ti2AlC and Ti3AlC2 compounds as a result of interaction of the Ti3Al intermetallic compound with carbon and Ti2AlC with titanium carbide TiC is propose. It was established that formation of titanium-silicon carbide Ti-Si-C system proceeds in two stages: through the formation of an eutectic melt TiSi2-Si and due to the interaction of titanium carbide with TiSi2.

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Published
2017-12-30
How to Cite
Suprun, O., & Bagluk, G. (2017, December 30). Features of phase formation of composites based on MAX-phases of the TiH2-Al-C and TiH2-Si-C systems after thermal synthesis. Ceramics: Science and Life, (4(37), 16-24. https://doi.org/10.26909/csl.4.2017.3