Abstract
TiAl matrix composites with different TiC0.4 content were prepared by spark plasma sintering. The microstructure, mechanical properties and tribological properties of TiAl matrix composites with different TiC0.4 content and Ti3SiC2 were studied systematically. The results showed that the density, hardness and compressive strength of the composites increase with the increase of TiC0.4 content. The density of the material was 3.98–4.00 g/cm3, the hardness was 4.3–5.1 GPa, and the compressive strength was 757–890 MPa. The tribological behavior and mechanical properties at room temperature (RT) and 500 °C were investigated, and the wear mechanism was discussed. TiAl matrix composites with 10 wt% Ti3SiC2 and 15 wt% TiC0.4 have the best tribological properties. The friction coefficients at RT and 550 °C were 0.500 and 0.474 respectively, and the wear rates were 0.12 mg·m−1 and 0.017 mg·m−1, respectively. In RT, the small groove formed by the wear between the hard particles of TiAl matrix composites and the friction surface in the friction process. The Ti2AlC formed by the addition of TiC0.4 plays the role of wear resistance.
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