Abstract
TiO2 was selected as effective sintering aid for pressureless sintering of Ti3AlC2 ceramics in this study. The addition of only 5 wt% TiO2 largely promotes the densification and nearly dense Ti3AlC2 ceramic was obtained by pressureless sintering at 1500 °C. Significant strengthening and toughening effects were observed with the addition of TiO2. High Vickers hardness, flexural strength and fracture toughness of 3.22 GPa, 298 MPa and 6.2 MPa m−1/2, respectively, were achieved in specimen pressureless sintered with 10 wt% TiO2. Additionally, the addition of 5 wt% TiO2 had no deleterious effect on the excellent oxidation resistance of Ti3AlC2 ceramic under 1200 °C water vapor atmosphere, while addition of 10 wt% TiO2 accelerates the oxidation rate by two orders of degree.
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