Abstract
A method for fabrication of ternary compound Ti 3 AlC 2 powder by pressureless calcining (PC) technique was developed. Powders of Ti, Al and TiC were mixed as staring materials. The effects of calcining temperature and aluminum content on the purity of Ti 3 AlC 2 were discussed. The reaction mechanism and the microstructure evolution of Ti 3 AlC 2 prepared at different temperatures were investigated by X-ray diffraction, field emission scanning electron microscopy and high resolution transmission electron microscopy. Results indicate that the single-phase polycrystalline Ti 3 AlC 2 powders are obtained at 1300 °C, which possesses a typical laminated structure, and the best molar ratio of raw Ti/Al/TiC materials is 1:1.2:2. The bulk samples sintered by hot pressing were from the Ti 3 AlC 2 powders. After hot pressing of different temperatures, the fully dense bulk Ti 3 AlC 2 shows the best properties when prepared at 1300 °C. The density of bulk Ti 3 AlC 2 reaches to 99.9%. The average Vickers hardness is around 5.7 GPa, and the maximum flexural strength is over 630 MPa. Finally the strengthening mechanism of the bulk Ti 3 AlC 2 was also proposed.
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