A layered ternary carbide phase, Ti3AlC2, was synthesized by hot pressing from the starting materials of Ti, aluminum, and activated carbon at 1400°C for 2 h. Its composites were also fabricated through addition of micro-sized SiC and partially stabilized zirconia particulates to the pulverized Ti3AlC2 powders. The polycrystalline Ti3AlC2 ceramic obtained has a flexural strength of 172 MPa and a fracture toughness of 4.6 MPa·m1/2, respectively. This compound is relatively soft (Vikers hardness of 2.7 GPa) and exhibits good electrical conductivity with an electrical resistivity of 8.2 Ω·m. Both the Ti3AlC2/SiC and Ti3AlC2/ZrO2 composites are superior to the monolithic Ti3AlC2 ceramic in strength, fracture toughness, and micro-hardness.
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Document Type: Research Article
Department of Mechanics and Mechanical Engineering, CAS Key Laboratory for Mechanical Behavior and Design of Materials, School of Engineering Science, University of Science and Technology of China, Hefei 230026, Anhui, China
Publication date: April 1, 2007