Synthesis of Layered-Ternary Ti₂AlC/Al₂O₃ Composites by an In Situ Reaction and Hot Pressing Sintering

Abstract:

Mo modified Ti₂A1C /Al₂O₃ composites were successfully fabricated from an elemental power mixture of Ti, Al, TiC and MoO₃ by an in situ reaction/hot pressing method. The reaction path and effect of the molar ratio of the initial materials on the phase composition were investigated in detail. The as-prepared materials are mainly composed of (Ti_1-xMo_x)₂AlC solid solutions, Al₂O₃, and a small amounts of the Mo rich compounds. It is found that the in situ formed fine Al₂O₃ particles tend to disperse on the matrix grain boundaries. Compared with the monolithic Ti₂A1C, (Ti,Mo)₂AlC/10 wt% Al₂O₃ composite possesses a fine grain sized structure. The Vickers hardness, flexural strength, fracture toughness, and compressive strength of the as composite are 4.75 GPa, 458 MPa, 6.03 MPa·m^1/2, 971 MPa, respectively.

• Periodical: Materials Science Forum (Volume 724)
• Pages: 315-318
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.724.315
• Online since: June 2012
• Authors: Jian Feng Zhu, Rui Juan Pan
• Keywords: Hot Pressing, Solid Solution, Ti₂AlC/Al₂O₃ Composites

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