Near-Net-Shape Fabrication of Ti3AlC2-Based Composites |
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| Authors: | Xiaowei Yin Nahum Travitzky Peter Greil |
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| Affiliation: | National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China; Department of Materials Science (Glass and Ceramics), University of Erlangen-Nurenburg, Erlangen 91058, Germany; Center for Advanced Materials and Processes, University of Erlangen-Nuremberg, Fuerth, Germany |
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| Abstract: | A porous ceramic preform was fabricated by printing a powder blend of TiC, TiO2, and dextrin. The presintered preforms contained a bimodal pore size distribution with intra-agglomerate pores ( d 50≈0.7 μm) and inter-agglomerate pores ( d 50≈30 μm), which were subsequently infiltrated by aluminum melt spontaneously in argon above 1050°C. A redox reaction at 1400°C resulted in the formation of dense Ti–Al–O–C composites mainly composed of Ti3AlC2, TiAl3, Al, and Al2O3, which attained a bending strength of 320 MPa, a Young's modulus of 184 GPa, and a Vicker's hardness of 2.5 GPa. |
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