Three-Dimensional Printing of Nanolaminated Ti3AlC2 Toughened TiAl3–Al2O3 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, Shaanxi 710072, China; Department of Materials Science (Glass and Ceramics), University of Erlangen-Nuremberg, Erlangen, Germany; Centre for Advanced Materials and Processes, University of Erlangen-Nuremberg, Fuerth, Germany |
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| Abstract: | Nanolaminates with a layered M N +1AX N crystal structure (with M: transition metal, A: group element, X: carbon or nitrogen, and N =1, 2, 3) offer great potential to toughen ceramic composites. A ternary Ti3AlC2 carbide containing ceramic composite was fabricated by three-dimensional printing of a TiC+TiO2 powder mixture and dextrin as a binder. Subsequent pressureless infiltration of the porous ceramic preform with an Al melt at 800°–1400°C in an inert atmosphere, followed by reaction of Al with TiC and TiO2 finally resulted in the formation of a dense multiphase composite of Ti3AlC2–TiAl3–Al2O3. A controlled flaw/strength technique was utilized to determine fracture resistance as a function of crack extension. Rising R -curve behavior with increasing crack extension was observed, confirming the operation of wake-toughening effects on the crack growth resistance. Observations of crack/microstructure interactions revealed that extensive crack deflection along the (0001) lamellar sheets of Ti3AlC2 was the mechanism responsible for the rising R -curve behavior. |
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