Synthesis,properties and thermal decomposition of the Ta4AlC3 MAX phase |
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| Affiliation: | 1. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, 3001 Leuven, Belgium;2. SCK•CEN, Boeretang 200, 2400 Mol, Belgium;3. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;3. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 611756, China;1. University of Tennessee, Knoxville, TN 37996, USA;2. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;1. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, QLD, 4000, Australia;2. Department of Physics, University of Rajshahi, Rajshahi, 6205, Bangladesh;3. Department of Physics, Chittagong University of Engineering and Technology, Chittagong, 4349, Bangladesh;4. Institute for Future Environments, Queensland University of Technology, QLD, 4000, Australia;1. Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104, USA;1. School of Computing and Engineering, University of Huddersfield, Queensgate, HD1 3DH, Huddersfield, United Kingdom;2. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Sackville Street, M1 3NJ, Manchester, United Kingdom;3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States |
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| Abstract: | The present work describes a synthesis route for bulk Ta4AlC3 MAX phase ceramics with high phase purity. Pressure-assisted densification was achieved by both hot pressing and spark plasma sintering of Ta2H, Al and C powder mixtures in the 1200–1650 °C range. The phases present and microstructures were characterized as a function of the sintering temperature by X-ray diffraction and scanning electron microscopy. High-purity α-Ta4AlC3 was obtained by hot pressing at 1500 °C for 30 min at 30 MPa. The β-Ta4AlC3 allotrope was observed in the samples produced by SPS. The Young’s modulus, Vickers hardness, flexural strength and single-edge V-notch beam fracture toughness of the high-purity bulk sample were determined. The thermal decomposition of Ta4AlC3 into TaCx and Al vapour in high (˜10−5 mbar) vacuum at 1200 °C and 1250 °C was also investigated, as a possible processing route to produce porous TaCx components. |
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| Keywords: | MAX phases Hot pressing Spark plasma sintering Thermal Decomposition |
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