Synthesis, properties and thermal decomposition of the Ta4AlC3 MAX phase

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  • KUL - Katholieke Universiteit Leuven

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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.

Details

Original languageEnglish
Pages (from-to)2973-2981
Number of pages9
JournalJournal of the European Ceramic Society
Volume39
Issue number10
DOIs
StatePublished - 7 Apr 2019

Keywords

  • MAX phases, Ta4AlC3, Hot pressing, Spark plasma sintering, Thermal, Decomposition

ID: 5085252