Synthesis, properties and thermal decomposition of the Ta4AlC3 MAX phase

Matteo Griseri, Bensu Tunca, Lapauw Thomas, Shuigen Huang, Lucia-Ana Popescu, Michel W. Barsoum, Konstantza Lambrinou, Jozef Vleugels

    Research outputpeer-review


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

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