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Synthesis, properties and thermal decomposition of the Ta4AlC3 MAX phase
Journal article   Open access

Synthesis, properties and thermal decomposition of the Ta4AlC3 MAX phase

Matteo Griseri, Bensu Tunca, Thomas Lapauw, Shuigen Huang, Lucia Popescu, Michel W. Barsoum, Konstantina Lambrinou and Jozef Vleugels
Journal of the European Ceramic Society, v 39(10), pp 2973-2981
01 Aug 2019
DOI: https://doi.org/10.1016/j.jeurceramsoc.2019.04.021
url
https://lirias.kuleuven.be/handle/123456789/637284View
Accepted (AM)Open Access (License Unspecified),  Open

Abstract

Materials Science Materials Science, Ceramics Science & Technology Technology
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 degrees 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 alpha-Ta4AlC3 was obtained by hot pressing at 1500 degrees C for 30 min at 30 MPa. The beta-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 TaC and Al vapour in high ((similar to)10(-5) mbar) vacuum at 1200 degrees C and 1250 degrees C was also investigated, as a possible processing route to produce porous TaCx components.

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Materials Science, Ceramics
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