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Phase evolution and sinterability of lanthanum phosphate – Towards a below 600 °C Spark Plasma Sintering

Rousselle, Mélanie and Ansart, Florence and Hérisson de Beauvoir, Thomas and Fradet, Guillaume and Estournès, Claude Phase evolution and sinterability of lanthanum phosphate – Towards a below 600 °C Spark Plasma Sintering. (2021) Journal of the European Ceramic Society, 41 (14). 7261-7268. ISSN 0955-2219

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Official URL: https://doi.org/10.1016/j.jeurceramsoc.2021.07.014


Lanthanum phosphate, due to its interesting thermal and mechanical properties is a widely studied material for refractory applications. Sintering processes have already been proposed to densify this material and drive its microstructure. Inspired by recent progress on low temperature sintering, we investigate a low temperature Spark Plasma Sintering (LowT-SPS) using hydrated precursor. First, lanthanum phosphate thermal behaviour was studied using TGA/DTA and XRD analysis on various heat-treated powders. Their SPS behaviour were explored by in situ dilatometry measurements. As hydrated precursor showed a low temperature densification, samples were sintered at temperatures from 160 °C to 350 °C under 400 MPa. Even if dense and nano-scaled microstructures were obtained, a residual hydration was observed. Finally, a well densified and fine-grained monazite type lanthanum phosphate was obtained at 550 °C and under 200 MPa. Its mechanical properties are then compared to conventional and Spark Plasma Sintered materials.

Item Type:Article
HAL Id:hal-03351467
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
Agence Nationale de la Recherche Technologie - ANRT - CNRS - Safran Aircraft Engines
Deposited On:22 Sep 2021 11:26

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