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Ceramic Composites Based on Lanthanum Orthophosphate and Alumina: Preparation and Properties

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Abstract

An original approach to synthesis of nanosized (1 – x)LaPO4·nH2O–xAl(OH)3 precursor powders for (1 – x)LaPO4–xAl2O3 ceramic composites preparation was considered. Sol-gel synthesis was carried out separately using reverse flocculation of components. Thermal behavior of precursor powders was studied by DSC/TG. Ceramic composites with microhardness up to 30‒40 GPa were obtained by pre-heat treatment of powders and subsequent step wise sintering in the 1000–1600°C temperature range. The fracture surface of ceramic samples at different sintering temperatures was examined using electron microscopy. Ceramic samples exhibited low thermal conductivity at various temperatures and open porosity 3‒5%. Chemical stability of 0.8LaPO4–0.2Al2O3 sample was studied by leaching experiment in a solution of a mixture of NaCl and Na2SO4 salts. The resulting set of properties of (1 – x)LaPO4–xAl2O3 ceramic composites made it possible to offer these materials as heat barriers for rotors in high-speed micro gas turbines, and as ceramic matrices for immobilization of nuclear waste.

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ACKNOWLEDGMENTS

The authors thank the Senior Lecturer of the St. Petersburg State Institute of Technology (SPSIT) Andrey Akatov for his assistance in conducting experiments partially performed at the Department of Engineering Radioecology and Radiochemical Technology.

The authors wish also thank Irina Protasova and Maxim Kovalev for some research with the use of the equipment belonging to LLC “MELYTEC”, Russia, the largest dealer of research equipment and services.

Funding

The work was performed with the financial support of the Russian Foundation for Basic Research (Project no. 18-03-00488-a) and under the budget program of the Institute of Silicate Chemistry of RAS with the support of the Ministry of Education and Science of the Russian Federation (no. 0081-2022-0008).

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Authors and Affiliations

  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    L. P. Mezentseva, A. V. Osipov, V. L. Ugolkov, I. Yu. Kruchinina, P. I. Ivanova, T. V. Khamova & A. S. Lubimtsev

  2. Saint-Petersburg Electrotechnical University “LETI”, 197376, St. Petersburg, Russia

    I. Yu. Kruchinina

Authors
  1. L. P. Mezentseva
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  2. A. V. Osipov
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  3. V. L. Ugolkov
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  4. I. Yu. Kruchinina
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  5. P. I. Ivanova
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  6. T. V. Khamova
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  7. A. S. Lubimtsev
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Correspondence to L. P. Mezentseva.

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Mezentseva, L.P., Osipov, A.V., Ugolkov, V.L. et al. Ceramic Composites Based on Lanthanum Orthophosphate and Alumina: Preparation and Properties. Glass Phys Chem 48, 219–231 (2022). https://doi.org/10.1134/S1087659622030075

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