Characteristics and Sinterability of Ceria Stabilized Zirconia Nanoparticles Prepared by Chemical Methods

Janis GRABIS, Dzidra JANKOVIČA, Ints ŠTEINS, Māra LUBĀNE, Inta SĪPOLA

Abstract


Microwave assisted and molten salts synthesis were extended for preparation of ceria (10 mol%; 15 mol%) stabilized zirconia and their parameters and sinterability were compared with that of particles prepared by the sol-gel combustion method. As-prepared powders by using microwave assisted and sol-gel combustion synthesis contained single tetragonal ZrO2 phase but powders prepared by molten salts combustion method contained two ceria-stabilized tetragonal phases with different content of ceria. The crystallite size of the as-prepared zirconia phases was in the range of 3.2 9.4 nm and the average particles size is in the range of 7.6 24.6 nm depending on the synthesis method. Additional calcination of the powders up to 1000 °C led to increase of crystallite size in the range of 19 25 nm and decrease of specific surface area in the range of 18 21 m2/g and partial formation of monoclinic phase of ZrO2. Bulk materials with fine-grained microstructure (0.8 1.6 µm) and density in the range of 95.2 97.2 % were obtained by spark plasma sintering at 1280 1310 °C during 3 min. Nanoparticles prepared by microwave assisted synthesis showed better sinterability and higher density.

DOI: http://dx.doi.org/10.5755/j01.ms.24.3.18288


Keywords


zirconia; ceria; synthesis of nanoparticles; spark plasma sintering

Full Text: PDF

Print ISSN: 1392–1320
Online ISSN: 2029–7289