Abstract
The effect of an additive of 0.5 wt % of zirconium oxide on the kinetics of electropulse plasma sintering (EPS) of submicron and micron α-Al2O3 powders. Al2O3–0.5% ZrO2 compositions were obtained by mixing Al2O3 powders in a planetary mill with grinding media from stabilized zirconium oxide. The activation energy of EPS was estimated using the Yang–Cutler model. It is shown that the density and average grain size in ceramics sintered from submicron Al2O3 powders are significantly affected by the nonequilibrium state of the interfaces formed as a result of the transformation of the amorphous phase present on the particle surface during EPS. The grain size and density of ceramics Al2O3–0.5% ZrO2, sintered from micron powders are significantly affected by the coalescence of ZrO2 particles.
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ACKNOWLEDGMENTS
The study by transmission electron microscopy was performed on the equipment of the Core Facility Center “Materials Science and Metallurgy” of National University of Science and Technology “MISiS”, project no. 075-15-2021-696 of the Ministry of Education and Science of Russia.
Funding
This work was supported by the Russian Science Foundation, grant no. 20-73-10113.
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Boldin, M.S., Popov, A.A., Murashov, A.A. et al. Investigation of the Effect of a Small Addition of ZrO2 on the Density and Growth of Grains of Fine-Grained Aluminum Oxide. Tech. Phys. 67, 570–580 (2022). https://doi.org/10.1134/S1063784222080035
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DOI: https://doi.org/10.1134/S1063784222080035