Microstructure of Ultrafine-Grained Al2O3–ZrO2 Ceramics Produced by Two-Step Spark Plasma Sintering

— We have studied the effect of monoclinic ZrO 2 additions (1.5, 5, and 10 vol %) on the shrinkage kinetics of submicron α-Al 2 O 3 powder. Ceramic samples were prepared by two-step spark plasma sintering (SPS). It has been shown that the two-step SPS process (heating to the temperature correspondin...

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Bibliographic Details
Published in:Inorganic materials 2022-10, Vol.58 (10), p.1090-1097
Main Authors: Boldin, M. S., Popov, A. A., Shcherbak, G. V., Murashov, A. A., Nokhrin, A. V., Chuvil’deev, V. N., Smetanina, K. E., Tabachkova, N. Yu
Format: Article
Language:English
Subjects:
Aluminum oxide
Ceramic powders
Ceramics
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Microstructure
Sintering (powder metallurgy)
Spark plasma sintering
Specific gravity
Theoretical density
Ultrafines
Zirconium dioxide
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Summary:— We have studied the effect of monoclinic ZrO 2 additions (1.5, 5, and 10 vol %) on the shrinkage kinetics of submicron α-Al 2 O 3 powder. Ceramic samples were prepared by two-step spark plasma sintering (SPS). It has been shown that the two-step SPS process (heating to the temperature corresponding to 90% relative density and isothermal holding at this temperature) allows one to obtain ceramics with ultrafine-grained microstructure and high, near-theoretical density. Large ZrO 2 additions (10%) lead to an increase in the activation energy for SPS and a decrease in grain-boundary deformation rate in the isothermal holding step.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168522100041