학술논문
Microstructure of Ultrafine-Grained Al2 O3 –ZrO2 Ceramics Produced by Two-Step Spark Plasma Sintering.
Document Type
Article
Author
Source
Subject
*MICROSTRUCTURE
*ISOTHERMAL temperature
*SPECIFIC gravity
*SINTERING
*ACTIVATION energy
*GRAIN
*CERAMICS
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Language
ISSN
0020-1685
Abstract
We have studied the effect of monoclinic ZrO2 additions (1.5, 5, and 10 vol %) on the shrinkage kinetics of submicron α-Al2O3 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 ZrO2 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. [ABSTRACT FROM AUTHOR]