Accessible Requires Authentication Published by De Gruyter November 29, 2018

The grain growth in alumina compacts sintered under high pressure

Zeynep Taslicukur Ozturk and Nilgun Kuskonmaz

Abstract

In this study, alumina ceramics were produced with high density and nanograin size without additives from nano-size γ-Al2O3. The effects of sintering pressure (3 GPa and 7 GPa) and temperature (600 °C and 1 200 °C) on the grain size of sintered samples were studied. It was shown that high pressure increases the nucleation rate while reducing the growth rate of the transformed α phase. Pressure-assisted densification decreases grain size, so that nano-scale grains can be achieved in the sintered structure. The effect of various sintering conditions on grain growth in alumina was investigated during high-pressure sintering for better understanding of pressure and temperature effects on microstructural properties.


*Correspondence address, Assist. Prof. Dr. Zeynep Taslicukur Ozturk, Faculty of Engineering, Metallurgy and Materials Engineering, Istanbul Gedik University, Cumhuriyet Road İlkbahar Street No: 3 Kartal, Istanbul, 34876, Turkey, Tel.: +904445438(1186), Fax: +90(216)4528717, E-mail:

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Received: 2018-03-21
Accepted: 2018-07-25
Published Online: 2018-11-29
Published in Print: 2018-12-10

© 2018, Carl Hanser Verlag, München