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Grain growth of titania to submillimeter sizes using water vapor-assisted sintering

Published online by Cambridge University Press:  02 October 2018

Takahiro Kozawa  and
Kazumichi Yanagisawa
Takahiro Kozawa*
Affiliation:
Joining and Welding Research Institute, Osaka University, Ibaraki, Osaka 567-0047, Japan; and Research Laboratory of Hydrothermal Chemistry, Faculty of Science and Technology, Kochi University, Kochi 780-8520, Japan
Kazumichi Yanagisawa
Affiliation:
Research Laboratory of Hydrothermal Chemistry, Faculty of Science and Technology, Kochi University, Kochi 780-8520, Japan
*
a)Address all correspondence to this author. e-mail: t-kozawa@jwri.osaka-u.ac.jp
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Abstract

Pressureless sintering is a simple and traditional processing method for producing dense ceramics by heating at a high temperature. The introduction of water vapor into this atmosphere can decrease the sintering temperature and accelerate grain growth. In this work, we report water vapor-assisted sintering of submicrometer titania (TiO2) powder. Dense TiO2 pellets with a relative density over 99% were obtained in 0.1 MPa of water vapor at a lower temperature than in air. The submicrometer particles (∼0.5 µm) grew to an average size of 181 µm after sintering at 1400 °C in water vapor, whereas the particle size obtained by sintering in air was 51 µm. Furthermore, we verified the incorporation of oxygen from water vapor into TiO2 by using isotopically labeled water (H218O). Water vapor-assisted sintering can potentially lead to the production of single crystal-like ceramics by a pressureless route and without any additives.

Keywords

sinteringgrain sizewater
Type
Invited Article
Information
Journal of Materials Research , Volume 34 , Issue 3: Focus Issue: Understanding Water-Oxide Interfaces to Harness New Processes and Technologies , 14 February 2019 , pp. 474 - 480
Copyright
Copyright © Materials Research Society 2018 

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