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Phase transformation of zirconia ceramics by hydrothermal degradation

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Title: Phase transformation of zirconia ceramics by hydrothermal degradation
Authors: Kawai, Yohei Browse this author
Uo, Motohiro Browse this author →KAKEN DB
Wang, Yong ming Browse this author
Kono, Sayaka Browse this author
Ohnuki, Somei Browse this author
Watari, Fumio Browse this author
Keywords: Zirconia
Phase transformation
Hydrothermal degradation
Issue Date: May-2011
Publisher: Japanese Society for Dental Materials and Devices
Journal Title: Dental Materials Journal
Volume: 30
Issue: 3
Start Page: 286
End Page: 292
Publisher DOI: 10.4012/dmj.2010-175
Abstract: Zirconia has found wide application in dentistry because of its high mechanical strength and superior esthetic properties. However, zirconia degradation caused by phase transformation occurring in a hydrothermal environment is of concern. In the present study, phase transformation and microstructure of tetragonal zirconia polycrystal partially stabilized with yttrium oxide (Y-TZP) and alumina-toughened zirconia (ATZ) sintered at different temperatures were estimated. On grazing angle X-ray diffraction analysis, ATZ showed less phase transformation to the monoclinic phase during hydrothermal treatment and this transformation appeared to occur within a few micrometers below the surface. At a higher sintering temperature the monoclinic phase content of ATZ was found to be lesser than that of Y-TZP, indicating that the alumina in ATZ was effective in suppressing hydrothermal degradation. Examination by transmission electron microscopy and studying of electron backscatter diffraction patterns indicated that grain growth in ATZ was slightly suppressed compared with that in Y-TZP at higher sintering temperatures. The present study demonstrated the effect of adding alumina to zirconia for suppressing hydrothermal degradation and studied the effect of this addition on grain growth in zirconia.
Rights: Copyright © 2011 The Japanese Society for Dental Materials and Devices
Type: article (author version)
Appears in Collections:歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 宇尾 基弘

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