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An abnormal displacement change observed during the holding period in nanoindentation tests on a zirconia dental ceramic was reported in this paper. It was found that, at the initial stage of the holding period, the measured displacement versus time curves were similar in shape with the typical indentation creep curve reported in previous studies. As the holding lasted for long time, however, an evident reduction in displacement was observed for tests with high loading rate, implying that another unknown process, which might result in a decrease in displacement, would co-exist with creep during holding period. Elastic recovery was suggested to be one of the possible sources for such a displacement reduction. An empirical method was also proposed to eliminate the effect of this displacement reduction on the determination of hardness and Young’s modulus.


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An abnormal displacement change during holding period in nanoindentation tests on zirconia dental ceramic

Show Author's information Lixian ZHANGaLongquan SHAObLei LIcDanyu JIANGc( )
Department of Prosthodontics, the First Hospital of Yunnan Province, Kunming 650000, China
Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
Analysis and Testing Center for Inorganic Materials, the State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai 200050, China

Abstract

An abnormal displacement change observed during the holding period in nanoindentation tests on a zirconia dental ceramic was reported in this paper. It was found that, at the initial stage of the holding period, the measured displacement versus time curves were similar in shape with the typical indentation creep curve reported in previous studies. As the holding lasted for long time, however, an evident reduction in displacement was observed for tests with high loading rate, implying that another unknown process, which might result in a decrease in displacement, would co-exist with creep during holding period. Elastic recovery was suggested to be one of the possible sources for such a displacement reduction. An empirical method was also proposed to eliminate the effect of this displacement reduction on the determination of hardness and Young’s modulus.

Keywords:

zirconia, nanoindentation, displacement, elastic recovery
Received: 28 February 2016 Accepted: 07 March 2016 Published: 14 June 2016 Issue date: June 2021
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Publication history

Received: 28 February 2016
Accepted: 07 March 2016
Published: 14 June 2016
Issue date: June 2021

Copyright

© The author(s) 2016

Acknowledgements

This work was supported by the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure, China.

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