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Rapid Communication | Open Access

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

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
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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.

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Journal of Advanced Ceramics
Pages 153-158
Cite this article:
ZHANG L, SHAO L, LI L, et al. An abnormal displacement change during holding period in nanoindentation tests on zirconia dental ceramic. Journal of Advanced Ceramics, 2016, 5(2): 153-158. https://doi.org/10.1007/s40145-016-0184-2

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Received: 28 February 2016
Accepted: 07 March 2016
Published: 14 June 2016
© The author(s) 2016

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/ by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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