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Determination of the Mechanical Properties of Plasma-Sprayed Hydroxyapatite Coatings Using the Knoop Indentation Technique

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Abstract

The microhardness and elastic modulus of plasma-sprayed hydroxyapatite coatings were evaluated using Knoop indentation on the cross section and on the top surface. The effects of indentation angle, testing direction, measurement location and applied load on the microhardness and elastic modulus were investigated. The variability and distribution of the microhardness and elastic modulus data were statistically analysed using the Weibull modulus distribution. The results indicate that the dependence of microhardness and elastic modulus on the indentation angle exhibits a parabolic shape. Dependence of the microhardness values on the indentation angle follows Pythagoras’s theorem. The microhardness, Weibull modulus of microhardness and Weibull modulus of elastic modulus reach their maximum at the central position (175 µm) on the cross section of the coatings. The Weibull modulus of microhardness revealed similar values throughout the thickness, and the Weibull modulus of elastic modulus shows higher values on the top surface compared to the cross section.

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Acknowledgments

Dr. F. Hasan would like to thank Swinburne University of Technology for providing a Swinburne University of Postgraduate Research Award (SUPRA) that enabled him to complete his PhD.

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Authors and Affiliations

  1. IRIS, Faculty of Science, Engineering & Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia

    Md. Fahad Hasan, James Wang & Christopher Berndt

  2. Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY, 11794, USA

    Christopher Berndt

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  1. Md. Fahad Hasan
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  2. James Wang
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  3. Christopher Berndt
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Correspondence to Md. Fahad Hasan.

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Hasan, M.F., Wang, J. & Berndt, C. Determination of the Mechanical Properties of Plasma-Sprayed Hydroxyapatite Coatings Using the Knoop Indentation Technique. J Therm Spray Tech 24, 865–877 (2015). https://doi.org/10.1007/s11666-015-0228-0

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  • DOI: https://doi.org/10.1007/s11666-015-0228-0

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