Nanoindentation study of microplasma sprayed hydroxyapatite coating |
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| Authors: | A Dey AK Mukhopadhyay S Gangadharan MK Sinha D Basu NR Bandyopadhyay |
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| Affiliation: | 1. Bio-Ceramics and Coating Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India;2. Mechanical Test Section, Analytical Facility Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India;3. School of Materials Science and Engineering, Bengal Engineering and Science University, Shibpur, Howrah 711 103, India |
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| Abstract: | The microplasma sprayed (MPS) hydroxyapatite (HAP) coating on surgical grade SS316L, is an emerging material for bio-ceramic based implant application involving higher reliability. For this purpose, a 200 μm thick MPS-HAP coating was developed on SS316L substrate and characterized by XRD, SEM and FE-SEM techniques. The local mechanical properties of the coating, e.g. nano-hardness and Young's modulus were evaluated by nanoindentation technique carried out with a Berkovich indenter at various depths in the range of about 170–3000 nm on a polished top surface. The characteristic values of nano-hardness (1.5–5 GPa) and Young's modulus (∼60–100 GPa) obtained through the application of Weibull statistics to the experimentally measured data revealed a strong indentation size effect (ISE). Attempts were made to explain the genesis of ISE on the basis of some existing and some new concepts. |
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| Keywords: | A Films C Mechanical properties C Hardness E Biomedical applications |
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