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Characterization of Microplasma Sprayed Hydroxyapatite Coating

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Abstract

Microplasma sprayed (MIPS) HAP coatings on SS316L substrates were characterized by x-ray diffraction, Fourier transformed infrared spectroscopy, optical microscopy, scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), atomic force microscopy and image analysis. The coating showed a high degree of crystallinity ~92%, a high porosity level of 20 vol.% and a moderate bonding strength of about 13 MPa. The displacement controlled three-point bend tests and associated results of optical microscopy indicated that crack deflection, crack branching, and also local crack bridging occurred during crack propagation in the coating. The nano-hardness (H) and Young’s modulus (E) of the MIPS-HAP coatings as measured by nanoindentation technique were about 6 and 92 GPa, respectively. The fracture toughness (K ic) of the coating was ~0.6 MPa·m0.5. From the nano-scratch experiments, the critical normal load at which localized microcracking led to delamination was measured to be ~400 mN.

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Acknowledgments

The authors are grateful to Director, Central Glass and Ceramic Research Institute (CGCRI), Kolkata, for his kind permission to publish this paper and to Dr. D. K. Bhattacharya, Head, Analytical Facility Division of CGCRI, for his kind encouragement during the course of this work. One of the authors (A.D.) also sincerely acknowledges the support and encouragements received from Prof. N. R. Bandyopadhyay of the School of Materials Science and Engineering, Bengal Engineering and Science University (BESU), Shibpur. In addition, the authors appreciate the infrastructural support received from all colleagues and particularly those received from the colleagues of the Mechanical Test Section and Bio Ceramics and Coating Division at CGCRI. Finally, the authors gratefully acknowledge financial support received from DST-SERC (Project No: GAP 0216) and CSIR (Network Project TAREMAC No: NWP 0027).

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Dey, A., Mukhopadhyay, A.K., Gangadharan, S. et al. Characterization of Microplasma Sprayed Hydroxyapatite Coating. J Therm Spray Tech 18, 578–592 (2009). https://doi.org/10.1007/s11666-009-9386-2

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