Dey, Arjun and Mukhopadhyay, Anoop Kumar and Gangadharan, S and Sinha, Mithilesh Kumar and Basu, Debabrata (2009) Characterization of Microplasma Sprayed Hydroxyapatite Coating. Journal of Thermal Spray Technology, 18 (4). pp. 578-592. ISSN 1059-9630

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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 similar to 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 similar to 0.6 MPa center dot m(0.5). From the nano-scratch experiments, the critical normal load at which localized microcracking led to delamination was measured to be similar to 00 mN.

Item Type:	Article
Uncontrolled Keywords:	Characterizations; Coating; Hydroxyapatite; Microplasma spraying
Subjects:	Ceramic-Metal Systems Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Ashok K Podder
Date Deposited:	21 Feb 2012 11:00
Last Modified:	21 Feb 2012 11:00
URI:	http://cgcri.csircentral.net/id/eprint/665

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