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Characteristics of the nanostructures in thermal sprayed hydroxyapatite coatings and their influence on coating properties.

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Characteristics of the nanostructures in thermal sprayed hydroxyapatite coatings and their influence on coating properties.

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dc.contributor.author Li, H.
dc.contributor.author Khor, Khiam Aik.
dc.date.accessioned 2012-10-01T08:48:49Z
dc.date.available 2012-10-01T08:48:49Z
dc.date.copyright 2006
dc.date.issued 2012-10-01
dc.identifier.citation Li, H., & Khor, K. A. (2006). Characteristics of the nanostructures in thermal sprayed hydroxyapatite coatings and their influence on coating properties. Surface and Coatings Technology, 201(6), 2147-2154.
dc.identifier.issn 0257-8972
dc.identifier.uri http://hdl.handle.net/10220/8689
dc.description.abstract There are generally two methods for depositing nanostructured coatings, retaining the nanostructures from starting feedstock and forming novel nanostructures through quenching. The present study utilized spray-dried nanostructured hydroxyapatite (nSD-HA) feedstock for coating/splat deposition. The nanostructures were characterized by transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). Results revealed that the rod-shaped nano-grains in the starting HA particles (< 500 nm in length and 40–70 nm in diameter) encountered two major experiences: enlargement due to unmelt state and reorganization due to melting–solidification. The molten part of the particles results in formation of spherical nanosized particles with grain sizes of 30–110 nm. TEM observation of the HA splats demonstrates consistent nanostructures. The unmelted part of individual nSD-HA particles showed significantly enlarged grains along radial direction (< 550 nm in length and < 400 nm in diameter). In addition, individual hexagonal grains were observed in the HVOF coating made from 30 ± 10 μm powder. The grains have the size of < 250 nm in height and < 50 nm in side length and are perpendicular to the coating/substrate interface. The nanostructures within the coatings contribute to an increased Young's modulus with up to 60.11 GPa, however, they showed detrimental effect on adhesion of the coatings. In vitro cell culturing revealed marked attachment and proliferation of the osteoblast cells on the nanostructured coatings. However, the results suggest that the nanostructures possess less importance than the phases (preferably high content of crystalline HA) on enhancing the cell proliferation.
dc.language.iso en
dc.relation.ispartofseries Surface and coatings technology
dc.rights © 2006 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Surface and Coatings Technology, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/j.surfcoat.2006.03.024].
dc.subject DRNTU::Engineering::Materials::Nanostructured materials.
dc.title Characteristics of the nanostructures in thermal sprayed hydroxyapatite coatings and their influence on coating properties.
dc.type Journal Article
dc.contributor.school School of Mechanical and Aerospace Engineering
dc.identifier.doi http://dx.doi.org/10.1016/j.surfcoat.2006.03.024
dc.description.version Accepted version

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