Paper Title:
Comparison between the SBF Response of Hydroxyapatite Coatings Deposited Using both a Plasma-Spray and a Novel Co-Incident Micro-Blasting Technique
  Abstract

This paper reports on the response of hydroxyapatite (HA) coatings, fabricated using two deposition technologies, to immersion in simulated body fluid (SBF). The deposition methods used were: plasma spray, a commercial standard, and CoBlast, a novel low temperature microblast technique. In the case of the latter, HA coatings are deposited by simultaneous blasting HA and abrasive powders concentrically at a metallic substrate, resulting in a thin layer of HA (approx. 2.5 µm thick). Groups of the CoBlast and plasma spray HA coatings were immersed in 7 ml of SBF solution for 1, 2, 4, 7, 14 and 28 days, and were subsequently removed and examined for any alterations caused by the SBF solution. It was noted from this study that the CoBlast HA coatings appeared to undergo a two step calcium phosphate recrystallisation process; initial homogenous nucleation and subsequent heterogeneous nucleation. Conversely recrystallisation on the plasma spray coatings appeared to proceed largely through a heterogeneous nucleation process. Two factors that may influence the differences in HA recrystallisation is the presence of amorphous HA resulting in rapid dissolution, and/or the significantly lower surface area (roughness) offered to the SBF solution by the CoBlast coatings. The interpretation of recrystallisation mechanisms from this preliminary study is limited however by the differences in coating morphology and thickness (27 versus 2 µm) for the plasma spray and CoBlast HA coatings respectively.

  Info
Periodical
Key Engineering Materials (Volumes 493-494)
Main Theme
Edited by
Eyup Sabri Kayali, Gultekin Goller and Ipek Akin
Pages
483-488
DOI
10.4028/www.scientific.net/KEM.493-494.483
Citation
J.N. Barry, D. P. Dowling, "Comparison between the SBF Response of Hydroxyapatite Coatings Deposited Using both a Plasma-Spray and a Novel Co-Incident Micro-Blasting Technique", Key Engineering Materials, Vols. 493-494, pp. 483-488, 2012
Online since
October 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Qi Yi Zhang, X. Liu, J. Chen, X. Zhang
89
Authors: Edwin van der Wal, Joop G.C. Wolke, John J. Jansen, Arjen M. Vredenberg
699
Authors: Marco A. Lopez-Heredia, Pierre Weiss, Pierre Layrolle
Abstract:Calcium phosphates coatings were deposited onto titanium discs via en electrodeposition method. Discs were blasted with calcium phosphate...
549
Authors: G. Deniz, Saduman Sen, Ugur Sen
Abstract:In this work, some surface properties of AISI M2 steel were improved by a thermoreactive deposition process. Gas nitriding was realized on...
219
Authors: Xin Bo Xiong, Xie Rong Zeng, Chun Li Zhou
Abstract:Calcium phosphate coatings were deposited on H2O2-treated carbon/carbon composites by ultrasonicated induction heating (UIH) method under...
1763