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Near-surface in vitro studies of plasma sprayed hydroxyapatite coatings

Published online by Cambridge University Press:  05 March 2012

T. P. Ntsoane ,
M. Topic  and
R. Bucher
T. P. Ntsoane*
Affiliation:
Research and Development Division, NECSA Limited, P.O. Box 582, Pretoria, 0001, South Africa
M. Topic
Affiliation:
Department of Materials Research, iThemba Laboratory, P.O. Box 722, Somerset West, 7129, South Africa
R. Bucher
Affiliation:
Department of Materials Research, iThemba Laboratory, P.O. Box 722, Somerset West, 7129, South Africa
*
a)Author to whom correspondence should be addressed. Electronic mail: tshepo.ntsoane@necsa.co.za
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Abstract

Coatings of plasma sprayed hydroxyapatite (HAp), incubated in simulated body fluid for periods varying from 1 to 56 days, were characterized using conventional laboratory X rays. Quantitative phase analysis, employing TOPAS software, showed an opposite trend in the two main phases of the coating, viz., HAp and tetracalcium phosphate (TTCP). The former increased within the first 7 days of incubation whilst the latter decreased during the same period; both phases stabilized with further incubation. The crystallinity of the coatings exhibited a trend similar to that of HAp i.e., an increase in the early stages of incubation stabilization with further incubation. Results of residual stress determined with Bruker’s D8 Discover and analyzed with LEPTOS software, showed both the normal stress tensor components, σ11 and σ22, to be tensile, relaxing significantly in the early stages of incubation before stabilizing with further incubation.

Keywords

X-ray diffractionquantitative phase analysisRietveld refinementresidual stress
Type
Technical Articles
Information
Powder Diffraction , Volume 26 , Special Issue 2 , June 2011 , pp. 138 - 143
Copyright
Copyright © Cambridge University Press 2011

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