Advanced Microstructural Study of Suspension Plasma Sprayed Hydroxyapatite Coatings |
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Authors: | Harry Podlesak Lech Pawlowski Romain d’Haese Jacky Laureyns Thomas Lampke Severine Bellayer |
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Affiliation: | 1.Chemnitz University of Technology,Chemnitz,Germany;2.Ecole Nationale Supérieure de Chimie de Lille,Villeneuve d’Ascq,France;3.University of Lille 1,Villeneuve d’Ascq,France |
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Abstract: | Fine, home-synthesized, hydroxyapatite powder was formulated with water and alcohol to obtain a suspension used to plasma
spray coatings onto a titanium substrate. The deposition process was optimized using statistical design of 2
n
experiments with two variables: spray distance and electric power input to plasma. X-ray diffraction (XRD) was used to determine
quantitatively the phase composition of obtained deposits. Raman microscopy and electron probe microanalysis (EPMA) enabled
localization of the phases in different positions of the coating cross sections. Transmission electron microscopic (TEM) study
associated with energy-dispersive x-ray spectroscopy (EDS) enabled visualization and analysis of a two-zone microstructure.
One zone contained crystals of hydroxyapatite, tetracalcium phosphate, and a phase rich in calcium oxide. This zone included
lamellas, usually observed in thermally sprayed coatings. The other zone contained fine hydroxyapatite grains that correspond
to nanometric and submicrometric solids from the suspension that were agglomerated and sintered in the cold regions of plasma
jet and on the substrate. |
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