Near-surface in vitro studies of plasma sprayed hydroxyapatite coatings

作者：Ntsoane T P^*; Topic M; Bucher R

来源：Powder Diffraction, 2011, 26(2): 138-143.

DOI：10.1154/1.3583181

• X-ray diffraction
• quantitative phase analysis
• Rietveld refinement
• residual stress

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, sigma(11) and sigma(22), to be tensile, relaxing significantly in the early stages of incubation before stabilizing with further incubation.

• 出版日期2011-6