Changes in phases and crystallinity of plasma-sprayed hydroxyapatite coatings under heat treatment: a quantitative study

Journal of Biomedical Materials Research
B C WangC Y Yang

Abstract

With three kinds of plasma-sprayed hydroxyapatite coatings (HACs) prepared, the objectives of this study were (1) to establish the calibration methods for quantitatively measuring the concentration of impurity phases and the degree of crystallinity of the HACs, and (2) to explore the effects of postheat treatments at various temperatures in vacuo on the changes of phases and crystallinity of the HACs. By the internal standard method used, the concentrations of impurity phases, such as alpha-TCP, beta-TCP, and TP, of the assprayed HACs were significantly higher than those measured by the direct intensity-ratio method, and the CaO phase was lower than the direct intensity-ratio method. When the HACs were heat treated in the temperature interval 630-850 degrees C, the concentrations of impurity phases obviously decreased, and the coating crystallinity apparently increased. After annealing at 850 degrees C, an HAC consisting of at least 95% crystallinity with few impurity phases was obtained. As the annealing temperatures in the interval 850-1000 degrees C were applied, however, the HA phase seriously decomposed, resulting in the appearance of a large number (higher than 20 wt%) of impurity phases in the HACs. This work suggests th...Continue Reading

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Citations

Jul 1, 1997·Journal of Biomedical Materials Research·C Y YangG L Chang
Jan 15, 2000·Journal of Biomedical Materials Research·I BaltagN Ito
Nov 26, 1999·Journal of Biomedical Materials Research·E GirardinA Lodini
Aug 16, 2001·Journal of Biomedical Materials Research·L SunA Kucuk
Mar 9, 2005·Journal of Materials Science. Materials in Medicine·R HurteauxD Laurent-Maquin
Oct 15, 2008·Journal of Materials Science. Materials in Medicine·Hsueh-Chuan HsuWen-Fu Ho
Oct 8, 2003·Biomaterials·Qiyi ZhangXingdong Zhang
Mar 23, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Christopher J TredwinJonathan C Knowles
Apr 26, 2008·Journal of Biomedical Materials Research. Part a·Juliane IsaacJean-Michel Sautier
Feb 8, 2008·Journal of Biomedical Materials Research. Part a·S M A Shibli, Suja Mathai
Jun 6, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Micah KellyFelicity de Cogan
Jan 13, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Alan M SmithLiam M Grover
Sep 14, 2016·Journal of Functional Biomaterials·A M VilardellJ M Guilemany
Apr 5, 2001·Journal of Biomedical Materials Research·Y HanJ Lu
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May 9, 2021·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Srikant Tiwari, Suryanarayan B Mishra
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Jan 25, 2005·Journal of Biomedical Materials Research. Part a·R RohanizadehA Bendavid

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