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Crystallinity and structural changes in HA plasma-sprayed coatings induced by cyclic loading in physiological media

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Abstract

In this study hydroxyapatite plasma-sprayed Ti-6Al-4V was characterized by X-ray diffraction (XRD) after being cyclically loaded, while immersed in two different testing environments: Hank's balanced salt solution (HBSS) and an isotonic saline solution (0.15 m NaCl). An original method was developed to test these systems under cyclic bending, while immersed in the testing solution. The crystallinity of the coating was calculated, before and after testing. Crystallinity changes were related to coating dissolution rates, measured by atomic absorption spectroscopy (AAS) and by a photocolourimetric method using ascorbic acid. Structural changes induced either by the plasma-spraying procedure or due to corrosion-fatigue tests, namely a preferential dissolution of the coating's amorphous phase, were also found in X-ray diffraction patterns. Long-term immersion tests, without any applied load, were carried out for assessing cyclic loading effects. An immersion for 2 years in static conditions was found to be equivalent to a cyclic test of 27.8 h in the same solution, as measured by the changes on the coating structure and by the amount of coating material lost to the solution.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, FEUP, University of Porto, Rua dos Bragas, 4099, Porto Codex, Portugal

    R. L. Reis & F. J. Monteiro

  2. INEB-Instituto de Engenharia Biomédica, Praça do Coronel Pacheco 1, 4050, Porto, Portugal

    R. L. Reis & F. J. Monteiro

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  1. R. L. Reis
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  2. F. J. Monteiro
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This paper was accepted for publication after the 1995 Conference of the European Society of Biomaterials, Oporto, Portugal, 10–13 September.

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Reis, R.L., Monteiro, F.J. Crystallinity and structural changes in HA plasma-sprayed coatings induced by cyclic loading in physiological media. J Mater Sci: Mater Med 7, 407–411 (1996). https://doi.org/10.1007/BF00122009

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