Deposition of sol-gel derived hydroxyapatite-titania coatings on ti6al4v alloy used for medical implants
Keywords:
hydroxyapatite, titania, sol-gel,, Ti6Al4V, bone tissueAbstract
Calcium hydroxyapatite (HA) coatings are widely used for modifying of metal implants surface due to their chemical similarity to bone tissue and good biocompatibility to soft tissue. Besides, hydroxyapatite coatings limit toxic influence of metals. However deposition of HA coatings on titanium alloy directly, without any intermediate layer often leads to the formation of micro cracks either directly after deposition or during following implants operation under the influence of mechanical loading. This leads to deterioration of the implants biocompatibility used due to the penetration of ions through the microcracks of the base alloy coating, and as a consequence, decreases the bioactivity of HA coatings. In this paper a new method of deposition of hybrid hydroxyapatite - titania coatings proposed. Scanning electron microscopy and X-ray diffractometry have been used to study morphology and phase structure.
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