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Comparison of structure and morphology of hydroxyapatite films obtained by sol-gel and RF PECVD methods

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In the recent years, increasing number of applications of hydroxyapatite (HAP) layers as implant coatings have been observed. Due to its chemical composition, similar to that of natural bones, HAP is highly valued by the medical environment. The HAP layer causes the implant to integrate faster into surrounding tissues [1]. Additionally, it is a layer limiting the penetration of metal ions to organism, and preventing the immune system response. A number of methods can be used to produce biocompatible coatings on metals for biomedical applications: high temperature plasma-spraying, electrophoretic deposition, laser deposition, micro-arc techniques, magnetron sputtering and sol-gel techniques [2÷9]. However, each method has its own limitations, often caused by low adhesion strength to the substrate and also by difficulties with controlling the phase composition of the coating during the deposition. In this work HAP layers were deposited by sol-gel method which provided good control of film parameters, and by a new PE RFCVD method. Experimental procedure In sol-gel method, the calcium-phosphate sol was prepared by dissolving Ca(NO3)2⋅4H2O and (C2H5O)3PO in ethanol. Next, the solutions were mixed and aged for 15 hours at 60°C. The HAP layers were deposited on samples of AISI 316L stainless steel and silicon wafers by dip-coating method. Samples were withdrawn from sol with constant speed of 35 mm/min and annealed in air at 500°C[...]

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