| Abstract [eng] |
The need for better health care is constantly arising to achieve a better quality of life and an aging population. As a result, there is a need for bone implants, parts of bone implants and dental implants. Metal implants are widely used in medicine due to their unique mechanical properties and durability. Calcium hydroxyapatite is one of the major constituents of bone tissue, making the metal coated with the CHAp layer much better in terms of biocompatibility, osteointegration and biological adhesion with surrounding tissues. Biocompatibility is particularly important because the composition of the implant can cause an inflammatory reaction in the human body. Complications usually occur during implant corrosion, wear or fracture. The aim of this master 's thesis was to coat calcium hydroxyapatite (CHAp) coatings on silicon and titanium substrates by low – temperature sol – gel method, characterize the structure, morphology and corrosive behavior of coated coatings in that Hanks' salt solution by structural and electrochemical methods. The silicon and titanium substrates were first coated with CaCO3 by a spin coating method and then exposed to 1 M Na2HPO4 for 28 days at 80 ° C to form CHAp. Structure and morphology of CHAp coatings was evaluated by X-ray diffraction analysis, FTIR, Raman spectroscopy, SEM, 3D optical profilometer methods. CHAp coating was found to form on the silicon substrate and on the titanium substrate – CHAp with Na2HPO4 impurities. SEM and 3D optical microscopy methods showed that the CHAp coatings are uneven, porous, coarse-grained and with large height fluctuations. It has been observed that the use of titanium substrates results in a more uniform coating of calcium hydroxyapatite than the use of silicon substrates. The corrosive behavior of CHAp coatings on a titanium substrate was also evaluated by electrochemical methods. CHAp coating has been found to increase the corrosion resistance of titanium. The best parameters of the coating were achieved after 28 days immersion in Na2HPO4 solution. This analysis of the corrosive behavior shows that the protective capacity of the CHAp coatings is not high and can only be increased after the successful formation of a uniformly thick calcium hydroxyapatite coatings. |
