Effect of the addition of titanium oxide on the technology of obtaining and the properties of thin-film calcium-phosphate materials

Abstract

The sol-gel method produced composite calcium-phosphate coatings on a silicon substrate (model) and on the oxidized surface of titanium. The films were prepared using sol-gel technology, which includes the following processing steps: preparation of the film-forming solution (including the solvent preparation step: purification, drying); aging of the film-forming solution for its maturation (formation in sol solution); application of the film-forming solution to the substrate (the article to be coated), including the surface preparation of the product (cleaning, degreasing); reception of dispersed materials. The films were obtained by stretching and centrifugation; heat treatment of the coated product (at the same time, the product can be annealed to relieve internal stresses).In the production of films by various methods, the character of the distribution of drift-like protrusions along the surface of the sample changes. The most regular character of roughness (relief) is the samples obtained by drawing, which is important for the practical application of coatings. The relief of the surface is lower and most developed with sufficiently uniformly arranged crystalline formations for samples obtained by drawing. For the oxidized surface of titanium, the protrusions of more than 2 μm and the maximum height of 6 μm occupy the most part, when the film is applied to the oxidized surface of titanium, the proportion of protrusions more than 2 μm decreases by half. The sol-gel coating alters the morphology of the oxidized surface of titanium. The oxidized surface of titanium has a pronounced array of protrusions, when the sol-gel coating is applied, the relief is supplemented with a structured sol-gel film. When titanium oxide is introduced into the calcium phosphate system, the relief is improved and complemented, and the adhesive properties of the oxidized titanium surface are enhanced.