Surface Topography of Composite Coatings Based on Ti-Al3

Abstract

currently, the development of biomaterials that have the required characteristics for various tissues is one of the main problems in medicine and engineering. Obtaining calciumphosphate coatings on metal surfaces is one of the urgent problems in materials science. Nevertheless, there is no unambiguous data on what physicochemical properties (phase and elemental composition, structure, crystallinity, roughness, solubility, etc.) should have an implant surface that ensures its osseointegration. In this work, to obtain calcium-phosphate coatings, we used the method of detonation-gas spraying of powder materials on a Grade2 titanium base. A TiAl₃ mixture with the addition of calcium hydroxyapatite was used as powder materials. The mass percentage of TiAl₃ in the mixture was 40%, 55%, 65%, 80%. The topography of the coating surface was determined by computer three-dimensional modeling based on data obtained using a Zygo New View 7300 interferometer-profilometer. It was found that with an increase in the intermetallic content in the TiAl3 mechanocomposite with hydroxyapatite ( Ca₁₀(PO₄ )₆(OH)₂), the layer roughness of the surfacing of composite materials increases from Ra = 2.628 µm to Ra = 3.490 µm . At the same time, the roughness of the layer has an important role in the growth of bone tissue. Comparative analysis of the dependence of bone tissue growth on the roughness of coatings showed that layers obtained by detonation-gas spraying based on hydroxyapatite have a higher efficiency of about 100%
of bone tissue growth at roughness values Ra = 2–4 µm .