NEW METHODS FOR MEASURING THE PROPERTIES OF ANTIBIOGENIC COATINGS OF MEDICAL TITANIUM IMPLANTS FOR TRAUMATOLOGY AND ORTHOPEDICS
The work is a part of researches of the technical characteristics of 20 types of medical titanium implants for traumatology and orthopedics with antibiogenic coating of titanium and hafnium nitrides in accordance with technical conditions of the manufacturer of the implants – JSC “Medmash”, Russia. Based on a titanium alloy the implant with antibiogenic coating is a product coated with titanium and hafnium nitride by high-frequency magnetron sputtering.
In the present article, the structure, phase composition, distribution of elements on the surface and thickness (Ti-Hf)N-coatings with different hafnium content (Ti:Hf ratio) were investigated. The studies were carried out on model samples in the form of plates of titanium alloy VT6, which were coated with titanium and hafnium nitride by magnetron sputtering. Also, changes in the thickness of the hardness and modulus of elasticity of the coatings were measured by the method of instrumental indentation. The maximum values of hardness (~35 GPa) and modulus of elasticity (~500 GPa) were obtained from coatings of composition (Ti0.85Hf0.15)N and (Ti0.8Hf0.2)N. The coatings with these compositions have the most uniform Hf thickness distribution.