Formation features, structure and properties of bioactive coatings based on phosphate-calcium layers, deposited by a low energy electron beam

摘要

The work aimed at examining the structure of a new bioactive phosphate-calcium coating, its transformation while annealing and interaction with a biologically active medium that simulates blood chemistry, the effect of coating on the corrosion properties of Ti6Al4V alloy. Bioactive phosphate-calcium layer, initiating the growth of hydroxyapatite in a biological environment, was formed in the process of electron-beam deposition of layers based on magnesium, calcium, phosphorus oxide and silicone resin without depressurization of the vacuum chamber. Calcium layer is suggested to be formed by means of exposure of low-energy electron beam to calcium hydride. Heat treatment (500 degrees C) leads to the formation of crystalline regions in the coating volume and cross linked organosilicon particles, which act as nucleation centers of hydroxyapatite (HA). It is noted that the presence of the organosilicon component and the conduct of heat treatment are not a prerequisite for the HA occurrence on the surface and in the volume of the deposited layer. It has been established that the application of the annealed four-layer system to the surface of the Ti6Al4V alloy improves its corrosion properties.