Optimization of the Component Composition of the Ceramic Coating of Titanium Alloys for Biocompatibility of Domestic Endoprostheses

The study is aimed at developing and determining parameters of the preparation under laboratory conditions of an optimum composition of a biocompatible powder material of a CaO–MgO–SiO2 system that stimulates and activates cell recovery, growth, and differentiation of bone tissue. The patterns of the transformations and formation of akermanite Ca2Mg(SiO7), merwinite Ca3Mg(SiO4)4, larnite Ca2(SiO4), bredigite Ca7Mg(SiO4), and olivine (Mg,Fe)2SiO4 in this system are presented. The molecules are identified by vibrational (IR) spectroscopy and Raman spectroscopy. The quantitative ratio of the indicated chemical compounds in the powders is found by phase X-ray diffraction (XRD) analysis. The transformation patterns of these compounds during annealing in a temperature range of 1000–1500°C for holding times of 1–10 h are experimentally determined. Since the akermanite concentrations higher than 55 wt % are achieved in the CaO–MgO–SiO2 system in the experimentally obtained one-stage mode or theoretically calculated sequential annealing mode, a powdered conglomerate with a high content of the biocompatible component in the calcium–magnesium–silicate mixture can be prepared. The calcium–magnesium–silicate mixture is designed for studying biocompatible properties of coatings of titanium endoprostheses under artificial conditions (in vitro).