STUDY OF THERMAL COEFFICIENT OF LINEAR EXPANSION OF BIOCOMPATIBLE GLASS CRYSTALLINE MATERIALS BASED ON THE SYSTEM Li2O–СaO–ZrO2–TiO2–MgO–ZnO–Al2O3–B2O3–P2O5–SiO2

Abstract

The prospect of using biocompatible scaffolds with bone tissue architecture to replace large areas of bone tissue has been established. The necessity of creating reinforced porous bioactive glass-crystalline materials, which are operated under conditions of variable loads and characterized by high osteoconductive and osteoinductive properties, has been established. The main criteria for the formation of a reinforced hierarchical porous structure of bioactive glass-crystalline materials under the conditions of heat treatment have been determined. The choice of the system is justified Li2O–СaO–ZrO2–TiO2–MgO–ZnO–Al2O3–B2O3–P2O5–SiO2, within which the compositions of the OS series glasses with the content of the main components and modifying additives are selected, wt. %. %: CaF2 0,5–2,5; CeO2 0,01–0,05; SrO 0,01–0,05; Nb2O3 0,01–0,1; SrO 0,01–0,1 and with the ratio Са:P = 1,67 and SiO2:Li2O = 4,0 and glass-crystalline materials were developed, which are characterized by the content of crystalline phases of hydroxyapatite and lithium disilicate for the formation of a bioactive reinforced structure. The influence of the chemical and phase composition of model glasses on the crystallization ability and thermal properties of glass-crystalline materials based on them was analyzed. It was determined that the indicator TСLЕ indicator for experimental glass materials in the temperature range of 25–600 °С is 78–130,2·10-7°С-1 and is recognized by the type and content of crystalline phases and the composition of the glass phase. It was established that the formation of a sytalized interconnected structure with the presence of 50 vol. % hydroxyapatite and 10 об. % lithium with TСLЕ about 100·10-7°С-1, determines the possibility of obtaining high-quality durable and defect-free porous biocompatible materials and coatings on titanium alloys based on calcium-silicophosphate glass-crystalline materials for creating a single endoprosthesis design. The creation of reinforced nanostructured glass-crystalline materials with a hierarchical porous structure, the ability to withstand thermal loads and the formation of a strong connection with titanium alloys will allow solving the urgent problems of replacing significant areas of bone tissue.