ИСТИНА

This work aimed to obtain a biocompatible ceramic material based on synthetic calcium phosphates and the aqueous solution of sodium silicate with a given phase composition in the Na2O–CaO–SiO2–P2O5 system intended for use in medicine. Pre-ceramic semi-finished products in the form of blocks were obtained by moulding in silicone moulds, and simple 3-dimensional layered geometric shapes were obtained by extrusion moulding using a syringe. The samples hardening occurred spontaneously both due to polycondensation of an aqueous sodium silicate solution and because of air-drying. Ceramic materials after firing at 1000°С consisted of sodium-calcium silicate Na6Ca3Si6O18 and β-rhenanite β-NaCaPO4. The geometric density of materials for all samples after firing at 1000℃ was 0.76 – 0.78 g/cm3, and the compressive strength was 2.5 – 3.5 MPa. The highly concentrated suspensions based on synthetic calcium phosphates and the aqueous sodium silicate solution can be recommended for porous composite biomaterials preparation with both defined geometry and a porous architecture of implants using extrusion 3D printing. The approach proposed in the current work allows one to achieve a given phase composition of composite biocompatible ceramic materials in the Na2O–CaO–SiO2–P2O5 system. This work was supported by the Russian Foundation for Basic Research (project No 18-29-11079).