Ceramics in the CaO–SiO2 and Na2O–CaO–SiO2 systems were obtained from powders synthesized from aqueous solutions of silicic acid and calcium nitrate at a molar ratio of Ca/Si = 0.5 by direct precipitation with the addition of an aqueous solution of ammonia. Solutions of silicic acid prepared via the dynamic ion exchange method passing an aqueous solution of sodium silicate Na2SiO3 through a column with KU-2x8 sulfopolysterol cationite from top to bottom or from bottom to top were used for the synthesis of the starting powders. High-purity silicic acid, which does not contain sodium ions, was obtained by feeding an aqueous solution of sodium silicate Na2SiO3 from the bottom to top. The powders after synthesis contained hydrated calcium silicates and hydrated silicon dioxide. The powder synthesized from acid containing sodium ions included a reaction by-product - sodium nitrate NaNO3. Ceramics with a phase composition including cristobalite SiO2, tridymite SiO2, and sodium calcium silicate Na2Ca3Si6O16 were obtained after firing at 800…1000 °C from a synthesized powder containing sodium nitrate NaNO3. Ceramics with a phase composition including SiO2 (cristobalite, quartz) and CaSiO3 (wollastonite, pseudowollastonite) were obtained after firing at 1000...1200 °C from powder synthesized from high purity silicic acid. The obtained ceramic materials, whose phase composition contains biocompatible phases in CaO–SiO2 and Na2O–CaO–SiO2 oxide systems, can be used to create bone implants after the necessary in vitro and in vivo studies.
Junyan Ju – student, Materials Science Department, Lomonosov Moscow State University, Moscow, Russia
Tatiana V. Safronova – PhD (Engineering), senior researcher, Department of Chemistry, Materials Science Department, Lomonosov Moscow State University, Moscow, Russia
Olga T. Gavlina – PhD (Chemistry), researcher, Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Tatiana B. Shatalova – PhD (Chemistry), Associate Professor, Department of Chemistry, Materials Science Department, Lomonosov Moscow State University, Moscow, Russia
Tatiana V. Filippova – engineer, Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Nikolay V. Leontiev – postgraduate student, Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Dinara R. Khairutdinova – PhD (Engineering), senior researcher, A. A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia
Vadim B. Platonov – PhD (Chemistry), researcher, Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Alexander V. Knotko – Dr. Sci. (Chemistry), Professor, Materials Science Department, Lomonosov Moscow State University, Moscow, Russia
Ekaterina A. Karpyuk – PhD (Chemistry), Associate Professor, Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Vladimir A. Ivanov – Dr. Sci. (Chemistry), senior researcher, Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
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