Nosenko A. Glass-ceramic materials with reactionary forming structure

The thesis is devoted to the development of the scientific foundations for the creation of base glasses and glass-ceramic materials with reactionary forming structure (RFS) on their basis having better operational characteristics for application in different areas of science and engineering. Scientific foundations of porous and dense heat-resistant glass-ceramic materials reception with RFS in the system Lі2O–Al2O3–SiO2 (mix composite, glass composition, temperature and time of sintering, dispersity of components) have been developed. The interrelation between the properties of materials and their crystal phase composition has been established. Experimental, thermodynamic and XRD methods showed principle possibility to obtain celsian glass-ceramic materials with RFS on the basis of glasses in oxide systems BaO–B2O3–SiO2, BaО–B2O3, BaО–ZnО–SіО2, BaО–MgО–SіО2 and crystal fillers containing alumina. The basic technological parameters of alkali free glass-ceramic materials production with low thermal expansion and very high dielectric parameters (chemical composition of base glasses and mix composites, method of blend preparation and products formations, temperature-time mode of sintering, dispersity of initial components, etc.) have been established. Conditions of glass-formation and regularities in properties of multilithium glasses (content of Lі2O up to 66,7%) in little-investigated oxide-salt systems Lі2O–Lі2WO4–B2O3, Lі2O–Lі2SO4–B2O3, Lі2O–(LіBO2)2–P2O5, Lі2O–Lі2SO4–P2O5 and Lі2O–LіF–P2O5 have been established. For the first time the conditions of dense glass-ceramic materials reception with high conductivity on lithium ions for thin films manufacturing of solid electrolytes of lithium chemical current source have been determined. On the basis of multilithium glasses of system Lі2O–Lі2SO4–B2O3, Lі2O–Lі2WO4–B2O3 and Lі2O–LіF–P2O5 the dense glass-ceramic materials have been obtained, their crystal-phase composition presented mainly by lithium pentaaluminate. These materials with conductivity on lithium ions up to X25оС = 7,6•10-5 Sm/cm are suitable for use as solid electrolytes for lithium chemical current source.