Tsapko N. Cement for multifunctional destinations based on the compositions of highly barium BaO-Al2O3-SiO2 system

The object of study: the processes of phase formation of multifunctional barium containing cements cements in the BaO-Al2O3-SiO2 system. Purpose of the study: to research the structure of the BaO-Al2O3-SiO2 system and to development special cements based on the compositions of highly barium area of this system, including the hydraulically active phases with high strength, electrical characteristics, with radio-opacity and increased resistance to gamma radiation. Research Methods and Equipment: thermodynamic, X-ray (DRON-3M), differential-thermal (derivatograph Q-1500D system F.Paulik-J.Paulik-L.Erdey and derivatograph STA 409 PC), petrographic (polarizing microscope MIN-8, electronic microscopes Axiovert 40 MAT and Axioobserver D 1m, as well as scanning electron microscope Remmy-102), chemical analysis of materials and complex physical and mechanical methods. Theoretical and practical results: on the base of the developed scientific terms and experimental data effective cements for multifunctional purposes with complex specified performance properties based on the compositions of highly barium BaO-Al2O3-SiO2 system were developed; technological instruction for a typical manufacturing process of barium containing radio-opacity cement for the needs of stomatology was developed. Novelty: on the base of the results of thermodynamic predictions physical-chemical and kinetic regularities for phase compositions forming during clinker synthesis in the highly barium field of the BaO-Al2O3-SiO2 system were set, and these regularities causing the formation of the necessary micro crystalline hydrate splice in cement stone and properties that satisfy the conditions of the selected operation areas. Degree of introduction: The results have been introduced in the educational process of the NTU "KhPI". Industry of use: the results of this work can be used at the enterprises of the electrical industry as a binder for bonding of dielectric structures; in non-ferrous metallurgy for printed and torkretmass of concrete; in the energy industry as a radiation-resistant materials in a variety of nuclear power facilities; dental cements recommended for use as a radio-opacity filling materials for the needs of clinical dentistry; research results should be used in higher educational institutions during specialist training on the technology of refractory nonmetallic and silicate materials.