Search academic texts

Information × Registration Number 0218U002210, 0114U002427 , R & D reports Title Development of scientific foundations of high-temperature capillarity with a possible use of the ab initio calculations of adhesion and wetting degree, experimental studies of adhesion interaction of metal oxides of a IVа groupe of a periodic system (SiO2, GeO2, SnO2) at the metal interface and contact electrophysical properties popup.stage_title Head Naidich Yury Vladimirovich, Registration Date 02-02-2018 Organization Frantzevich Insitute for Materials Science Problems of the Ukranian National Academy of Sciences popup.description2 Objects of investigations - ceramic materials based on metal oxides of a IVа groupe of a periodic system and some their solid solutions (SnO2, SnO2-1Fe2O3, SnO2-0,5CuO, and also SiO2 for a comparison). The aim of the work - subsequent development of physicochemical bases of a high-temperature capillarity of metal melts contacting with new groupes of oxide materials and elaboration of methods of adhesion processes control. Comprehensive studies of interphase interaction, adhesion and wetting of tin dioxide by metal melts were performed. Peculiarities of wetting of SnO2 supports by metal melts in various atmospheres: vacuum (pure metals and some alloys), air and pure oxygen (Ag-Cu-O et al.) have been ascertained. Concentration, time and temperature dependencies of wetting angles of some metal melts on SnO2 were obtained. For wetting improvement compounds having high electron affinity (e.g. oxygen) were used as an alternative method of metal melts alloying. Oxygen partial pressure effect on SnO2-ceramics wetting was studied. Electrical current influence on wetting in the air atmosphere of SnO2-ceramics by Ag, Ag-Cu melts and ZrO2-ceramics by Cu, Ni melts in a vacuum was also investigated. The dependencies of adhesion processes on current strength and time exposure were analyzed. Some experiments concerning wetting of steel, nickel and SnO2 supports by Ag, Cu and PSR-72 solder in the CO2 atmosphere have been carried out. Using density functional theory (DFT) the calculations of a SnO2 crystal lattice and volume electronic structure of the crystal were performed. Power levels of a ground state of single-electron orbitals (Kon-Schem), atomic forces, stresses and structural optimization, band structure and density of electronic states (DOS) were also calculated. Product Description popup.authors Григоренко Микола Федорович Дуров Олексій Вікторович Курочкин Володимир Данилович Полуянська Валентина Володимирівна Сидоренко Тетяна Валентинівна Черніговцев Євгеній Петрович popup.nrat_date 2020-04-02 Close