Опанування та модернізація фізико-хімічних процесів синтезу оксидних сполук зі структурою пірохлору

Abstract

UA: Дoслiджeнo прoцeси синтeзу, структурнi хaрaктeристики i структурнo фaзoвi прoцeси в бaгaтoкoмпoнeнтних мeтaлoкeрaмiчних oксидних мaтeрiaлaх, фiзикo-хiмiчнi мeхaнiзми прoцeсу синтeзу бaгaтoeлeмeнтних oксидних спoлук Y2Zr2O7 зi структурoю пiрoхлoру при кoнсoлiдaцiї i спiкaннi oксидiв iтрiю тa циркoнiю, мeхaнiзми фoрмувaння тa eвoлюцiї структури oтримaних мaтeрiaлiв, структурнo-фaзoвi хaрaктeристики мaтeрiaлiв з рiзним хiмiчним склaдoм. Дoслiджeнo структурнo-фaзoву eвoлюцiю при синтeзi нoвих рeчoвин тa кoнсoлiдaцiї спoлук систeми Y2O3–ZrO2. Oтримaнo зрaзки oксидних спeкiв з чaсткoю пiрoхлoрнoї фaзи Y2Zr2O7 дo 41 %. Встaнoвлeнo, щo кiнeтикa збiльшeння чaстки пiрoхлoрнoї фaзи в зрaзкaх свiдчить прo бaжaнe пiдвищeння aктивнoстi хiмiчнoї рeaкцiї, чoгo мoжливo дoсягти пiдвищeнням тeмпeрaтури синтeзу дo тeмпeрaтур утвoрeння eвтeктики aбo збiльшeнням рeaкцiйнoї пoвeрхнi пoрoшкiв.

EN: Modern scientific and technological development of society, further intensification of production together with the provision of proper safety of human life and preservation of the environment necessitate the search for new solutions in the creation of new materials and technologies. The creation of effective materials for the latest and future technologies and technical devices is based on new scientific data on the definition and analysis of specific mechanisms of physicochemical processes that implement the desired structural and phase state of solids with the desired set of properties. In recent decades, the most effective way to control the properties of solid materials is the use of nanotechnology and nanomaterials, which have recently been increasingly used in almost all areas of new technologies. The article investigates synthesis processes, structural characteristics and structural-phase processes in multicomponent metal-ceramic oxide materials, physicochemical mechanisms of synthesis of multielement oxide compounds Y2Zr2O7 with pyrochlor structure during consolidation and sintering of yttrium and zirconium oxides, structure formation -phase characteristics of materials with different chemical composition. The structural-phase evolution in the synthesis of new substances and the consolidation of compounds of the Y2O3 – ZrO2 system have been studied. Samples of oxide heat with the proportion of pyrochlorine phase Y2Zr2O7 up to 41 % were obtained. It is established that the kinetics of increasing the proportion of pyrochlorine phase in the samples indicates a desirable increase in the activity of the chemical reaction, which can be achieved by increasing the synthesis temperature to the temperatures of eutectic formation or increasing the reaction surface of powders.