nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2025-4-29-40nuc-888Research ArticleСтатьиРОЛЬ РАЗМЕРНЫХ ЭФФЕКТОВ И ФАЗОВЫХ ПОЛИМОРФНЫХ ПРЕВРАЩЕНИЙ В КОМПОЗИТНЫХ КЕРАМИКАХ НА ТЕПЛОИЗОЛЯЦИОННЫЕ ХАРАКТЕРИСТИКИ И СОПРОТИВЛЯЕМОСТЬ К ВНЕШНИМ ВОЗДЕЙСТВИЯМTHE ROLE OF SIZE EFFECTS AND PHASE POLYMORPHOUS TRANSFORMATIONS IN COMPOSITE CERAMICS ON THERMAL INSULATION CHARACTERISTICS AND RESISTANCE TO EXTERNAL INFLUENCESКенжинаИ. Е.KenzhinaI. E.

Алматы

Almaty

КозловскийА. Л.KozlovskiyA. L.

Алматы

Almaty

artem88sddt@mail.ruХаметовШ.KhametovCh.

Астана

Astana

БлынскийП.BlynskiyP.

Алматы

Томск

Almaty

Satbayev University; РГП «Институт ядерной физики» Агентства РК по атомной энергииКазахстанSatbayev University; RSE “Institute of Nuclear Physics” of the Agency of the Republic of Kazakhstan for Atomic EnergyKazakhstanНАО «Евразийский национальный университет им. Л.Н. Гумилева»КазахстанNJSC L.N. Gumilyov Eurasian National UniversityKazakhstanSatbayev University; Национальный исследовательский Томский политехнический университетКазахстанSatbayev University; National Research Tomsk Polytechnic UniversityKazakhstan202508122025042940Copyright © Кенжина И.Е., Козловский А.Л., Хаметов Ш., Блынский П., 20252025Кенжина И.Е., Козловский А.Л., Хаметов Ш., Блынский П.Kenzhina I.E., Kozlovskiy A.L., Khametov C., Blynskiy P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://journals.nnc.kz/jour/article/view/888

В работе рассмотрена роль изменений морфологии зерен, связанных с процессами фазовых полиморфных превращений в ZrO2 при варьировании концентрации стабилизирующего допанта Y2O3 на изменение теплофизических параметров, а также устойчивости к внешним воздействиям, вызванным резкими изменениями температур, механических нагрузок, длительным термическим нагревом. Оценка фазовых трансформаций, вызванных изменением концентрации стабилизирующего допанта Y2O3 показала, что при малых концентрациях доминирующую роль в фазовых изменениях играют процессы превращений типа m – ZrO2 → t – Zr(Y)O2, в то время как при концентрациях допанта выше 0,10 М доминируют процессы с образованием фазы пирохлора Y2Zr2O7, процессы фазообразования которой приводят к укрупнению зерен при спекании. Согласно оценке теплоизоляционных характеристик установлено, что доминирование в составе композитных керамик фазы пирохлора Y2Zr2O7 приводит к снижению теплопроводности керамик, а также увеличению эффективности теплоизоляции, как в случае низких температур, так и при длительном воздействии высокотемпературного нагрева. Оценка устойчивости керамик к процессам термошоковых воздействий, связанных с резким изменением температуры нагрева – охлаждения, показала, что композитные керамики с доминирующей в составе фазой пирохлора обладают большей устойчивостью к температурным перепадам, за счет сохранения стабильности к внешним воздействиям и низкой теплопроводности.  

The paper examines the role of changes in grain morphology associated with the processes of phase polymorphic transformations in ZrO2 with varying concentrations of the stabilizing dopant Y2O3 on changes in thermophysical parameters, as well as resistance to external influences caused by sudden changes in temperature, mechanical loads, and prolonged thermal heating. An assessment of phase transformations caused by a change in the concentration of the stabilizing dopant Y2O3 showed that at low concentrations, the dominant role in phase changes is caused by processes of the m – ZrO2 → t – Zr(Y)O2 type, while at dopant concentrations above 0.10 M, processes with the formation of the pyrochlore phase Y2Zr2O7 dominate, the phase formation processes of which led to grain coarsening during sintering. According to the assessment of thermal insulation characteristics, it was established that the dominance of the pyrochlore Y2Zr2O7 phase in the composition of composite ceramics leads to a decrease in the thermal conductivity of ceramics, as well as an increase in the efficiency of thermal insulation, both in the case of low temperatures and under prolonged exposure to high-temperature heating. An assessment of the resistance of ceramics to thermal shock processes associated with a sharp change in heating-cooling temperature showed that composite ceramics with a dominant pyrochlore phase in the composition have greater resistance to temperature changes due to maintaining stability to external influences and low thermal conductivity.

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The authors declare that there are no conflicts of interest present.