nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2022-3-82-87nuc-445Research ArticleСтатьиИЗУЧЕНИЕ ПРОЦЕССОВ ФАЗООБРАЗОВАНИЯ В ИНЕРТНЫХ МАТРИЦАХ ПО ТИПУ CER-CER НА ОСНОВЕ ОКСИДНЫХ СОЕДИНЕНИЙSTUDY OF PHASE FORMATION PROCESSES IN CER-CER TYPE INERT MATRICES BASED ON OXIDE COMPOUNDShttps://orcid.org/0000-0002-9397-5848КенжинаИ. Е.KenzhinaI. E.

Алматы

Almaty

kenzhina@physics.kzШаймерденовА. А.ShaimerdenovA. A.

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Almaty

aashaimerdenov@gmail.comТоленоваА. У.TolenovaA. U.

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Almaty

kenzhina@physics.kzАскербековС. К.AskerbekovS. K.

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Almaty

askerbekov@physics.kzКозловскийА. Л.KozlovskiyA. L.

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Almaty

artem88sddt@mail.ruSatbayev University; Казахстанско-Британский технический университетКазахстанSatbayev University; Kazakh-British Technical UniversityKazakhstanSatbayev University; Институт ядерной физики МЭ РККазахстанSatbayev University; Institute of Nuclear Physics of ME RKKazakhstanSatbayev UniversityКазахстанSatbayev UniversityKazakhstan202228092022038287Copyright © Кенжина И.Е., Шаймерденов А.А., Толенова А.У., Аскербеков С.К., Козловский А.Л., 20222022Кенжина И.Е., Шаймерденов А.А., Толенова А.У., Аскербеков С.К., Козловский А.Л.Kenzhina I.E., Shaimerdenov A.A., Tolenova A.U., Askerbekov S.K., Kozlovskiy A.L.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/445

Целью данной работы является изучение процессов фазообразования в образцах (1-x)ZrO2 – xAl2O3 керамик в зависимости от вариации компонент оксидов, а также установлению изменения структурных параметров и степени кристалличности. Выбор в качестве основы для инертных матриц ядерного топлива по типу cer-cer оксидов циркония и алюминия обусловлен их физико-химическими, структурными и механическими свойствами, совокупность которых позволит получить новый тип керамик, обладающий большим потенциалом в области ядерного топлива. Данные оксидные соединения обладают высокой термической стабильностью и устойчивостью к воздействию высоких температур, что также позволяет использовать их в качестве основы для дисперсного ядерного топлива для высокотемпературных ядерных реакторов нового поколения. Для получения керамик на основе оксидных соединений был выбран метод механохимического перемалывания с последующим термическим отжигом. Выбор условий перемалывания, а также последующего термического отжига был выбран для инициализации процессов фазовых превращений и структурных изменений в результате термического воздействия и частичной релаксации инициированных при перемалывании деформационных искажений и метастабильных формирований. В качестве основного метода изучения процессов фазообразования и структурных изменений был выбран метод рентгеновской дифракции. В ходе проведенных исследований было установлено, что добавление оксида алюминия приводит к структурному упорядочению основной моноклинной фазы ZrO2, а также формированию твердых растворов замещения и внедрения. При равной концентрации компонент оксидов с помощью метода рентгенофазового анализа было установлено полиморфное фазовое превращение в диоксиде циркония, наличие которого свидетельствует о процессах фазовых трансформаций, возникающих при добавлении оксида циркония и изменения процессов фазообразования.

The purpose of this work is to study the processes of phase formation in the samples (1-x)ZrO2 – xAl2O3 ceramics depending on the variation of the oxide components, as well as to establish changes in the structural parameters and degree of crystallinity. The choice of zirconium and aluminum oxides as the basis for cer-cer inert matrices for nuclear fuel is due to their physical, chemical, structural and mechanical properties, the combination of which will produce a new type of ceramics with great potential in the field of nuclear fuel. These oxide compounds have high thermal stability and resistance to high temperatures, which also allows their use as a basis for disperse nuclear fuel for new-generation hightemperature nuclear reactors. The method of mechanochemical milling followed by thermal annealing was chosen to obtain ceramics based on oxide compounds. The choice of grinding conditions, as well as the subsequent thermal annealing was chosen to initiate the processes of phase transformations and structural changes as a result of thermal influence and partial relaxation of the deformation distortions and metastable formations initiated during grinding. The X-ray diffraction method was chosen as the main method to study the processes of phase transformation and structural changes. During the studies it was found that the addition of aluminum oxide leads to the structural ordering of the main monocline phase ZrO2, as well as the formation of solid solutions of substitution and introduction. At equal concentrations of the oxide components using the method of X-ray phase analysis was established polymorphic phase transformation in zirconium dioxide, the presence of which indicates the processes of phase transformation arising from the addition of zirconium oxide and changes in the phase formation processes.

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