nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2024-4-153-163nuc-768Research ArticleСтатьиИЗУЧЕНИЕ МЕХАНИЗМОВ СТРУКТУРНЫХ ПОВРЕЖДЕНИЙ СТАБИЛИЗИРОВАННЫХ КЕРАМИК НА ОСНОВЕ ЦИРКОНАТОВ ПРИ ВЫСОКОТЕМПЕРАТУРНОМ ОБЛУЧЕНИИSTUDY OF STRUCTURAL DAMAGE MECHANISMS IN STABILIZED CERAMICS BASED ON ZIRCONATES UNDER HIGH-TEMPERATURE IRRADIATION WITH HEAVY IONSКозловскийА. Л.KozlovskiyA. L.

Астана; Алматы

Astana; Almaty

kozlovskiy.a@inp.kzКабиевМ. Б.KabiyevM. B.

Астана

Astana

КенжинаИ. Е.KenzhinaI. E.

Алматы

Almaty

ТоленоваА. У.TolenovaA. U.

Алматы

Almaty

Евразийский национальный университет им. Л.Н. Гумилева; РГП «Институт ядерной физики» МЭ РК; Satbayev UniversityКазахстанL.N. Gumilyov Eurasian National University; RSE “Institute of Nuclear Physics” ME RK; Satbayev UniversityKazakhstanЕвразийский национальный университет им. Л.Н. ГумилеваКазахстанL.N. Gumilyov Eurasian National UniversityKazakhstanРГП «Институт ядерной физики» МЭ РК; Satbayev UniversityКазахстанRSE “Institute of Nuclear Physics” ME RK; Satbayev UniversityKazakhstanSatbayev UniversityКазахстанSatbayev UniversityKazakhstan20243012202404153163Copyright © Козловский А.Л., Кабиев М.Б., Кенжина И.Е., Толенова А.У., 20252025Козловский А.Л., Кабиев М.Б., Кенжина И.Е., Толенова А.У.Kozlovskiy A.L., Kabiyev M.B., Kenzhina I.E., Tolenova A.U.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/768

В работе приведено всестороннее описание результатов экспериментальных работ, связанных с изучением механизмов накопления радиационных повреждений при облучении тяжелыми ионами Xe+ исследуемых образцов Nd2Zr2O7 керамик в нестабилизированном состоянии, и стабилизированных 0,15 М MgO и Y2O3, добавление которых согласно данным рентгенофазового анализа приводит к формированию в структуре примесных включений в виде MgO и Y2Zr2O7 зерен, которые создают буферный защитный слой в межзеренном пространстве, наличие которого приводит к увеличению сопротивляемости к радиационно-индуцированным процессам разупрочнения и снижения теплофизических параметров. В ходе определения зависимостей изменения деформационных искажений, возникающих в результате накопления структурных напряжений в кристаллической структуре и аморфизации, определение которой проводилось на основе изменений интенсивности дифракционных максимумов было определено равновероятное влияние обоих процессов при высокодозном облучении на деградацию приповерхностного поврежденного слоя, а также положительное влияние стабилизирующих компонент на сдерживание аморфизации и деформационного искажения при высокодозном облучении. Анализ изменения прочностных и теплофизических параметров Nd2Zr2O7 керамик, подверженных облучению тяжелыми ионами показал, что добавление в состав керамик стабилизирующих добавок в виде MgO и Y2O3 приводит к повышению устойчивости к радиационно-индуцированным процессам разупрочнения и деградации теплопроводности, обусловленных накоплением структурных деформационных искажений и метастабильных включений в поврежденном слое.

The paper presents a comprehensive description of the results of experimental work related to the study of the mechanisms of radiation damage accumulation during the irradiation with heavy Xe+ ions of the studied samples of Nd2Zr2O7 ceramics in the unstabilized state, and stabilized with 0.15 M MgO and Y2O3, the adding of which according to the data of X-ray phase analysis leads to the formation of impurity inclusions in the structure in the form of MgO and Y2Zr2O7 grains, which create a buffer protective layer in the intergranular space, the presence of which leads to an increase in resistance to radiation-induced processes of unstrengthening and reduction of thermophysical parameters. In the course of determining the dependences of changes in strain distortion resulting from the accumulation of structural stresses in the crystal structure and amorphization, which was determined on the basis of changes in the intensity of diffraction maxima, the equally probable influence of both processes at high-dose irradiation on the degradation of the near-surface damaged layer was determined, as well as the positive influence of stabilizing components on the inhibition of amorphization and strain distortion at high-dose irradiation. The analysis of changes in strength and thermophysical parameters of Nd2Zr2O7 ceramics subjected to irradiation by heavy ions has shown that the addition of stabilizing additives in the form of MgO and Y2O3 to ceramics composition leads to increased resistance to radiation-induced processes of de-strengthening and thermal conductivity degradation caused by the accumulation of structural deformation distortions and metastable inclusions in the damaged layer.

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