nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2025-2-37-50nuc-804Research ArticleСтатьиОПРЕДЕЛЕНИЕ ВЛИЯНИЯ РАЗМЕРНОГО ФАКТОРА И ФАЗОВОГО СОСТАВА В ЛИТИЙСОДЕРЖАЩИХ КЕРАМИКАХ НА УСТОЙЧИВОСТЬ К ВНЕШНИМ МЕХАНИЧЕСКИМ И ТЕРМИЧЕСКИМ ВОЗДЕЙСТВИЯМDETERMINATION OF THE EFFECT OF SIZE FACTOR AND PHASE COMPOSITION IN LITHIUM-CONTAINING CERAMICS ON RESISTANCE TO EXTERNAL MECHANICAL AND THERMAL INFLUENCESКенжинаИ. Е.KenzhinaI. E.

Алматы

Almaty

ТоленоваА. У.TolenovaA. U.

Алматы 

Almaty

КозловскийА. Л.KozlovskiyA. L.

Almaty

artem88sddt@mail.ruКазНИТУ им. К.И. Сатпаева; РГП «Институт ядерной физики» МЭ РККазахстанSatbayev University; RSE “Institute of Nuclear Physics” ME RKKazakhstanКазНИТУ им. К.И. СатпаеваКазахстанSatbayev UniversityKazakhstan202514072025023750Copyright © Кенжина И.Е., Толенова А.У., Козловский А.Л., 20252025Кенжина И.Е., Толенова А.У., Козловский А.Л.Kenzhina I.E., Tolenova A.U., 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/804

В работе представлены данные исследования влияния размерных факторов, обуславливающих изменение дислокационной плотности, а также фазового состава двухфазных литийсодержащих керамик на основе метацирконата лития на прочностные характеристики керамик, а также устойчивость к высокотемпературным испытаниям. В качестве факторов упрочнения при оценке прочностных свойств, а также устойчивости к температурным воздействиям рассматривались размерный эффект, дислокационная плотность и наличие межфазных границ, изменение которых обусловлено эффектом вариации фазового состава керамик. В ходе проведенных исследований было установлено, что изменение скорости перемалывания выше 400 оборот/мин приводит к более чем двукратному уменьшению размеров зерен, что в свою очередь увеличивает дислокационную плотность, изменение которой является упрочняющим фактором для повышения твердости и трещиностойкости. При определении прочностных характеристик было установлено, что изменение фазового состава за счет доминирования фазы Li6Zr2O7 в составе керамик приводит к увеличению значений твердости и устойчивости к растрескиванию за счет увеличения межфазных границ, которые служат дополнительными барьерами для распространения микротрещин при внешних воздействиях. В ходе проведенных экспериментов по определению устойчивости к длительному термическому отжигу и тестов на термостойкость было установлено, что уменьшение размеров зерен менее 250 нм для всех трех типов исследуемых керамик приводит к увеличению устойчивости к деградации прочностных свойств за счет дислокационного упрочнения, а также наличия межфазных границ, которое наиболее проявлено для образцов с доминированием фазы Li6Zr2O7 в составе керамик.

The paper presents data on the effect of size factors that cause a change in dislocation density, as well as the phase composition of two-phase lithium-containing ceramics based on lithium metacirconate on the strength characteristics of ceramics, as well as resistance to high-temperature tests. The size effect, dislocation density and the presence of interphase boundaries, the change of which is due to the effect of variation in the phase composition of ceramics, were considered as hardening factors during assessment of the strength properties, alongside resistance to temperature influences. During the studies, it was found that alteration of the grinding speed above 400 rpm results in more than twofold decrease in grain size, which in turn elevates the dislocation density, the change in which is a hardening factor for growth of hardness and crack resistance. During determination of the strength characteristics, it was found that a change in the phase composition due to the dominance of the Li6Zr2O7 phase in the composition of ceramics leads to an elevation in hardness and resistance to cracking due to an increase in interphase boundaries, which serve as additional barriers to the propagation of microcracks under external influences. During experiments conducted to determine resistance to long-term thermal annealing and heat resistance tests, it was found that grain size reduction to less than 250 nm for all three types of ceramics under study leads to a rise in degradation resistance of strength properties due to dislocation hardening, and the presence of interphase boundaries, which is most pronounced for samples with a predominance of the Li6Zr2O7 phase in the ceramic composition.

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