nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2023-1-69-76nuc-476Research ArticleСтатьиИССЛЕДОВАНИЕ ПРОЦЕССОВ ФАЗООБРАЗОВАНИЯ В КОМПОЗИТНЫХ Al2O3-Si3N4 КЕРАМИКАХ ПРИ ВАРИАЦИИ ТЕМПЕРАТУРЫ СПЕКАНИЯINVESTIGATION OF PHASE FORMATION PROCESSES IN COMPOSITE Al2O3-Si3N4 CERAMICS WITH VARIATIONS OF SINTERING TEMPERATUREБоргековД. Б.BorgekovD. B.

Астана; Алматы

Astana; Almaty

kozlovskiy.a@inp.kzКозловскийА. Л.KozlovskiyA. L.

Козловский Артем Леонидович.

Астана; Алматы

Artem L. Kozlovskiy

Astana; Almaty

kozlovskiy.a@inp.kzНАО Евразийский национальный университет им. Л.Н. Гумилева; Институт ядерной физики МЭ РККазахстанL.N. Gumilyov Eurasian National University; Institute of Nuclear Physics ME RKKazakhstan202330032023016976Copyright © Боргеков Д.Б., Козловский А.Л., 20232023Боргеков Д.Б., Козловский А.Л.Borgekov D.B., 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/476

Целью данной работы является установление закономерностей процессов фазообразования в Al2O3-Si3N4 керамиках в диапазоне температур отжига от 800 до 1500 °С, а также определение влияния фазового состава керамик на прочностные свойства. Интерес к данному классу композитных керамик обусловлен возможностями применения их в качестве материалов для инертных матриц дисперсного ядерного топлива. Оценка фазового состава в результате термического отжига образцов была проведена с применением метода рентгенофазового анализа. В ходе проведенного анализа установлены следующие фазовые превращения: Si3N4/Al2O3 → Si3N4/Al2O3-M/Al2O3-R → Si3N4/Al2O3-R/Al2SiO5 → Al2SiO5/SiO2, согласно которым изменение температуры отжига приводит к полиморфным превращениям оксида алюминия при увеличении температуры отжига, а также формированию фазы сложного оксида типа Al2SiO5. При этом при температуре отжига выше 1400 °С наблюдается превращение типа Si3N4 → SiO2, связанное с процессами разложения нитрида кремния и его трансформации в оксид кремния при взаимодействии с воздушной средой при отжиге. Было установлено, что первичными процессами при отжиге керамик являются процессы структурного упорядочения образцов, без значительного изменения соотношения фаз.

The purpose of this work is to establish regularities in the processes of phase formation in Al2O3-Si3N4 ceramics in the annealing temperature range from 800 to 1500 °C, as well as to determine the effect of the phase composition of ceramics on strength properties. Interest in this class of composite ceramics is due to the possibility of using them as materials for inert matrices of dispersed nuclear fuel. The evaluation of the phase composition as a result of thermal annealing of the samples was carried out using the method of X-ray phase analysis. In the course of the analysis, the following phase transformations were established: Si3N4/Al2O3 → Si3N4/Al2O3-M/Al2O3-R → Si3N4/Al2O3-R/Al2SiO5 → Al2SiO5/SiO2, according to which a change in the annealing temperature leads to polymorphic transformations of aluminum oxide with an increase in the annealing temperature, as well as the formation of a complex oxide phase of the Al2SiO5 type. At the same time, at an annealing temperature above 1400 °C, a transformation of the Si3N4 → SiO2 type is observed, associated with the processes of decomposition of silicon nitride and its transformation into silicon oxide upon interaction with air during annealing. It was found that the primary processes during annealing of ceramics are the processes of structural ordering of samples, without a significant change in the phase ratio.

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