nucВестник НЯЦ РКNNC RK Bulletin1729-75161729-7885Национальный ядерный центр Республики Казахстан10.52676/1729-7885-2025-1-113-120nuc-787Research ArticleСтатьиИССЛЕДОВАНИЕ УСТОЙЧИВОСТИ ФАЗОВОГО СОСТАВА И СТРУКТУРНЫХ ПАРАМЕТРОВ НИТРИДНЫХ КЕРАМИК К ТЕРМИЧЕСКИМ ВОЗДЕЙСТВИЯМSTUDY OF THE STABILITY OF PHASE COMPOSITION AND STRUCTURAL PARAMETERS OF NITRIDE CERAMICS TO THERMAL EFFECTSКозловскийА. Л.KozlovskiyA. L.

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artem88sddt@mail.ruНАО Евразийский национальный университет им. Л.Н. Гумилева; РГП «Институт ядерной физики» МЭ РККазахстанNAS L.N. Gumilyov Eurasian National University; RSE “Institute of Nuclear Physics” ME RKKazakhstan20250104202501113120Copyright © Козловский А.Л., 20252025Козловский А.Л.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/787

В работе с применением метода in-situ измерений рентгеновских дифрактограмм была изучена стабильность фазового состава, а также структурных параметров Si3N4 керамик в широком температурном диапазоне от 25 до 1400 ℃, охватывающем диапазон рабочих температур при эксплуатации керамик в экстремальных условиях. Основная цель данного исследования заключается в определении фазовых и структурных изменений в Si3N4 керамиках в результате термических воздействий, а также определению роли термического воздействия на структурные особенности керамик, связанные с термическим расширением. В ходе проведенных экспериментов было установлено, что термический нагрев образцов в вакууме не приводит к инициализации процессов окисления, характерных для термообработки Si3N4 керамик на воздухе, которые сопровождаются формированием оксидной фазы SiO2. При этом оценка весовых вкладов установленных фаз в составе керамик показала отсутствие какихлибо значимых изменений в соотношении фаз во всем измеряемом диапазоне температур отжига. На основе изменений объемов кристаллической решетки обеих фаз в составе Si3N4 керамик была определена величина коэффициента теплового объемного расширения в зависимости от температуры воздействия. Установлено, что средняя величина коэффициента βV(T) составляет порядка 8,5–10·10−6 K−1 для обеих установленных фаз в составе, при этом в случае α-Si3N4 фазы, изменение величины βV(T) имеет явно выраженную зависимость от температуры нагрева.

In the work, using the method of in-situ measurements of X-ray diffraction patterns, the stability of the phase composition, as well as the structural parameters of Si3N4 ceramics, was studied in a wide temperature range from 25 to 1400 ℃, covering the range of operating temperatures during the use of ceramics in extreme conditions. The main aim of this study is to determine the phase and structural changes in Si3N4 ceramics as a result of thermal effects, as well as to determine the role of thermal effects on the structural features of ceramics associated with thermal expansion. During the experiments it was established that thermal heating of samples in a vacuum does not lead to the initialization of oxidation processes characteristic of heat treatment of Si3N4 ceramics in air, which are accompanied by the formation of the oxide phase SiO2. At the same time, the assessment of the weight contributions of the established phases in the composition of ceramics revealed the absence of any significant alterations in the phase ratio in the entire measured range of annealing temperatures. Based on changes in the volumes of the crystal lattice of both phases in the composition of Si3N4 ceramics, the value of the thermal volume expansion coefficient was determined depending on the exposure temperature. It was found that the average value of the βV(T) coefficient is about 8.5–10·10−6 K−1 for both established phases in the composition, while in the case of the α-Si3N4 phase, the change in the βV(T) value has a clearly expressed dependence on the heating temperature.

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