Mechanical Properties and Thermal Shock Resistance of Fine-Grained Nd:YAG/SiC Ceramics

Alekseeva, L. S.; Нохрин, А. В.; Karazanov, K. O.; Орлова, А. И.; Болдин, М. С.; Lantsev, E. A.; Мурашов, А. А.; Чувильдеев, В. Н.

doi:10.1134/s0020168522020017

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…This phenomenon plays a crucial role in promoting mass transfer during the sintering process, which significantly contributes to the densification of the silicon carbide ceramic materials. As a result, the mechanical properties of the ceramic materials are improved [ 36 , 37 ]. However, there are few reports on the application of YAG as a sintering additive in the hot pressing sintering of silicon carbide ceramics for dry gas seals.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

Zou,

Ou,

Zhou

et al. 2024

Materials

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Silicon carbide (SiC) ceramics with high bending strength were prepared by hot pressing sintering (HPS) with yttrium aluminum garnet (Y3Al5O12, YAG) as sintering additive, and the effects of YAG content and sintering temperature on the sintering behavior, microstructure and mechanical properties of SiC ceramics were investigated in detail. The uniform distribution of YAG to form a liquid phase and the driving force provided by hot pressing sintering decrease the sintering temperature, improve the densification of SiC ceramics, and refine the crystal size. By means of suitable sintering conditions with the additional amount of YAG of 5 wt%, the sintering temperature of 1950 °C and a pressure of 30 MPa, the resultant SiC/YAG composite ceramics possesses high sintering and mechanical properties with the relative density of 98.53%, the bending strength of 675 MPa, the Vickers hardness of up to 17.92 GPa, and the elastic modulus of 386 GPa. The as-prepared SiC/YAG composite ceramics are promisingly used as the dry gas seal materials in the centrifugal compressors.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

Zou,

Ou,

Zhou

et al. 2024

Materials

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“…В большинстве случаев для данных целей предлагается использовать технологию дисперсного ядерного топлива. В основе предлагаемой технологии лежит размещение делящегося ядерного топлива (плутония или диоксид урана) в инертной матрице на основе тугоплавких высокотемпературных керамик, так, чтобы частицы делящегося топлива не соприкасались друг с другом и были изолированы достаточной толщиной инертного материала, способного поглотить продукты деления [6][7][8]. В свою очередь использование тугоплавких керамик на основе оксидных или нитридных соединений, обладающих высо-кой температурой плавления (более 1500-2000 °С), а также низким коэффициентом теплового расширения позволяет существенно увеличить рабочую температуру активной зоны [9,10].…”

Section: Introductionunclassified

INVESTIGATION OF PHASE FORMATION PROCESSES IN COMPOSITE Al2O3-Si3N4 CERAMICS WITH VARIATIONS OF SINTERING TEMPERATURE

Borgekov

Kozlovskiy

2023

jour

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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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“…В случае разработки и дальнейшего использования подобной концепции дисперсного ядерного топлива большое внимание долж-но быть уделено материалам, использующимся в качестве инертной матрицы [5]. Основными требованиями к данным материалам являются: высокая совместимость с большинством конструкционных материалов, высокие показатели прочностных и теплофизических характеристик, устойчивость к тепловому расширению и полиморфным превращениям в случае внешних воздействий, радиационная стойкость и инертность к процессам, связанным с накоплением радиационно-индуцированных дефектов [6,7]. Также в последнее время одним из требований к материалам инертных матриц является показатель температуры плавления и устойчивости к температурному нагреву в течение длительного времени.…”

Section: Introductionunclassified

Study of Phase Formation Processes in Cer-Cer Type Inert Matrices Based on Oxide Compounds

Kenzhina

Shaimerdenov²,

Tolenova

et al. 2022

jour

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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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Mechanical Properties and Thermal Shock Resistance of Fine-Grained Nd:YAG/SiC Ceramics

Cited by 12 publications

References 18 publications

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

INVESTIGATION OF PHASE FORMATION PROCESSES IN COMPOSITE Al<sub>2</sub>O<sub>3</sub>-Si<sub>3</sub>N<sub>4</sub> CERAMICS WITH VARIATIONS OF SINTERING TEMPERATURE

Study of Phase Formation Processes in Cer-Cer Type Inert Matrices Based on Oxide Compounds

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