Research of Structural, Strength and Thermal Properties of ZrO2—CeO2 Ceramics Doped with Yttrium

Giniyatova, Sh.; Sailaukhanov, Nurzhan A.; Nesterov, Eugeniy; Zdorovets, Maxim V.; Kozlovskiy, Artem L.; Shlimas, Dmitriy I.

doi:10.3390/cryst12020242

Cited by 8 publications

(10 citation statements)

References 34 publications

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“…As can be seen from the data presented, phase transformations lead to an increase in the structural ordering degree, whereas a change in the size of crystallites is also observed, which can be due to processes associated with the rearrangement of the crystal structure as a result of a change in the phase composition of ceramics. At the same time, a decrease in the size of crystallites with a change in the phase composition leads to a change in the dislocation density in the structure of ceramics, an increase in which can have a significant effect on the strength properties of ceramics [28,29]. As it is known, a change in the dislocation density can cause the so-called effect of dislocation hardening, due to a decrease in the probability of propagation of microcracks that occur under external influences.…”

Section: Resultsmentioning

confidence: 99%

“…Interest in nanosized ceramics is also due to the possibility of increasing strength by changing the dislocation density, as well as to interboundary effects associated with the presence of several phases in the structure. The most promising dopants among oxide ceramics are cerium oxide (CeO 2 ) or magnesium oxide (MgO), which have excellent properties, and in combination with the properties of ZrO 2 , it makes it possible to create new two-phase ceramics with high resistance to external influences [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Phase Transformations and Strength Properties of Nanostructured (1 − x)ZrO2 − xCeO2 Composite Ceramics

et al. 2022

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The aim of this work is to study the properties of nanostructured (1 − x)ZrO2 − xCeO2 composite ceramics, depending on the content of oxide components, as well as to establish the relationship between the phase composition of ceramics and strength properties. The choice of (1− x)ZrO2 − xCeO2 composite ceramics as objects of study is due to the great prospects for using them as the basis for inert matrix materials for nuclear dispersed fuel, which can replace traditional uranium fuel in high-temperature nuclear reactors. Using X-ray diffraction, it was found that the variation of the oxide components leads to phase transformations of the Monoclinic-ZrO2 → Monoclinic − Zr0.98Ce0.02O2/Tetragonal − ZrO2 → Tetragonal − Zr0.85Ce0.15O2 → Tetragonal − ZrCeO4/Ce0.1Zr0.9O2 type. As a result of mechanical tests, it was found that the formation of tetragonal phases in the structure of ceramics leads to strengthening of ceramics and an increase in crack resistance, which is due not only to an increase in the crystallinity degree, but also to the effect of dislocation hardening associated with a decrease in grain size. It has been established that a change in the phase composition due to phase transformations and displacement of the ZrO2 phase from the ceramic structure with its transformation into the phase of partial replacement of Zr0.85Ce0.15O2 or Ce0.1Zr0.9O2 leads to the strengthening of ceramics by more than 3.5–4 times. The results of resistance to crack formation under single compression showed that the formation of the ZrCeO4 phase in the structure of ceramics leads to an increase in the resistance of ceramics to cracking by more than 2.5 times.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis, Phase Transformations and Strength Properties of Nanostructured (1 − x)ZrO2 − xCeO2 Composite Ceramics

et al. 2022

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“…18,135 ZrB 2 , an ultrahightemperature ceramic, is often used with ZrO 2 in hightemperature equipment such as high-temperature electrodes and crucibles. 136 In addition, ZrO 2 -CeO 2 ceramics synthesized by Zdorovets and coworkers 137,138 are expected to be used in nuclear materials.…”

Section: 22mentioning

confidence: 99%

“…The small particle size of mechanically activated powders and the high defect density in the particles make it possible to prepare ceramics with close theoretical densities (up to 99%) and high hardness (up to 13 GPa) at temperatures of 200°C–300°C. The effects of CeO 2 , 149 Y 2 O 3 , 137 and Y(NO 3 ) 3 ·6H 2 O 138 dopants on the properties of ZrO 2 –CeO 2 powder have been studied. A solid solution was formed after adding CeO 2 agent, which improved amorphization and grain refinement.…”

Section: Mechanochemical Synthesis Of Oxide Ceramic Powdersmentioning

confidence: 99%

Mechanochemical synthesis of nanostructured and composite oxide ceramics: From mechanisms to tailored properties

Zhang,

Xu,

Zhang

et al. 2023

Int J Applied Ceramic Tech

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Mechanochemical synthesis is a technology formed in the 1950s. By applying mechanical energy, mechanochemical synthesis stimulates chemical reactions, causing structural and phase changes and enabling difficult or otherwise impossible reactions to occur. Mechanochemical reactions are relatively safe, clean and efficient. At present, the synthesis of oxide ceramic materials by mechanochemical methods has attracted widespread attention. In the production of oxide ceramic materials, the characteristics of ceramic powder have a certain influence on the molding, sintering, microstructure, and mechanical properties of subsequent ceramics. In this paper, the research progress of mechanical chemistry in the synthesis of nanostructures and composite oxide ceramic powders is reviewed. The effects of process parameters such as ball milling time, speed, atmosphere, grinding media, additives, and ball‐to‐powder ratio on reaction kinetics, phase formation, and powder properties are summarized. In addition, challenges and opportunities for ceramic powder synthesis are also discussed.

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“…At the same time, great prospects for a new type of nuclear fuel are assigned to plutonium, the use of which, unlike uranium, does not lead to the accumulation of actinides, which reduces the risk of accumulation of radioactive waste during operation and allows processing of weapons-grade plutonium, which is available in sufficient quantities. However, an increase in efficiency due to the burnup of nuclear fuel imposes additional requirements on the materials of inert matrices, which consist of increased radiation resistance to damage and maintaining resistance to subsequent mechanical impacts [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Study of Radiation Resistance of WO3 Microparticles under Irradiation with Heavy Kr15+ and Xe22+ Ions

et al. 2022

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In this work, we consider the effect of irradiation with heavy Kr15+ and Xe22+ ions on the change in the structural and strength properties of WO3 microparticles, which are among the candidates for inert matrix materials. Irradiation with heavy Kr15+ and Xe22+ ions was chosen to determine the possibility of simulation of radiation damage comparable to the impact of fission fragments. During the studies, it was found that the main changes in the structural properties with an increase in the irradiation fluence are associated with the crystal lattice deformation and its anisotropic distortion, which is most pronounced during irradiation with heavy Kr15+ ions. An assessment of the gaseous swelling effect due to the radiation damage accumulation showed that a change in the ion type during irradiation leads to an increase in the swelling value by more than 8–10%. Results of strength changes showed that the most intense decrease in the hardness of the near-surface layer is observed when the fluence reaches more than 1012 ion/cm2, which is typical for the effect of overlapping radiation damage in the material. The dependences obtained for the change in structural and strength properties can later be used to evaluate the effectiveness of the use of refractory oxide materials for their use in the creation of inert matrices of nuclear fuel.

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Research of Structural, Strength and Thermal Properties of ZrO2—CeO2 Ceramics Doped with Yttrium

Cited by 8 publications

References 34 publications

Synthesis, Phase Transformations and Strength Properties of Nanostructured (1 − x)ZrO2 − xCeO2 Composite Ceramics

Synthesis, Phase Transformations and Strength Properties of Nanostructured (1 − x)ZrO2 − xCeO2 Composite Ceramics

Mechanochemical synthesis of nanostructured and composite oxide ceramics: From mechanisms to tailored properties

Study of Radiation Resistance of WO3 Microparticles under Irradiation with Heavy Kr15+ and Xe22+ Ions

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