Synthesis and Spark Plasma Sintering of Microcrystalline Thorium Dioxide for Nuclear Fuel Products

Shichalin, O.O.; Frolov, K. R.; Buravlev, I. Yu.; Tananayev, I. G.; Faizova, V. V.; Azon, S.A.; Андреева, Н. И.; Папынов, Е. К.

doi:10.1134/s0036023620080148

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Then the Vickers hardness, thermal conductivity, and thermal expansion coefficient of ThO 2 ceramic prepared in this work were all measured to further evaluate its density. The results show that the Vickers hardness of ThO 2 ceramic sintered at 1590°C for 6 h was as high as 866.38 HV (8.49 GPa) under a load of 1 kg, which was higher than the hardness of the ThO 2 ceramic prepared by the SPS sintering method 35 and further indicated the high densification of the sintered ceramic.…”

Section: Resultsmentioning

confidence: 86%

A simple method for preparing ThO₂ ceramics with high density

Song

Guan

Peng

et al. 2022

Int J Applied Ceramic Tech

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A simple and effective method for preparing ThO2 ceramics with high density has been proposed. It mainly includes a positive precipitation approach and a conventional sintering process. The SEM images and laser particle size analysis show that the prepared powder exhibits a round‐plated shape with a uniform and narrow particle size distribution, which is the key to the densification sintering of ThO2 ceramics. The XRD analyses confirm that the ThO2 ceramics sintered at 1590°C were composed of cubic fluorite phase. The effect of sintering temperature on the density of ThO2 ceramics was also investigated, and a relative density higher than 95% were achieved after sintering at 1590°C for 6 h in an air atmosphere. Moreover, the Vickers hardness was up to 8.49 GPa, the average linear expansion coefficient within 40–800°C was low to 10.97 × 10−6/K, and the thermal conductivity and the thermal diffusivity were both higher than most of traditional ceramic materials (16.94–5.86 W/m K and 7.28–1.28 mm2/s, respectively, within the temperature range of 25–800°C). The previous great performances are closely related to its high density, which enables it to be a great candidate for nuclear fuels and other potential application fields.

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Section: Resultsmentioning

confidence: 86%

A simple method for preparing ThO₂ ceramics with high density

Song

Guan

Peng

et al. 2022

Int J Applied Ceramic Tech

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“…Nanocrystalline oxides can be synthesized by oxalate precipitation and thermal conversion 26 . This inexpensive and robust synthetic route can be widely applied even on the industrial scale, but some properties and advantages are yet to be revealed.…”

Section: Introductionmentioning

confidence: 99%

“…Nanocrystalline oxides can be synthesized by oxalate precipitation and thermal conversion. 26 This inexpensive and robust synthetic route can be widely applied even on the industrial scale, but some properties and advantages are yet to be revealed. Previous studies in the CeO 2 -Gd 2 O 3 system preparation are based mostly on hydrolysis of metal cations in a solution 27 and solid solution is formed later upon calcination by diffusion.…”

Section: Introductionmentioning

confidence: 99%

Transition between two solid‐solutions: Effective and easy way for fine Ce₁₋_xGd_xO₂₋_x_/2 powders preparation

et al. 2022

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Ceria, pure or doped, is an important electrolyte material in solid oxide fuel cells, catalysts, and plutonium surrogates. Even though ceria is a widely studied material, its coprecipitation with the most common doping element, gadolinium, remains mostly overlooked. Here, we present a comprehensive study of gadolinium–cerium oxalates prepared by coprecipitation of gadolinium (III) and cerium (III) salts by oxalic acid under different reaction conditions and element ratios. For this purpose, we assessed the effects of basic precipitation conditions on the final oxalate size, shape, and conversion into the corresponding oxides. The results showed that coprecipitation with oxalic acid yields and ideal solid solution, which translates into the oxides. This low‐cost and straightforward synthetic route provides then high‐quality solid solutions of Ge–Gd in the oxide lattice. Thus, this approach has a high industrialization potential, with significant advantages over hydrolysis or hydrothermal techniques.

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The co-precipitation method in the production of thorium oxide and uranium–thorium mixed oxide fuels − A review

Bagheri,

Nosratinia,

Zahakifar

et al. 2024

Nuclear Engineering and Design

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Synthesis and Spark Plasma Sintering of Microcrystalline Thorium Dioxide for Nuclear Fuel Products

Cited by 5 publications

References 22 publications

A simple method for preparing ThO₂ ceramics with high density

A simple method for preparing ThO₂ ceramics with high density

Transition between two solid‐solutions: Effective and easy way for fine Ce₁₋_xGd_xO₂₋_x_/2 powders preparation

The co-precipitation method in the production of thorium oxide and uranium–thorium mixed oxide fuels − A review

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Synthesis and Spark Plasma Sintering of Microcrystalline Thorium Dioxide for Nuclear Fuel Products

Cited by 5 publications

References 22 publications

A simple method for preparing ThO2 ceramics with high density

A simple method for preparing ThO2 ceramics with high density

Transition between two solid‐solutions: Effective and easy way for fine Ce1−xGdxO2−x/2 powders preparation

The co-precipitation method in the production of thorium oxide and uranium–thorium mixed oxide fuels − A review

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A simple method for preparing ThO₂ ceramics with high density

A simple method for preparing ThO₂ ceramics with high density

Transition between two solid‐solutions: Effective and easy way for fine Ce₁₋_xGd_xO₂₋_x_/2 powders preparation