CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Meng Zhao,Xiaorui Ren,Jun Yang,Wei Pan
A series of ThO 2 -doped Y 2 O 3 stabilized ZrO 2 monolith compounds were prepared and investigated. The bigger ionic radius of Th 4+ substitutions dilutes the average oxygen coordination to the cations, which is the determinant factor of the phase stability. Therefore, ThO 2 incorporation has a strong impact on the phase composition, and consequently on the thermo-mechanical properties of the specimens. The metastable t′ phase was stabilized in light-doped specimens with a decreasing tetragonality while the thermodynamic equilibrium t phase and the related martensitic t–m phase transformation were absent in ThO 2 -doped specimens. Additionally, lower thermal conductivity was also achieved due to the substitutional phonon scattering effect. Considering the phase stability and thermo-mechanical properties, ThO 2 -doped Y 2 O 3 stabilized ZrO 2 compounds may be promising candidates for thermal barrier coatings although further research may be needed to improve their mechanical properties.
研究领域:
材料科学
·
热物理
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Deng Zhe-Zhe,Peng Ying,Xie Yong-Shuai,Zeng Cheng,Li Xin-Hao,Li Jia,Zhu Lu-Yi,Liu Xiao-Long
Thorium dioxide (ThO 2 ) fibers exhibit exceptional structural stability, low density and superior flexibility, coupled with a remarkably high melting point, positioning them as promising candidates for thermal protection applications. Additionally, their commendable secondary processing characteristics enable the development of diverse composite materials when integrated with other materials, significantly broadening the potential utilization of ThO 2 materials and thorium resources in industrial fields. In this work, the ThO 2 fiber was fabricated by the sol–gel precursor method, and the precursor with good spinnability and excellent stability was synthesized for the first time. The ThO 2 fiber with a mean diameter of 868 nm is both highly flexible and strong (max. tensile strength 2.21 MPa), capable of bending freely across a wide temperature range from − 196 °C (in liquid nitrogen) to 1200 °C. Meanwhile, it exhibits excellent temperature stability and heat insulation properties. The ThO 2 nanofiber membranes with layered structure have low density (32–37 mg·cm −3 ), low thermal conductivity (27.3–30.1 mW·m −1 ·K −1 @25 °C). The ThO 2 nanofiber membranes with 15 mm thickness can reduce the temperature from 1200 to 282 °C and maintain a high aspect ratio and bendability after 1200 °C@90 min. The results show that the ThO 2 fiber can be used as a new kind of high-temperature resistant material. Graphical abstract
研究领域:
材料科学
·
核能工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 27
·17012-17019
·
IF 4.036
Yubing Xue,Dashu Pan,Feng Zuo,Songtao Xiao,Xiang Li,Fuyan Lou,Mingming Li,Yinggen Ouyang
A novel self-reactivated catalyst Pt–ThO2/C was prepared for the first time by selecting radioactive material ThO2 as the catalytic additive to address the low activity and toxicity of the anode Pt/C catalyst in a direct ethanol fuel cell. The catalytic activity and resistance to CO poisoning of Pt-6.67 wt%ThO2/C were found to be superior to those of Pt/C–NaBH4 in electrochemical workstation and single-cell tests. It is speculated that the exist of ThO2 not only improves the catalytic activity via the synergistic effect of Pt and Th, but also produces a large amount of radiolysis products, OH radicals, due to 232Th which oxidatively desorbs CO from Pt–COads and solves the CO poisoning problem.
研究领域:
材料科学
·
能源化学
·
放射化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 2
·1194-1204
·
IF 2.328
Song Qi,Fang Guan,Dan Peng,Xuyi Zhang,Wuping Liao
A simple and effective method for preparing ThO 2 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 ThO 2 ceramics. The XRD analyses confirm that the ThO 2 ceramics sintered at 1590°C were composed of cubic fluorite phase. The effect of sintering temperature on the density of ThO 2 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 mm 2 /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.
研究领域:
材料科学
·
核材料
·
陶瓷学
·
无机非金属材料
·
固态化学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 39
·e202202129
·
IF 2.307
Ting Yu,Zhenghua Qian,Lin Li,Zonghui Lu,Bin Li,Qiang Zhang,Xiaofeng Liu,Hui He,Yanbo Qiao,Guoan Ye
Graphical This is a new method of producing nuclear material. ThO 2 NPs are synthesized by pyrolysis of an undiscovered thorium-based MOF. The MOF-derived ThO 2 NPs can easily be sintered to form ThO 2 ceramics. (Twitter: @yuting0437) A new method is demonstrated for synthesizing thorium dioxide (ThO 2 ) nanoparticles (NPs) by thermal decomposition of an undiscovered thorium-based metal-organic framework (MOF). Upon heating at 520 °C, the thorium-based MOF crystals, designated Th-MTB, are converted completely to ThO 2 NPs with an average size of 150 nm. The MOF-derived ThO 2 NPs are easily sintered to form ThO 2 ceramics which have good thermal conductivity. The crystalline grains of ThO 2 grow continuously during sintering.The method for the synthesis of ThO 2 NPs could have potential applications in the production of nuclear materials.
研究领域:
材料科学
·
核材料
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）