CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dongbo Zhang,Ning Wang,Xinyue Tang,Jiangrong Yan,Yongsheng Zhang
High-entropy oxides (HEOs) are promising materials for thermal barrier coatings (TBCs). In this study, a new type of TBC material, that is, (La 0.5 Gd 0.5 ) 2 (Ce 0.2 Nb 0.2 Yb 0.2 Ta 0.2 Zr 0.2 ) 2 O 7 [(LG)(CNYTZ)O] pyrochlore-structured HEO was designed and synthesized. The results showed that the structure of the (LG)(CNYTZ)O HEO synthesized at 1400 °C for 6 h was pure phase pyrochlore oxide. The microstructures of the (LG)(CNYTZ)O HEO solid specimens were studied after sintering at different temperatures (1500, 1520, 1540, 1550, 1560, 1580, and 1600 °C) for 6 h, respectively. The optimal sintering temperature was determined to be 1550 °C. The properties of the (LG)(CNYTZ)O HEO specimen sintered at 1550 °C for 6 h were tested. Its direct and indirect optical bandgap widths were determined to be 3.05 and 2.52 eV, respectively, from its UV–visible diffuse reflectance spectroscopy profile. Its infrared spectrum was recorded at 1100 °C, which confirmed its excellent high-temperature thermal radiation-shielding properties. Its thermal conductivity was determined in the temperature range of 30–1000 °C after correction for porosity, using the laser flash method, and was found to be in the range of 0.91–1.00 W m −1 K −1 . Its coefficient of thermal expansion ranged from approximately 7.47 × 10 −6 k −1 to 10.36 × 10 −6 k −1 in the temperature of 100–1000 °C. It also exhibited excellent thermophysical properties. Its hardness was in the range of 6.76–7.46 GPa, and its average hardness was measured to be 7.11 GPa using a microhardness tester, while its fracture toughness was in the range of 1.81–2.31 MPa m 1/2 , and its average fracture toughness was 2.06 MPa m 1/2 , respectively. These results indicate that the (LG)(CNYTZ)O HEO can be considered a suitable candidate material for TBCs.
研究领域:
材料科学
·
无机化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Zongmin Hu,Sheng Chang,Chun Cheng,Chen Sun,Jingrui Liu,Tingting Meng,Yimin Xuan,Meng Ni
Converting low-grade heat into electricity improves energy efficiency, reduces thermal pollution, and contributes to sustainability. However, the low thermal voltage, thermopower, or conversion efficiency of current monovalent-ion-based thermocells severely impede their application. Herein, we propose a new multivalent-ion-based calcium-ion thermal charging cell (CTCC) by introducing the concept of calcium-ion batteries into a thermoelectric system which demonstrates an ultrahigh thermopower of 25.2 mV K −1 through the synchronous thermo-extraction effect of oleic acid-treated Ca 0.24 V 2 O 5 ·H 2 O electrode and thermodiffusion effect of electrolyte. The appealing calcium-ion energy carrier, favorable aqueous Ca(CF 3 SO 3 ) 2 electrolyte, and facile oleic acid modification strategy can ensure potentially higher voltage, enable fast diffusion kinetics, and prevent vanadium species from dissolution. As a result, the CTCC achieves ultrahigh thermal voltage of 1.149 V and Carnot-relative efficiency of 24.42% (± 0.22%) at a temperature difference of 45 K. This work enriches the multivalent-ion-based thermocell classes for efficient heat-to-electricity conversion in sustainable energy utilization.
研究领域:
能源科学
·
材料科学
·
热电技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Weijun Wang,Xihang Pei,Xintian Li,Wei Wen
Thermal barrier coatings improve the energy efficiency of industrial and aerospace gas turbines by increasing operating temperatures. In this study, two types of high-entropy thermal barrier coating materials were synthesized by solid-phase reactive sintering: (La 0.2 Nd 0.2 Gd 0.2 Yb 0.2 Y 0.2 ) 2 Ce 2 O 7 (5RC) and (La 0.2 Nd 0.2 Gd 0.2 Yb 0.2 Y 0.2 ) 2 CeZrO 7 (5RCZ). Both samples remain in a single-phase fluorite structure after annealing at 1400 °C for 100 h, showing excellent phase stability. Specifically, 5RC exhibits no chemical reaction with α-Al 2 O 3 following annealing at 1200 °C for 4 h and demonstrates outstanding chemical compatibility. The thermal expansion coefficients (TECs) for 5RC and 5RCZ are 11.5 × 10 −6 K −1 and 10.4 × 10 −6 K −1 at 1200 °C, respectively. Furthermore, the TEC of 5RCZ shows stable performance, demonstrating no significant fluctuations at lower temperatures. Due to the high entropy effect and lattice distortion, 5RC and 5RCZ exhibit excellent thermal insulating properties. At low-temperature range, 5RCZ has lower thermal conductivity than 5RC due to a more significant disorder in ion radius and atomic mass. At 1200 °C, the thermal conductivity of 5RCZ (1.406 W m −1 K −1 ) is greater than that of 5RC (1.263 W m −1 K −1 ), likely because of 5RC's higher infrared emissivity. In conclusion, the high-entropy rare earth ceramics 5RC and 5RCZ exhibit significant potential for use as thermal barrier coating materials.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yang Li,Peicheng Li,Han Yu,Xuemei Diao,Panpan Liu,Zhiyong Zhao,Xiao Chen
To cope with the demand of more complex and variable applications, it is urgent to develop dual-mode triggered, breathable, and shape-memory wearable heaters for all-weather personal thermal management of composite phase change materials (PCMs). Herein, after high-temperature carbonization of ZnCo-MOF (metal–organic framework) nanosheet array grown in situ on flexible and breathable carbon cloth (CC) and subsequent encapsulation of polyethylene glycol (PEG), the as-prepared PEG/CC@Co/CNT (carbon nanotube) composite PCMs exhibited good breathability, mechanical strength (tensile strength of 9.15 MPa), thermal energy storage density (114.19 J/g), and shape memory due to the synergy of flexible CC skeleton and rigid PEG. More importantly, composite PCMs possessed excellent solar-thermal (93.7 %, 100 mW/cm 2 ) and electro-thermals (94.5 %, 2.0 V) conversion and storage capacity, benefiting from the conjugation effect of high graphitized carbon/carbon heterostructure with fast electron/photon/phonon transmission and the localized surface plasmon resonance effect of Co nanoparticles. Therefore, the integration of solar heating and Joule heating into breathable composite PCMs can be accurately used for next-generation all-weather, all-season, dual-mode triggered personal thermal management, including indoor/outdoor, daytime/night, rainy/cloudy and other complex and changeable scenarios.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Linqiang Wang,Jiabao Feng,Hong Zhu,Yadong Lv,Qi Yang,Guangxian Li,Miqiu Kong
With the progression of electronic components toward high performance, miniaturization, integration, and increased power, efficient heat dissipation has become essential for maintaining performance and extending service life. To address this significant academic and industrial challenge, thermal interface materials (TIMs) with high thermal conductivity are indispensable. This study presents a bottlebrush polymer with a polymethylvinylsiloxane backbone grafted with octadecanethiol side chains (PMVS-ODT), utilized in conductive PMVS-ODT/Al 2 O 3 composites. These composites demonstrate superior thermal conductivity, improved thixotropy, and low contact thermal resistance ( R c ), outperforming conventional PDMS/Al 2 O 3 composites. The low-viscosity bottlebrush PMVS-ODT can compounded with Al 2 O 3 through a simple and scalable mechanical blending process, enabling Al 2 O 3 loadings as high as 87.8 vol.%. Strong interactions between PMVS-ODT and Al 2 O 3 , along with the compliance and thixotropic properties of PMVS-ODT/79.4 vol.% Al 2 O 3 composites, enhance the thermal conductivity to 8.181 W/(m·K) and reduce the R c to 20.9 mm 2 K/W (20 psi). These results represent increases of 79.9% and decreases of 64.6%, respectively, compared to traditional PDMS/Al 2 O 3 composites. Additionally, significantly enhanced thermal management performance is demonstrated for PMVS-ODT/Al 2 O 3 composites when applied as heat dissipation materials for computer CPUs and LED light modules. This matrix structure design offers an effective strategy for developing high-performance polymer-based TIMs suitable for next-generation advanced electronic applications.
研究领域:
材料科学
·
高分子化学
·
热管理工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Kun Zhang,Xiaochuan Wang,Hongxing Li,Xueting Zhao,Guangzu Zhang,Changlong Tan,Yanxu Wang,Bing Li
Minimizing the utilization of fossil fuels and mitigating CO 2 emissions are two of the most significant worldwide concerns in the current century. The pervasive waste heat not only results in great energy wastage but also poses a great environmental concern. Typical phase change materials (PCMs) suffer from uncontrolled thermal energy utilization as a result of spontaneous heat loss. We provide a new approach to thermal energy storage that challenges the traditional notion of minimizing hysteresis in solid-state refrigeration using PCMs. Instead, we introduce a second stimulus, such as uniaxial stress, magnetic field, electric field, or hydrostatic pressure, to take advantage of the hysteresis phenomenon. This enables us to prevent spontaneous heat loss by implementing a hysteresis energy barrier when the PCMs come into contact with cooler surroundings. Additionally, we may actively regulate the release of thermal energy using a secondary stimulus. The technological viability of these thermal batteries is proven through the utilization of TiNiNb, MnNiCoGeSi, BaTiO 3 , and neopentylglycol, respectively. Notably, by machine-learning-guided design, Ni 50 Ti 40 Zr 8.75 Nb 1.25 alloy was prepared and shown to be an outstanding choice for thermal batteries due to its appropriate and exceptionally broad working temperature range (71 K). Our study offers a new strategy for developing thermal energy storage materials and it is anticipated to greatly enhance the utilization of waste heat.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Zhang Dongbo,Tang Xinyue,Wang Ning,Xiao Mingwei,Yan Jiangrong,Zhang Yongsheng
High-entropy oxides used as thermal barrier coating materials have attracted considerable attention from scientific communities owing to their unique properties, such as low thermal conductivity and good stability at high temperatures. In this study, a new (La 0.2 Gd 0.2 Zr 0.2 Ce 0.2 Ho 0.2 )O 2-δ ((LGZCH)O) fluorite-structured high-entropy oxide was successfully synthesized through a solid-state reaction at 1400 °C. The resulting material demonstrated good phase stability after sintering at high temperatures. The microstructure, microscopic morphology, ionic valence, compositional distribution, optical properties, thermal conductivity, thermal expansion properties, and mechanical properties of (LGZCH)O were investigated. X-ray diffraction results showed that the (LGZCH)O fluorite-structured high-entropy oxide exhibited good stability during sintering at different temperatures with an optimum sintering temperature of 1580 °C. Ce 4+ converted to Ce 3+ at high temperatures. Scanning electron microscopy results showed that the material had a high porosity of approximately 28.9% after sintering at 1580 °C. (LGZCH)O had a higher infrared radiation emissivity of 82.2%-87.6% in the range of 2.5-6.0 μm indicating that it had better thermal radiation shielding performance. After porosity modification, the thermal conductivity ranged from 1.27 to 1.00 W m −1 K −1 from room temperature to 1000 °C, which is considerably lower than that of yttria-stabilized zirconia. Additionally, (LGZCH)O exhibited low coefficients of thermal expansion measuring 9.65 × 10 −6 K −1 and 10.13 × 10 −6 K −1 at 1000 and 1200 °C, respectively. The hardness and Young’s modulus of the bulk (LGZCH)O measured via nanoindentation tests were 8.86 GPa and 153.98 GPa, respectively, which are marginally inferior to those of YSZ. Therefore, (LGZCH)O can be considered a promising candidate material for thermal barrier coatings.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiaoshan Zhang,Bing Wang,Nan Wu,Cheng Han,Yingde Wang
Ceramic fibers are one of the most important high-temperature thermal insulating materials for application in the harsh environment. However, the practical use of traditional ceramic fibers has been largely impeded by their poor thermal stability or high thermal conductivity at high-temperatures. Here, multi-phase SiZrOC (SiO x C y , SiO 2 , ZrO 2 , ZrSiO 4 and C) nanofiber (NF) was rationally designed and prepared according to the intrinsic factors of these phases with lower heat transfer effects (significant phonon scattering and infrared shielding) that contributes to the high-temperature thermal insulation performance in ceramic fibers. Owing to the unique multi-phase microstructure, the obtained SiZrOC NFs exhibit ultralow thermal conductivity (~0.043 W m −1 K −1 at 25 °C and ~0. 233 W m −1 K −1 at 1400 °C), high flexibility, good mechanical strength, excellent fire resistance and thermal stability even up to 1400 °C, which makes it an ideal high-temperature thermal insulator especially for applications under extreme conditions. This work not only presents with the fabrication of a prosperous material for high-temperature thermal insulation but also offers a novel strategy for developing a wider range of high-temperature thermal insulating materials.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Longkang Cong,Shouyang zhang
High-entropy oxides (HEOs) are considered promising thermal barrier coating (TBC) materials due to their unique thermophysical performances induced by the entropy effects. In this work, (La 0.2 Ce 0.2 Pr 0.2 Sm 0.2 Eu 0.2 ) 2 Hf 2 O 7 high entropy hafnate, as a thermal barrier coating (TBC) material, was successfully synthesized by solution combustion method for the first time. From the X-ray diffraction, scanning electron microscopy, and transmission electron microscopy results, it is confirmed that (La 0.2 Ce 0.2 Pr 0.2 Sm 0.2 Eu 0.2 ) 2 Hf 2 O 7 has pure single-phase ordered pyrochlore structure with highly homogeneous composition at both micrometer and nanometer scales. The synthesized (La 0.2 Ce 0.2 Pr 0.2 Sm 0.2 Eu 0.2 ) 2 Hf 2 O 7 possesses excellent phase stability at 1600 °C and demonstrates a low thermal conductivity (1.0–1.24 W·m −1 ·K −1 ) which is lower than those of rare earth hafnates (RE 2 Hf 2 O 7 , RE = La, Ce, Pr, Sm, Eu). Therefore, it provides a new perspective and potential to prompt the next generation TBC materials with better performance.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Kailong Yang,Lin Chen,Fushuo Wu,Qi Zheng,Jianyu Li,Peng Song,Yanfei Wang,Rongjun Liu,Jing Feng
Monoclinic (m) and monoclinic-prime (m′) phases of Yb(Ta x Nb 1− x )O 4 ceramics were synthesized successfully, and the relationships between the crystal structures and the thermophysical properties were investigated by various methods. A ferroelastic domain existed in the m-Yb(Ta x Nb 1- x )O 4 ceramics, as observed by a scanning electron microscopy, which suggests that a ferroelastic phase transition occurred. The minimum thermal conductivity of the Yb(Ta x Nb 1− x )O 4 ceramics was 1.49 W m −1 ·K −1 , whereas the maximum thermal expansion coefficient (TEC) was 10.6 × 10 −6 K −1 (1200 °C). The m-phase had a lower Young's modulus (110–132 GPa) than the m′-phase (133–140 GPa). In view of the low thermal conductivity and high TEC, Yb(Ta x Nb 1− x )O 4 ceramics have the potential to be high-temperature structural ceramics .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2013
·
IF 2.379
Chun-Mei Qi,Li-Sheng Wang,Jun-Chao Du,Guo-Min Yu,Gui-Qin Sun
1,2-Bis (2-oxo-5,5-dimethyl-1,3,2-dioxyphosphacyclohexyl-2-imino) ethane (BPEA) was prepared, and characterized by elemental analysis (EA), mass spectra (MS), infrared spectroscopy (IR) and nuclear magnetic resonance (NMR). The melting point and the enthalpy of fusion of BPEA were performed on differential scanning calorimetry (DSC), and the thermal stability of BPEA was tested by thermogravimetric analysis (TGA). The solubility of BPEA in selected solvents was measured by a static analytical method. The experimental data were correlated with different thermodynamic models, such as the empirical equation and non-random two liquid (NRTL), Wilson, Scatchard–Hildebrand, and universal quasi chemical (UNIQUAC) equations. The calculated results showed good agreement with the experimental data in the temperature range studied.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jie Zhang,Yueqi Huang,Baijun Yan
(Sm 1- x Gd x ) 2 Zr 2 O 7 (0≤x≤1) ceramics, a new thermal barrier coating material, are commonly synthesised by chemical coprecipitation and calcination methods. However, when using the chemical coprecipitation method to synthesise ceramic powder, a large amount of strong acids and ammonium hydrate are consumed, leading to environmental pollution and restricting the production of new ceramics. Thus, a cleaner one-step hydrothermal synthesis method is proposed to synthesise (Sm 1- x Gd x ) 2 Zr 2 O 7 (0≤x≤1) thermal barrier coating ceramic powders, which avoids the use of strong acids and reduces the use of ammonium hydrate. Using this cleaner method, pure (Sm 1- x Gd x ) 2 Zr 2 O 7 ceramic powders were synthesised with particle sizes smaller than 1 μm. Subsequently, bulk ceramics were prepared, and the thermophysical properties of the bulk ceramics were determined. The results show that the thermal expansion coefficients of the ceramics changed slightly after 1300 K, and the coefficient values of the ceramics were approximately 11 × 10 −6 K −1 at 1300 K. The thermal conductivities were in the range of 0.95–1.4 W m −1 K −1 from 700 K to 1500 K, which is slightly smaller than that of the ceramic synthesised by the chemical coprecipitation method. These results show that the thermophysical properties of the (Sm 1- x Gd x ) 2 Zr 2 O 7 bulk ceramics synthesised using ceramic powders are satisfactory, further demonstrating that the hydrothermal synthesis process designed in the present study is feasible.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）