ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 52
·2309148
·
IF 19
Yingying Cheng,Bingjie Ma,Peiying Hu,Junxiong Zhang,Dongmei Hu,Jin Wang
Effective thermal superinsulation in extremely high temperatures (EHT) is crucial for aerospace, industrial, and civilization activities. However, current strategies relying on ceramic materials face limitations due to their high thermal conductivity and brittleness in specific conditions. In this study, a feasible and scalable method for synthesizing a flexible, lightweight, and transformable fire-reborn silica-alumina hybrid ceramic aerogel (FR-SACA) is presented, which is achieved by rearranging silica aerogel microparticles and Al 2 O 3 ceramic fibers using a self-sacrifice polymer, resulting in a bio-inspired bird nest structured FR-SACA. The SACA exhibits exceptional properties, including an ultra-low density of 0.01 g cm −3 , a low thermal conductivity of 0.029 W m −1 K −1 , and a reversible compression of up to 80%. Notably, a 20 mm-thick FR-SACA demonstrates a remarkable temperature reduction of 1179.6 °C when exposed directly to a 1300 °C flame, suggesting its potential as a thermal superinsulation material in EHT environments. Furthermore, the transformability of SACA enables in situ fabrication on surfaces with diverse heteromorphic structures, such as flat, bent, and angled shapes, thereby providing thermal superinsulation for various constructions. The Phoenix Nirvana process opens up new possibilities for synthesizing ceramic aerogels with desirable flexibility and adaptive properties, facilitating effective thermal management under extreme conditions.
研究领域:
材料科学
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航空航天工程
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jun Wang,Qianqian Jin,Jianbo Song,Di Zhang,Bin Xu,Zhiyi Ren,Meng Wang,Shixiao Yan,Xiaoliang Sun,Chi Liu,Xiaoyu Chong,Jing Feng
The foremost objective of this work is to employ an entropy strategy to optimize the thermophysical properties of rare-earth (RE) tantalates . The stabilizing single-phase structure of seven-component rare-earth tantalates is verified by density functional theory calculations, and entropy-stabilized (7RE 1/7 )TaO 4 with a defective structure is successfully synthesized via spark plasma sintering . (7RE 1/7 )TaO 4 exhibits lower intrinsic thermal conductivity over the entire temperature range from 100 to 1200 °C. Furthermore, its intrinsic thermal conductivity (0.83–0.90 W m −1 ·K −1 ) is 39–51% and 68–71% lower compared to those of single-RE RETaO 4 and 8YSZ at 1200 °C, respectively, and is even close to the limited thermal conductivity from the Cahill model. This is the result of multiscale phonon scattering by Umklapp phonon-phonon, point defect , dislocation, ferroelastic domain and distorted structures. Moreover, (7RE 1/7 )TaO 4 exhibits superior high-temperature phase stability and excellent mechanical properties . Therefore, entropy-stabilized (7RE 1/7 )TaO 4 compounds with ultralow thermal conductivity can be used as promising thermal insulating 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 THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yali Yu,Peng Zhang,Xuefei Zhang,Dan Wang,Xiangyang Liu,Wei Pan,Chunlei Wan
The hierarchical porous microsphere is a promising feedstock for thermal barrier coatings (TBCs), due to its excellent flowability, high compression strength, and high temperature structure stability. This study aims to determine the formation mechanism of the coating deposited using hierarchical porous microspheres. For the (Sm 0.2 Gd0 .2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Zr 2 O 7 hierarchical microsphere sintered at 1000 ºC to 1550 ºC, the thermal conductivity increased from 0.21 to 0.64 W/m·K, the compression strength increased from 13 MPa to 80 MPa. The hierarchical porous structure can inhibit the heat flow from the surface to interior, resulting in the low melting degree in the plasma jet. Additionally, the coatings exhibit the characteristics of nanostructured coatings and hierarchical porous zones inherited from the microspheres, as evidenced by a comparison of compression strength and impact strength during deposition. The as-sprayed nanostructured coating shows a significantly lower initial thermal conductivity of 0.33 W/m·K at 1000 ºC compared to the conventional coating.
研究领域:
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Yuchen Liu,Dechang Jia,Yu Zhou,Yanchun Zhou,Juanli Zhao,Hongqiang Nian,Bin Liu
A non-equimolar multicomponent perovskite of Zn 0.1 Ca 0.1 Sr 0.4 Ba 0.4 ZrO 3 is successfully synthesized. Its single-phase stabilization is achieved by the designed non-equimolar composition that contributes to the nearly zero mixing enthalpy, the high configuration entropy and the moderate atomic difference. Its chemical bonds inhomogeneity is revealed, which contributes to the unique mechanical and thermal properties of Zn 0.1 Ca 0.1 Sr 0.4 Ba 0.4 ZrO 3 . Its Young’s modulus is 185.7 GPa and tends to be the average of its components’. The thermal conductivity of Zn 0.1 Ca 0.1 Sr 0.4 Ba 0.4 ZrO 3 ranges from 1.45 to 1.87 W/(m·K), being lower than those of its components (CaZrO 3 and BaZrO 3 ) and the typical low thermal conductivity material Y 2 O 3 partially stabilized ZrO 2 . The low thermal conductivities suggest its potential as thermal barrier materials and this work is supposed to arouse future works on the non-equimolar multicomponent ceramics with targeted performances.
研究领域:
材料科学
·
热物理
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Jingxiao Liu,Dayi Yang,Fei Shi,Xiaoying Song,Guohao Cui,Huijun Sun,Chaofan Chen,Ziwei Tian,Meiyu Wang
In order to obtain high-performance energy-saving window material, Pt-Cs x WO 3 /SiO 2 composite aerogels were prepared by in-situ solvothermal synthesis and ambient pressure drying method. The relationship among the near-infrared shielding ability, thermal conductivity , thermal insulation performance and microstructure of Pt-Cs x WO 3 /SiO 2 composite aerogel was investigated. The as-prepared composite aerogel after heat-treatment at 450 °C exhibits low thermal conductivity (0.1090 W/(m·k)) of SiO 2 aerogel and near-infrared shielding ability at the same time due to its high pore volume (0.537–0.796 cm 3 /g), specific surface area (113.968–141.284 m 2 /g) and W 5+ content. The near-infrared shielding rate at 1500 nm of the composite aerogel could attain to 84% when the visible light transmittance is 72%. As Pt-Cs x WO 3 /SiO 2 composite aerogel has the synergistic effect of near-infrared shielding and low thermal conductivity, the composite aerogel heat-treated at 450 °C has excellent visible light transparency and thermal insulation performance. This research provides a new idea for developing high efficient energy-saving window glasses.
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
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 10
·1654-1670
·
IF 11.534
Wu Jinyu,Ma Xiaohui,Hu Xiaoxia,Yan Liwen,Hou Feng,Liu Jiachen,Guo Anran
As a type of titanate, the pseudobrookite (MTi 2 O 5 /M 2 TiO 5 ) exhibits a low thermal expansion coefficient and thermal conductivity, as well as excellent dielectric and solar spectrum absorption properties. However, the pseudobrookite is unstable and prone to decomposing below 1200 °C, which limits the practical application of the pseudobrookite. In this paper, the high-entropy pseudobrookite ceramic is synthesized for the first time. The pure high-entropy (Mg,Co,Ni,Zn)Ti 2 O 5 with the pseudobrookite structure and the biphasic high-entropy ceramic composed of the high-entropy pseudobrookite (Cr,Mn,Fe,Al,Ga) 2 TiO 5 and the high-entropy spinel (Cr,Mn,Fe,Al,Ga,Ti) 3 O 4 are successfully prepared by the in-situ solid-phase reaction method. The comparison between the theoretical crystal structure of the pseudobrookite and the aberration-corrected scanning transmission electron microscopy (AC-STEM) images of high-entropy (Mg,Co,Ni,Zn)Ti 2 O 5 shows that the metal ions (M and Ti ions) are disorderly distributed at the A site and the B site in high-entropy (Mg,Co,Ni,Zn)Ti 2 O 5 , leading to an unprecedentedly high configurational entropy of high-entropy (Mg,Co,Ni,Zn)Ti 2 O 5 . The bulk high-entropy (Mg,Co,Ni,Zn)Ti 2 O 5 ceramics exhibit a low thermal expansion coefficient of 6.35×10 −6 K −1 in the temperature range of 25–1400 °C and thermal conductivity of 1.840 W·m −1 ·K −1 at room temperature, as well as the excellent thermal stability at 200, 600, and 1400 °C. Owing to these outstanding properties, high-entropy (Mg,Co,Ni,Zn)Ti 2 O 5 is expected to be the promising candidate for high-temperature thermal insulation. This work has further extended the family of different crystal structures of high-entropy ceramics reported to date.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 22
·9941-9951
·
IF 3.5
Zeng Dawei,Zhou Jiaxin,Wu Zhen,Sun Luchao,Wang Jingyang
Ultra-high temperature ceramics (UHTCs) are considered as promising thermal insulation materials applied in ultra-high temperature environments (> 2000 °C). However, the high thermal conductivity and high density limit their further development and application. Herein we adopt the strategies of introducing porous structure and high-entropy effect to solve the above problems. Thus porous high-entropy (Zr 0.25 Hf 0.25 Nb 0.25 Ti 0.25 )C ceramics were prepared. In order to obtain the uniform pore structure and high mechanical property, the camphene-based freeze-casting method was used in this study. The as-prepared porous samples exhibit high porosity of 92.01–73.57% and homogeneously interconnected pore structure with average pore size of 40.8–19.6 μm. Besides, this work realizes the aims of lightweight (0.65–2.15 g/cm 3 ) and low thermal conductivity (0.29–1.53 W/(m·K)). More importantly, porous samples still have the merit of high compressive strength (0.38–29.02 MPa) due to the even microstructure. The results show that highly porous high-entropy (Zr 0.25 Hf 0.25 Nb 0.25 Ti 0.25 )C with good overall properties can be an excellent candidate material for ultra-high temperature thermal insulation.
研究领域:
材料科学
·
陶瓷
·
热工学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Xiaoshan Zhang,Bing Wang,Nan Wu,Cheng Han,Chunzhi Wu,Yingde Wang
Ceramic nanofibers with excellent thermal stability and low thermal conductivity are highly desired for high-temperature thermal insulation applications. However, the incompatibility of thermal stability and low thermal conductivity at high-temperatures largely limit the practical use of conventional single-phase ceramic nanofibers . Here, we report the preparation of multi-phase SiZrOC nanofiber membranes (NFMs) composed of amorphous SiOC and ZrO 2 nanocrystals via electrospinning technique. The fabricated SiZrOC NFMs exhibited excellent high-temperature stability (∼1200 °C in Ar) and low thermal conductivity (∼0.1392 W m −1 K −1 at 1000 °C in N 2 ). The decreased thermal conductivity is achieved through a synergistic mechanism, that the multi-phase interfaces and the ZrO 2 nanocrystals create thermal transfer barriers to reduce the heat transfer, whilst the SiOC phase effectively suppresses radiative heat transfer. This unique combination of amorphous SiOC and ZrO 2 nanocrystals provides a novel strategy to prepare high-performance thermal insulation materials, and the obtained SiZrOC NFMs are promising high-temperature thermal insulation materials.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Baojie Zhang,Zongwei Tong,Huijun Yu,Hui Xu,Zhiwei Chen,Xiaolei Li,Huiming Ji
Silicon carbide (SiC) fibers have excellent high temperature resistance and chemical stability in extreme environment. However, the practical application of SiC fibers have been limited by their high intrinsic thermal conductivity . Herein, the novel ZrO 2 /SiC-based nanofiber membranes with high temperature resistance and low thermal conductivity were prepared for the first time using simple blending method via electrospinning technique combined with subsequent curing and pyrolysis. The microstructure, composition, high temperature resistance and thermal insulation mechanisms were analyzed in detail. The results showed that the introduction of Zr could significantly improve the high temperature resistance of the nanofibers up to 1400 °C, at the same time, the multi-phase microstructure (SiOxCy, ZrO 2 , β-SiC and residual carbon) endows it with ultralow thermal conductivity at high temperature (0.217 W m -1 K -1 at 1300 °C). Compared with the reported thermal insulation materials, this work not only prepares thermal insulation materials with higher temperature resistance, but also provides a new perspective for the research of SiC-based nanofibers in the field of thermal insulation.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 16
·7775-7783
·
IF 11.301
Lvye Dou,Xiaota Cheng,Xinxin Zhang,Yang Si,Jianyong Yu,Bin Ding
Industrial thermal energy management or space exploration requires thermal insulating materials with features of low thermal conductivity, low bulk density and robust mechanical properties. However, the use of traditional organic insulation materials is hampered by their poor fire resistance while inorganic insulation ones are either stiff or display a high thermal conductivity. Herein, we design and synthesize binary-network structured silica nanofibrous aerogels (BSAs) by in situ assembly of nanoporous silica aerogels on a cellular structured silica fibrous framework. The resulting BSAs can completely recover from 80% compressive strain, displaying temperature-invariant superelasticity and robust fatigue-resistance up to 100 000 compression-release cycles. Moreover, the unique binary-network structure provides BSAs with ultralow thermal conductivity (21.96 mW m−1 K−1), robust fire retardancy, and superior high-temperature thermal insulation performance. BSAs with a thickness of 20 mm are shown to protect bare hands placed on the opposite side, when directly exposed to butane blowtorch flame (∼1000 °C). These superior performances lead to their appealing practical application potential in energy management, thermal isolation or fire protection fields.
研究领域:
材料科学
·
能源管理
·
热绝缘材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 7
·118107
·
IF 6.2
Huimin Xiang,Jie Fan,Siyuan Huang,Yiran Li,Yuchen Liu,Wenxian Li,Yanchun Zhou,Bin Liu
Porous ceramics with ultralow thermal conductivity and robust thermal stability are critical for advanced hypersonic vehicles. However, sintering and phase transitions of these materials have been critical problems. To address these issues, herein, we report the synthesis of multicomponent (Zn 0.1 Ca 0.1 Sr 0.4 Ba 0.4 )ZrO 3 powders via solid-phase reaction and subsequent fabrication of sintering-resistant porous ceramics using a particle-stabilized foaming approach. By modulating solid loading (20–40 wt%), we achieved tailorable architectures with porosity levels of 81.6–92.3 % and compressive strengths of 0.97–4.50 MPa. The optimized material demonstrates ultralow room-temperature thermal conductivity (0.086–0.150 W/(m·K)), remarkably preserved at 0.232 W/(m·K) at 1000°C. Crucially, these ceramics exhibit exceptional thermomechanical stability with < 1 % linear shrinkage after 6 h heating at 1700°C and survive 200°C-quenching thermal shocks without catastrophic structural failure. These combined properties position (Zn 0.1 Ca 0.1 Sr 0.4 Ba 0.4 )ZrO 3 porous ceramics as a promising candidate for ultrahigh-temperature insulation in aerospace and energy systems.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Yongqian Shi,Yanjun Zhu,Shan Liu,Libi Fu,Juntian Chen,Jiawen Liu,Longcheng Tang,Jiefeng Gao,Pingan Song
There is a significant increase in the demand for lightweight and compressible electromagnetic interference (EMI) shielding materials in various fields. Though MXene aerogels hold immense potential as EMI shielding materials, several shortcomings including poor water resistance, low mechanical robustness, easy oxidation, and high cost limits of their wide application. This work reported a novel strategy involving the co-assembly of MXene and cellulose nanofibers (CNF) through directional freezing and freeze-drying, followed by the capsulation-concreting of a thin layer of flame-retardant polydimethylsiloxane (PDMS) onto the aerogel, to multi-hierarchically construct a series of high-performance CNF/MXene/PDMS composite aerogels. The lightweight CNF/MXene/PDMS/MPP-Zr@PDA composite aerogel achieved ultrahigh EMI shielding effectiveness of 96.8 dB (X-band) and utilization efficiency of 1713.27 dB g g −1 . Furthermore, the PDMS coating effectively imparted excellent compressibility and durability to the 3D scaffold, resulting in a compressive strength of 17.01 kPa for the composite aerogel, representing 199.5% increase compared to CNF aerogel. Additionally, the composite aerogel exhibited outstanding flame-retardant properties (54.6% reduction in heat release rate), ultralow thermal conductivity of 0.0530 W m −1 K −1 and excellent hydrophobicity. Therefore, the durable and flame-retardant CNF/MXene/PDMS composite aerogels hold promising applications in EMI protection, thermal management, smart fire detection, and other specific fields.
研究领域:
材料科学
·
化学工程
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）