JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
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IF 2.999
Biao Zhang,Feng Ye,Shichao Liu,Haoqian Zhang,Qiang Liu,Ye Gao,Jie Ma
In this study, we developed a new route to fabricate polymer/ceramic composites. This method mainly involves tape casting and vacuum assist infiltration (called TC-VI). Composites, using Bisphenol-A cyanate ester resin (BADCy) as matrix and mixed dielectric ceramic powders (1− x ) Ni 0.5 Ti 0.5 NbO 4 + x ZnNb 2 O 6 ( x = 0–100 vol. %) as fillers, were prepared successfully by this route. Dielectric properties and thermal conductivity of the composites were tested. Furthermore, the migration of silver (Ag) electrodes in the composites was investigated. Results show that the composites exhibit excellent dielectric properties. Dielectric constant of the composites can be adjusted continuously from 13.49 to 22.46 (at 9045 MHz). Dielectric loss is lower than 3.68 × 10 −3 (at 7320 MHz). The addition of ceramic fillers can significantly enhance the thermal conductivity of BADCy resin. Moreover, no obvious Ag element migration can be detected in the composites. Due to the good performances of the composites, this method could be widely used in the fabrication of multilayer devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 11
·8108-8119
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IF 2.993
Yan Fei,Liu Liu,Li Ming,Zhang Mengjie,Xiao Linghan,Ao Yuhui
A facile electrophoretic deposition method was proposed to deposit copper (Cu) and carbon nanotubes (CNTs) on the surface of carbon fiber (CF) to improve the thermal conductivity and interfacial properties of carbon fiber-reinforced polymer (CFRP) composites. Surface morphologies, crystallographic properties, thermal conductivity, interlaminar shear strength (ILSS) and element distribution of the composites were characterized by scanning electron microscopy (SEM), X-ray diffraction, thermal constant analysis, short-beam bending tests and SEM energy-dispersive X-ray diffractometer (SEM–EDX), respectively. The results indicate that the presence of Cu and CNTs generated networks and bridges with each other, which produced continuous heat conduction pathways and significantly enhanced both the specific surface area and roughness of the fiber surface. These pathways obviously promoted an improvement in the thermal and interfacial properties. The thermal conductivity and ILSS of the CNTs–Cu–CF/epoxy composites increased by 292 and 39.5%, respectively, compared with CF/epoxy composites. Therefore, this method is anticipated to be utilized in the future fabrication of multifunctional CFRP composites.
研究领域:
材料科学
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2014
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IF 2.624
Yuan-Xiang Fu,Zhuo-Xian He,Dong-Chuan Mo,Shu-Shen Lu
Heat dissipation is an important issue for electronic devices. In the present work, we prepared eight kinds of thermal adhesives by filling the epoxy resin with natural graphite, copper, aluminum , zinc oxide , boron nitride , aluminum oxide, diamond and silver powders, and measured the thermal conductivity of all samples. The results show the eight fillers can efficiently improve the thermal conductivity of the epoxy resin. Meanwhile, we found the layer-shape filler is more favorable than the ball-shape filler and the sharp-corner-shape filler to enhance the thermal conductivity of epoxy resin, and the low price layer-shape natural graphite-epoxy adhesive had the highest thermal conductivity up to 1.68 W m −1 K −1 at weight 44.3% of the eight thermal adhesives. All the fillers and the cross sections of thermal adhesives morphologies images were characterized by scanning electron microscopy, and the thermal conductivities of all the samples were measured by Hot Disk TPS-2500 thermal constants analyzer.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Liang Wang,Wei-Ming Guo,Peng-Fei Sheng,Li-Fu Lin,Xiao Zong,Shang-Hua Wu
A new type of non-oxide sintering additive of YH 2 was introduced for the fabrication of AlN ceramics with high thermal conductivity and flexural strength . The effects of YH 2 addition (0–5 wt%) on the phase composition, densification, microstructure, thermal conductivity and flexural strength of pressureless sintered AlN ceramics were investigated and compared with those Y 2 O 3 -added samples (1–5 wt%). The addition of 1 wt% YH 2 led to an in-situ reduction reaction with oxygen impurities, the formation of Y 2 O 3 and finally the formation of yttrium aluminate, which in turn improved densification and microstructure. A high flexural strength (408.69 ± 28.23 MPa) was achieved. The addition of 3 wt% YH 2 increased the average grain size and purified the lattice. All these effects are believed to help achieve a high thermal conductivity of 184.82 ± 1.75 W·m −1 ·K −1 . Although the thermal conductivity was close to the value of 3 wt% Y 2 O 3 -added sample, its strength was much increased to 381.53 ± 43.41 MPa. Meanwhile, it demonstrated a good combination of the thermal conductivity and flexural strength than the values reported in some literature. However, further increasing the YH 2 addition to 5 wt% resulted in a high N/O ratio that inhibited the densification behavior of AlN ceramics. The current study showed that AlN ceramics with excellent thermal and mechanical properties could be obtained by the introduction of a suitable YH 2 additive.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hong Cao,Yuan Li,Weidi Xu,Jie Yang,Zhengying Liu,Lu Bai,Wei Yang,Mingbo Yang
Phase change materials (PCMs) as one of the most potential latent heat storage techniques have been widely used for thermal management and energy storage. However, simultaneously imparting flexibility, high thermal conductivity, and considerable energy storage density to organic PCMs remains challenging. In this work, a coupling strategy combining substance exchange and magnetic orientation has been proposed to fabricate phase change gels (PCGs) with thermally induced flexibility and high through-plane thermal conductivity. In the PCGs, synthesized boron nitride/ferroferric oxide (BN@Fe3O4) particles and polyacrylic acid (PAA) precursor liquid are introduced to polyethylene glycol (PEG) aqueous solution, and a magnetic field is applied in the process of PAA network construction to promote ordered arrangement of BN@Fe3O4 along the direction of the magnetic field. Consequently, PEG is wrapped by the cross-linked PAA supporting network, forming PCGs with excellent shape stability and thermally induced flexibility. The vertical orientation structure of BN@Fe3O4 endows the PCGs with an enhanced through-plane thermal conductivity of up to 1.07 W m–1 K–1 at a BN@Fe3O4 loading of 25.6 wt % with an additional enhancement of 215% compared to the composite without BN. The thermally conductive leakage-proof PCGs present great application potential in heat storage and management.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Hongxia Liu,Shun Zhang,Yan Zhang,Shuotong Zong,Wang Li,Can Zhu,Feng Luo,Jian Wang,Zhigang Sun
SnSe is a promising medium-temperature thermoelectric material due to its extremely low thermal conductivity and tunable electronic transport properties. In this work, n-type SnSe0.95 polycrystals doped with CeCl3 are synthesized by a melting method combined with a spark plasma sintering (SPS) process. The samples have highly textured structures and anisotropic thermoelectric properties. CeCl3 doping has a favorable effect on the electronic transport above 473 K, which may benefit from the excitation of the introduced impurity energy level. Moreover, the thermal conductivity is significantly reduced due to the phonon scattering by point defects. Finally, a peak ZT value of 1.17 is obtained at 773 K in SnSe0.95–0.5 mol % CeCl3, which paves the way for improving the thermoelectric performance of n-type SnSe via rare-earth halide doping.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Rui Chen,Qinpan Qiu,Xiao Peng,Chao Tang
Natural ester is regarded as a potential alternative to mineral insulating oil and has a wide range of applications in power system , but its electrical properties and thermal conductivity still need to be improved. Nano modification technology can improve the performance of natural ester to ensure the stability and reliability of natural ester in power equipment. In this study, nano modified natural ester is prepared with APTES surface modified h-BN, and the mechanism of enhancing the properties of natural ester is explored from the microscopic perspective by molecular simulation. The experimental results showed that nano h-BN had good dispersion stability in natural ester after surface modification with APTES. The electrical properties and thermal conductivity of the nano modified natural ester have been greatly improved, and the relative optimal doping concentration of nanoparticles is 0.03 g/L. The simulation results show that the interfacial thickness between nanoparticles and natural ester is larger and more tightly bound after surface modification, which is beneficial to reduce thermal resistance and improve thermal conductivity of natural ester insulating oil. The traps at the interface between nanoparticles and natural ester can capture free electrons in the oil, thus improving the breakdown voltage of natural ester insulating oil.
研究领域:
材料科学
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电力工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Jiguang Huang,Haiping Chen,Jihao Yang,Ziwei Du,Heng Zhang,Zhaohao Li
Transport membrane condenser can efficiently recover water and heat from wet flue gas . Ceramic membrane is the heat and mass transfer medium in the process. However, the relationship between membrane property and the recovery performance is only partially reported based on current research state. This work focuses on the effects of permeability, material, and ceramic particle size of membrane on the water and heat recovery. Membranes were prepared from three different sizes of coal fly ash and an alumina powder. Water and heat recovery performances of the membranes are experimentally compared. Results indicate that increasing membrane permeability improves water and heat recovery because the resistance of heat and mass transfer is reduced. The alumina membrane performs 3–10% more water recovery than the coal fly ash-based membrane while thermal conductivity of the alumina membrane was 11.5 times that of the coal fly ash-based membrane. Increasing ceramic particle size shows two opposite effects on the water and heat recovery, promotion because of the permeability rising, and undermine because of the thermal conductivity reduction. Low-cost membranes with high permeability and high thermal conductivity are recommended in transport membrane condenser application.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Junlin Chen,Zijie Mo,Yuanzhou Chen,Pingjing Mo,Ziyue Hu,Xiang Chen,Jian Yu,Zhifeng Hao,Xiaoliang Zeng,Rong Sun,Jianbin Xu
To improve the solar energy storage efficiency and thermal conductivity, we developed stable 3D-Ti3C2Tx framework-supported composites as phase change materials (FCPCMs) fabricated by the spatial confining forced network assembly (SCFNA) method. The 3D-Ti3C2Tx framework was constructed by decomposition of a compressed mixture of NH4HCO3 and Ti3C2Tx nanosheets. The controllable porous structure of the 3D-Ti3C2Tx framework and hydrogen bonds between -OH groups (or -F groups) on the surface of MXene and the long chain of PEG benefited the good impregnation of PEG into the framework with good compatibility. Therefore, the developed PCM composites exhibited satisfactory phase change enthalpy in the range of 93.36–119.11 J/g. Compared with PEG8000, the thermal conductivity of the composite with loading 40 wt % of 3D-Ti3C2Tx increased from 0.166 to 1.733 W/(m·K). The improvement of the thermal conductivity is mainly derived from the thermal conduction path provided by the stable 3D-Ti3C2Tx framework. Based on the spatial confining forced network assembly, FCPCMs presented good shape stabilization and thermal reliability in 200 melting–freezing cycles. Benefiting from the construction of the 3D-Ti3C2Tx thermal conductivity path, the fast temperature increase rate under light irradiation is the highlight of FCPCMs. It is noted that FCPCMs exhibit both good photothermal conversion and energy storage efficiency, with the photothermal conversion and storage performance η as high as 95%. Consequently, the developed PCM composites in this work exhibited tremendous application potential in the solar energy utilization field.
研究领域:
材料科学
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能源工程
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2023
·
IF 5.2
Wenjie Sun,Tong Xiao,Qingyi Liu,Jiateng Zhao,Changhui Liu
Glycerol is a bio-based low-cost chemical, which has been widely studied in the field of heat conduction because of its wide working temperature range and superior thermopysical. However, high viscosity of glycerol is a prominent problem that limit the application of glycerol. In this work, low viscosity and high thermal conductivity of glycerol nanofluids are prepared under the dual role of nanoparticles, in which nanoparticles work as the nanoadditives enable an enhancement of thermal conductivity and specific heat capacity of nanofluids and the catalyst make a decline of viscosity of nanofluids. The thermal and viscosity properties of the nanofluid were investigated, and the addition of 15% acetylacetone and 2% TiO 2 increased the thermal conductivity of the nanofluid to 0.3194 W/m·K, which was 8.12% higher than that of the glycerol. Meanwhile, the viscosity was reduced to 357.4 mPa (30 °C) with 15% acetylacetone and 0.5% TiO 2 nanoparticles, which was 47% lower than that of glycerol at the same temperature. Additionally, results of fourier transform infrared spectrometer and proton nuclear magnetic resonance demonstrate that acetal reaction plays an important role in reducing the viscosity of nanofluids, meanwhile, the tests of X-ray diffraction show that nanoparticles can be utilized circularly.
研究领域:
材料科学
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热管理工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Zi-Chen Wang,Xiao-Di Jiang,Yu-Xian Duan,Xu Wang,Zhen-Hua Ge,Jin-Ming Cai,Xiao-Ming Cai,Hong-Lin Tan
Tin selenide exhibits outstanding thermoelectric properties. Among its various forms, multicrystalline SnSe stands out as a more practical choice compared to single-crystal SnSe, owing to its straightforward chemical synthesis process, enhanced processability, and scalability. Herein, we synthesized p-type polycrystalline Sn 1−x Ag X Se bulk materials (x = 0, 0.01, 0.015, 0.02, 0.025, 0.03) using a simple hydrothermal and hot pressing method. Characterization methods such as XRD , Raman and XPS were used to demonstrate the successful doping of Ag + into the SnSe matrix. When the doping concentration reached Sn 0.98 Ag 0.02 Se (x = 0.02), Ag + reached the optimal concentration in the SnSe matrix, causing significant lattice distortion which increased phonon scattering and lowered the thermal conductivity , resulting in Sn 0.98 Ag 0.02 Se achieving ZT max = 1.14. However, when the doping concentration exceeded Sn 0.98 Ag 0.02 Se (x > 0.02), excess silver ions precipitated, partially acting as charge carriers, leading to a significant increase in electrical conductivity , resulting in Sn 0.97 Ag 0.03 Se having an electrical conductivity of 6860 s/m at 773 K. Compared to the pure phase, the electrical conductivity of Sn 0.97 Ag 0.03 Se increased by 259 %, and the ZT value of Sn 0.98 Ag 0.02 Se increased by 178%. This work demonstrates that Ag + is an effective p-type dopant in the SnSe system and indicates that high ZT values in SnSe can be achieved through a simple, low-cost, and environmentally friendly method.
研究领域:
材料科学
·
能源材料
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chenglu Lian,Zhihua Long,Wei Qian,Zhichen Guan,Kun Huo,Yinqun Hua,Jie Cai
Thermal barrier coating materials play a crucial role ensuring the efficient and stable operation of gas turbines. The thermophysical and mechanical properties of GZ 1-x -GT x (x = 0, 0.1, 0.3, 0.5) composite ceramics, as well as the corrosion resistance properties against calcium magnesium aluminum silicate (CMAS) at 1250 °C, were investigated. The results indicated that the overall properties of Gd 2 Zr 2 O 7 -GdTaO 4 composite ceramics significantly improved with an increase in the second phase GdTaO 4 content. Among all the ceramics designed, GZ 0.5 -GT 0.5 exhibited the lowest thermal conductivity (0.920 W m −1 K −1 at 800 °C) and the highest fracture toughness (2.02 MPa m 1/2 ). Additionally, the molten CMAS interacted with the Gd 2 Zr 2 O 7 -GdTaO 4 composite ceramics, forming a dense apatite layer, which positively contributed to inhibiting CMAS infiltration. Considering its excellent thermal, mechanical, and corrosion resistance properties, Gd 2 Zr 2 O 7 -GdTaO 4 composite ceramics are considered a promising 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
危险品化学品经营许可证（带存储）