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Predicted interfacial thermal conductance and thermal conductivity of diamond/Al composites with various interfacial coatings 被引量:9
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作者 LIANG Xuebing JIA Chengchang +1 位作者 CHU Ke CHEN Hui 《Rare Metals》 SCIE EI CAS CSCD 2011年第5期544-549,共6页
The interfacial thermal conductance (ITC) and thermal conductivity (TC) of diamond/Al composites with various coatings were theoretically studied and discussed. A series of predictions and numerical analyses were ... The interfacial thermal conductance (ITC) and thermal conductivity (TC) of diamond/Al composites with various coatings were theoretically studied and discussed. A series of predictions and numerical analyses were performed to investigate the effect of thickness, sound velocity, and other parameters of coating layers on the ITC and TC. It is found that both the ITC and TC decline with increasing coating thickness, especially for the coatings with relatively low thermal conductivity. Nevertheless, if the coating thickness is close to zero, or quite a small value, the ITC and TC are mainly determined by the constants of the coating material. Under this condition, coatings such as Ni, TiC, Mo 2 C, SiC, and Si can significantly improve the ITC and TC of diamond/Al composites. By contrast, coatings like Ag will exert the negative effect. Taking the optimization of interfacial bonding into account, conductive carbides such as TiC or Mo 2 C with low thickness can be the most suitable coatings for diamond/Al composites. 展开更多
关键词 metallic matrix composites COATINGS diamonds thermal conductivity interfacial thermal conductance
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Effect of chromium interlayer thickness on interfacial thermal conductance across copper/diamond interface 被引量:2
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作者 Xiaoyan Liu Fangyuan Sun +8 位作者 Wei Wang Jie Zhao Luhua Wang Zhanxun Che Guangzhu Bai Xitao Wang Jinguo Wang Moon JKim Hailong Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第11期2020-2031,共12页
The thermal conductivity of diamond particles reinforced copper matrix composite as an attractive thermal management material is significantly lowered by the non-wetting heterointerface.The paper investigates the heat... The thermal conductivity of diamond particles reinforced copper matrix composite as an attractive thermal management material is significantly lowered by the non-wetting heterointerface.The paper investigates the heat transport behavior between a 200-nm Cu layer and a single-crystalline diamond substrate inserted by a chromium(Cr)interlayer having a series of thicknesses from 150 nm down to 5 nm.The purpose is to detect the impact of the modifying interlayer thickness on the interfacial thermal conductance(h)between Cu and diamond.The time-domain thermoreflectance measurements suggest that the introduction of Cr interlayer dramatically improves the h between Cu and diamond owing to the enhanced interfacial adhesion and bridged dissimilar phonon states between Cu and diamond.The h value exhibits a decreasing trend as the Cr interlayer becomes thicker because of the increase in thermal resistance of Cr interlayer.The high h values are observed for the Cr interlayer thicknesses below 21 nm since phononic transport channel dominates the thermal conduction in the ultrathin Cr layer.The findings provide a way to tune the thermal conduction across the metal/nonmetal heterogeneous interface,which plays a pivotal role in designing materials and devices for thermal management applications. 展开更多
关键词 SPUTTERING DIAMOND metal/nonmetal interface interfacial thermal conductance time-domain thermoreflectance
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Impact of thermostat on interfacial thermal conductance prediction from non-equilibrium molecular dynamics simulations 被引量:1
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作者 Song Hu C Y Zhao Xiaokun Gu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第5期561-568,共8页
The knowledge of interfacial thermal conductance(ITC)is key to understand thermal transport in nanostructures.The non-equilibrium molecular dynamics(NEMD)simulation is a useful tool to calculate the ITC.In this study,... The knowledge of interfacial thermal conductance(ITC)is key to understand thermal transport in nanostructures.The non-equilibrium molecular dynamics(NEMD)simulation is a useful tool to calculate the ITC.In this study,we investigate the impact of thermostat on the prediction of the ITC.The Langevin thermostat is found to result in larger ITC than the Nose-Hoover thermostat.In addition,the results from NEMD simulations with the Nose-Hoover thermostat exhibit strong size effect of thermal reservoirs.Detailed spectral heat flux decomposition and modal temperature calculation reveal that the acoustic phonons in hot and cold thermal reservoirs are of smaller temperature difference than optical phonons when using the Nose-Hoover thermostat,while phonons in the Langevin thermostat are of identical temperatures.Such a nonequilibrium state of phonons in the case of the Nose-Hoover thermostat reduces the heat flux of low-to-middle-frequency phonons.We also discuss how enlarging the reservoirs or adding an epitaxial rough wall to the reservoirs affects the predicted ITC,and find that these attempts could help to thermalize the phonons,but still underestimate the heat flux from low-frequency phonons. 展开更多
关键词 interfacial thermal conductance phonon transport molecular dynamics
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Strain effects on the interfacial thermal conductance of graphene/h-BN heterostructure
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作者 Feng Liu YouKun Gong +7 位作者 Rui Zou Huiming Ning Ning Hu Yaolu Liu Liangke Wu Fuhao Mo Shaoyun Fu Cheng Yan 《Nano Materials Science》 EI CAS CSCD 2022年第3期227-234,共8页
Previous experimental and computational results have confirmed that the thermal conductivity of a twodimensional(2D) material can be considerably affected by strain. Numerous attention has been paid to explore the rel... Previous experimental and computational results have confirmed that the thermal conductivity of a twodimensional(2D) material can be considerably affected by strain. Numerous attention has been paid to explore the relevant mechanisms. However, the strain effects on the interfacial thermal conductance(ITC) of 2D heterostructure have attracted little attention. Herein, the non-equilibrium molecular dynamics(NEMD) simulations were conducted to the graphene/hexagonal boron nitride(GR/h-BN) heterostructure to investigate the strain effects on the ITC. Three types of strains were considered, i.e., tensile strain, compressive strain, and shear strain.The results indicate that the strain can adjust the ITC for the GR/h-BN heterostructure effectively, and the strain loading direction also influences the ITC. Generally, the tensile strain reduces the ITC of the heterostructure, in addition to the BN-C system at small tensile strain;both the compressive strain and shear strain increase the ITC,especially at a small strain. For the NB-C system, it is more sensitive to the strain loading direction and the yx shear strain of 0.06 is the most effective way to strengthen the ITC. Our results also show that the out-of-plane deformation weakens the in-plane vibration of atoms, leading to a reduction of the interfacial thermal energy transport. 展开更多
关键词 GRAPHENE H-BN HETEROSTRUCTURE Strain engineering interfacial thermal conductance NEMD
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Harnessing wrinkling morphologies of graphene on soft substrates for mechanically programmable interfacial thermal conductance
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作者 Qingchang Liu Baoxing Xu 《Nano Research》 SCIE EI CSCD 2023年第7期9608-9617,共10页
Strain engineering has been leveraged to tune the thermal properties of materials by introducing stress and manipulating local atomic vibrations,which poses a detrimental threat to the mechanical integrity of material... Strain engineering has been leveraged to tune the thermal properties of materials by introducing stress and manipulating local atomic vibrations,which poses a detrimental threat to the mechanical integrity of materials and structures and limits the capability to regulate thermal transport.Here,we report that the interfacial thermal conductance of graphene on a soft substrate can be regulated by harnessing wrinkling and folding morphologies of graphene,which could be well controlled by managing the prestrain applied to the substrate.These obtained graphene structures are free of significant in-plane mechanical strain and only have infinitesimal distortion to the intrinsic thermal properties of graphene.The subsequent thermal transport studies with pumpprobe non-equilibrium molecular dynamics(MD)simulation show that the thermal conductance between graphene structures and the substrate is uniquely determined by the morphological features of graphene.The atomic density of interfacial interactions,energy dissipation,and temperature distribution are elucidated to understand the thermal transport across each graphene structure and substrate.We further demonstrate that the normalized thermal conductance decreases monotonically with the increase of the equivalent mechanical strain,showing the capability of mechanically programmable interfacial thermal conductance in a broad range of strains.Application demonstrations in search of on-demand thermal conductance are conducted by controlling the geometric morphologies of graphene.This study lays a foundation for regulating interfacial thermal conductance through mechanical loading-induced geometric deformation of materials on a soft substrate,potentially useful in the design of flexible and stretchable structures and devices with tunable thermal management performance. 展开更多
关键词 interfacial thermal conductance wrinkled graphene PUMP-PROBE atomic interaction mechanical loading
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Solid-gas interface thermal conductance for the thermal barrier coating with surface roughness:The confinement effect 被引量:1
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作者 Xue Zhao Jin-Wu Jiang 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第12期418-423,共6页
The yttria-stabilized zirconia(YSZ)is a famous thermal barrier coating material to protect hot-end components of an engine.As a characteristic feature of the YSZ,the surface roughness shall play an important role in t... The yttria-stabilized zirconia(YSZ)is a famous thermal barrier coating material to protect hot-end components of an engine.As a characteristic feature of the YSZ,the surface roughness shall play an important role in the interface thermal conductance between the YSZ and gas,considering that the gas is typically at an extremely high temperature.We investigate the effect of the surface roughness on the thermal conductance of the YSZ-gas interface with surface roughness described by nanoscale pores on the surface of the YSZ.We reveal two competitive mechanisms related to the microstructure of the pore,i.e.,the actual contact area effect and the confinement effect.The increase of the pore depth will enlarge the actual contact area between the YSZ and gas,leading to enhancement of the solid-gas interface thermal conductance.In contrast to the positive actual contact area effect,the geometry-induced confinement effect greatly reduces the interface thermal conductance.These findings shall offer some fundamental understandings for the microscopic mechanisms of the YSZ-gas interface thermal conductance. 展开更多
关键词 interface thermal conductance thermal barrier coating solid-gas interface confinement effect
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Thermal conductance in a two-slit quantum waveguide
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作者 Nie Liu-Ying Li Chun-Xian +2 位作者 Zhou Xiao-Ping Wang Cheng-Zhi Cheng Fang 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第2期413-418,共6页
Using the scattering-matrix method, we investigate the thermal conductance in a two-slit quantum waveguide at low temperature. The results show that the total thermal conductance decreases monotonically with temperatu... Using the scattering-matrix method, we investigate the thermal conductance in a two-slit quantum waveguide at low temperature. The results show that the total thermal conductance decreases monotonically with temperature increasing. Moreover, we find that the behaviours of the thermal conductance versus temperature are different for different types of slits. 展开更多
关键词 acoustic phonon transport thermal conductance quantum wire
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Thermal Conductance of Cu and Carbon Nanotube Interface Enhanced by a Graphene Layer
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作者 黄正兴 王立莹 +1 位作者 白素媛 唐祯安 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第8期120-122,共3页
Thermal conduetances between Cu and graphene covered carbon nanotubes (gCNTs) are calculated by molecular dynamics simulations. The results show that the thermal conductance is about ten times larger than that of Cu... Thermal conduetances between Cu and graphene covered carbon nanotubes (gCNTs) are calculated by molecular dynamics simulations. The results show that the thermal conductance is about ten times larger than that of Cu- CNT interface. The enhanced thermal conductance is due to the larger contact area introduced by the graphene layer and the stronger thermal transfer ability of the Cu-gCNT interface. From the linear increasing thermal conductance with the increasing total contact area, an effective contact area of such an interface can be defined. 展开更多
关键词 thermal conductance of Cu and Carbon Nanotube Interface Enhanced by a Graphene Layer CU
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Simulations of thermal conductance across tilt grain boundaries in graphene
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作者 Peng Wang Bo Gong +1 位作者 Qiong Feng Hong-Tao Wang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第6期1528-1531,共4页
Non-equilibrium molecular dynamics (MD) method was performed to simulate the thermal transporta- tion process in graphene nanoribbons (GNRs). A convenient way was conceived to introduce tilt grain boundaries (GBs... Non-equilibrium molecular dynamics (MD) method was performed to simulate the thermal transporta- tion process in graphene nanoribbons (GNRs). A convenient way was conceived to introduce tilt grain boundaries (GBs) into the graphene lattice by repetitive removing C atom rows along certain directions. Comprehensive MD simulations reveal that larger-angle GBs are effective thermal barriers and substantially reduce the average thermal conductivity of GNRs. The GB thermal conductivity is ~ 10 W-m-1 .K-l for a bicrystal GNR with a misorientation of 21.8%, which is -97 % less than that of a prefect GNR with the same size. The total thermal resistance has a monotonic dependence on the den- sity of the 5-7 defects along the GBs. A theoretical model is proposed to capture this relation and resolve the contribu- tions by both the reduction in the phonon mean free path and the defect-induced thermal resistance. 展开更多
关键词 GRAPHENE thermal conductivity Grain bound-ary
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Crossover to Quantized Thermal Conductance in Nanotubes and Nanowires
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作者 Kohei Yamamoto Hiroyuki Ishii +1 位作者 Nobuhiko Kobayashi Kenji Hirose 《Open Journal of Composite Materials》 2013年第2期48-54,共7页
Using the non-equilibrium Green’s function techniques with interatomic potentials, we study the temperature dependence and the crossover of thermal conductance from the usual behavior proportional to the cross-sectio... Using the non-equilibrium Green’s function techniques with interatomic potentials, we study the temperature dependence and the crossover of thermal conductance from the usual behavior proportional to the cross-sectional area at room temperature to the universal quantized behavior at low temperature for carbon nanotubes, silicon nanowires, and diamond nanowires. We find that this crossover of thermal conductance occurs smoothly for the quasi-one-dimensional materials and its universal behavior is well reproduced by the simplified model characterized by two parameters. 展开更多
关键词 Carbon NANOTUBE Nanowire thermal Transport Quantum conductance NON-EQUILIBRIUM Green’s Function
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Thermal conduction of one-dimensional carbon nanomaterials and nanoarchitectures 被引量:1
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作者 Haifei Zhan Yuantong Gu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第3期94-103,共10页
This review summarizes the current studies of the thermal transport properties of one-dimensional(1D)carbon nano-materials and nanoarchitectures.Considering different hybridization states of carbon,emphases are laid o... This review summarizes the current studies of the thermal transport properties of one-dimensional(1D)carbon nano-materials and nanoarchitectures.Considering different hybridization states of carbon,emphases are laid on a variety of 1D carbon nanomaterials,such as diamond nanothreads,penta-graphene nanotubes,supernanotnbes,and carbyne.Based on experimental measurements and simulation/calculation results,we discuss the dependence of the thermal conductivity of these 1D carbon nanomaterials on a wide range of factors,including the size effect,temperature influence,strain effect,and others.This review provides an overall understanding of the thermal transport properties of 1D carbon nanomaterials and nanoarchitectures,which paves the way for effective thermal management at nanoscale. 展开更多
关键词 diamond nanothread carbon nanotube thermal conductivity molecular dynamics simulations
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Effect of Nanomaterials Addition to Phase Change Materials on Heat Transfer in Solar Panels under Iraqi Atmospheric Conditions
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作者 Majid Ahmed Mohammed Abdullah Talab Derea +2 位作者 Mohammed Yaseen Lafta Obed Majeed Ali Omar Rafae Alomar 《Frontiers in Heat and Mass Transfer》 EI 2023年第1期215-226,共12页
It is common knowledge that phase-change materials are used for the purpose of thermal storage because of the characteristics that are exclusive to these materials and not found in others.These characteristics include... It is common knowledge that phase-change materials are used for the purpose of thermal storage because of the characteristics that are exclusive to these materials and not found in others.These characteristics include a large capacity for absorbing heat and a large capacity for releasing heat when the phase changes;however,these materials have a low thermal conductivity.This paper presents the results of an experimental study that investigated the impact that nanoparticles of copper oxide had on reducing the temperature of solar panels.The phase change substance that was used was determined to be beeswax.The impact of adding nanoscale copper oxide at a concentration of 0.05%of the total mass of wax was investigated and compared to a reference solar panel that did not contain any nanoscale additions.The findings demonstrated that the incorporation of nanoscale copper oxide brought about a reduction of three℃ in the plate’s average temperature as well as a one percent improvement in its electrical efficiency.In cases where it seems that the use of nanoparticles might potentially enhance the performance of integrated solar energy systems that contain phase change. 展开更多
关键词 Copper oxide nanoparticles NANOPARTICLE BEESWAX thermal conductivity phase-change materials
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Thermal conductivity of carbon-based nanomaterials:Deep understanding of the structural effects 被引量:3
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作者 Yangsu Xie Xinwei Wang 《Green Carbon》 2023年第1期47-57,共11页
The thermal conductivity of carbon-based nanomaterials(e.g.carbon nanotubes,graphene,graphene aerogels,and carbon fibers)is a physical property of great scientific and engineering importance.Thermal conductivity tailo... The thermal conductivity of carbon-based nanomaterials(e.g.carbon nanotubes,graphene,graphene aerogels,and carbon fibers)is a physical property of great scientific and engineering importance.Thermal conductivity tailoring via structure engineering is widely conducted to meet the requirement of different applications.Traditionally,the thermal conductivity-temperature relation is used to analyze the structural effect but this relation is extremely affected by effect of temperature-dependence of specific heat.In this paper,detailed review and discussions are provided on the thermal reffusivity theory to analyze the structural effects on thermal conductivity.For the first time,the thermal reffusivity-temperature trend in fact uncovers very strong structural degrading with reduced temperature for various carbon-based nanomaterials.The residual thermal reffusivity at the 0 K limit can be used to directly calculate the structure thermal domain(STD)size,a size like that determined by x-ray diffraction,but reflects phonon scattering.For amorphous carbon materials or nanomaterials that could not induce sufficient x-ray scattering,the STD size probably provides the only available physical domain size for structure analysis.Different from many isotropic and anisotropic materials,carbon-based materials(e.g.graphite,graphene,and graphene paper)have Van der Waals bonds in the c-axis direction and covalent bonds in the a-axis direction.This results in two different kinds of phonons whose specific heat,phonon velocity,and mean free path are completely different.A physical model is proposed to introduce the anisotropic specific heat and temperature concept,and to interpret the extremely long phonon mean free path despite the very low thermal conductivity in the c-axis direction.This model also can be applied to other similar anisotropic materials that feature Van der Waals and covalent bonds in different directions. 展开更多
关键词 thermal conductivity thermal reffusivity Structure thermal domain size Carbon-based nanomaterials Phonons and electrons Structure scattering Anisotropic temperatures Anisotropic specific heat
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Deterioration of equivalent thermal conductivity of granite subjected to heating-cooling treatment 被引量:1
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作者 Mohua Bu Peng Zhang +3 位作者 Pingye Guo Jiamin Wang Zhaolong Luan Xin Jin 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第10期4229-4246,共18页
Understanding the thermal conductivity of granite is critical for many geological and deep engineering applications.The heated granite was subjected to air-,water-,and liquid nitrogen(LN2-)coolings in this context.The... Understanding the thermal conductivity of granite is critical for many geological and deep engineering applications.The heated granite was subjected to air-,water-,and liquid nitrogen(LN2-)coolings in this context.The transient hot-wire technique was used to determine the equivalent thermal conductivity(ETC)of the granite before and after treatment.The deterioration mechanism of ETC is analyzed from the meso-perspective.Finally,the numerical model is used to quantitatively study the impact of cooling rate on the microcrack propagation and heat conduction characteristics of granite.The results show that the ETC of granite is not only related to the heating temperature,but also affected by the cooling rate.The ETC of granite decreases nonlinearly with increasing heating temperature.A faster cooling rate causes a greater decrease in ETC at the same heating temperature.The higher the heating temperature,the stronger the influence of cooling rate on ETC.The main explanation for the decrease in ETC of granite is the increase in porosity and microcrack density produced by the formation and propagation of pore structure and microcracks during heating and cooling.Further analysis displays that the damage of granite at the heating stage is induced by the difference in thermal expansion and elastic properties of mineral particles.At the cooling stage,the faster cooling rate causes a higher temperature gradient,which in turn produces greater thermal stress.As a result,it not only causes new cracks in the granite,but also aggravates the damage at the heating stage,which induces a further decrease in the heat conduction performance of granite,and this scenario is more obvious at higher temperatures. 展开更多
关键词 Equivalent thermal conductivity(ETC) GRANITE Heating-cooling treatment Pore structure MICROCRACK Grain-based model
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Prediction of the thermal conductivity of Mg–Al–La alloys by CALPHAD method 被引量:1
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作者 Hongxia Li Wenjun Xu +5 位作者 Yufei Zhang Shenglan Yang Lijun Zhang Bin Liu Qun Luo Qian Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CSCD 2024年第1期129-137,共9页
Mg-Al alloys have excellent strength and ductility but relatively low thermal conductivity due to Al addition.The accurate prediction of thermal conductivity is a prerequisite for designing Mg-Al alloys with high ther... Mg-Al alloys have excellent strength and ductility but relatively low thermal conductivity due to Al addition.The accurate prediction of thermal conductivity is a prerequisite for designing Mg-Al alloys with high thermal conductivity.Thus,databases for predicting temperature-and composition-dependent thermal conductivities must be established.In this study,Mg-Al-La alloys with different contents of Al2La,Al3La,and Al11La3phases and solid solubility of Al in the α-Mg phase were designed.The influence of the second phase(s) and Al solid solubility on thermal conductivity was investigated.Experimental results revealed a second phase transformation from Al_(2)La to Al_(3)La and further to Al_(11)La_(3)with the increasing Al content at a constant La amount.The degree of the negative effect of the second phase(s) on thermal diffusivity followed the sequence of Al2La>Al3La>Al_(11)La_(3).Compared with the second phase,an increase in the solid solubility of Al in α-Mg remarkably reduced the thermal conductivity.On the basis of the experimental data,a database of the reciprocal thermal diffusivity of the Mg-Al-La system was established by calculation of the phase diagram (CALPHAD)method.With a standard error of±1.2 W/(m·K),the predicted results were in good agreement with the experimental data.The established database can be used to design Mg-Al alloys with high thermal conductivity and provide valuable guidance for expanding their application prospects. 展开更多
关键词 magnesium alloy thermal conductivity thermodynamic calculations materials computation
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Flexible and Robust Functionalized Boron Nitride/Poly(p‑Phenylene Benzobisoxazole)Nanocomposite Paper with High Thermal Conductivity and Outstanding Electrical Insulation 被引量:1
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作者 Lin Tang Kunpeng Ruan +3 位作者 Xi Liu Yusheng Tang Yali Zhang Junwei Gu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第2期423-437,共15页
With the rapid development of 5G information technology,thermal conductivity/dissipation problems of highly integrated electronic devices and electrical equipment are becoming prominent.In this work,“high-temperature... With the rapid development of 5G information technology,thermal conductivity/dissipation problems of highly integrated electronic devices and electrical equipment are becoming prominent.In this work,“high-temperature solid-phase&diazonium salt decomposition”method is carried out to prepare benzidine-functionalized boron nitride(m-BN).Subsequently,m-BN/poly(pphenylene benzobisoxazole)nanofiber(PNF)nanocomposite paper with nacremimetic layered structures is prepared via sol–gel film transformation approach.The obtained m-BN/PNF nanocomposite paper with 50 wt%m-BN presents excellent thermal conductivity,incredible electrical insulation,outstanding mechanical properties and thermal stability,due to the construction of extensive hydrogen bonds andπ–πinteractions between m-BN and PNF,and stable nacre-mimetic layered structures.Itsλ∥andλ_(⊥)are 9.68 and 0.84 W m^(-1)K^(-1),and the volume resistivity and breakdown strength are as high as 2.3×10^(15)Ωcm and 324.2 kV mm^(-1),respectively.Besides,it also presents extremely high tensile strength of 193.6 MPa and thermal decomposition temperature of 640°C,showing a broad application prospect in high-end thermal management fields such as electronic devices and electrical equipment. 展开更多
关键词 Poly(p-phenylene-2 6-benzobisoxazole)nanofiber Boron nitride thermal conductivity Electrical insulation
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Porous high-entropy rare-earth phosphate(REPO_(4),RE=La,Sm,Eu,Ce,Pr and Gd)ceramics with excellent thermal insulation performance via pore structure tailoring 被引量:1
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作者 Peixiong Zhang Enhui Wang +3 位作者 Jingjing Liu Tao Yang Hailong Wang Xinmei Hou 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第7期1651-1658,共8页
Thermal insulation materials play an increasingly important role in protecting mechanical parts functioning at high temperatures.In this study,a new porous high-entropy(La_(1/6)Ce_(1/6)Pr_(1/6)Sm_(1/6)Eu_(1/6)Gd_(1/6)... Thermal insulation materials play an increasingly important role in protecting mechanical parts functioning at high temperatures.In this study,a new porous high-entropy(La_(1/6)Ce_(1/6)Pr_(1/6)Sm_(1/6)Eu_(1/6)Gd_(1/6))PO_(4)(HE(6RE_(1/6))PO_(4))ceramics was prepared by combining the high-entropy method with the pore-forming agent method and the effect of different starch contents(0–60vol%)on this ceramic properties was systematically investigated.The results show that the porous HE(6RE_(1/6))PO_(4)ceramics with 60vol%starch exhibit the lowest thermal conductivity of 0.061 W·m^(-1)·K^(-1)at room temperature and good pore structure stability with a linear shrinkage of approximately1.67%.Moreover,the effect of large regular spherical pores(>10μm)on its thermal insulation performance was discussed,and an optimal thermal conductivity prediction model was screened.The superior properties of the prepared porous HE(6RE_(1/6))PO_(4)ceramics allow them to be promising insulation materials in the future. 展开更多
关键词 porous high-entropy(La_(1/6)Ce_(1/6)Pr_(1/6)Sm_(1/6)Eu_(1/6)Gd_(1/6))PO_(4) ceramics high-entropy strategy pore-forming agent method thermal insulation material thermal conductivity
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Thermal conductivity of hydrate and effective thermal conductivity of hydrate-bearing sediment
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作者 Cunning Wang Xingxun Li +2 位作者 Qingping Li Guangjin Chen Changyu Sun 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第9期176-188,共13页
The research on the thermal property of the hydrate has recently made great progress,including the understanding of hydrate thermal conductivity and effective thermal conductivity(ETC)of hydratebearing sediment.The th... The research on the thermal property of the hydrate has recently made great progress,including the understanding of hydrate thermal conductivity and effective thermal conductivity(ETC)of hydratebearing sediment.The thermal conductivity of hydrate is of great significance for the hydrate-related field,such as the natural gas hydrate exploitation and prevention of the hydrate plugging in oil or gas pipelines.In order to obtain a comprehensive understanding of the research progress of the hydrate thermal conductivity and the ETC of hydrate-bearing sediment,the literature on the studies of the thermal conductivity of hydrate and the ETC of hydrate-bearing sediment were summarized and reviewed in this study.Firstly,experimental studies of the reported measured values and the temperature dependence of the thermal conductivity of hydrate were discussed and reviewed.Secondly,the studies of the experimental measurements of the ETC of hydrate-bearing sediment and the effects of temperature,porosity,hydrate saturation,water saturation,thermal conductivity of porous medium,phase change,and other factors on the ETC of hydrate-bearing sediment were discussed and reviewed.Thirdly,the research progress of modeling on the ETC of the hydrate-bearing sediment was reviewed.The thermal conductivity determines the heat transfer capacity of the hydrate reservoir and directly affects the hydrate exploitation efficiency.Future efforts need to be devoted to obtain experimental data of the ETC of hydrate reservoirs and establish models to accurately predict the ETC of hydrate-bearing sediment. 展开更多
关键词 HYDRATE thermal conductivity Hydrate-bearing sediment Preparation method Effective thermal conductivity MODEL
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Improvement strategy on thermophysical properties of A_(2)B_(2)O_(7)-type rare earth zirconates for thermal barrier coatings applications:A review
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作者 Zijian Peng Yuhao Wang +8 位作者 Shuqi Wang Junteng Yao Qingyuan Zhao Enyu Xie Guoliang Chen Zhigang Wang Zhanguo Liu Yaming Wang Jiahu Ouyang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第5期1147-1165,共19页
The A_(2)B_(2)O_(7)-type rare earth zirconate compounds have been considered as promising candidates for thermal barrier coating(TBC) materials because of their low sintering rate,improved phase stability,and reduced ... The A_(2)B_(2)O_(7)-type rare earth zirconate compounds have been considered as promising candidates for thermal barrier coating(TBC) materials because of their low sintering rate,improved phase stability,and reduced thermal conductivity in contrast with the currently used yttria-partially stabilized zirconia (YSZ) in high operating temperature environments.This review summarizes the recent progress on rare earth zirconates for TBCs that insulate high-temperature gas from hot-section components in gas turbines.Based on the first principles,molecular dynamics,and new data-driven calculation approaches,doping and high-entropy strategies have now been adopted in advanced TBC materials design.In this paper,the solid-state heat transfer mechanism of TBCs is explained from two aspects,including heat conduction over the full operating temperature range and thermal radiation at medium and high temperature.This paper also provides new insights into design considerations of adaptive TBC materials,and the challenges and potential breakthroughs are further highlighted for extreme environmental applications.Strategies for improving thermophysical performance are proposed in two approaches:defect engineering and material compositing. 展开更多
关键词 rare earth zirconates thermal barrier coatings defect engineering doping and compositing thermal conductivity thermal expansion
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Advances in Liquid Crystal Epoxy:Molecular Structures,Thermal Conductivity,and Promising Applications in Thermal Management
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作者 Wenying Zhou Yun Wang +6 位作者 Fanrong Kong Weiwei Peng Yandong Wang Mengxue Yuan Xiaopeng Han Xiangrong Liu Bo Li 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第4期315-343,共29页
Traditional heat conductive epoxy composites often fall short in meeting the escalating heat dissipation demands of large-power,high-frequency,and highvoltage insulating packaging applications,due to the challenge of ... Traditional heat conductive epoxy composites often fall short in meeting the escalating heat dissipation demands of large-power,high-frequency,and highvoltage insulating packaging applications,due to the challenge of achieving high thermal conductivity(k),desirable dielectric performance,and robust thermomechanical properties simultaneously.Liquid crystal epoxy(LCE)emerges as a unique epoxy,exhibiting inherently high k achieved through the self-assembly of mesogenic units into ordered structures.This characteristic enables liquid crystal epoxy to retain all the beneficial physical properties of pristine epoxy,while demonstrating a prominently enhanced k.As such,liquid crystal epoxy materials represent a promising solution for thermal management,with potential to tackle the critical issues and technical bottlenecks impeding the increasing miniaturization of microelectronic devices and electrical equipment.This article provides a comprehensive review on recent advances in liquid crystal epoxy,emphasizing the correlation between liquid crystal epoxy’s microscopic arrangement,organized mesoscopic domain,k,and relevant physical properties.The impacts of LC units and curing agents on the development of ordered structure are discussed,alongside the consequent effects on the k,dielectric,thermal,and other properties.External processing factors such as temperature and pressure and their influence on the formation and organization of structured domains are also evaluated.Finally,potential applications that could benefit from the emergence of liquid crystal epoxy are reviewed. 展开更多
关键词 intrinsically thermal conductive epoxy liquid crystal unit ordered structure phonon transport thermal conductivity
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