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Breaking Through Bottlenecks for Thermally Conductive Polymer Composites:A Perspective for Intrinsic Thermal Conductivity,Interfacial Thermal Resistance and Theoretics 被引量:20
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作者 Junwei Gu Kunpeng Ruan 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第7期118-126,共9页
Rapid development of energy,electrical and electronic technologies has put forward higher requirements for the thermal conductivities of polymers and their composites.However,the thermal conductivity coefficient(λ)va... Rapid development of energy,electrical and electronic technologies has put forward higher requirements for the thermal conductivities of polymers and their composites.However,the thermal conductivity coefficient(λ)values of prepared thermally conductive polymer composites are still difficult to achieve expectations,which has become the bottleneck in the fields of thermally conductive polymer composites.Aimed at that,based on the accumulation of the previous research works by related researchers and our research group,this paper proposes three possible directions for breaking through the bottlenecks:(1)preparing and synthesizing intrinsically thermally conductive polymers,(2)reducing the interfacial thermal resistance in thermally conductive polymer composites,and(3)establishing suitable thermal conduction models and studying inner thermal conduction mechanism to guide experimental optimization.Also,the future development trends of the three above-mentioned directions are foreseen,hoping to provide certain basis and guidance for the preparation,researches and development of thermally conductive polymers and their composites. 展开更多
关键词 thermally conductive polymer composites Intrinsic thermal conductivity Interfacial thermal resistance thermal conduction models thermal conduction mechanisms
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Effect of single Si_(1−x)C_(x)coating and compound coatings on the thermal conductivity and corrosion resistance of Mg-3Sn alloy 被引量:2
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作者 Chunming Wang Sufen Xiao +1 位作者 Yungui Chen Xia Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS 2015年第1期10-15,共6页
A single Si_(1−x)C_(x)coating and compound coatings were deposited on Mg-3Sn matrix alloy by magnetron sputtering method.Compound coatings included Mg or Mg/AlTi intermediates between Mg-3Sn substrate and Si_(1−x)C_(x... A single Si_(1−x)C_(x)coating and compound coatings were deposited on Mg-3Sn matrix alloy by magnetron sputtering method.Compound coatings included Mg or Mg/AlTi intermediates between Mg-3Sn substrate and Si_(1−x)C_(x)coating.The thermal conductivity of the Mg-3Sn alloy after coating was enhanced at room temperature.The results showed that the Mg-3Sn alloy coated with Mg/AlTi/Si_(1−x)C_(x)displayed higher thermal conductivity,its thermal conductivity after corrosion was 90.1 W/(m K)and 108.4 W/(m K)at 25℃and 100℃,respectively.Meanwhile,it was revealed that the Mg/Si_(1−x)C_(x)and Mg/AlTi/Si_(1−x)C_(x)compound coatings had nobler Ecorr and much lower i_(corr),higher Rp,compared with the bare Mg-3Sn and Mg-3Sn/Si_(1−x)C_(x)system,and improved the corrosion resistance of the magnesium substrate. 展开更多
关键词 Si_(1−x)C_(x)coating Compound coatings thermal conductivity Corrosion resistance
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Study on the Thermal Fatigue Behavior of Hot Deformed Wear Resistance Cast Iron and Effect of Carbide
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作者 董丽涛 刘荣昌 +1 位作者 李兴元 陈秀宏 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S2期283-286,共4页
The thermal fatigue behavior of wear resistance cast iron with different quantity of deformation has been investigated. The results show that eutectic carbide is the main location and passage for initiation and extens... The thermal fatigue behavior of wear resistance cast iron with different quantity of deformation has been investigated. The results show that eutectic carbide is the main location and passage for initiation and extension of thermal fatigue cracks, approving that the more serious, the carbide breaks. The higher thermal fatigue resistance of wear resistance cast iron will be and thermal fatigue fracture belongs mainly to brittleness. 展开更多
关键词 hot deformed wear resistance cast iron thermal fatigue CARBIDE rare earths
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Microstructure and wear resistance of electro-thermal explosion sprayed stellite coating used for remanufacturing 被引量:1
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作者 金国 徐滨士 +2 位作者 王海斗 李庆芬 魏世丞 《Journal of Central South University》 SCIE EI CAS 2005年第S2期207-210,共4页
Electro-thermal explosion directional spraying was used to prepare the stellite coating on substrate of the AISI 1045 steel. The morphologies of cross-section and worn scar, porosity, distribution of elements, micro- ... Electro-thermal explosion directional spraying was used to prepare the stellite coating on substrate of the AISI 1045 steel. The morphologies of cross-section and worn scar, porosity, distribution of elements, micro- hardness and wear resistance of the coating were determined by means of SEM, EDAX, micro-hardness tester and sliding wear tester. Because of the compact construction, good bonding and high hardness, the coating is characterized by good wear resistance. The results show that the mainly failure mode of the stellite coating is micro- plowing. 展开更多
关键词 STELLITE COATING MICROSTRUCTURE wear resistance electro-thermal explosion directional SPRAYING
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Influence of CeO_2 on the Microstructure and Wear Resistance of M_(80)S_(20) Thermal Spray and Thermal Spray Welding Coatings
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作者 王铀 于宗汉 +2 位作者 刘家浚 王长生 李全安 《Journal of Rare Earths》 SCIE EI CAS CSCD 1992年第3期212-216,共5页
The influence of rare earth oxide CeO_2 on microstructure and wear resistance of M_(80)S_(20) thermal spray and thermal spray welding coatings is studied using optical microscope,scanning electron microscope,X-ray ene... The influence of rare earth oxide CeO_2 on microstructure and wear resistance of M_(80)S_(20) thermal spray and thermal spray welding coatings is studied using optical microscope,scanning electron microscope,X-ray energy dispersion spectroscope,X-ray diffractometer and wear testing machine.The results show that the addi- tion of 8% CeO_2 can improve the microstructure,microhardness and wear resistance of coatings significantly. 展开更多
关键词 CeO_2 thermal spray thermal spray welding MICROSTRUCTURE wear resistance
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Self-Modifying Nanointerface Driving Ultrahigh Bidirectional Thermal Conductivity Boron Nitride-Based Composite Flexible Films 被引量:2
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作者 Taoqing Huang Xinyu Zhang +5 位作者 Tian Wang Honggang Zhang Yongwei Li Hua Bao Min Chen Limin Wu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第1期14-24,共11页
While boron nitride(BN) is widely recognized as the most promising thermally conductive filler for rapidly developing high-power electronic devices due to its excellent thermal conductivity and dielectric properties,a... While boron nitride(BN) is widely recognized as the most promising thermally conductive filler for rapidly developing high-power electronic devices due to its excellent thermal conductivity and dielectric properties,a great challenge is the poor vertical thermal conductivity when embedded in composites owing to the poor interracial interaction causing severe phonon scattering.Here,we report a novel surface modification strategy called the "self-modified nanointerface" using BN nanocrystals(BNNCs) to efficiently link the interface between BN and the polymer matrix.Combining with ice-press assembly method,an only 25 wt% BNembedded composite film can not only possess an in-plane thermal conductivity of 20.3 W m-1K-1but also,more importantly,achieve a through-plane thermal conductivity as high as 21.3 W m-1K-1,which is more than twice the reported maximum due to the ideal phonon spectrum matching between BNNCs and BN fillers,the strong interaction between the self-modified fillers and polymer matrix,as well as ladder-structured BN skeleton.The excellent thermal conductivity has been verified by theoretical calculations and the heat dissipation of a CPU.This study provides an innovative design principle to tailor composite interfaces and opens up a new path to develop high-performance composites. 展开更多
关键词 thermal management materials Boron nitride thermal conductivity Interfacial thermal resistance
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Preparation,Performance and Slag Resistant Mechanism of Low Thermal Conductivity Microporous Corundum
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作者 FU Lyuping HUANG Ao +3 位作者 GU Huazhi ZHANG Meijie LI Zhengkun ZHAO Yi 《China's Refractories》 CAS 2015年第4期23-30,共8页
The microporous corundum material was prepared using alumina micro-powder as the main raw material, alumina sol and starch as binders by a wet process, achieving the bulk density of 3.05 g · cm^-3, the apparent p... The microporous corundum material was prepared using alumina micro-powder as the main raw material, alumina sol and starch as binders by a wet process, achieving the bulk density of 3.05 g · cm^-3, the apparent porosity of 9. 1%, the closed porosity of 12.3%, the median pore diameter of 0. 43 μm, and the thermal conductivity of 6. 5 W· m^-1· K^-1 at 800 ℃ which is 41.6% lower than that of common corundum. The slag resistance of the microporous corundum material was studied by immersion and compared with that of the common corundum aggregate, and the slag resistant mechanism of microporous corundum material was revealed. The results show that the slag resistance of the microporous corundum material is superior to that of the common corundum aggregate, the SEM and EDX show that on the reaction interface between microporous corundum and molten, slag, a continuous isolation layer with a large quantity of CA2 and CA6 columnar crystals is formed; while the common corundum aggregate reacts with the molten slag interface to form a discontinuous isolation layer of columnar crystals, through which a lot of molten slag corrodes or permeates into the aggregate. The mechanism is mainly that the microporous structure is more advantageous to nucleation and growth of CA2 and CA6 columnar crystals; in the reaction with the aggregate, the molten slag gets saturated and the critical solution thickness of the microporous corundum and the common corundum is 0. 16 μm and 0. 34 μm, respectively, this is caused by the smaller microporous corundum aggregate pores; and the smaller pores also increase the second phase ripening rate of microporous corundum, which is 9. 7 times of that of the common corundum. 展开更多
关键词 low thermal conductivity microporous corundum PREPARATION performance slag resistant mechanism
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Modeling of thermal conductivity for disordered carbon nanotube networks
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作者 殷浩 刘治国 杨决宽 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第4期63-67,共5页
Several theoretical models have been developed so far to predict the thermal conductivities of carbon nanotube(CNT)networks.However,these models overestimated the thermal conductivity significantly.In this paper,we cl... Several theoretical models have been developed so far to predict the thermal conductivities of carbon nanotube(CNT)networks.However,these models overestimated the thermal conductivity significantly.In this paper,we claimed that a CNT network can be considered as a contact thermal resistance network.In the contact thermal resistance network,the temperature of an individual CNT is nonuniform and the intrinsic thermal resistance of CNTs can be ignored.Compared with the previous models,the model we proposed agrees well with the experimental results of single-walled CNT networks. 展开更多
关键词 thermal conductivity carbon nanotube networks contact thermal resistance
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Effects of TiCN Composite Die with Low Thermal Conductivity on Hot Forging Performances
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作者 Ryo Matsumoto Tomio Itamochi Shoji Mori 《Journal of Mechanics Engineering and Automation》 2016年第2期59-65,共7页
Titanium carbonitride based composite (TiCN-metallic binder) was developed as die material for replacement of cemented tungsten carbide. The effects of thermal conductivity characteristic of the TiCN composite on ho... Titanium carbonitride based composite (TiCN-metallic binder) was developed as die material for replacement of cemented tungsten carbide. The effects of thermal conductivity characteristic of the TiCN composite on hot forging performances were investigated using a servo press with ram motion control. Three types of the die materials; (a) tool steel for hot working, (b) cemented tungsten carbide with high thermal conductivity and (c) TiCN composite with low thermal conductivity were compared. In hot upsetting of a chrome steel workpiece, the TiCN composite die was confirmed to reduce the forging load by approximately 20% at slow forging speed. This is because the die with low thermal conductivity could prevent the workpiece from rapid cooling induced by heat transfer at the die-workpiece interface. In addition, the material flow of the workpiece to a die cavity was improved. Furthermore, the wear depth/wear coefficient of the TiCN composite was lower than that of the tool steel and the cemented tungsten carbide in the numerical analysis of wear due to the combination of low thermal conductivity and high hardness. 展开更多
关键词 FORGING DIE servo press thermal conductivity material flow wear.
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The Solving of the Inverse Thermal Conductivity Problem for Study the Short Linear Heat Pipes
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作者 Arkady Vladimirovich Seryakov 《Engineering(科研)》 2022年第6期185-216,共32页
The results of studies by solving the inverse thermal conductivity problem of the heat capacity of evaporator of the short linear heat pipes (HP’s) with a Laval nozzle-liked vapour channel and intended for cooling sp... The results of studies by solving the inverse thermal conductivity problem of the heat capacity of evaporator of the short linear heat pipes (HP’s) with a Laval nozzle-liked vapour channel and intended for cooling spacecraft and satellites with strict take-off mass regulation are presented. Mathematical formulation of the inverse problem for the HP’s thermal conductivity in one-dimensional coordinate system is accompanied by the measurement results using the monotonic heating method in a vacuum adiabatic calorimeter the HP’s surface temperatures along the longitudinal axis over the entire temperature load range, thermal resistance, and arrays of thermal power data on the evaporator Q<sub>ev</sub> and vortex flow calorimeter Q<sub>cond</sub> for the condensation surface allow us to estimate the average value of the evaporator heat capacity C<sub>ev</sub> by solving the inverse thermal conductivity problem in the HP’s evaporator region. Since at the beginning of working fluid boiling for a certain time interval, the temperature of the capillary-porous evaporator remains close to constant, and with the continuation of heating and by solving the inverse thermal conductivity problem, it becomes possible to calculate the heat capacity of the working evaporator and the evaporation specific heat of the boiling working fluid and compare it with the table values. 展开更多
关键词 Short Linear HP’s The Inverse Problem of thermal conductivity The Monotonic Heating Method thermal resistance and Heat Capacity
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Effect of carbide formers on microstructure and thermal conductivity of diamond-Cu composites for heat sink materials 被引量:17
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作者 夏扬 宋月清 +2 位作者 林晨光 崔舜 方针正 《中国有色金属学会会刊:英文版》 EI CSCD 2009年第5期1161-1166,共6页
Diamond-copper composites were prepared by powder metallurgy,in which the diamond particles were pre-coated by magnetic sputtering with copper alloy containing a small amount of carbide forming elements(including B,Cr... Diamond-copper composites were prepared by powder metallurgy,in which the diamond particles were pre-coated by magnetic sputtering with copper alloy containing a small amount of carbide forming elements(including B,Cr,Ti,and Si).The influence of the carbide forming element additives on the microstructure and thermal conductivity of diamond composites was investigated.It is found that the composites fabricated with Cu-0.5B coated diamond particles has a relatively higher density and its thermal conductivity approaches 300 W/(m·K).Addition of 0.5%B improves the interfacial bonding and decreases thermal boundary resistance between diamond and Cu,while addition of 1%Cr makes the interfacial layer break away from diamond surface.The actual interfacial thermal conductivity of the composites with Cu-0.5B alloy coated on diamond is much higher than that of the Cu-1Cr layer,which suggests that the intrinsic thermal conductivity of the interfacial layer is an important factor for improving the thermal conductivity of the diamond composites. 展开更多
关键词 铜复合材料 硬质合金 导热系数 钻石 显微结构 散热片 金刚石复合材料 金刚石颗粒
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Effect of Geometry of Filler Particles on the Effective Thermal Conductivity of Two-Phase Systems 被引量:1
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作者 Deepti Chauhan Nilima Singhvi Ramvir Singh 《International Journal of Modern Nonlinear Theory and Application》 2012年第2期40-46,共7页
The present paper deals with the effect of geometry of filler particles on the effective thermal conductivity for polymer composites. In the earlier models, less emphasis has been given on the shape of filler particle... The present paper deals with the effect of geometry of filler particles on the effective thermal conductivity for polymer composites. In the earlier models, less emphasis has been given on the shape of filler particles. In this paper, expressions for effective thermal conductivity has been derived using the law of minimal thermal resistance and equal law of the specific equivalent thermal conductivity for three different shapes i.e. spherical, elliptical and hexagonal of filler particles respectively. Calculated values of effective thermal conductivity for various samples using the derived expressions then compared with experimental data available and other models developed in the literature. The results calculated are in good agreement with the earlier experimental data and the deviation, is least in our expressions showing the success of the model. 展开更多
关键词 Effective thermal conductivity Polymer Composites MINIMAL thermal resistance SHAPE of FILLER
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Exploring Trade-offs in Thermal Interface Materials:The Impact of Polymer-Filler Interfaces on Thermal Conductivity and Thixotropy
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作者 Bin Zhang Zheng-Li Dou +2 位作者 Yong-Zheng Zhang Qiang Fu Kai Wu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第7期916-925,I0006,共11页
Effective thermal transport across solid-solid interfaces which is essential in thermal interface materials(TIMs),necessitates both optimal thixotropy and high thermal conductivity.The role of filler surface modificat... Effective thermal transport across solid-solid interfaces which is essential in thermal interface materials(TIMs),necessitates both optimal thixotropy and high thermal conductivity.The role of filler surface modification,a fundamental aspect of TIM fabrication,in the influence of these properties is not fully understood.This study employs the use of a silane coupling agent(SCA)to modify alumina,integrating experimental approaches with molecular dynamics simulations,to elucidate the interface effects on thixotropy and thermal conductivity in polydimethylsiloxane(PDMS)-based TIMs.Our findings reveal that the variations of SCAs modify both interface binding energy and transition layer thickness.The interface binding energy restricts macromolecular segmental relaxation near the interface,hindering desirable thixotropy and bond line thickness.On the contrary,the thickness of the transition layer at the interface positively influences thermal conductivity,facilitating the transport of phonons between the polymer and filler.Consequently,selecting an optimal SCA allows a balance between traditionally conflicting goals of high thermal conductivity and minimal bond line thickness,achieving an impressively low interface thermal resistance of just 2.45-4.29 K·mm^(2)·W^(-1)at275.8 kPa. 展开更多
关键词 thermal interface material Surface modification thermal conductivity THIXOTROPY Interface thermal resistance
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Measuring the thermal conductivity and interfacial thermal resistance of suspended MoS2 using electron beam self-heating technique 被引量:5
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作者 Adili Aiyiti Xue Bai +2 位作者 Jing Wu Xiangfan Xu Baowen Li 《Science Bulletin》 SCIE EI CSCD 2018年第7期452-458,共7页
Establishment of a new technique or extension of an existing technique for thermal and thermoelectric measurements to a more challenging system is an important task to explore the thermal and thermoelectric properties... Establishment of a new technique or extension of an existing technique for thermal and thermoelectric measurements to a more challenging system is an important task to explore the thermal and thermoelectric properties of various materials and systems. The bottleneck lies in the challenges in measuring the thermal contact resistance. In this work, we applied electron beam self-heating technique to derive the intrinsic thermal conductivity of suspended Molybdenum Disulfide (MoS2) ribbons and the thermal contact resistance, with which the interracial thermal resistance between few-layer MoS2 and Pt electrodes was calculated. The measured room temperature thermal conductivity of MoS2 is around -30 W/(m K), while the estimated interracial thermal resistance is around -2 × 10 -6 m-2 K/W. Our experiments extend a useful branch in application of this technique for studying thermal properties of suspended layered ribbons and have potential application in investigating the interracial thermal resistance of different twodimensional (2D) heterojunctions. 展开更多
关键词 MoS2 thermal conductivity thermal resistance E-Beam self-heating technique
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Improving Wear Resistance of the Ni-base Thermal Spray-Welding Coating Using Rare Earths 被引量:1
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作者 翟光杰 刘家浚 《Journal of Rare Earths》 SCIE EI CAS CSCD 1997年第1期28-33,共6页
By adding rare earth alloy and cerium oxide, the effect of rare earths on tribological properties of nickel base alloy layer was studied to approach the possibility of applying rare earths to Ni base thermal spray ... By adding rare earth alloy and cerium oxide, the effect of rare earths on tribological properties of nickel base alloy layer was studied to approach the possibility of applying rare earths to Ni base thermal spray welding coating. Wear test results showed that the wear rates of the nickel base coating without rare earths were quite high, and the load bearing capacity of coating was low, in contrast, the wear rates of the coating with rare earths were low and the coating had higher load bearing capacity. The results show that rare earths can refine the structure of nickel base alloy, improve the interface of the coating and substrate. 展开更多
关键词 Rare earths wear resistance thermal spray Ni base coating
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Theoretical and experimental study of the thermal conductivity of nanoporous media 被引量:5
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作者 JIANG PeiXue XIANG Heng XU RuiNa 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第8期2140-2147,共8页
The nanoparticle thermal conductivity and nanoscale thermal contact resistance were investigated by molecular dynamics(MD) simulations to further understand nanoscale porous media thermal conductivity.Macroscale porou... The nanoparticle thermal conductivity and nanoscale thermal contact resistance were investigated by molecular dynamics(MD) simulations to further understand nanoscale porous media thermal conductivity.Macroscale porous media thermal conductivity models were then revised for nanoporous media.The effective thermal conductivities of two packed beds with nanoscale nickel particles and a packed bed with microscale nickel particles were then measured using the Hot Disk.The measured results show that the nano/microscale porous media thermal conductivities were much less than the thermal conductivities of the solid particles.Comparison of the measured and calculated results shows that the revised combined parallel-series model and the revised Hsu-Cheng model can accurately predict the effective thermal conductivities of micro-and nanoparticle packed beds. 展开更多
关键词 thermal conductivity NANOPARTICLE nanoporous media molecular dynamics(MD) simulation contact resistance
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Calculation Model of Effective Thermal Conductivity of a Spiral-wound Lithium Ion Battery 被引量:1
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作者 SHI Bo ZHANG Han +1 位作者 QI Yuanjing YANG Lili 《Journal of Thermal Science》 SCIE EI CAS CSCD 2018年第6期572-579,共8页
This paper proposed an analytical model which can calculate the effective thermal conductivity (ETC) of a spiral-wound Lithium-ion battery (Li-ion battery). It bases on a two-dimensional energy balance with both radia... This paper proposed an analytical model which can calculate the effective thermal conductivity (ETC) of a spiral-wound Lithium-ion battery (Li-ion battery). It bases on a two-dimensional energy balance with both radial and spiral heat transfer, as well as internal thermal contact resistance (TCR) considered simultaneously and studies the influence of winding layers and winding tension on the ETC. Results show that the analytical data are in good agreement with the numerical results. With the winding layers decreased and the winding tension enhanced, the ETC of Li-ion battery increases gradually. The radial temperature in Li-ion battery is also investigated which demonstrates a relatively higher temperature when considering the internal TCR. 展开更多
关键词 a spiral-wound Li-ion battery effective thermal conductivity analytical model internal thermal contact resistance winding layers winding tension
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Effect of Hot Deformation on Formation and Growth of Thermal Fatigue Crackin Chromium Wear Resistant Cast Iron 被引量:11
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作者 CHANG Li-min LIU Jian-hua 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2006年第1期36-39,共4页
The formation and growth of thermal fatigue crack in chromium wear resistant cast iron was investigated, and the effect of hot deformation on the crack was analyzed by means of optical microscope and scanning electron... The formation and growth of thermal fatigue crack in chromium wear resistant cast iron was investigated, and the effect of hot deformation on the crack was analyzed by means of optical microscope and scanning electron microscope and high frequency induction thermal fatigue tester. The results show that eutectic carbide is the main location and passage for initiation and extension of thermal fatigue cracks, hot deformation can improve the eutectic carbiders morphology and distribution, inhibit the generation and propagation of thermal fatigue cracks. In the experiment, the propagation rate of thermal fatigue crack reduces with the quantity of hot deformation increasing, which was analyzed in the point view of the activation energy of crack propagation. 展开更多
关键词 hot deformation chromium wear resistant cast iron thermal fatigue crack
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Effect of radial heat conduction on effective thermal conductivity of carbon nanotube bundles 被引量:1
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作者 WANG JianLi SONG YaMei +5 位作者 ZHANG YuFeng HU YuHan YIN Hang GU YunFeng XIA Re CHEN YunFei 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第12期1959-1966,共8页
The effect of the radial heat conduction on the effective thermal conductivity of carbon nanotube(CNT) bundles is studied by the nonequilibrium molecular dynamics(NEMD) method. The hexagonal CNT bundle consists of sev... The effect of the radial heat conduction on the effective thermal conductivity of carbon nanotube(CNT) bundles is studied by the nonequilibrium molecular dynamics(NEMD) method. The hexagonal CNT bundle consists of seven(10, 10) single-walled carbon nanotubes(SWCNTs). The radial heat conduction is induced by creating the vacancy defects in some segments of the constituent CNTs. Combined with the temperature differences and the inter-tube thermal resistances at the different segments,the radial heat flow in the CNT bundle is calculated. The maximum percentage of the radial heat flow is less than 7% with the presence of four defective CNTs, while the resultant decrement of the effective thermal conductivity of the bundle is about 18%.The present results indicate that the radial heat flow can significantly diminish the axial heat conduction in the CNT bundles,which probably explains the smaller effective thermal conductivity in the CNT assemblies compared to that of the individual CNTs. 展开更多
关键词 AXIAL thermal conductivity carbon NANOTUBE BUNDLE inter-tube thermal resistance RADIAL heat flow
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Effect of RE Modification and Heat Treatment on Formation and Growth of Thermal Fatigue Crack in Wear Resistant Cast Iron Containing Low Alloy
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作者 许涛 胡春宝 谢丹阳 《Journal of Rare Earths》 SCIE EI CAS CSCD 2003年第S1期202-205,共4页
The formation and growth of thermal fatigue crack and the function of RE and heat treatment in wear resistance of cast iron containing low alloy were investigated,and it was analyzed in view of the activation energy f... The formation and growth of thermal fatigue crack and the function of RE and heat treatment in wear resistance of cast iron containing low alloy were investigated,and it was analyzed in view of the activation energy for the crack′s propagation. The results show that the thermal fatigue cracks are mainly generated at eutectic carbides,and the cracks are grown by themselves spreading and joining each other. RE can improve the eutectic carbide′s morphology,inhibit the generation and propagation of thermal fatigue cracks,therefore,promote the activation energy for the crack′s propagation,and especially,which is more noticeable in case of the RE modification in combination with heat treatment. 展开更多
关键词 metal materials wear resistance of cast iron containing low alloy thermal fatigue crack rare earths
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