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Numerical and Experimental Investigation on Photothermal Performance of Polyimide/High-Electrical-Performance-coating Composite Films Considering Surface Roughness

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Journal of Thermal Science 2022年第4期31卷 1206-1219页

作者： JING Peng ZHOU Xiao XU Zhengyang XU Zhiguo School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Sunman(Zhenjiang)Co. LtdZhenjiang 212000China

Polyimide(PI)films are the common and important components on spacecraft for thermal control.Their parameter design accuracy has an important impact on the spacecraft thermal balance but there are few studies focusing on the effect of film surface defects.In the present study,photothermal properties of composite films made of PI films and germanium/indium tin oxide/aluminum coatings are obtained by UV-VIS-NIR spectrophotometer.The film surface morphology of composite films is obtained by the atomic force microscope.The present study creatively introduces surface roughness into modeling from the perspective of finite-difference time-domain(FDTD)model.The FDTD method considering surface roughness is used to present a comprehensive investigation on the coating effect on the photothermal properties including transmittance and reflectance of composite films.Based on the random rough surface generated by root-mean-square(RMS)roughness and correlation length,the FDTD method is applied to characterize the electromagnetic field of composite films.It has been found that the numerical accuracy is greatly improved and the numerical results agree well with the experimental data when surface roughness is considered.The results also show that coating material and thickness have remarkable impacts on photothermal properties of the composite films.

关键词： FDTD composite film surface roughness photothermal property coating material

Performance of the Cement Matrix Composite material With Rubber Powder

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Journal of Wuhan University of Technology(materials Science) 2004年第1期19卷 77-80页

作者：宋少民 Beijing Institute of Civil Engineering and Architecture

The effect of the deferent rubber content substituted for fine aggregate on the mortar performance was studied.The effects of the rubber coated with the coating materials on the mortar compressive strength,bending strength and impact work were discussed.The optimum rubber powder content and the suitable coating material were found.Through the electrical probe test-BEI,SEI and calcium ion distribution,and the slight crack and the interface between the rubber and cement matrix are analyzed.The results show that the rubber powder coated with the surface treatment materials A,B and C has the capability of absorbing a large amount of energy under the compressive and flexural load and the slight cracks of R-C were controlled and restrained.

关键词： rubber powder cement matrix composite material toughness coating material

Preparation and Properties of Smart Thermal Control and Radiation Protection materials for Multi-functional Structure of Small Spacecraft

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Journal of materials Science & Technology 2011年第10期27卷 879-884页

作者： shijie Zhang Xibin Cao Yingqiang Luan Xinxin Ma Xiaohui Lin Xianren Kong Research Center of Satellite Technology Harbin Institute of Technology Harbin 150080 China The Second System Design of the Second Research Academy of CASIC Beijing 100854 China

Considering the unique properties of small spacecraft, such as light weight, low power-consumption and high heat flux density, a new kind of lightweight boron carbide （B4C） radiation-protection coating material was proposed. New techniques for preparing LSMO thermal control coating and B4C radiation-protection coating were developed. The sample piece of multi-functional structure was manufactured by using the proposed materials, and a series of performance tests, such as thermal control and radiation-protection behaviors were evaluated. Test results show that： the emissivity of the multi-functional structure varies from 0.42 to 0.86 at 240 K to 353 K and the phase transition temperature is about 260 K. The electron radiation-protection ability of the multi-functional structure is 3.3 times better than that of Al material. The performance index of this multi-functional structure can meet the requirements for space application in on-board electronic equipment.

关键词： coating material Phase transition temperature Temperature-dependent emissivity-variable Radiation-protection Spacecraft

Towards mass applications: A review on the challenges and developments in metallic bipolar plates for PEMFC

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Progress in Natural Science:materials International 2020年第6期30卷 815-824页

作者： Zhutian Xu Diankai Qiu Peiyun Yi Linfa Peng Xinmin Lai State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University

The industrial applications of proton exchange membrane fuel cell(PEMFC) technology have attracted tremendous capitals and research attention in the last ten years. However, there are still many bottlenecking problems before the progress triumphs. Among them, a core challenge is the improvement of bipolar plates(BPs).As a key component of PEMFC, the BPs undertake the crucial functions of distributing reactant gases and cooling medium, collecting the electricity generated, exporting waste products, etc. Due to the unique advantages of ultra-thin, high strength, easy-to-mass-produce, etc., metallic BPs have been considered as the promising solution for the automotive and aerospace application scenarios with a strong requirement of power density. However,many challenges remain to be conquered in metallic BPs to fully meet all the requirements in those industrial applications such as corrosion, toxic ion emission and fabrication. The aim of this work is to provide an overview of the important researches in recent years dealing with the most critical problems of metallic BPs before industrial applications. The future studying directions in material and processing methods development are also given towards the wide application of metallic BP PEMFCs.

关键词： Metallic bipolar plate Proton exchange membrane fuel cell Base material coating material Processing method Mass application

Glass formation in Fe-Cr-Zr-B-Mo alloys by tuning Nb addition

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China Foundry 2021年第5期18卷 450-456页

作者： Cong-ran Fu Wei Zhang Qing-chun Xiang Ying-dong Qu Ying-lei Ren Bo Yu Ke-qiang Qiu School of materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Shenyang Research Institute of Foundry Co.Ltd. Shenyang 110022China

Fe-based bulk metallic glasses(BMGs)with high boron content have potential application as a coating material used in the framework for storing spent nuclear fuels to support their safe long-term disposal.The high glass forming ability(GFA)and large supercooled liquid region are therefore required for such Fe-based BMGs in either the glassy powder fabrication or the subsequent coating spraying.In order to meet these requirements,the influence of Nb content on the GFA of Fe_(57)Cr_(10)Zr_(8)B_(18)Mo_(7-x)Nb_(x)(x=1-5,at.%)alloys was investigated,as Nb has positive roles in GFA and thermal stability of BMGs.The results indicate that a fully amorphous phase in the as-cast samples with 3 mm in diameter is obtained for both the Fe_(57)Cr_(10)Zr_(8)B_(18)Mo_(5)Nb_(2) and Fe_(57)Cr_(10)Zr_(8)B_(18)Mo_(4)Nb_(3) alloys.The corresponding supercooled liquid regions of the two BMGs are 78 K and 71 K,respectively.The mechanism for improving their GFA was analyzed based on the principle of metal solidification,the parameters for glass formation and thermal properties of the alloys.The compression strength and Vicker’s hardness of the two BMGs are 1,950 MPa and 1,310 HV,2,062 MPa and 1,180 HV,respectively.The developed BMGs with high B content,good GFA,and very high hardness can be used as coating materials to the framework for spent nuclear fuels.

关键词： amorphous microstructure Nb glass-forming ability coating material

Preparation of microencapsulatedα-olefin drag reducing polymer used in oil pipeline transportation

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Petroleum Science 2011年第1期8卷 99-107页

作者： Li Bing Xing Wenguo Dong Guilin Chen Xiangjun Zhou Ningning Qin Zhanbo Zhang Changqiao School of Chemistry and Chemical Engineering Shandong UniversityShandong 250061China Linyi Institute of Product Quality Supervision and Inspection Shandong 276004China Shandong Institute of Metrology Shandong 250014China Shandong Quality Certification Centre Shandong 250014China

Microcapsules containing oil drag-reducing polymer particles were prepared by melting-scattering and condensing of polyethylene wax,in-situ polymerization of urea and formaldehyde,and interfacial polymerization of styrene respectively.The related processes were studied by a molecular dynamics simulation method,and molecular design of microcapsule isolation agent was carried out on the basis of the simulation.The technologies for preparing microencapsulated oil drag-reducing polymer particles were compared and the circulation drag reducing efficiency of the microencapsulated polymer particles was evaluated based on the characterization results and their dissolution properties.Molecular design of a microcapsule isolation agent suggests that a-olefin polymer particles can be stably dispersed in water by using long-chain alkyl sodium salt surfactant which can prevent the agglomeration ofα-olefin polymer particles.The results of simulation of the adsorption process shows that the amount of alkyl sodium salt surfactant can directly affect the stability of microencapsulatedα-olefin polymer particles, and there must be a minimum critical amount of it.After characterization of the morphology by Scanning Electron Microscopy（SEM） and comparison of the static pressure stability,especially the conditions of reaction and technological control of microcapsules with different shell materials,microencapsulation of a-olefin polymer particles with poly-（urea-formaldehyde） as shell material was selected as the optimum scheme,because it can react under mild conditions and its technological process can be controlled in a large range.The relationship of drag reducing rate and dissolving time of microcapsules showed that the formation of microcapsules did not affect the maximum drag reducing rate,and the drag reducing rate of each sample can reach about 35%along with the dissolving time,i.***.microencapsulation did not affect the drag reducing property ofα-olefin polymer.

关键词： α-olefin polymer molecular design coating material microcapsule preparation stability and solubility drag reducing property

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葫芦脲固相微萃取技术的研究

葫芦脲固相微萃取技术的研究

二次离子质谱法分析聚变裂变混合堆材料表面涂层成份

大环化学和超分子化学的新发展——当前学科交叉的一个重要...

作者：江玉玲齐美玲傅若农北京理工大学理学院化学系

＜正＞本文以葫芦脲[6]（CB[6]）作为涂层材料制备固相微萃取萃取头,并在优化萃取条件下将该萃取头用于白豆蔻中的挥发性成分的提取和GC分析测定。CB[6]萃取头对白豆蔻的提取结果与常规水蒸气蒸馏法具有较好的一致性,并且具有良好的重... 详细信息

＜正＞本文以葫芦脲[6]（CB[6]）作为涂层材料制备固相微萃取萃取头,并在优化萃取条件下将该萃取头用于白豆蔻中的挥发性成分的提取和GC分析测定。CB[6]萃取头对白豆蔻的提取结果与常规水蒸气蒸馏法具有较好的一致性,并且具有良好的重复性和热稳定性。CB[6]作为一种新型固相微萃取涂层材料,具有较好的提取效率和热稳定性,本研究为目前有限的固相微萃取涂层种类提供了一种新的选择。

关键词： cucurbituril solid-phase microextraction coating material

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二次离子质谱法分析聚变裂变混合堆材料表面涂层成份