检索结果-南通市图书馆

Heat Dissipation Performance of porous copper with Elongated Cylindrical Pores

在线全文

学校读者我要写书评

暂无评论

引用

Journal of Materials Science & Technology 2014年第9期30卷 934-938页

作者： Hao Du Dongzhu Lu Jianzhong Qi Yanfang Shen Lisong Yin Yuan Wang Zhongguang Zheng Tianying Xiong Division of Surface Engineering of Materials Institute of Metal Research Chinese Academy of Sciences Testing and Analysis Center Wuyi University Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University

The purpose of this paper is to investigate heat dissipation performance of porous copper with long cylindrical pores fabricated by a unidirectional solidification method. Three samples with porosity of 29.87%, 34.47% and 50.98% were chosen and cut into size of 60 mm （length） × 26 mm （width） × 2 mm （thickness） along the vertical direction of pore axis. Their heat dissipation performance was evaluated by a nonsteady method in air and compared to those of not only bulk copper but also bored coppers with porosity of 30.61% and 32.20%. It is found that the porous copper dissipated heat faster by a forced air convection than that by natural convection from 80 ℃ to room temperature and both porosity and pore size play an important role in the performance for the porous copper. Furthermore, the heat dissipation rate is higher when the forced air was circulated along the specimens than that perpendicular to the specimens for the porous copper. It is revealed that porous copper with bigger porosity and a proper pore size possesses a higher heat dissipation rate. It is concluded that the porous copper with elongated cylindrical pores has larger heat dissipation performance than both the bulk copper and the bored copper, which is attributed to its higher specific surface area. Application of the porous copper for heat dissipation is promising.

关键词： porous copper Heat dissipation Porosity Pore size

Study on Micron porous copper Prepared by Physical Vacuum Dealloying

在线全文

学校读者我要写书评

暂无评论

引用

Acta Metallurgica Sinica(English Letters) 2016年第12期29卷 1144-1147页

作者： Yi-Bin Ren Yu-Xia Sun Ke Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China Shenyang Aerospace University Shenyang 110136 China

porous copper was prepared successfully by physical vacuum dealloying method using the CuZn alloy pre- cursors （Cu30Zn70, Cu40Zn60 and Cu50Zn50 alloys）. The micron porous copper showed a three-dimensional continuous porous structure with 1-5 μm pore size. With the increase of the Zn content in the CuZn alloy, the pore structure of the porous copper was more uniform and ordered. Temperature was the key factor for physical dealloying, and the optimized temperature was 500 ℃ for the CuZn alloy. The pores would fuse and disappear when the temperature was over 500 ℃. Physical vacuum dealloying was an effective preparation method for porous copper, which can be used to prepare other porous metals based on the sublimation and the Kirkendall effect.

关键词： Dealloying Sublimation Kirkendall effect porous copper Cu-Zn alloy

porous current collector enables carbon superior electrochemical performance for K-ion capacitors

在线全文

学校读者我要写书评

暂无评论

引用

Rare Metals 2023年第1期42卷 134-145页

作者： Mei-Qi Liu Hui-Ming Li Zai-Yuan Le Jin-Fu Zhao Li-Min Chang Luan Fang Mei-Qi Hou Hai-Rui Wang Tian-Hao Xu Ping Nie Key Laboratory of Preparation and Applications of Environmental Friendly Material of the Ministry of Education College of ChemistryJilin Normal UniversityChangchun130103China Department of Chemical and Biomolecular Engineering University of CaliforniaLos AngelesCA90095USA

The current collector is an indispensable component in potassium-ion hybrid capacitors,which not only provides mechanical support to load electrode materials,but also collects and outputs the current ***,we investigate the effect of three different current collectors on the electrochemical properties of potassium ion capacitors using carbon black anode as a *** of better adhesion and lower charge transfer resistance,the specific capacity of half-cells assembled using three-dimensional(3D)porous copper foil(PCu)and copper as current collector is better than that of Al foil,which stabilizes at 138.2 and 132.8 mAh·g^(-1)after 100 cycles at 0.05 A·g^(-1).The potassium-ion capacitor assembled using PCu exhibits an excellent energy/power density of 86.1 Wh·kg^(-1)and 4000 W·kg^(-1),*** work will boost the rational design and provide an effective strategy to improve the performance of potassium-ion capacitors.

关键词： porous copper Current collector Anode Carbon anode Potassium-ion capacitor(PIC)