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RISS 인기검색어
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- 저자 : Junyi Zhu (검색결과 4 건)
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Ji, Junyi,Liu, Jilei,Lai, Linfei,Zhao, Xin,Zhen, Yongda,Lin, Jianyi,Zhu, Yanwu,Ji, Hengxing,Zhang, Li Li,Ruoff, Rodney S. American Chemical Society 2015 ACS NANO Vol.9 No.8
<P>We report the fabrication of a three-dimensional free-standing nitrogen-doped porous graphene/graphite foam by <I>in situ</I> activation of nitrogen-doped graphene on highly conductive graphite foam (GF). After <I>in situ</I> activation, intimate “sheet contact” was observed between the graphene sheets and the GF. The sheet contact produced by <I>in situ</I> activation is found to be superior to the “point contact” obtained by the traditional drop-casting method and facilitates electron transfer. Due to the intimate contact as well as the use of an ultralight GF current collector, the composite electrode delivers a gravimetric capacity of 642 mAh g<SUP>–1</SUP> and a volumetric capacity of 602 mAh cm<SUP>–3</SUP> with respect to the whole electrode mass and volume (including the active materials and the GF current collector). When normalized based on the mass of the active material, the composite electrode delivers a high specific capacity of up to 1687 mAh g<SUP>–1</SUP>, which is superior to that of most graphene-based electrodes. Also, after ∼90 s charging, the anode delivers a capacity of about 100 mAh g<SUP>–1</SUP> (with respect to the total mass of the electrode), indicating its potential use in high-rate lithium-ion batteries.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-8/acsnano.5b03888/production/images/medium/nn-2015-03888k_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03888'>ACS Electronic Supporting Info</A></P>
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Chunfa Lin,Siyu Wang,Haoran Yan,Yuqiang Han,Junyi Zhu,Hao Shi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2
A novel structure-optimized SiC fiber reinforced metal-intermetallic-laminated composite (SiCf-Ti/Al3Ti) without intermetalliccenterline defect has been fabricated by vacuum hot pressing using stacked fibers and foils as well as Ti barrierlayer. Through microstructure characterization by SEM and EBSD, the mechanisms of centerline formation and structuraloptimization were investigated detailedly. The mechanical properties and fracture behaviors of the optimized and nonoptimizedSiCf-Ti/Al3Ti composites were studied via quasi-static compression tests. The experimental results indicatedthat the intermetallic centerline region existing at the mid-plane of Al3Tilayer in non-optimized composite mainly containsnewly-formed Kirkendall voids and gathered metallic oxides. Additionally, owing to the similar moving trails of fibers,oxides and voids in molten Al during hot pressing, SiC fiber is always accompanied with centerline, which causes the poorbonding of SiCf/Al3Ti interface. Unlike that, due to the adding of Ti barrier layer, SiC fibers are separated from centerlineand metallurgically bonded with Al3Tiintermetallic in the optimized composite. The compression testing results proved thatthe optimized SiCf-Ti/Al3Ti composite possesses superior strength and toughness compared with those of the non-optimizedcomposite. Besides, the extending of cracks along centerline often leads to large-scale centerline splitting and untimelySiCf/Al3Ti interface debonding in non-optimized composite. Nevertheless, cracks formed in optimized composite tend topropagate at the interfacial zone between layers instead of cutting off Al3Tilayer along its mid-plane. Moreover, ascribedto the well-bonded SiCf/Al3Ti interface, SiC fibers play an important role in strengthening and toughening the optimizedSiCf-Ti/Al3Ti composite by fiber bridging mechanism.
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Yuqiang Han,Qinghua Que,Ran Cheng,Ran Cheng,Chunfa Lin,Wenqing Han,Enhao Wang,Junyi Zhu,Haoran Yan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In present work, a novel SiCfreinforced (Al3Ti + Al3Ni)-based metallic–intermetallic laminate (Ti–(Al3Ti + Al3Ni)/SiCf-MIL) composite without centerline defect was prepared using Ti, Al foils, NiTi wires and SiC fibers by vacuum hot pressingsintering method. Electron backscatter diffraction was employed to characterize the microstructure and phase constituents ofTi–(Al3Ti + Al3Ni)/SiCf-MIL composite during various stages of preparation process. The elimination mechanism of intermetalliccenterline was discussed. Besides, quasi-static compressive performance and fracture toughness of the synthesizedcomposite were investigated. The experimental results indicated that as reaction time increasing, the NiTi/Al interfacialreaction occurred prior to the Ti/Al interfacial reaction to form an Al3Ti/Al3Ni zone. Then, the oxides gathered at the frontof Ti/Al interfacial reaction layer were dispersed in the intermetallic layer rather than being pushed together to generate thecenterline due to the Al3Ti/Al3Ni zone. After reaction, there were no residual NiTi phases and intermetallic layers mainlyconsisting of Al3Tiand Al3Niphases were obtained in this composite. In addition, high angle grain boundaries in Al3Tigrains occupied a large proportion, conversely, low angle grain boundaries dominated in Al3Nigrains. Furthermore, stressconcentration appears at the interface between layers instead of along the middle plane of intermetallic layer. Moreover,both compressive strength and fracture toughness of the composite are superior in comparison with SiCfreinforced Ti–Al3Timetallic–intermetallic laminate composite (Ti–Al3Ti/SiCf-MIL) ascribed to the elimination of centerline.
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