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A Low-Cost Nano/Micro Structured-Silicon-MWCNTs from Nano-Silica for Lithium Storage
Xuejiao Feng,Tengda Ding,Hongmin Cui,Nanfu Yan,Fei Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.3
Despite the fact that silicon material can be synthesized from various sources, deriving them from silica resources is of strategic significance for the industrial processing. Here a low-cost nano/ micro structure of Si–CNT was derived from nano-SiO2 and multiwall carbon nanotubes (MWCNTs) with simple methods. By employing table salt (NaCl) as a heat scavenger for the magnesiothermic reduction, the nano/micro structure of the material was remained effective. Comparing to ball milling, a combination of SiO2, MWCNTs and NaCl by spray drying achieved the long cycle life for Si–CNT composite. This material presented a stable capacity above 968.1 mAh g-1 with excellent capacity retention of 85.4% at the 150th cycle versus the 2nd one. The Si nanoparticles, very small particle size in 10–20 nm, homogenously dispersed in electronically conductive network of MWCNTS, which accommodate the volume change of Si and reinforce highly conductivity of the Si–CNT composite during repeated cycles. Combined with its low-cost and up-scaling technologies, Si–CNT composite is a promising anode material in rechargeable lithium batteries with high electrochemical performance.
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Study on tool wear for efficient grooving blisk with disc milling cutter
Qingsi Cheng,Song Wang,Hongmin Xin,Jian Zhang,Changfeng Yao,Minchao Cui,Guangping Li 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Tool wear has an important influence on machining quality, cost, cutting force and heat. Grooving blisk with disc milling cutter is 3-4 times more efficient than plunge milling and side milling, but the tool wear is serious because of the large milling force and high milling temperature during the machining process. In the study, the damage and wear morphology of the tool was observed by focused ion/double beam system; the wear mechanism was studied by energy spectrum analysis; the tool life curve was drawn by the increase of flank wear. The experimental results show that the main wear and damage morphologies of disc milling cutter are chip sticking to the tool, chip accumulation, edge collapse, peeling, crack, plastic deformation and boundary wear; the main wear mechanism are abrasive wear, adhesive wear, oxidation wear and diffusion wear; the wear rate of the left blade is the fastest, followed by the right blade, and the wear rate of the middle blade is the slowest. These results can provide guidance for iimproving tool life, optimizing tool and mproving machining processes.
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Zhang Ning,Liu Huan,Zhang Tianwen,Kan Hongmin,Wang Xiaoyang,Cui Xingyu 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
The paper was prepared spherical hexagonal boron nitride with different microstructures under flowing ammoniaatmosphere. The effect of boron source component ratios (molar ratio of borax and boric acid) on the phase composition ofthe sample were studied: the work also explored the effect of boron source component ratio on the microstructure andadsorption performance of h-BN. Spherical hexagonal boron nitride had corresponding to shell structure, mesoporousstructure, and solid structure when the ratio of boron source components respectively was 1 : 0.5, 1 : 1, and 1 : 2. Between 1 : 1and 1:0.5, the former had an lower adsorptions at low relative pressures. On the contrary, the adsorption of former wouldincreased at higher relative pressures and reached up 276.02 cm3 g−1, and the maximum adsorption of the latter reached only228.20 cm3 g−1. Under any relative pressure, the adsorption capacity was the lowest when the boron source composition ratiowas 1 : 2.
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