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Graphitization of graphene oxide films under pressure
Chen, Xianjue,Deng, Xiaomei,Kim, Na Yeon,Wang, Yu,Huang, Yuan,Peng, Li,Huang, Ming,Zhang, Xu,Chen, Xiong,Luo, Da,Wang, Bin,Wu, Xiaozhong,Ma, Yufei,Lee, Zonghoon,Ruoff, Rodney S. Elsevier 2018 Carbon Vol.132 No.-
<P><B>Abstract</B></P> <P>Lightweight, flexible graphite foils that are chemically inert, high-temperature resistant, and highly electrically and thermally conductive can be used as component materials in numerous applications. “Graphenic” foils can be prepared by thermally transforming graphene oxide films. For this transformation, it is desirable to maintain a densely packed film structure at high heating rates as well as to lower the graphitizing temperatures. In this work, we discuss the pressure-assisted thermal decomposition of graphene oxide films by hot pressing at different temperatures (<I>i.e.</I>, 300 °C, 1000 °C, or 2000 °C). The films pressed at 1000 °C or 2000 °C were subsequently heated at 2750 °C to achieve a higher degree of graphitization. The combination of heating and pressing promotes the simultaneous thermal decomposition and graphitic transformation of G-O films. Films pressed at 2000 °C as well as films further graphitized at 2750 °C show high chemical purity, uniformity, and retain their flexibility. For films pressed at 2000 °C and then further heated at 2750 °C, the mechanical performances outperform the reported values of the “graphite” foils prepared by calendering exfoliated graphite flakes; the electrical conductivity is ∼3.1 × 10<SUP>5</SUP> S/m and the in-plane thermal conductivity is ∼1.2 × 10<SUP>3</SUP> W/(m·K).</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Yugong Dang,Yongyu Yao,Xiaozhong Deng,Genggeng Li,Chuang Jiang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
Special cold rotary forging method for the fabrication of the big wheels of hypoid gears is proposed. The proposed method is established on the basis of the requirements of antifatigue manufacturing processes and the tooth profile characteristics of hypoid gears combined with the movement and forming methods of cold rotary forging. The geometric grid model is constructed on the basis of the basic theory of elastic-plastic thermo-mechanical coupling finite element for metal. Reasonable process parameters and boundary conditions are established. Thus, the cold rotary forging finite element model is built. The springback tooth surface is reconstructed through the results of finite element numerical simulation. The size and distribution of the springback error is the detected. In the springback process, a large displacement and large rotation can occur, so a comprehensive displacement compensation algorithm is adopted to modify the rotary forging die, and a springback error compensation iteration system is constructed based on the modified algorithm. In the case of a camion driving axle gear, the correction of the rotary forging die is analyzed. Results show that the error is already within the allowed range through only three iterations, which proves the efficiency of the system. The modified die is used for machining experiments. The measurement results of the experiment gear are consistent with the simulation results, which proves the reliability of the system. The LTCA of the gear further proves its reliability in compensating for springback error using numerical simulation technique.
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Parallel Connected High Frequency AC Link Inverters Based on Full Digital Control
Sha, Deshang,Guo, Zhiqiang,Deng, Kai,Liao, Xiaozhong The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.4
This paper presents a full digital control strategy for parallel connected modular inverter systems. Each modular inverter is a high frequency (HF) AC link inverter which is composed of a HF inverter and a HF transformer followed by a cycloconverter. To achieve equal sharing of the load current and to suppress the circulating currents among the modules, a three-loop control strategy, consisting of a common output voltage regulation (OVR) loop, individual circulating current suppression (CCS) loops and individual inner current tracking (ICT) loops, is proposed. The ICT loops are implemented with predictive current control from which high precision current tracking can be obtained. The effectiveness of the proposed control strategy is verified by simulation and experimental results from parallel connected two full-bridge HF AC link inverter modules.
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Parallel Connected High Frequency AC Link Inverters Based on Full Digital Control
Deshang Sha,Zhiqiang Guo,Kai Deng,Xiaozhong Liao 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.4
This paper presents a full digital control strategy for parallel connected modular inverter systems. Each modular inverter is a high frequency (HF) AC link inverter which is composed of a HF inverter and a HF transformer followed by a cycloconverter. To achieve equal sharing of the load current and to suppress the circulating currents among the modules, a three-loop control strategy, consisting of a common output voltage regulation (OVR) loop, individual circulating current suppression (CCS) loops and individual inner current tracking (ICT) loops, is proposed. The ICT loops are implemented with predictive current control from which high precision current tracking can be obtained. The effectiveness of the proposed control strategy is verified by simulation and experimental results from parallel connected two full-bridge HF AC link inverter modules.
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