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Effect of Cooling Rate on Magnetic Properties of FeCoNi(CuAl)0.8 High Entropy Alloy
Xiangyun Zhang,Ding Guoqiang,Dong Jiao,ZiZhou Yuan 한국자기학회 2023 Journal of Magnetics Vol.28 No.2
The solidification process of an alloy has a significant influence on its microstructure and properties. In this article, the effect of cooling rate on the microstructure and magnetic properties of the FeCoNi(CuAl)0.8 high entropy alloys (HEAs) was investigated. Results showed that all the samples prepared at different cooling rates exhibited a duplex-phase structure of face-centered cubic (FCC) plus body-centered cubic (BCC). But the volume fraction of BCC and stacking density of the alloy increased with the increasing of cooling rate, leading to an increase in saturated magnetization. Furthermore, microstructure investigation showed that with the increasing of cooling rate, the grain size of the samples decreased, lattice distortion and residual stress increased, and more nanoprecipitates were embedded in the interdendritic phases of the sample, which may be responsible for the increase in coercivity of the alloy.
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Xiangyun Chen,Zexiao Zhang,Bing Yuan,Fengli Yu,Congxia Xie,Shitao Yu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Low-temperature carbonization–sulfonation two-step process or one-step sulfonation process wasemployed to draft sodium lignosulfonate (SLS), the primary biological macromolecule ingredient ofpapermaking black liquor, into lignin-based sulfonated carbon. The two-step lignin-based sulfonated carbonnamed SLC400,1S was found to be an efficient catalyst for clean Benzyl-alcohol (BA) route Friedel-Crafts (F-C) benzylation of benzene ring compounds. FT-IR, XRD, Raman spectra, XPS, SEM with EDXmapping,TGA-DSC, acid-base titration, and n-butylamine–acetonitrile titration characterizations demonstratedthat the specific two-step process could introduce porous properties and a large number of surfacesulfonic, hydroxyl, and carboxyl active groups into the structure of the prepared material, which wasfound to account for the good catalytic performance for benzylation. Similar to that of hierarchical mesoporousZSM-5 under optimal conditions, the apparent activation energy for benzylation of paraxylene(PX) with BA over SLC400,1S was estimated to be 119 kJmol1. The common by-product of BA route benzylation,dibenzyl ether (DBE), was almost inhibited because of the extraordinary activity of SLC400,1S andthe optimized reaction conditions. A 12-run recycling test demonstrated easy recovery and steadyreusability of the above lignin-based sulfonated carbon catalyst.
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Xiangyun Gao,Xiaoli Meng,Ao Shen,Xufei Zhang,Qiwei Wu 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
Hybrid excitation doubly salient motor (HEDSM) is suitable for aviation starter/generator because of the advantages of high-power density, high reliability and flexible control. However, the salient pole and slot structure can cause high torque ripple and serious nonlinear magnetic field distribution. In this paper, we present a multi-objective optimization design approach for the HEDSM. In order to increase the output torque of the motor and reduce the torque ripple of the motor, the Taguchi method is used to optimize parameters of the motor. The ANOVA is often used in traditional Taguchi method to analyze the data of orthogonal experiments to determine the final optimization result, but it is more suitable for single-objective optimization. Therefore, the grey relational analysis (GRA) is used instead of ANOVA to improve the Taguchi method, so as to complete the multi-objective optimization design of the motor. Finally, the simulation and analysis of characteristics for the HEDSM verifies the effectiveness of the optimization method, which enriches the rapid design and optimization methods of this kind of doubly-salient motors.
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Zhongliang Sun,Yongming Zhang,Xiangyun Deng,Jianbao Li,Chunrong Xiong 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Silicalite-1 and titanium containing silicalite-1 (TS-1) hollow fibers were fabricated with polyethylene imine (PEI) fibers as substrates. The acid treated PEI fibers were positively charged and can be effectively coated with silicalite-1 or TS-1 nanocrystals from their colloidal solution. The adsorbed silicalite-1 or TS-1 nanocrystals grew up and became more compact upon two days of vapor phase Ostwald ripening in autoclave. Silicalite-1 and TS-1 hollow fibers were obtained after calcination at 400 8C in air. The shell thickness of the hollow fibers is 1 mm. Hydroxylation of phenol with H2O2 was investigated over TS-1based catalysts in order to compare influences of nanocrystals composed macrostructure and Al2O3binder on the catalytic activities.
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Bihua Hu,Zhaohong Tang,Zhi Zhang,Jinqing Linghu,Jihong Qian,Xiangyun Qin,Bumin Meng,Rong Han 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.12
Currently, Z-source networks are widely employed to extend the output-voltage range of inverters operating at a low voltage DC source. However, these inverters are troubled by low power-conversion efficiency and an obvious current distortion due to the copper losses and core losses of the inductors. In addition, they have limited voltage levels. In this paper, a novel boost network composed of two power switches, two capacitors, and two diodes is proposed to overcome these shortcomings. Meanwhile, a corresponding modulation strategy is also set forth to achieve capacitor voltage self-balancing and to regulate the output AC voltage. Moreover, by adding more switched-capacitor cells, the range of the output voltage can be further improved, and the max DC/AC-voltage conversion ratio of the inverter with n cells is √3( n + 1)/3. At last, an inverter prototype with a 1 kW power rating is built, and the obtained results demonstrate that this inverter possesses the following superiorities: a wider range of output voltage, automatic balancing of the capacitor voltage, less current distortion, and high-efficiency power conversion.
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