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无线电能传输系统高效率低漏磁的全向环绕型有源磁屏蔽结构

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电子测量与仪器学报 2024年第1期38卷 94-105页

作者：李中启甘子玥任立权孔彭生熊鑫博程宇周鑫湖南工业大学电气与信息工程学院株洲412007 湖南大学电气与信息工程学院长沙410082 湖南工业大学轨道交通学院株洲412007

在电动汽车无线电能传输系统(WPT)中,如何通过电磁屏蔽技术来降低WPT系统中的漏磁,同时维持较高的传输效率是一个难题。为此本文提出了一种全向环绕型有源磁屏蔽线圈结构来减少WPT系统中的漏磁。首先,分析了该结构的磁屏蔽工作原理以及... 详细信息

在电动汽车无线电能传输系统(WPT)中,如何通过电磁屏蔽技术来降低WPT系统中的漏磁,同时维持较高的传输效率是一个难题。为此本文提出了一种全向环绕型有源磁屏蔽线圈结构来减少WPT系统中的漏磁。首先,分析了该结构的磁屏蔽工作原理以及设计思路,推导了该结构的数学模型;其次,根据本文线圈结构高效率低漏磁的特点,提出了一种线圈优化方法,得到了满足设计要求的线圈参数;最后,根据得到的线圈参数,搭建了一套基于所提线圈结构的WPT系统,并通过仿真和实验验证了该结构和方法的合理性。结果显示,在传输功率为4 kW时,本文提出的线圈结构在偏移0 cm时,目标面的最大漏磁为3.76μT,相比无屏蔽线圈结构降低了43.63%的漏磁,并且传输效率高达95.58%;在偏移10 cm时目标面的最大漏磁为6.03μT,仍符合漏磁安全标准,并且传输效率为92.92%,高于同尺寸无源屏蔽线圈结构和传统有源屏蔽线圈结构的传输效率。

关键词：电动汽车无线电能传输电磁屏蔽电磁兼容电磁场

Thermal Fatigue Behavior of SiC/MBAS Glass Coated Carbon/Carbon Composites

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稀有金属材料与工程 2009年第A3期38卷 45-49页

作者： Li Long Zeng Xierong Li Hejun xiong xinbo Xie Shenghui Zou Zizhao Shenzhen University Shenzhen 518060 China Shenzhen Key laboratory of Special Functional Materials Shenzhen 518060 China Northwestern Polytechnical University Xi＇an 710072 China

The thermal fatigue behavior of C/C composites coated with the SiC/MBAS glass (MoSi2 particle-containing boron aluminosilicate glass) coating, prepared by the two-step process of the pack cementation and procoating-sintering, was investigated in present paper. The experimental results indicated that the SiC/MBAS glass coating had an excellent thermal shock resistance in air at temperature up to 1873 K. During quick thermal cycle between 1873K and room temperature in air, the decrease of mass and mechanical property of the coated C/C composites was all slight. After thermal cycle for 50 times, the mass loss of the SiC/MBAS glass coated sample was only 0.22%; additionally, the remaining ratio of strength and modulus was no less than 95.2% and 99.4%, respectively. The decrease of the mechanical property during the thermal cycle was primarily due to the damnification of the fiber/matrix interfaces and the oxidation of the coated samples with oxygen.

关键词：热疲劳性能复合材料碳化硅涂层物理性能

Preparation of Bioactive Calcium Phosphate Coatingon Porous C/C Substrate by a Novel Deposition Technique

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Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 486-489页

作者： xiong xinbo ZENG Xierong LI Xiaohua Xie Shenghui ZOU Chunli Shenzhen Key Laboratory of Special Functional Materials Department of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

A novel heat substrate technique, high frequency inductive heat deposition （IHD）, was introduced to coat porous carbon materials, C/C and carbon felt to improve their bioactivity. The morphologies, composition and microstructure of the resulting coatings were examined by scanning electron microscopy （SEM）, energy dispersive spectra （EDS）, X-ray diffractometer （XRD） and Fourier transform infrared spectroscopy （FTIR）. The results show that, the calcium phosphate consisted of non-stoichiometric, CO3-containing and plate- like octacalcium phosphate （Ca8-xH2（PO4）6, OCP） could uniformly cover the entire porous surfaces of carbon materials. Good adhesion of the coating to carbon material substrates was observed.

关键词： carbon bioactive calcium phosphate coating inductive heat deposition

Synthesis of LiFePO_4 in situ vapor-grown carbon fiber (VGCF) composite cathode material via microwave pyrolysis chemical vapor deposition

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Chinese Science Bulletin 2011年第17期56卷 1832-1835页

作者： DENG Fei ZENG XieRong ZOU JiZhao HUANG JianFeng SHENG HongChao xiong xinbo QIAN HaiXia LI XiaoHua School of Materials Science and Engineering Northwestern Polytechnical University Xi' an 710072 China College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China Shenzhen Key Laboratory of Special Functional Materials Shenzhen 518060 China

One of the most important factors that limits the use of LiFePO 4 as cathode material for lithium ion batteries is its low electronic *** order to solve this problem,LiFePO 4 in situ vapor-grown carbon fiber (VGCF) composite cathode material has been prepared in a single step through microwave pyrolysis chemical vapor *** phase,microstructure,and electrochemical performance of the composites were *** with the cathodes without in situ VGCF,the initial discharge capacity of the composite electrode increases from 109 to 144 mA h g-1 at a 0.5-C rate,and the total electric resistance decreases from 538 to *** possible reasons for these effects are proposed.

关键词： LiFePO4 气相生长碳纤维化学气相沉积法复合阴极材料 VGCF 微波热解原位合成

Structure and Oxidation Behavior of a Plasma Sprayed Yttrium Silicates Coated SiC-C/C with a Glass Outer Sealant from 1573K to 1873K

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Journal of Wuhan University of Technology(Materials Science) 2008年第1期23卷 33-37页

作者：黄剑锋 LI Hejun ZENG Xierong CAO Liyun LI Kezhi xiong xinbo LI Long School of Materials Science and Engineering Shaanxi University of Science and Technology Xi an 710021 China C/C Composites Technology Research Center Northwestern Polytechnical University Xi an 710072 China Department of Materials Science Shenzhen University Shenzhen 518060 China

Different compositions of yttrium silicates coatings were deposited on SiC-C/C by plasma spraying and an outer borosilicate glass was applied on the yttrium silicates coatings surfaces. The structure of the multi-layer coatings was characterized by XRD and SEM analyses. High temperature oxidation behavior of the multi-layer coatings coated C/C composites was investigated. Results show that SiC/2SiO2 Y2O3/1.5SiO2 Y203/ SiO2 Y2O3/glass multi-layer coating has better high temperature oxidation resistance, protecting carbon/ carbon composites from oxidation at 1 773 K in air for 164 h with the weight loss of 1.65%. The oxidation weight loss of the coated C/C with time accorded with parabolic rule in the temperature range 1 573 K-1 873 K; and the corresponding oxidation activation energy of the coated carbon/carbon composites is 132.2 kJ/mol.

关键词： carbon/carbon composites plasma spraying coating oxidation behavior

Kinetics on Conversion of Chemical liquid Vaporization Deposited Monetite Coating to HA on Carbon/Carbon Composites

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Kinetics on Conversion of Chemical liquid Vaporization Depos...

二次热压法制备SiC_p/Al复合材料的耐磨性能研究

2014中国功能材料科技与产业高层论坛

作者： xiong xinbo Tu Jianxin Zeng Xierong Ma Jun Shen Zhen Key Laboratory of Special Functional Materials Department of Materials Science and EngineeringShen Zhen University

A monetite coating was deposited on Carbon/Carbon composites（C/C）by a chemical liquid vaporization deposition（CLVD）method,and then hy-drothermally conversed to a hydroxyapatite（HA）*** kinetics onthe transformation of the monetite to HA under hydrothermal conditions was *** results showed that the conversionrate of the monetiteto HA increased as hydrothermaltime and temperature *** conversion ofthe monetitecoating to HA was controlled by a surface reaction,whose activation energy was calculated to be 25.1kJ/mol.

关键词： Monetite Hydroxyapatite Coating,Carbon/carbon composite Kinetics

来源： cnki会议评论

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特种铸造及有色合金 2007年第3期27卷 172-174页

作者：谢盛辉曾燮榕熊信柏深圳大学材料科学与工程学院深圳市特种功能材料重点实验室

采用快速升温二次热压法制备了（10～30）SiC/Al-0.8Si-1.2Mg-0.4Cu复合材料,并研究其与钢球对磨的摩擦磨损规律.结果表明,二次热压变形法能有效抑制剧烈的界面反应,得到高致密的SiCp/Al复合材料.复合材料的摩擦因数随SiC含量增加而增大... 详细信息

采用快速升温二次热压法制备了（10～30）SiC/Al-0.8Si-1.2Mg-0.4Cu复合材料,并研究其与钢球对磨的摩擦磨损规律.结果表明,二次热压变形法能有效抑制剧烈的界面反应,得到高致密的SiCp/Al复合材料.复合材料的摩擦因数随SiC含量增加而增大,大载荷下增幅更明显.试验条件下,SiC/Al复合材料与GCr15钢的摩擦因数在0.3～0.5之间.复合材料的磨损率开始随载荷增大而增大,载荷超过5 N后,SiC含量小于15%的试样磨损率继续增大,而SiC含量大于20%的试样的磨损率则急剧减少.这是由于高SiC含量试样在大载荷下表层生成的Al2O3增强了摩擦层.在载荷7 N时,30SiC/Al复合材料的磨损率只有1.14×10^-3 mm3/m,说明该复合材料更适宜在大载荷下应用.

关键词： SiCp/Al复合材料二次热压摩擦因数磨损率

衬底温度对C/C复合材料表面超声感应加热法制备CaHPO_4涂层的影响（英文）

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稀有金属材料与工程 2014年第7期43卷 1594-1599页

作者：熊信柏褚岑岑曾燮榕邹继兆深圳大学深圳市特种功能材料重点实验室广东深圳518060

采用超声感应加热法在H2O2水热处理C/C复合材料表面沉积了CaHPO4涂层,借助SEM、XRD、FTIR、EDS等手段,研究了衬底温度对涂层的微观结构的影响,并通过划痕测试评价涂层与C/C基体之间的结合强度,同时运用分析天平测量质量以研究涂层的沉... 详细信息

采用超声感应加热法在H2O2水热处理C/C复合材料表面沉积了CaHPO4涂层,借助SEM、XRD、FTIR、EDS等手段,研究了衬底温度对涂层的微观结构的影响,并通过划痕测试评价涂层与C/C基体之间的结合强度,同时运用分析天平测量质量以研究涂层的沉积动力学。结果显示,所制得的CaHPO4涂层钙磷比为1.2左右,晶格中出现碳离子。涂层形貌无明显变化,但是伴随温度的升高,涂层致密度降低。涂层与基体之间的结合强度随温度升高而增强,但内聚强度随温度升高而减弱。CaHPO4涂层的感应加热沉积过程受表面化学反应控制,沉积活化能为46.7 kJ/mol。

关键词：涂层碳磷酸氢钙划痕测试感应加热沉积

A Dual Yamabe Flow and Related Integral Flows

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Chinese Annals of Mathematics,Series B 2024年第3期45卷 319-348页

作者： Jingang xiong School of Mathematical Sciences Laboratory of Mathematics and Complex SystemsMinistry of EducationBeijing Normal UniversityBeijing 100875China

The author studies a family of nonlinear integral flows that involve Riesz potentials on Riemannian manifolds. In the Hardy-Littlewood-Sobolev (HLS for short)subcritical regime, he presents a precise blow-up profile exhibited by the flows. In the HLS critical regime, by introducing a dual Q curvature he demonstrates the concentrationcompactness phenomenon. If, in addition, the integral kernel matches with the Green’s function of a conformally invariant elliptic operator, this critical flow can be considered as a dual Yamabe flow. Convergence is then established on the unit spheres, which is also valid on certain locally conformally flat manifolds.

关键词： Hardy-Littlewood-Sobolev functional Dual Q curvature Integral flow