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Role of Co Content on Densification and Microstructure of WC–Co Cemented Carbides Prepared by Selective Laser Melting

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Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1245-1254页

作者： Jinyang Liu Jian Chen Li Zhou bingyao Liu Yang Lu Shanghua Wu Xin Deng Zhongliang Lu Zhipeng Xie Wei Liu Jianye Liu Zhi Qu School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China School of Electromechanical Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510635China Master Group(Guangdong)Technology Research Co LtdYunfu 527400China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China Guangdong Xi’an Jiaotong University Academy Foshan 528300China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing 100091China Guangdong Hanbang 3D Technology Co. LtdZhongshan 528427China Guangdong Fenghua Zhuoli Technology Co. LtdFoshan 528225China

WC–Co cemented carbides, well-known as the conventional tooling materials, have not been successfully produced by one step additive manufacturing processes such as selective laser melting(SLM) yet. The microstructure evolution as well as WC grain growth behavior has rarely been investigated in detail during SLM process. In this study, the WC–Co cemented carbides with different Co contents(12–32 wt%) were prepared by optimized SLM processes for comparative investigation of densification behavior, microstructure characterization and mechanical property. The increase in Co content in feedstock carbide granules can improve the densification behavior during SLM process. The SLM processed WC-12 Co shows larger average WC grain size and higher percentage of coarser WC grains as compared with both WC-20 Co and WC-32 Co. The microstructure characterization, combined with finite element simulation, shows the WC grain growth mechanisms include agglomeration and dissolution-deposition of WC during SLM process and agglomeration of WC is an important mechanism especially for WC–Co cemented carbides with Co content as low as 12 wt%. The comparison between horizontal(perpendicular to the SLM laser beam) and vertical(parallel to the SLM laser beam) cross sections of carbides shows that SLM process introduces a certain degree of microstructure and mechanical behavior anisotropy for WC-12 Co, WC-20 Co, and WC-32 Co.

关键词： Cemented carbides Selective laser melting Microstructure Densifi cation behavior Finite element simulation

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STUDY OF AMORPHOUS Fe-Zr-B-(Cu) ALLOYS BY MECHANICAL ALLOYING

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Acta Metallurgica Sinica(English Letters) 1995年第3期8卷 215-218页

作者： ZHANG Jianqiang WU bingyao Southeast University,Nanjing, China WU Hiaohua wang Guiqin ZHAO Jiwan Nanjing University, China

The technique of mechanical alloying(MA) for preparing amorphous Fe-Zr-B-(Cu) alloys has been studied The structure of samples was analysed by X-ray diffractometry, electron microscopy and Mssbauer *** results show that Fe78Zr10B12 sample of a nearly complete amorphous phase may be prepared but in Fe91Zr7B2 sample metastable b c c phase was obtained Using the same procedure a mixture of amorphous phase and α-Fe(Zr, B) was generated in Fe85Zr7B8. Furthermore,the results of Mssbauer reveal that there are two kinds of short-range ordered phases in the sample. While adding Iat% Cu in Fe78Zr10B12 or Fe85Zr7B8 sample, it is found that the hyperfine field of amorphous phases decreases significantly.

关键词： mechanical alloying Fe-Zr-B(Cu)amorphous alloy Mssbauer spectrum

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Optical coherence tomography angiography in diabetic retinopathy: a review of current applications

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Eye and Vision 2019年第1期6卷 312-321页

作者： Kai Yuan Tey Kelvin Teo Anna C.S.Tan Kavya Devarajan bingyao Tan Jacqueline Tan Leopold Schmetterer Marcus Ang Hobart Clinical School Level 343 Collins StreetHobartTAS 7000Australia Singapore National Eye Centre 11 Third Hospital AveSingapore 168751Singapore Singapore Eye Research Institute 20 College Road Discovery TowerLevel 6 The AcademiaSingapore 169856Singapore Singapore National Eye Centre 11 Third Hospital AveSingapore 168751Duke-NUS Medical School8 College RdSingapore 169857Singapore

Background:Diabetic retinopathy(DR)is a leading cause of vision loss in ***,the standard imaging technique to monitor and prognosticate DR and diabetic maculopathy is dye-based *** the introduction of optical coherence tomography angiography(OCTA),it may serve as a potential rapid,non-invasive imaging modality as an *** text:Recent studies on the role of OCTA in DR include the use of vascular parameters e.g.,vessel density,intercapillary spacing,vessel diameter index,length of vessels based on skeletonised OCTA,the total length of vessels,vascular architecture and area of the foveal avascular *** quantitative measures may be able to detect changes with the severity and progress of DR for clinical *** may also serve as a non-invasive imaging method to detect diabetic macula ischemia,which may help predict visual ***,there are many limitations of OCTA in DR,such as difficulty in segmentation between superficial and deep capillary plexus;and its use in diabetic macula edema where the presence of cystic spaces may affect image *** applications of OCTA in the anterior segment include detection of anterior segment ischemia and iris neovascularisation associated with proliferative DR and risk of neovascular ***:OCTA may potentially serve as a useful non-invasive imaging tool in the diagnosis and monitoring of diabetic retinopathy and maculopathy in the *** studies may demonstrate how quantitative OCTA measures may have a role in detecting early retinal changes in patients with diabetes.

关键词： Optical coherence tomography angiography Fluorescein angiography Diabetic retinopathy Screening Monitoring

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The Study on Soft Starting of Belt Conveyor using Two-input-outlet Fuzzy Control Model

The Study on Soft Starting of Belt Conveyor using Two-input-...

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The 2nd International Conference on Applied Mechanics and Mechanical Engineering(ICAMME 2011)

作者： Chen bingyao Inner Mongolia University Science and Technology

Constant–current soft starting on induction motor based on fuzzy control is characterized as low system overshoot, fast response and relative stable starting process, so it can better solve the shortcomings existed in traditional methods and PID control methods, and improve the whole system reliabilityIn this article a special fuzzy control is adopted to complete the starting process, in which thyristor is the main current components and MCU is the control coreAnd this makes the entire starting process out of current impact.

关键词： induction motor starting process fuzzy control hardware circuit software analysis

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The role of Cu crystallographic orientations towards growing superclean graphene on meter-sized scale

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Nano Research 2022年第4期15卷 3775-3780页

作者： Xiaoting Liu Jincan Zhang Wendong wang Wei Zhao Heng Chen bingyao Liu Mengqi Zhang Fushun Liang Lijuan Zhang Rui Zhang Ning Li Yuexin Zhang Yuchen Liu Kaicheng Jia Luzhao Sun Yixuan Zhao Peng Gao Qinghong Yuan Li Lin Hailin Peng Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Beijing Graphene Institute Beijing 100095China Department of Engineering University of CambridgeCambridgeCB30FAUK School of Physics and Astronomy University of ManchesterManchesterM139PLUK State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Electron Microscopy Laboratory and International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Centre for Theoretical and Computational Molecular Science Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneQLD 4072Australia School of Materials Science and Engineering Peking UniversityBeijing 100871China

Chemical vapor deposition(CVD)-grown graphene films on Cu foils,exhibiting fine scalability and high quality,are still suffering from the adverse impact of surface contamination,i.e.,amorphous *** the recent successful preparation of superclean graphene through Cu-vapor-assisted reactions,the formation mechanism of amorphous carbon remains unclear,especially with regard to the functions of ***,we have found that the crystallographic orientations of underlying metal substrates would determine the cleanness of graphene in such a way that slower diffusion of active carbon species on asformed graphene-Cu(100)surface is the key factor that suppresses the formation of *** facile synthesis of clean graphene is achieved on the meter-sized Cu(100)that is transformed from the polycrystalline Cu ***,a clean surface of graphene on Cu(100)ensures the reduction of transfer-related polymer residues,and enhanced optical and electrical performance,which allows for versatile applications of graphene in biosensors,functioning as flexible transparent *** work would offer a promising material platform for the fundamental investigation and create new opportunities for the advanced applications of high-quality graphene films.

关键词： superclean graphene Cu crystallographic orientations Cu(100)foil improved electrical performance

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Discussion on the Cultivation of the Core Quality of Middle School Students’ Physical Education in Primary School Physical Education Teaching

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Journal of Contemporary Educational Research 2023年第7期7卷 30-34页

作者： Xin Li bingyao Niu Yu Du Jinghe New City No.2 School Xianyang 713700Shaanxi ProvinceChina

In the context of quality education,a wider exploration of physical education has been carried out,but at the same time higher requirements have been put forward for school sports *** is essential to pay attention to the teaching and training of physical knowledge and skills in physical education training as well as cultivate the core physical literacy of primary school *** core quality of physical education is the main part of the basic quality of primary and middle school students,which is of great significance to their learning and *** article will explore the training methods of primary and middle school students’basic quality in school physical education courses for reference.

关键词： Physical education Core literacy Training strategies Curriculum standards

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Tuning Zn^(2+) coordination tunnel by hierarchical gel electrolyte for dendrite-free zinc anode

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Science Bulletin 2022年第9期67卷 955-962,M0004页

作者： bingyao Zhang Liping Qin Yun Fang Yizhao Chai Xuesong Xie Bingan Lu Shuquan Liang Jiang Zhou School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083China College of Biological and Chemical Engineering Guangxi University of Science and TechnologyLiuzhou 545006China School of Physics and Electronics Hunan UniversityChangsha 410083China

Aqueous zinc-ion batteries(ZIBs)are perceived as one of the most upcoming grid-scale storage ***,the issues of electrode dissolution,dendrite formation,and corrosion in traditional liquid electrolytes have plagued its *** this work,Zn dendrite growth and side reactions are effectively suppressed by a highly-confined tannic acid(TA)modified sodium alginate(SA)composite gel electrolyte(TA-SA).The ion-confinement effect is enhanced by divalent zinc ions coordinated with carboxyl groups and chelated with phenolic hydroxyl groups,thus guiding and regulating Zn deposition to achieve steady zinc plating/stripping *** a consequence,the Zn/TA-SA/NH_(4)V_(4)O_(10) full cells deliver a high specific capacity of 238.6 mAh g^(-1) and maintain 94.51%over 900 cycles at 2 A g^(-1).Notably,after resting over 5 d,the capacity can be stabilized with a capacity retention of 97.25%after 200 cycles at 2 A g^(-1).This highlyconfined and hydrogen bond-strengthened gel electrolyte may provide an effective strategy for the future development of quasi-solid-state metal batteries.

关键词： Natural polymers Hydrogel electrolytes Cycling stability Self-discharge Aqueous zinc-ion batteries

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半固态触变成形坯料二次加热技术分析

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特种铸造及有色合金 2000年第6期20卷 58-61页

作者：吴炳尧戴挺东南大学

对半固态坯料二次感应加热技术进行了较为系统的介绍和分析。触变成形对坯料固相分数十分敏感 ,故控制加热温度精度十分关键。加热系统设计力求在最大软化度下的加热周期最短 ,且尽可能不出现“象足” ,为此要注意减少坯料顶部和底部的... 详细信息

对半固态坯料二次感应加热技术进行了较为系统的介绍和分析。触变成形对坯料固相分数十分敏感 ,故控制加热温度精度十分关键。加热系统设计力求在最大软化度下的加热周期最短 ,且尽可能不出现“象足” ,为此要注意减少坯料顶部和底部的热扩散和坯料从加热系统搬运到成形机械过程中的温降。目前尚无法可靠地定量检测坯料过软化的问题 ,单靠大量试验难以改进二次加热系统。

关键词：半固态加工坯料二次加热固相分数触变成形

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压铸脱模剂喷涂新工艺——脉冲喷涂

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特种铸造及有色合金 2005年第3期25卷 158-159页

作者：戴挺胡心平吴炳尧东南大学山东轻工业学院

提出了一种新型的脱模剂喷涂工艺———脉冲喷涂。利用有限元方法对脉冲喷涂和传统的连续喷涂进行了初步对比分析 ,并在压铸厂进行了一定模次的实效验证 ,结果表明脉冲喷涂使得模具内的温度梯度比传统连续喷涂时的温度梯度大幅降低 ,有... 详细信息

提出了一种新型的脱模剂喷涂工艺———脉冲喷涂。利用有限元方法对脉冲喷涂和传统的连续喷涂进行了初步对比分析 ,并在压铸厂进行了一定模次的实效验证 ,结果表明脉冲喷涂使得模具内的温度梯度比传统连续喷涂时的温度梯度大幅降低 ,有利于减小热应力的产生 ,从而提高模具寿命 ,同时可减少脱模剂的使用量 ,改善铸件表面品质。

关键词：压铸脱模剂脉冲喷涂

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我国仲裁员任职制度的合理性分析与完善建议

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国际商务研究 2020年第6期41卷 86-93页

作者：凌冰尧华东政法大学国际法学院上海200042

我国仲裁员任职制度主要涉及仲裁员法定资格与仲裁员名册两个问题。两者的背后隐含了同样的逻辑,即不相信当事人能够合理地选任仲裁员,事实上限制了当事人选任仲裁员的权利。这与目前主流的国际商事仲裁制度是相悖的,也不符合目前实践... 详细信息

我国仲裁员任职制度主要涉及仲裁员法定资格与仲裁员名册两个问题。两者的背后隐含了同样的逻辑,即不相信当事人能够合理地选任仲裁员,事实上限制了当事人选任仲裁员的权利。这与目前主流的国际商事仲裁制度是相悖的,也不符合目前实践的发展。对此,完善我国仲裁员任职制度的途径就是借鉴世界主流国家的商事仲裁制度,对仲裁采取更为开放的态度,同时也要兼顾我国自身仲裁行业的发展实力和特点,设立否定式列举的仲裁员法定资格和推荐式的仲裁员名册制度。

关键词：仲裁员法定资格仲裁员名册意思自治

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