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Synthesis and alumina leaching mechanism of calcium sulphoaluminate

Transactions of Nonferrous Metals Society of China 2017年第9期27卷 2090-2095页

作者： Bo WANG Wei-qin CHU Yuan-liang HAO Shuo RONG Hui-lan SUN School of Materials Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018 China Hebei Key Laboratory of Material Near-net Forming Technology Hebei University of Science and TechnologyShijiazhuang 050018 China

Calcium sulphoaluminate(3CaO·3Al2O3·CaSO4,abbreviated as C4A3S)was synthesized by sintering at1375°C for2h with analytically pure carbonate calcium,alumina and dihydrate calcium *** crystal structure of C4A3S was characterized by XRD,SEM and *** leaching properties in Na2CO3solution were studied,and the leaching mechanism was investigated by means of Raman spectrum and *** results show that C4A3S has porous *** polycrystallines and single crystals coexist in C4A3S and grow along different *** alumina leaching rate of C4A3S is98.41%,which is higher than that of12CaO·7Al2O3under the optimal *** aluminum and sulfur elements exist in the leaching solution in the form of Al(OH)4and24SO,respectively,and the calcium exists as CaCO3in the leaching residues.

关键词： calcium sulphoaluminate synthesis alumina leaching

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医用增材制造——从前沿技术到产品研发

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Engineering 2020年第11期6卷 31-41页

作者：邱贵兴丁文江田伟秦岭赵宇张联盟吕坚陈代杰袁广银吴成铁卢秉恒杜如虚陈继明 Mo Elbestawi 顾忠伟李涤尘孙伟赵远锦赫捷金大地刘斌张凯李鉴墨 Kam W.Leong 赵德伟郝定均敖英芳邓旭亮杨惠林徐少克陈英奇李龙樊建平聂国辉陈芸曾晖陈玮赖毓霄 Department of Orthopedics Peking Union Medical College Hospital Chinese Academy of Medical Science & Peking Union Medical College National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong University National Engineering Research Center of Mg Materials and Applications and School of Materials Science & Engineering Shanghai Jiao Tong University Department of Spine Surgery Beijing Jishuitan Hospital Center for Translational Medicine Research and Development Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Engineering Laboratory of Biomaterials Additive Manufacturing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Center for Advanced Structural Materials City University of Hong Kong Shenzhen Research Institute Hong Kong Branch of National Precious Metals Material Engineering Research Center Department of Material Science and Engineering City University of Hong Kong Department of Mechanical Engineering City University of Hong Kong School of Pharmacy Shanghai Jiao Tong University China State Institute of Pharmaceutical Industry Shanghai Institute of Pharmaceutical Industry State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of the Chinese Academy of Sciences Micro- and Nano-Technology Research Center State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong University Shien-Ming Wu School of Intelligent Engineering Guangzhou International Campus South China University of Technology Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing University of Technology Beijing Engineering Research Center of Laser Technology Beijing University of Technology Key Laboratory of Trans-Scale Las

1.医用增材制造原料的研发和挑战医用增材制造的原料与其他多个领域使用的原料具有广泛通用性,这是构成三维(3D)打印领域的重要基础。这些领域的增材制造在材料类型、粉体特性、成型性和黏弹性等方面面临着相同的问题和挑战。例如,航空...

1.医用增材制造原料的研发和挑战医用增材制造的原料与其他多个领域使用的原料具有广泛通用性,这是构成三维(3D)打印领域的重要基础。这些领域的增材制造在材料类型、粉体特性、成型性和黏弹性等方面面临着相同的问题和挑战。例如,航空领域采用了多种金属材料,而生物医学领域会使用金属、聚合物和无机材料。在生物医学领域,

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Hydraulic control system of mechanical energy stored type powder high velocity compaction machine

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IOP Conference Series: materials Science and Engineering 2019年第1期638卷

作者： Dongdong You Qian Zhu Yanghui Zhu Fenglei Li National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of Technology Guangzhou 510640 China Metastable Materials Science and Technology State Key Laboratory Yanshan University Qinhuangdao 066004 China

An automatic control scheme of spring energy storage by hydraulic control of spring compression is presented and implemented in this paper to improve the automation level, control accuracy and production efficiency of the existing HVC machine with mechanical energy storage type. The hydraulic system, servo system, and PLC codes are developed. The PID control optimization is applied for the control error accuracy of the machine. The transfer function is derived, and the genetic algorithm is used to optimize the PID parameters. The control scheme is implemented in the updated machine. The experimental results of iron powder HVC are in agreement with the predicted and calculated values. The reliability and validity of the automatic control scheme is verified. The research facilitates the industrial application of this kind of equipment.

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3D characterization of the primary Al3Sc phases in an Al-Sc alloy using Synchrotron X-ray tomography and electron microscopy

arXiv

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arXiv 2019年

作者： Zhao, Yuliang Zhang, Weiwen Koe, Billy Du, Wenjia Wang, Mengmeng Wang, Weilin Boller, Elodie Rack, Alexander Sun, Zhenzhong Mi, Jiawei Neutron Scattering Technical Engineering Research Centre School of Mechanical Engineering Dongguan University of Technology Dongguan523808 China National Engineering Research Centre of Near-net-shape Forming for Metallic Materials South China University of Technology Guangzhou510641 China Department of Engineering University of Hull East YorkshireHU6 7RX United Kingdom Diamond Light Source Harwell Science and Innovation Campus Didcot OxfordshireOX11 0DE United Kingdom Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China ESRF-The European Synchrotron 71 Avenue des Martyrs Grenoble38000 France

The three-dimensional structures of the primary Al3Sc particles in an Al-2%Sc master alloy were studied by synchrotron X-ray microtomography, scanning and transmission electron microscopy. The Al3Sc phases were found to be a single cube and a cluster of cubes. The surface area, equivalent diameter of the Al3Sc cubes increased with the increasing of cube volume, but the specific surface area decreases. The primary Al3Sc cubes and Al-matrix have the same crystal orientation, indicating that the Al3Sc phases are the heterogeneous nucleation sites for Al. The experimental results show that α-Al2O3 are the possible nucleation sites for the Al3Sc *** Codes 82D25 Copyright © 2019, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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Research on Stamping Process Design and forming Law of Floor Beam

Research on Stamping Process Design and Forming Law of Floor...

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2017 2nd International Conference on Electrical and Electronics: Techniques and Applications（EETA2017）

作者： Hua-jun YAN Qi-qi ZANG Shi-bo MA Shuang-jie ZHANG Yu-zhong LIU School of Materials Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-net Forming Technology Hebei Engineering Technology Research Center of Precision Punching Process and Die

Aiming at the problems of cracking and wrinkling in the forming process of floor beam, the design of the drawing die is finished, and the finite element analysis software DYNAFORM is used to analyze the drawing process of the floor beam, and the effects of blank holder force and drawbead on the formed part are analyzed. With the maximum thinning rate and maximum thickening rate as the evaluation index, the optimized process parameters are that blank holder force is F=270 kN and drawbead is set to segmented drawbead. The results have important reference value for the forming application of floor beam.

关键词： Process parameter forming law Thinning rate Thickening rate Wrinkling Cracking

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Fog Harvesting System: Cactus-Inspired Conical Spines with Oriented Microbarbs for Efficient Fog Harvesting (Adv. Mater. Technol. 12/2019)

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Advanced materials Technologies 2019年第12期4卷

作者： Shengzhu Yi Jian Wang Zhipeng Chen Bin Liu Lei Ren Liang Liang Lelun Jiang Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument School of Biomedical Engineering Sun Yat-Sen University Guangzhou 510006 P. R. China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of Technology Guangzhou 510640 P. R. China

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Synchrotron X-ray tomography investigation of 3D morphology of intermetallic phases and pores and their effect on the mechanical properties of cast Al-Cu alloys

arXiv

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arXiv 2018年

作者： Zhao, Yuliang Wang, Zhi Zhang, Chun Zhang, Weiwen Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou510641 China National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of Technology Guangzhou510641 China School of Engineering & Computer Science University of Hull East YorkshireHU6 7RX United Kingdom School of Mechanics and Civil & Architecture Northwestern Polytechnical University Xi'an710072 China

The influence of Fe content on the three-dimensional (3D) morphology of Fe-rich intermetallic phases (Fe phases), Al2Cu, and pores and their effect on the mechanical properties of cast Al-5.0Cu-0.6Mn alloys with 0.5 and 1.0 wt. % Fe are characterized using synchrotron X-ray tomography and a tensile test. The results show that both Fe phases and Al2Cu exhibit a complex 3D network structure, and the pores are irregular with complex interconnected and near-globular shape. As the Fe content increases from 0.5 % to 1.0 %, the volume fraction and equivalent diameter of Fe phases decrease, whereas Al2Cu shows the opposite trend;however, both their interconnectivities decrease. Skeletonization analysis of four different Fe phases shows that the Chinese-script-shaped Fe phase is relatively more compact than the plate-like Fe phases. The equivalent diameter and sphericity of pores vary with Fe content, and their relationships follow exponential functions, Y = 7.14*X-1.29 and Y = 7.06*X-1.20, respectively. The addition of Fe results in a decrease in the ultimate tensile strength and elongation from 223.7 MPa to 199.8 MPa and from 5.51 % to 3.64 %, respectively, owing to more sharp-edged Fe phases and pores and less Al2Cu, resulting in stress concentration during tensile *** Codes 74AXX Copyright © 2018, The Authors. All rights reserved.

关键词： Intermetallics

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The structure and capability of hot deformation Cu-1.2Cr-0.2Zr in aging state

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IOP Conference Series: materials Science and Engineering 2018年第1期303卷

作者： J W Qiao L Fu Y Y Wang Y H Ding X Ma School of Material Science and Engineering Tianjin University of Technology School of Electrical and Electronic Engineering Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin University of Technology Tianjin 300384 China. Tianjin Engineering Center of Near-Net-Shape Forming Technology for Metallic Materials Tianjin 300384 China

Cu-Cr-Zr alloy belongs to precipitation-enhanced, high-strength and high-conductivity copper alloys. The volume fraction of specimen deformation was 25% and the deformation rates were 0.01~1s-1 with the deformation temperature ranged from 500°C to 800 °C at Gleeble-1500 thermal simulator. The results state that the rheological stress of Cu-Cr-Zr alloy decreases with a rising temperature at a same deformation quantity. Along with the increasement of the strain rates and the temperatures during hot deformation, the grains of Cu-Cr-Zr alloy were elongated perpendicularly to the direction of compression. When the deformation temperature was 600 °C, some of fine recrystallized grains appeared.

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Numerical simulation of Failure Behaviors of CFRP laminates on Hashin model coupled with cohesive elements

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IOP Conference Series: materials Science and Engineering 2018年第3期382卷

作者： Hongbo Huang Xu Ma Jingwen Qiao Ding Yanhong School of material science and engineering Tianjin university of Technology Tianjin 300384 China Tianjin Engineering Center of Near-Net-Shape Forming Technology for Metallic Materials Tianjin 300384 China School of Electrical and Electronic Engineering Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin University of Technology Tianjin 300384 China

The failure modes of carbon fiber reinforced composites (CFRP) was investigated in this study. A method of combination of Hashin model and cohesive elements was proposed to predict failure behaviors in T300/PR319 and AS carbon/epoxy laminates by FE model, while executing three-point bending test. The result shows that there are differences between the response of two materials during bending test. Fiber compression and matrix tension in T300/PR319 and AS carbon/epoxy appears first relatively. Subsequently delamination occurs in AS carbon/epoxy as a result of cohesive elements. A evaluating method of measuring fracture process displacement was also proposed under new damage criterion.

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Kinematics Analysis and Optimization of the Fast Shearing-extrusion Joining Mechanism for Solid-state Metal

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Chinese Journal of Mechanical Engineering 2015年第6期28卷 1123-1131页

作者： ZHANG Shuangjie YAO Yunfeng LI Lingchong WANG Lijuan LI Junxia LI Qiang School of Materials Science and Engineering Hebei University of Science and Technology Key Laboratory of Material Near-net Forming Technology of Hebei Province School of Mechanical Engineering Yanshan University

Dynamical Joining of the solid-state metal is the key technology to realize endless hot rolling. The heating and laser welding method both require long joining time. Based on super deformation method, a 7-bar and 2-slider mechanism was developed in Japan, and the joining time is less than 0.5 s, however the length of each bar are not reported and this mechanism is complex. A relatively simple 6-bar and 1-slider mechanism is put forward, which can realize the shearing and extrusion motion of the top and bottom blades with a speed approximately equal to the speed of the metal plates. In order to study the kinematics property of the double blades, based on complex vector method, the multi-rigid-body model is built, and the displacement and speed functions of the double blades, the joining time and joining thickness are deduced, the kinematics analysis shows that the initial parameters can＇t satisfy the joining process. Hence, optimization of this mechanism is employed using genetic algorithm（GA） and the optimization parameters of this mechanism are obtained, the kinematics analysis show that the joining time is less than 0.1 s, the joining thickness is more than 80% of the thickness of the solid-state metal, and the horizontal speeds of the blades are improved. A new mechanism is provided for the joining of the solid-state metal and a foundation is laid for the design of the device.

关键词： endless rolling solid-state metal dynamical joining mechanism kinematic optimization genetic algorithm

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