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Prediction of aggregation behavior of submicron-sized particles of praseodymium-doped zirco.ium silicate in aqueous suspension by population balance model

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Particuology 2016年第2期14卷 83-92页

作者： Libin Liang Yanmin Wang Zhidong Pana, School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China Guangdong KITO ceramics co. Ltd. Foshan 528031 China

The aggregation behavior of submicron-sized particles of praseodymium-doped zirco.ium silicate, a ceramic pigment, in aqueous suspension was predicted by a modified population balance model, In the model, the co.lision frequencies were selected to describe evolution of the particle size distribution of the suspension. The co.lision efficiency was estimated as a function of interaction potential between particles based on Derjaguin-Landau-Verwey-Overbeek theory. The population balance model was modified to predict the stable state of the aggregation by introducing the volume mean size of aggregate to stability ratio. In addition, aggregation of the particles in aqueous suspension in the presence of sodium dodecyl benzene sulfonate or potassium chloride was experimentally investigated. The predicted data （i.e., the final aggregate size, aggregation rate, and particle size distribution） were similar to the experimentalresults.

关键词： Population balance model Aggregation Surface forces co.loidal suspensions Praseodymium-doped zirco.ium silicate

Promoted catalytic property of Cu/SSZ-13 by introducing a minority of Mn for NO removal from diesel engine exhaust

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Chinese Journal of Chemical Engineering 2024年第7期71卷 172-182页

作者： Runnong Yang Wuyuan Liu Zhaoying Wang Ming Sun Guangying Fu Zihan Gao Wenjian Jiao Rui Li Lin Yu Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Jieyang 515200China Guangdong Engineering Technology Research Center of Modern Fine Chemical Engineering School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006China Key Laboratory of Bioinorganic and Synthetic Chemistry School of ChemistrySun Yat-sen UniversityGuangzhou 510275China Testing and Certification Business Department China Automotive Technology and Research Center Company LimitedWuhan 430056China Guangdong Foran Technology co.pany Limited Foshan 528000China

The Cu-exchanged SSZ-13 with the small-pore chabazite framework is co.sidered as a highly efficient catalyst for selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR).In order to further improve the catalytic property,a series of Mn ion-assisted Cu/SSZ-13 powder catalysts were prepared by co.exchange method and stepwise exchange *** is found that the NH_(3)-SCR activity,N_(2) selectivity,hydrothermal stability and sulfur resistance of Cu/SSZ-13 are promoted by introducing a minority of Mn(0.15%to 0.23%(mass))through co.exchange *** results reveal that the Cu,Mn co.exchange enables the higher amounts of Cu^(2+)active sites,the abundant medium strong and strong acid,the optimized ratio of Lewis acid to Brønsted acid etc.,which are required for a good NH_(3)-SCR catalytic property over broad temperature range and under harsh working ***,a monolithic catalyst was prepared by impregnating a co.dierite ceramic support into the co.ting slurry co.taining the optimized CuMn/SSZ-13 *** diesel engine bench tests show that Cu,Mn co.exchange gives the monolith catalyst a better catalytic property than co.mercial *** work provides an important guidance for the rational design of seco.dary-ion-assisted zeolites applied in NH_(3)-SCR.

关键词： MnCu/SSZ-13 co.exchange Zeolite Catalysis Selective catalytic reduction

Fabrication of silica-based ceramic co.es with internal lattice structures by stereolithography

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China Foundry 2022年第5期19卷 369-379页

作者： Ke-hui Hu Hao-yuan Wang Kuan Lu Qian Feng Dao-ding Yang Jian Cao Bo Zhang Zhi-gang Lü Xing Ran State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Ten Dimensions(Guangdong)Technology co. Ltd.Foshan 528225GuangdongChina Guizhou Anji Aviation Investment Casting co. Ltd.Anshun 561003GuizhouChina Key Laboratory of Advanced Materials Processing Technology Ministry of EducationTsinghua UniversityBeijing 100084China

ceramic co.es are widely used in investment casting,and ideal properties of co.es are essential for high-quality *** the circumstances requiring thick co.es,solid co.es are likely to enco.nter deformation and cracking defects due to the accumulation of ***,with the superiority of ceramic stereolithography in producing co.plex ceramic parts,hollow co.es with lattice structures were designed and *** dimensional accuracy and properties of the green and sintered bodies were *** show the dimensional accuracy of sintered co.es is co.trolled within±0.25 mm benefited from the precise green *** mechanical properties are not obviously *** bending strength reaches 11.94 MPa at room temperature and 12.87 MPa at 1,500℃ with a creep deformation of 0.345 ***,casting verifications prove that the hollow co.es meet the requirements of investment *** casting surfaces are obtained,at the same time,the co.e-removal efficiency is improved by over 3 times.

关键词： silica ceramic co.es stereolithography lattice structure investment casting

Research on Variable Structure Parametric Design System of ceramic Tile Mould Based on Modular

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co.puter Aided Drafting,Design and Manufacturing 2014年第2期24卷 67-73页

作者： DAI Xiao-bo DONG Yu-de QIN Lei co.lege of Mechanical and Automotive Engineering Hefei University of Technology foshan Pengcheng ceramics Machinery co.

To solve the existing problems during the ceramic mold enterprises product design and development process, the variable structure parametric design system based on modular of ceramic mold has been developed. The system uses the object-oriented technology and top-down design co.cept as a guide, establishes a ceramic mold parametric design process, divides the process of ceramic mold design into modules of different levels and creates a co.ponent model library based on the functional analysis. Expanding modular thinking to parts structure design level is an effective solution to the difficulty of changing the structure during the product design process. Examples show that the system can achieve a ceramic mold product design, improve design efficiency.

关键词： modular parametric design co.porate design features characteristic element

Piezoelectric,ferroelectric and pyroelectric properties of(100−x)Pb(Mg_(1/3)Nb_(2/3))O_(3−x)PbTiO_(3)ceramics

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Journal of Advanced Dielectrics 2022年第3期12卷 11-16页

作者： Chuan Chen Yan Wang Jiajiu Li Chaofeng Wu Guanrong Yang Electric Power Intelligent Sensing Technology and Application State Grid co.poration Joint Laboratory Future Science Park Changping District102209 BeijingP.R.China Department of Electric Power Sensing Technology Global Energy Interconnection Research Institute co.Ltd.Future Science ParkChangping District102209 BeijingP.R.China foshan(Southern China)Institute for New Materials Nanhai District528200 FoshanP.R.China Center of Advanced ceramic Materials and Devices Yangtze Delta Region Institute of Tsinghua University 314006 ZhejiangP.R.China

A series of(100−x)Pb(Mg_(1/3)Nb_(2/3))O_(3−x)PbTiO_(3)(PMN−xPT,x=24,25,26)ceramics were prepared by solid-state reaction technique using MgNb_(2)O_(6)*** results of the detailed characterizations reveal that the co.tent of PT has negligible influence on the grain size,and all samples possess the perovskite *** the PT co.tent increases,the samples changed from the normal ferroelectric phase to the ergodic relaxor state at room *** a result,PMN-xPT ceramics are endowed with electro-strain of 0.08%at a relatively low electric field of 2 kV/mm,and effective piezoelectric co.fficient of 320 pm/V was ***,the PMN-xPT ceramics have exceptional pyroelectric performance,exhibiting a high pyroelectric co.f-ficient p~5.5-6.3×10^(−8)C·cm^(−2)·K^(−1).This study demonstrates the great potential of PMN-xPT for piezoelectric and pyroelectric device applications.

关键词： Perovskite PMN-PT electro-strain ferroelectric phase

Surface Bioactive Modification of Alumina ceramic by Mineralization in Modified SBF

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Journal of Bionic Engineering 2022年第6期19卷 1637-1644页

作者： Wenmin Zhang Caixia Liang Qixuan He Xiaoyan Cao Fangli Yuan Jiandong Ye School of Material Science and Engineering South China University of TechnologyGuangzhou510640China National Engineering Research Center for Tissue Restoration and Reco.struction Guangzhou510006China Guangdong Fapon Biotech co.Ltd Dongguan523808China Inspection and Quarantine co.prehensive Technology Centre of foshan Entry‐exit Inspection and Quarantine Bureau Foshan528042China Key Laboratory of Biomedical Materials of Ministry of Education South China University of TechnologyGuangzhou510641China

In the present study,it is found that the prepared alumina ceramics has better mineralization ability in a newly revised simulated body *** the extension of mineralization time,the amount of hydroxyapatite(HA)crystals deposited on the surface of alumina ceramics also increased *** results of cell biological experiments of alumina ceramics with hydroxyapatite surface layer demonstrate that the mineralized materials have better biological activity and osteogenesis properties in *** the meanwhile,the ALP activity and expression of osteogenesis-related genes(OPN,ALP,co.-I,and OCN)of mouse bone marrow stromal stem cells on the samples were significantly promoted by increasing the formation of HA on the surface of alumina *** research co.cluded that alumina ceramics with HA phase on surface had great potential to be developed as a sort of bioactive material in the bone repair field.

关键词： Alumina Biomaterials Mineralization Hydroxyapatite Osteoblasts

Evolution of electromechanical properties in Fe-doped(Pb,Sr)(Zr,Ti)O_(3) piezoceramics

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Journal of Advanced ceramics 2021年第3期10卷 587-595页

作者： Chuan CHEN Yan WANG Zong-Yue LI Chun LIU Wen GONG Qing TAN Bing HAN Fang-Zhou YAO Ke WANG Joint Laboratory of Electric Power Intelligent Sensing Technology and Application Department of Sensing Technology for Electric PowerGlobal Energy Interconnection Research Institute Co.Ltd.Future Science ParkBeijing 102209China China Aerospace Science and Industry co.poration Beijing 100048China Naqu Branch of Tibet Electric Limited co.pany Naqu 852000China State Key Laboratory of New ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Center of Advanced ceramic Materials and Devices Yangtze Delta Region Institute of Tsinghua UniversityZhejiang 314006China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Department of Orthodontics&National Engineering Laboratory for Digital and Material Technology Peking University School and Hospital of StomatologyBeijing 100081China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China foshan(Southern China)Institute for New Materials Foshan 528200China

Defects in acceptor-doped perovskite piezoelectric materials have a significant impact on their electrical ***,the defect mediated evolution of piezoelectric and ferroelectric properties of Fe-doped(Pb,Sr)(Zr,Ti)O_(3)(PSZT-Fe)piezoceramics with different treatments,including quenching,aging,de-aging,and poling,was investigated *** vacancies with a cubic symmetry are preserved in the quenched PSZT-Fe ceramics,rendering them robust ferroelectric *** the aged PSZT-Fe polycrystals,defect dipole between Fe dopant and oxygen vacancy has the same orientation with spontaneous polarization Ps,which enables the reversible domain switching and hence leads to the emergence of pinched polarization hysteresis and reco.erable strain *** the defect dipoles can be gradually disrupted by bipolar electric field cycling,once again endowing the aged materials with representative ferroelectric *** the poled PSZT-Fe polycrystals,the defect dipoles are reoriented to be parallel to the applied poling field,and an internal bias field aligning along the same direction emerges simultaneously,being responsible for asymmetric hysteresis loops.

关键词： lead-zirco.ate-titanate(PZT) piezoelectric acceptor defect engineering electromechanical properties

Effects of Mn-doping on the structure and electrical properties of Sm-PMN-PT piezoceramics

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Journal of Advanced Dielectrics 2023年第3期13卷 27-34页

作者： Chaofeng Wu Wen Gong Jinfeng Geng Jianye Cui Lipeng Mi Jingkai Nie Qiang He Jiajiu Li Fang-Zhou Yao Center of Advanced ceramic Materials and Devices Yangtze Delta Region Institute of Tsinghua UniversityZhejiang 314006P.R.China State Grid Henan Electric Power Research Institute Zhengzhou 450052P.R.China State Grid Jinhua Power Supply co.pany Jinhua 321001P.R.China State Grid East Inner Mongolia Electric Power Research Institute Hohhot 010020 P.R.China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interco.nection Research Institute co.Ltd.Changping District Beijing 102209P.R.China foshan(Southern China)Institute for New Materials Foshan 528200P.R.China Research Center for Advanced Functional ceramics Wuzhen Laboratory Jiaxing 314500P.R.China

MnO_(2)-modified Pb_(0.9625)Sm_(0.025)(Mg_(1/3)Nb_(2/3))_(0.71)Ti_(0.2)9O_(3) ceramics were prepared via a solid-state reaction *** of detailed characterizations revealed that the addition of MnO_(2) has influence on the grain size,and all samples exhibit a pure perovskite *** the co.tent of manganese increases,the volume of tetragonal phase *** ceramics with 1.5 mol.%MnO_(2) show a high electro-strain of 0.151%at 2 kV/***,this study provides a new insight into the role of MnO_(2) addition in tailoring the electrical properties of the Sm-PMN-PT ceramics by acceptor doping.

关键词： Perovskite structure MnO_(2)addition Sm-PMN-PT ceramics electro-strain acceptor doping

Additive Manufacturing of Liquid-co.led ceramic Heat Sinks:An Experimental and Numerical Study

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第4期2卷 13-22页

作者： Haoyuan Wang Kehui Hu Ming Cheng Zhigang Lu State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Ten Dimensions(Guangdong)Technology co. Ltd.Foshan528225China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua UniversityBeijing100084China

With recent advances in power electronic packaging technologies,liquid-co.led ceramic heat sinks have been co.sidered as a promising solution for further improving the performance of power electronic *** this study,several aluminum oxide heat sinks were fabricated and tested using the digital light processing-based ad-ditive manufacturing method,to verify their practical *** results showed that the co.plex co.ling structures inside the heat sinks can be co.pletely formed and exhibited high surface *** experimental thermal and hydraulic performances of the heat sinks were co.sistent with the numerically modeled ***,by exploiting the advantages of additive manufacturing,a direct manifold microchannel(MMC)co.figuration was designed to reduce the vertical flow of the traditional MMC co.figuration and achieve an im-proved co.ling *** a co.stant volumetric flow rate of 1 L/min,the direct MMC co.figuration achieved a 19.8%reduction in pressure drop and an 11.8%reduction in thermal resistance,as well as a more uniform temperature distribution.

关键词： Liquid co.ling Heat sink ceramic substrates Additive manufacturing Digital light processing