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75th World Foundry Congress, WFC 2024

作者： Feng, Qian Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

Shell-making process is a critical step in investment casting for shape control, and breaking through the "black box" of this process remains a challenging issue in its research. This paper introduces blue light scanning technology into the study of investment casting shell processes, using samples with cantilever beam structures as research objects. It explores the influence of cantilever structure inclination angles on shell wall thickness and deformation. The feasibility and effectiveness of this method are demonstrated through numerical simulation results. This approach achieves visualization and digitalization of the layer-by-layer shell preparation process, providing a new technical pathway for investigating shell formation mechanisms. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Nanocantilevers

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Minimal Sintering Shrinkage Aluminum-Based Ceramic Cores Fabricated by Stereolithography 75

Minimal Sintering Shrinkage Aluminum-Based Ceramic Cores Fab...

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75th World Foundry Congress, WFC 2024

作者： Wang, Haoyuan Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

This study explores the stereolithography-based fabrication of aluminum-based ceramic cores, aimed at minimizing sintering shrinkage. Stereolithography-based ceramic cores often exhibit significant shrinkage during sintering, limiting their applications. In this work, by adding silica and kyanite into the alumina, high mechanical performance while minimizing shrinkage were achieved. Results demonstrate that cores with 22% silica and 8% kyanite show nearly zero shrinkage, making them suitable for complex, high-precision investment casting applications. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Kyanite

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Rectification Effect of 3D-Printed Filters with Deflectors 75

Rectification Effect of 3D-Printed Filters with Deflectors

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75th World Foundry Congress, WFC 2024

作者： Li, Chaoke Wang, Haoyuan Feng, Qian Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

A novel 3D-printed filter with integrated deflectors is proposed to enhance the state of metal liquid outflow. The rectification effect of filters with varying structural sizes was investigated through physical simulations. It was found that filters with smaller structural sizes allow the outflowing liquid to interact more readily under disturbance, promoting fluid convergence, but at the cost of reduced flow rates. With 3D printing, deflectors were integrated into a larger structural-size filter to guide fluid convergence, significantly enhancing the rectification effect and flow stability without reducing the flow rate. The filters proposed in this work allow for the decoupling of rectification and filtration functions, providing greater design flexibility for improving filter strength, filtration efficiency, and other critical performance attributes. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Electric rectifiers

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Hydration Characteristics and Mechanical Properties of Cement-Based materials Modified by Calcined Zeolite and Montmorillonite

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Journal of Renewable materials 2023年第5期11卷 2191-2207页

作者： Lingling Qin Mengya Zhou Jiahao Yan Ping Duan Yingcan Zhu Wei Chen Zuhua Zhang Aiguo Wang Faculty of Materials Science and Chemistry Key Laboratory of Geological Survey and Evaluation of Ministry of EducationChina University of GeosciencesWuhan430074China Key Laboratory of Advanced Building Materials of Anhui Province Anhui Jianzhu UniversityHefei230022China Guangxi Key Laboratory of New Energy and Building Energy Saving Guilin University of TechnologyGuilin541004China Key Laboratory of Road Structure and Materials of Ministry of Transport Chang’an UniversityXi’an710064China Centre for Sustainable Agricultural Systems University of Southern QueenslandToowoombaQLD4350Australia State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China Key Laboratory for Green&Advanced Civil EngineeringMaterials and Application Technology of Hunan Province College of Civil EngineeringHunan UniversityChangsha410082China

Montmorillonite and clinoptilolite zeolite were used as representative materials to prepare calcined clay-cement binary cementitious materials in order to study the effect of calcination treatment on the activation of clay minerals and the activity difference between layered and framed clays in this *** influence of different calcined clay content(2%,4%,6%,8%,10%)on the fluidity,compressive strength,microstructure,phase change,and hydration heat of cement-based materials were *** calcined clay improves the fluidity of cement-based materials as compared with the uncalcined *** addition of calcined montmorillonite(CMT)improves the development of mechanical strength,and the optimal compressive strength reaches 85 MPa at 28 days with 8%***,the activity of calcined clinoptilolite zeolite(CZL)is weak with few reaction sites,which slightly reduced the mechanical strength as compared to the blank *** addition of CMT changes the microscopic morphology of hydration products such as C-S-H and C-A-H,leading to the formation and transformation of ettringite in the early *** promotes the gradual polymerization of Si-O bonds into Si-O-Si bonds simultaneously,which accelerates the early hydration ***,CZL acts mainly as a filling function in the cementitious *** brief,CMT as an admixture can improve the mechanical properties of cement,but CZL has little *** work provides a guideline for the applications of calcined clay in cement,considering the influence of clay type on workability and mechanical strength.

关键词： Calcined clay cement montmorillonite clinoptilolite zeolite mechanical strength hydration

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Enhancing energy density of poly(vinylidene fluoride) composite film via addition of N-doped carbon modified boron nitride and sandwich-structural engineering

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Applied Surface Science 2023年第1期640卷

作者： Huang, Huabo Mei, Wentao Wang, Yucong Huang, Juan Li, Liang Ji, Jiayou Xiong, Chuanxi Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Key Laboratory for Green Chemical Process of Ministry of Education School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China Key Laboratory of Green Processing and Functional New Textile Materials of Ministry of Education School of Textile Science and Engineering Wuhan Textile University Wuhan430200 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

It is a challenge to simultaneously enhance dielectric constant and breakdown strength of dielectrics and achieve a greatly elevated energy density. Herein, polyaniline was first coated onto the surface of boron nitride nanosheets (BN), and then nitrogen-doped carbon (NC) was formed through a carburization process, resulting in BN@NC composite, which was subsequently added to poly(vinylidene fluoride) (PVDF) to prepare a composite film with high dielectric performance. The characterization showed that BN@NC effectively preserved the nanosheet structure of BN and formed strong hydrogen bonding interactions with the PVDF matrix, promoting the β-PVDF formation. This not only improved the compatibility but also enhanced the interfacial polarization between conductive NC and the polymer, leading to a high dielectric constant. Moreover, the electrically insulating BN prevented the formation of leakage current, resulting in a high breakdown strength. Finally, a sandwich-structured film was constructed, and exhibited a dielectric constant of 10.2 (at 1 kHz), a breakdown strength of 380 MV m−1, and an energy density of 6.1 J cm−3, which were 20%, 36%, and 74% higher, respectively, than those of pure PVDF film (8.5, 280 MV m−1, and 3.5 J cm−3). This work highlights significant potential for applications in low-cost and high-energy density dielectric composites. © 2023 Elsevier B.V.

关键词： Boron nitride

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Recent advances for liquid metals:Synthesis,modification and bio-applications

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Journal of materials Science & technology 2023年第12期143卷 153-168页

作者： Zhenhu Guo Xiaohan Gao Jingsong Lu Wanling Xu Jielin Ye Ying Li Wensheng Xie Lingyun Zhao Key Laboratory of Advanced Materials Ministry of Education of ChinaSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Medicine Tsinghua UniversityBeijing 100084China Department of Neurosurgery Yuquan HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 100084China The Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China

Considering the application requirements for modern biomedicine,research into novel biomaterials with unusual functions is highly *** an alternative,liquid metals(LMs),a nontraditional family of metal materials,have piqued the interest of biomedical researchers and made significant advances in biomed-ical areas,owing to their shape transformability,self-healing capability,excellent electrical,and thermal *** particular,many functionalized strategies for the preparation and modification of LMs or LMs-based composites to achieve extended biomedical applications have been investigated in recent *** findings provided inspiring while constructive reference for the fabrication and engineering of novel LMs-based ***,in this topic review,we elaborate on the recent advances of LMs-based functional materials,with particular focuses on the synthesis,modification,and bio-applications,especially in antitumor therapy,antibacterial,contrast agent for imaging,bone repair,electronic skin sen-sor,and nerve connection *** on,the current challenges and future prospects of LMs-based composites are carefully discussed.

关键词： Liquid metals Synthesis Composites Antitumor therapy Bio-application

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Structural regulation of single-atomic site catalysts for enhanced electrocatalytic CO_(2)reduction

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Nano Research 2022年第6期15卷 4925-4941页

作者： Minmin Wang Min Li Yunqi Liu Chao Zhang Yuan Pan State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580China MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

Electrocatalytic CO_(2)reduction reaction(CO_(2)RR)is considered an efficient way to convert CO_(2)into high-value-added chemicals,and thus is of significant social and economic *** single-atomic site catalysts(SASCs)generally have excellent selectivity because of their 100%atomic utilization and uniform structure of active sites,and thus promise a broad range of ***,SASCs still face challenges such as low intrinsic activity and low density of active *** regulation of the microstructures of SASCs is an effective method to improve their CO_(2)RR performance and to obtain deep reduction *** this article,we systematically summarize the current research status of SASCs developed for highly efficient catalysis of CO_(2)RR,discuss the various structural regulation methods for enhanced activity and selectivity of SASCs for CO_(2)RR,and review the application of in-situ characterization technologies in the SASC-catalyzed CO_(2)*** then discuss the problems yet to be solved in this area,and propose the future directions of the research on the design and application of SASCs for CO_(2)RR.

关键词： Electrocatalysis single-atomic site catalyst structure regulation active site carbon dioxide reduction reaction

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Ternary layered boride MoAlB:A novel thermo-regulation microwave absorbing ceramic material

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Journal of advanced Ceramics 2024年第5期13卷 699-710页

作者： Zhangjue Wang Fan Zhang Nannan Wang Wei Li Yongqiang Chen Hailong Wang Rui Zhang Yanqiu Zhu Bingbing Fan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Academy of Sciences Zhengzhou 450046China State Key Laboratory of Featured Metal Materials and Life Cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Department of Engineering Faculty of EnvironmentScience and EconomyUniversity of ExeterExeter EX44QFUK

In the context of the fifth-generation(5G)smart era,the demand for electromagnetic wave(EMW)-absorbing materials has become increasingly prominent,so it is necessary to explore promising candidate *** work focuses on the exploration of the material absorbing properties of a MoAlB MAB(MAB represents a promising group of alternatives,where M stands for a transition metal,A typically denotes Al,and B is boron)phase ***,the first-principles calculations were performed to reveal the unique crystal and layered structure of the MoAlB ceramics and to predict their potential for use as an EMW absorption ***,a series of MoAlB ceramics were synthesized at temperatures ranging from 800 to 1300℃,and the influence of temperature on the phase compositions and microstructures of the obtained MoAlB ceramics was characterized and ***,the practical EMW absorption performance of the prepared MoAlB ceramics was evaluated via a combination of experiments and radar cross-sectional *** MoAlB sample synthesized at 900℃ exhibits superior EMW absorption performance,achieving an impressive minimum reflection loss(RL)of−50.33 *** unique layered structure and good electrical conductivity of the MoAlB samples are the main reasons for their enhanced wave absorption performance,which provides interfacial polarization and multiple dielectric loss ***,this study not only contributes to the understanding of the preparation of MoAlB materials but also provides potential guidance for their utilization in the realm of electromagnetic wave absorption.

关键词： MoAlB electronic band structure electromagnetic wave(EMW)absorption layered ternary boride density of states

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Control over the aggregated structure of donor–acceptor conjugated polymerfilms for high-mobility organicfield-effect transistors

Aggregate

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Aggregate 2024年第3期5卷 26-49页

作者： Xinxiu Cao Yanchun Han Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion School of Materials Science and EngineeringHunan University of Science and TechnologyXiangtanP.R.China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunP.R.China University of Science and Technology of China HefeiP.R.China

Donor–acceptor(D-A)conjugated polymers have demonstrated great potential in organicfield-effect transistors application,and their aggregated structure is a crucial factor for high charge ***,the aggregated structure of D-A conjugated polymerfilms is complex and the structure–property relationship is difficult to *** review provides an overview of recent progress in controlling the aggregated structure of D-A conjugated polymerfilms for higher mobility,including the mechanisms,methods,and *** discuss the multilevel microstructures of D-A conjugated polymerfilms,and then summarize the current understanding of the relationship betweenfilm microstructures and charge transport ***,we review the theory of D-A conjugated polymer *** that,we summarize the common methods to control the aggregated structure of semi-crystalline and near-amorphous D-A conjugated polymerfilms,such as crystallites and aggregates,tie chains,film alignment,and attempt to understand them from the basic theory of polymer ***,we provide the current challenges in controlling the aggregated structure of D-A conjugated polymerfilms and in understanding the structure–property relationship.

关键词： aggregated structure charge mobility crystallization D-A conjugated polymers near-amorphous organicfield-effect transistors

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Hierarchical Structured Fabrics with Enhanced Pressure Sensing Performance Based on Orientated Growth of Functional Bacterial Cellulose

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advanced Fiber materials 2024年第5期6卷 1554-1568页

作者： Chong Gao Yingcun Liu Zongxue Gu Juan Li Yue Sun Wei Li Keshuai Liu Duo Xu Bin Yu Weilin Xu College of Textile Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123People’s Republic of China

Wearable electronics based on natural biomaterials,such as bacterial cellulose(BC),have shown promise for a variety of healthcare and human-computer interaction ***,current BC-based pressure sensors have an inherent limi-tation,which is the two-dimensional rigid structures and limited compressibility of BC restrict the sensitivity and working range for pressure ***,we propose a strategy for fabricating BC/polypyrrole/spacer fabric(BPSF)pressure sensors with a hierarchical structure constructed by integrating conductive BC nanonetwork into a compressible fabric frame via the in situ biofermentation *** hierarchical structure design includes a cross-scale network from the nanoscale BC sensor networks to the macroscopic three-dimensional compressible fabric sensor network,which significantly improves the working range(0-300 kPa)and sensitivity(40.62 kPa-1)of *** this unique structural design,the sensor also achieves a high fatigue life(~5000 cycles),wearability,and reproducibility even after several washing and abrasion ***,a flexible and wearable electronic textile featuring an n×n sensing matrix was developed by constructing BPSF arrays,allowing for the precise control of machines and weight distribution *** empirical insights are valuable for the biofabrication and textile structure design of wearable devices toward the realization of highly intuitive human-machine interfaces.

关键词： Bacterial cellulose textile In situ biofermentation Hierarchical structure Pressure sensing

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