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The Applications and Latest Progress of Ceramic 3d printing

Additive Manufacturing Frontiers 2024年第1期3卷 33-56页

作者： Qun diao Yong Zeng Jimin Chen Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing University of TechnologyBeijing100124China Key Laboratory of Trans-scale Laser Manufacturing Technology Ministry of EducationBeijing University of TechnologyBeijing100124China

In recent years,there has been significant growth in the demand from both domestic and international markets for ceramic 3d printing *** surge in interest has led to rapid advancements in research and *** 3d printing has been applied successfully in diverse fields,including healthcare,cultural creativity,and architectural *** appeal lies in eliminating the need for molds during manufacturing,resulting in cost-effectiveness,high production efficiency,and unparalleled freedom in structural *** to traditional ceramic molding processes,various industries have widely embraced the advantages of ceramic 3d *** current focus of researchers lies in strategic emerging fields,such as healthcare,aerospace,and elec-tronic *** conduct multifaceted research on ceramic 3d printing technology in these areas and are eager to invest in industrial *** article overviews the latest research and application progress in ceramic 3d printing technology in the fields *** addition,it analyzes the challenges and tech-nical bottlenecks faced by ceramic 3d printing technology in different ***,this study explores the opportunities and demands for further development in materials research and development,equipment man-ufacturing,and application field *** examining these aspects,this study sheds light on the immense potential that ceramic 3d printing holds for future growth and innovation.

关键词： Additive manufacture 3d printing Ceramics research aspects Applications

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A Study on Minimizing Heat Accumulation by Supports of Non-uniform Cross Sections Using Macro Heat Transfer Analysis in PBF Additive Manufacturing

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Transactions of the Korean Institute of Electrical Engineers 2024年第2期73卷 412-418页

作者： Yun, Seok-Chul Shin, Jaeho Kim, Jae-Woong Choi, Kyunsuk Dept. of Industry-University Convergence Hanbat National University Korea Republic of Dept. 3D printing industry-universitycooperation foundation Hanbat National University Korea Republic of Intelligence Integrated SW Research Center Korea Electronics Technology Institute Korea Republic of The School of Mechanical Eng. Yeungnam University Korea Republic of

In this study, a numerical analysis model was developed for temperature distribution history analysis. To verify the numerical model, the temperature accumulation results analyzed through simulation were compared with the temperature accumulation results for each layer measured with an IR camera. Through temperature distribution history analysis using the commercial program vAMfire/Macro, the maximum height at which the maximum temperature is reached in each process according to the change in cross-sectional area was predicted. In addition, the temperature distribution history for each support was analyzed considering general support, wall support, and modified wall support to minimize heat dissipation and heat accumulation. The difference in heat dissipation effect depending on the type of support was quantitatively analyzed. By applying optimal support, we were able to solve the stacking problem caused by heat accumulation. Through heat transfer analysis, it was confirmed that quantitative analysis was possible to solve problems such as lamination failure and thermal deformation. © 2024 Korean Institute of Electrical Engineers. All rights reserved.

关键词： Temperature distribution

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An online customization platform for headphones based on additive manufacturing 3

An online customization platform for headphones based on add...

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3rd International Conference on Advanced Manufacturing technology and Manufacturing Systems, ICAMTMS 2024

作者： Xie, Liangjie Wang, Xubao Faculty of Materials and Manufacturing Beijing University of Technology Beijing China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing China Key Laboratory of Trans-scale Laser Manufacturing Technology Ministry of Education Beijing China

ISBN: (纸本)9781510681804

This article proposes a customized online production platform for headphones to solve the problems of discomfort and easy dropping caused by consumers wearing headphones in large quantities using traditional methods. Reverse modeling technology is used to obtain the scanning data of the ear nail cavity, and based on this, the ear machine online customization platform is used to achieve personalized customization of the headphones, and ultimately 3d printing technology is used to complete the production of the headphones. Use Python for secondary development on Geomagic Wrap, and combine it with SceneBuilder to draw a platform page to obtain a user-operable headphone customization platform. Customized headphone production mainly includes three parts: ear nail cavity scanning, parameterized platform modeling, and headphone printing. Using a 3d scanner Artec Space Spider scans the external ear to obtain 3d data of the ear cavity, model repair is performed on a customized platform, and customized earphone models are quickly generated. After conducting finite element simulation analysis on the ear earphone model, we studied the contact pressure between the earphone and the auricle and optimized the earphone parameters. We objectively evaluate the comfort of headphones based on the uniformity of pressure distribution and use this indicator as the goal of simulation optimization. © 2024 SPIE.

关键词： Earphones

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Prediction and Analysis of Post-Treatment of Sustainable Walnut Shell/Co-PES Parts by Laser Sintering

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Journal of Renewable materials 2021年第2期9卷 351-364页

作者： Yueqiang Yu Suling Wang Minzheng Jiang Yanling Guo Ting Jiang Northeast Petroleum University College of Mechanical Science and EngineeringDaqing163318China Northeast Forestry University College of Mechanical and Electrical EngineeringHarbin150040China Northeast Forestry University Research and Development Center of 3D Printing Material and TechnologyHarbin150040China

In order to enhance the strength of sustainable walnut shell/Co-PES(WSPC)sintered parts,wax-filtrated posttreatment was carried *** effects of treating fluid temperature,preheating time and immersion time on the bending strength of WSPC wax-filtrated parts were analyzed by single factor analysis *** obtain an accurate model for predicting the bending strength of the WSPC wax-filtrated part,the experiments were involved by using Box-Behnken design(BBd).Main parameters,such as treating fluid temperature,preheating time and immersion time,and their interactive effects were analyzed through analysis of variance(ANOVA)and graphical *** results demonstrated that all parameters’direct effects were significant to bending strength of the WSPC wax-filtrated *** optimum value was 5.0 MPa when the treating fluid temperature of 70°C,preheating time of 50 min,and immersion time of 20 *** predicted models effectively validated had good predicting *** WSPC wax-filtrated part using optimal processing parameters was processed by investment casting,and then the metal casting of dimensional stability and smooth surface was *** casting was done using WSPC wax-filtrated parts under optimal process parameters and then metal parts with stable structure size and smooth surface can be obtained,which indicates that WSPC material can be used for investment casting.

关键词： Agricultural and forestry wastes three-dimensional printing selective laser sintering post processing response surface methodology

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Performance Improvement of Additively Manufactured Complex Configuration of Polyamide 12

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Additive Manufacturing Frontiers 2024年第4期3卷 178-190页

作者： Yandong Zhao Meng Li Jimin Chen Yong Zeng Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China National Key Laboratory of Human Factors Engineering China Astronaut Research and Training CenterBeijing100094China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing100124China Key Laboratory of Trans-scale Laser Manufacturing Technology Ministry of EducationBeijing100124China

In this study,to improve the unsatisfactory mechanical properties of polyamide-12 materials formed via selective laser sintering,an independent soaking and rapid cooling device is developed to improve the internal microstructural defects of the materials via *** maximum tensile strength of the material after heat treatment is 57.3±0.5 MPa at the optimum ***,its elongation at break is 293%-297% and 22%-25% at -80℃ and+80℃,***+80℃,its fracture strength and elongation at break are 53.5±3.2 MPa and 539%-582%,*** heat treatment,its maximum bearing capacity of the triply periodic minimal surface(TPMS)in the elastic stage increased significantly by 106%-119%.Among them,the d-type TPMS after heat treatment shows the best comprehensive bearing capacity;the maximum bearing capacity in the elastic stage is 7.2 kN,which is accompanied by favorable thermal *** lower-surface temperatures of+80℃ and-80℃,the equivalent thermal conductivities are 0.02975 and 0.01592 W/(m·K),respectively.

关键词： 3d printing,PA12 Heat treatment Mechanical properties TPMS

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Recent research of peptide-based hydrogel in nervous regeneration

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Bioactive materials 2024年第10期40卷 503-523页

作者： Chunmei Xie Yueyang Chen Lang Wang Kin Liao Bin Xue Yulong Han Lan Li Qing Jiang State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China Advanced Digital and Additive Manufacturing Center Khalifa University of Science and TechnologyPo Box 127788Abu DhabiUnited Arab Emirates National Laboratory of Solid State Microstructures Department of PhysicsNanjing UniversityNanjingChina State Key Laboratory of Pharmaceutical Biotechnology Division of Sports Medicine and Adult Reconstructive SurgeryDepartment of Orthopedic SurgeryDrum Tower Hospital Affiliated to Medical School of Nanjing UniversityNanjingChina Jiangsu Engineering Research Center for 3D Bioprinting NanjingChina Institute of Medical 3D Printing Nanjing UniversityNanjingChina

Neurological disorders exert significantly affect the quality of life for patients,necessitating effective strategies for nerve *** traditional autologous nerve transplantation and emerging therapeutic approaches encounter scientific challenges due to the complex nature of the nervous system and the unsuitability of the surrounding environment for cell *** engineering techniques offer a promising path for *** neural tissue engineering relies on modulating cell differentiation behavior and tissue repair by developing biomaterials that mimic the natural extracellular matrix(ECM)and establish a threedimensional ***-based hydrogels have emerged as a potent option among these biomaterials due to their ability to replicate the structure and complexity of the *** review aims to explore the diverse range of peptide-based hydrogels used in nerve regeneration with a specific focus on dipeptide hydrogels,tripeptide hydrogels,oligopeptide hydrogels,multidomain peptides(MdPs),and amphiphilic peptide hydrogels(PAs).Peptide-based hydrogels offer numerous advantages,including biocompatibility,structural diversity,adjustable mechanical properties,and degradation without adverse ***,hydrogels formed from self-assembled polypeptide nanofibers,derived from amino acids,show promising potential in engineering neural tissues,outperforming conventional materials like alginate,poly(ε-caprolactone),and ***,the simple design and cost-effectiveness of dipeptidebased hydrogels have enabled the creation of various functional supramolecular structures,with significant implications for nervous system *** hydrogels are expected to play a crucial role in future neural tissue engineering *** review aims to highlight the benefits and potential applications of peptidebased hydrogels,contributing to the advancement of neural tissue engineering.

关键词： Self-assembled dipeptide Cyclic dipeptide Hydrogels Nervous regeneration

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Heat treatment effects on the metastable microstructure,mechanical property and corrosion behavior of Al-added CoCrFeMnNi alloys fabricated by laser powder bed fusion

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Journal of materials Science & technology 2023年第7期138卷 171-182页

作者： decheng Kong Li Wang Guoliang Zhu Yiqi Zhou Xiaoqing Ni Jia Song Liang Zhang Wenheng Wu Wei Wu Cheng Man da Shu Baode Sun Chaofang dong Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

With the development of aerospace and transportation,high-strength structural materials manufactured by additive manufacturing techniques get more attention,which allows the production of counterparts with complex *** work investigates Al-added CoCrFeMnNi high-entropy alloys(Al-HEAs)pre-pared by laser powder bed fusion(PBF-LB),adding 4.4 wt.%Al reducing approximately 7%*** contribution of post-heat-treatment to microstructure,mechanical properties,and corrosion behaviors are *** cracking along with grain boundaries in the as-built PBF-LB Al-HEAs is determined,which comes from the residual liquid film as a larger solidification temperature range by adding *** PBF-LB Al-HEAs mainly consist of a face-centered cubic(FCC)matrix with Al/Ni/Mn decorated dislocation cells therein and a minor body-centered cubic(BCC)*** 850℃ annealing treatment,massive BCC phases(ordered NiAl and disordered Cr-rich precipitates)generate at the dislocation cell/grain bound-aries and the dislocation cells are still ***,the volume fraction of BCC phases and the dislocation cells vanish after 1150℃ solution *** a result,Al-HEA850 shows an over 1000 MPa yield strength with nearly no ductility(<3%);the Al-HEA1150 exhibits considerable strength-ductility ***,the Al-HEA850 demonstrates the worst pitting corrosion resistance due to the preferential dissolution of the NiAl precipitates in chloride-containing *** comparatively de-liberating the evolution of strength-ductility and localized corrosion,we built a framework about the effects of the heat treatment on the mechanical property and degradation behavior in additively manu-factured Al-added high-strength HEAs.

关键词： High entropy alloy Laser powder bed fusion Heat treatment dislocation cell Mechanical property Corrosion behavior

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Additive Manufacturing technology Lends Wings to Orthopedic Clinical Treatment-The Innovative development of Medical Additive Manufacturing in Shanghai Ninth People’s Hospital

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Additive Manufacturing Frontiers 2024年第4期3卷 44-56页

作者： Wei Yang Shasha Liu Liang deng dinghao Luo Zhaoyang Ran Tinglong Chen Lei Wang Kai Xie Junxiang Wu Wenbo Jiang Ping Liu Jingke Fu Yongqiang Hao Kerong dai Shanghai Engineering Research Center of Innovative Orthopaedic Instruments and Personalized Medicine Clinical and Translational Research Center for 3D Printing TechnologyShanghai200011China The Base of Achievement Transformation Shidong Hospital Affiliated to University of Shanghai for Science and TechnologyShanghai200443China Shanghai Key Laboratory of Orthopaedic Implant Department of Orthopaedic SurgeryShanghai Ninth People’s Hospital Shanghai Jiao Tong University School of MedicineShanghai200011China

3d-printing technology,a leading example of advanced additive manufacturing,has revolutionized the treatment of clinical orthopedic diseases,ushering in a new era of personalized *** the 1980s,the orthopedic team led by *** dai at Shanghai Ninth People’s Hospital,affiliated with Shanghai Jiao Tong University School of Medicine,has effectively advanced the research,development,and implementation of customized artificial joints through medical *** work laid the foundation for the application of domestic 3d-printing in *** innovations-from fundamental research to clinical practice,from metal prosthesis implantation to customized bioactive bone product replacement,and from the traditional standardized diagnostic and treatment paradigm to the transformation of personalized medical models-underscore the pivotal role of 3d-printing *** has promoted personalized medicine,enhanced surgical precision,minimized the risk of infection,and accelerated bone *** Hao’s group has further expanded and deepened the application of three-dimensional printing technology in *** breakthroughs have been achieved in domestic bioactive metals,metal orthopedic implants,and 3d-printed biological *** protocols for personalized internal fixation and novel pelvic reconstruction prostheses are now internationally recognized in clinical *** study provides a comprehensive overview of the innovative research and applications of personalized and customized 3d-printed orthopedic implants.

关键词： Additive manufacturing 3d bioprinting Alloys Implants Personalization Clinical transformation

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In-situ observation of asymmetrical deformation around inclusion in a heterogeneous additively manufactured 316L stainless steel

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Journal of materials Science & technology 2021年第30期89卷 133-140页

作者： decheng Kong Chaofang dong Xiaoqing Ni Zhang Liang Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA02139USA Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai200437China

Oxide inclusions widely exist in additively manufactured components due to the native oxide layer on the powder surface,together with gas impurities during the printing *** in-situ tensile tests combined with electron backscatter diffraction(EBSd)and electron channeling contrast imaging(ECCI)techniques,we propose an asymmetrical cracking mechanism around the oxide inclusions in a selective laser melted 316L stainless *** heterogeneous sub-micro cellular structures lead to different twinning tendencies around the inclusions due to the size-related critical twinning stresses,and the deformation-induced nano-twin clusters can resist the cracking propagation,therefore resulting in the asymmetrical cracking behaviors around the inclusions.

关键词： Selective laser melting 316L stainless steel Oxide inclusion Asymmetrical crack Cellular structure

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Manufacturing Accuracy Improvement of Concrete Product by Hybrid Additive and Subtractive Method Based on the Time-dependent Characteristics of Cementitious materials

SSRN

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SSRN 2024年

作者： Wang, Li Lin, Wenyu Wan, Qian Li, Zhijian Bai, Gang School of Civil and Transportation Engineering Hebei University of Technology Tianjin300401 China Engineering Research Center on Construction 3D Printing of Hebei Tianjin300401 China

Cementitious materials used in 3d printing exhibit significant time-dependent characteristics in terms of early-age rheology and stiffness development that limit high-quality manufacturing. Meanwhile, the centimeter-level printing accuracy of 3dPC makes it difficult to meet actual engineering requirements. To address the above challenges, this paper develops the hybrid additive and subtractive methods to improve manufacturing accuracy for concrete products. The printed components undergo cutting/grinding subtractive treatment until the actual dimensions match the design dimensions within acceptable tolerances. The processing error of the methods was quantitatively analyzed using 3d laser scanning technology, and the effectiveness was validated through various case studies. The results indicate that manufacturing mismatch can be controlled within a range of 2 mm, and the surface roughness of the components can be reduced from 8.5 mm to 0.5 mm, resulting in a 94.12% increase. The practice proves that the proposed methods can achieve high-precision construction of various free-form structures. © 2024, The Authors. All rights reserved.

关键词： Additives

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