查看更多>>摘要：China derives its name from its rich legacy of traditional ceramic arts,which has inspired generations of peo-ple in China and beyond to improve their ceramic processing skills.The review categorises the various ceramic additive manufacturing techniques developed in China into dot-by-dot,line-by-line,and area-by-area additive manufacturing techniques,according to their corresponding dimensional printing strategies.These techniques are categorised according to ISO standards,with an overview of representative achievements by Chinese re-search groups for each method.The review also summarises and compares materials,printing parameters,and product properties in those studies,highlighting differences in printing speeds among different printing strate-gies.In addition,milestones in contemporary ceramic four-dimensional(4D)printing are illustrated in terms of the new material(4D printing elastomer-derived ceramics),new process(4D additive-subtractive manufacturing of ceramics),and new function(4D printing shape memory ceramics).Finally,the prospects for ceramic printing and its applications are discussed.
查看更多>>摘要：Three-dimensional(3D)bioprinting,which has been applied in tissue engineering and regenerative medicine,uses biomaterials,cells,and other essential components to manufacture organs and tissues with specific biolog-ical functions and complex structures.Over the past 30 years,researchers have developed new 3D bioprinting technologies with improved manufacturing capabilities and expanded applications.Chinese research teams con-tributed significantly to this process.In this paper,we first reviewed the development history and major mile-stones in 3D bioprinting,categorizing them into two main strategies:"biomaterial-based indirect assembly"and"living cell-based direct assembly".This review further delved into the technical principles,recent advancements,advantages,disadvantages,and applications of each type of bioprinting technology.Finally,the challenges and future directions of 3D bioprinting were summarized to guide future research in China and foster advancements in this dynamic field.
查看更多>>摘要：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 medicine.Since the 1980s,the orthopedic team led by Prof.Kerong 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 collaboration.This work laid the foundation for the application of domestic 3D-printing in orthopedics.Continuous 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 technology.It has promoted personalized medicine,enhanced surgical precision,minimized the risk of infection,and accelerated bone integration.Prof.Yongqiang Hao's group has further expanded and deepened the application of three-dimensional printing technology in orthopedics.Significant breakthroughs have been achieved in domestic bioactive metals,metal orthopedic implants,and 3D-printed biological implants.The protocols for personalized internal fixation and novel pelvic reconstruction prostheses are now internationally recognized in clinical practice.This study provides a comprehensive overview of the innovative research and applications of personalized and customized 3D-printed orthopedic implants.
查看更多>>摘要：Laser additive manufacturing(LAM)technology can overcome the limitations of conventional manufacturing and facilitate the integrated design and production of geometrically complex metal parts,making it widely applica-ble in industrial sectors such as biomedical,aerospace,and molding.This review provides an overview of the frontiers of LAM techniques,focusing on the progress made by our research group over the past two decades.It begins with the introduction of four critical types of advanced LAM techniques:large-scale,multimaterial,field-assisted,and LAM/subtractive hybrid manufacturing.Subsequently,coaxial and off-axial in situ monitor-ing techniques based on sensor installation are presented,along with an exploration of their integration with high-speed cameras,photodiodes,and other photoelectric sensors within the LAM equipment.Representative innovative designs incorporating small-angle and support-free structures,nonassembled structures,and porous structures are then introduced.Finally,a comprehensive summary is provided,along with a discussion of the development trends of LAM from both manufacturing and design perspectives.
查看更多>>摘要：Additive manufacturing(AM),recognized as a pivotal innovation,has revolutionized the manufacturing industry since its inception.With a robust background of over three decades in AM,China has accomplished significant milestones,emerging as a key global player in the deployment and export of related machinery and products.China's prominence within the realm of powder bed fusion technology is underscored by its substantial market share.Electron beam powder bed fusion(EB-PBF),known for its low residual stress and high forming efficiency,has gained considerable international interest.Since Tsinghua University initiated the first research on EB-PBF in 2004,China has steadily advanced in this area,leading to the commercialization of EB-PBF devices and the development of a diverse product line.This comprehensive review highlights the research progress in EB-PBF,focusing on its development in China,explores novel technologies,and offers insights into future advancements.
查看更多>>摘要：Biofabrication,also known as bioprinting,has been widely used in the field of biomedicine.The three most important factors in biofabrication are 3D bioprinter,biomaterials to be printed(bioinks),and the printing object(application).This review provides a detailed introduction to the latest research progress in these aspects.In particularly,the bioinks for bioprinting require strict biocompatible requirements.Four typical materials,i.e.metal/alloys,ceramics,polymers,and their composites,were introduced in detail,and their printing process and application scenarios were summarized,respectively.There are many applications of biofabrication in clinical practice.The application of biofabrication in skeletal system,skin and soft tissue,cardiovascular system,digestive system,respiratory system,urinary system,nervous system,plastic surgery and medical aesthetics were briefly introduced.The applications of biofabrication has a wide range of clinical need.Biofabrication is an innovative technology that is expected to further promote the clinical precision treatments.
查看更多>>摘要：Wire-arc directed energy deposition(WA-DED)has emerged as a transformative technology for producing large-scale metal components owing to its capacity for cost-effective fabrication and suitable deposition rates.Recently,the focus has shifted to the WA-DED of magnesium alloys,which are promising lightweight structural materials in the aerospace transportation and military industries.This article systematically reviews recent advancements in magnesium alloys fabricated using WA-DED.It discusses aspects such as forming quality,internal defects,microstructural evolution,and mechanical properties.Prevalent internal defects such as pores and cracks in WA-DED magnesium alloys are identified and characterized.Additionally,strategies for enhancing the manufacturing quality are elucidated.Furthermore,this article comprehensively explores the underlying mechanisms of the in-terplay among process parameters,internal defects,and microstructural heterogeneity.The main objective is to provide insights into and strategies for defect elimination,microstructural homogenization,and property en-hancement.Finally,some perspectives are proposed for further progress in the application of WA-DED magnesium alloy components for superior performance.
查看更多>>摘要：Additive manufacturing(AM)is a reliable technique for constructing highly complex metallic parts.Direct energy deposition(DED)is one of the most common technologies used for AM-printed metal alloys.However,issues such as weak binding,poor accuracy,and rough surfaces still affect the final products.These limitations in the metal-feed DED process indicate that post-processing techniques are required to achieve high quality in terms of both mechanical properties and surface finish.Conventional contact-based post-processing methods have several drawbacks,including difficulties in accessing complex shapes,environmental impact,high time consumption and cost,and health risks for operators.To address these problems and improve surface quality,a laser polishing process has been proposed.By melting or ablating the material with a laser,the laser-polishing process enables the smoothing of the initial topography.It should be noted that there are currently no reviews focusing specifically on laser polishing as a surface treatment technology for the DED process.Therefore,this review presents a unique examination of the mechanisms and primary user-set parameters for both continuous wave(CW)and pulsed laser polishing.The objective is to demonstrate the capabilities of each process and the benefits of using them for the surfaces of DED metal parts.Additionally,existing knowledge and technology gaps are identified,and future research directions are discussed.
查看更多>>摘要：This review provides a comprehensive overview of the various three-dimensional printing techniques for area ex-posure additive manufacturing using the patterned control of optical devices.Additive manufacturing techniques can be broadly categorized into low-power exposure and high-power melting,both of which involve innova-tive patterning and light-sourcing methods.The working principles and accompanying auxiliary devices of core technologies including the digital micromirror device,liquid crystal display,liquid crystal on silicon mask,and optically addressable light valve are summarized.The discussed techniques and devices have played critical roles in advancing both vat photopolymerization and powder bed fusion additive manufacturing processes and can be applied to markedly enhance printing efficiency.The advances discussed in this review hold significant promise in fields such as biomedicine,robotics,and sensing.The associated challenges and opportunities faced by the considered techniques and devices are summarized accordingly.
NETL
NSTL
万方数据