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Quantitative characterization of defects in stereolithographic additive manufactured ceramic using X-ray computed tomography

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Journal of Materials Science & Technology 2022年第23期118卷 153-166页

作者： Keqiang Zhang Qiaoyu Meng Xueqin Zhang Zhaoliang Qu rujie he Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081Chin

Ceramics have been widely fabricated by additive manufacturing(AM).Compared to conventional technologies,the strength of additive manufactured ceramic is relatively low owing to the formation of defects during manufacturing *** defects have significant effects on the microstructure and mechanical properties of additive manufactured ***,systematic research on defects,including defect geometrical features,quantitative statistics,and formation mechanism,as well as the intrinsic relationship with mechanical properties,need to be studied in *** this work,Al2 O3 ceramics were prepared from photosensitive slurries with different solid loadings by using stereolithographic(SL)additive *** defects,including their sizes and distributions,in both green and sintered bodies were investigated by using scanning electron microscopy(SEM)and X-ray computed tomography(X-CT).Geometrical features and quantitative statistics of the defects were evaluated and discussed to reveal their formation ***,the intrinsic relationship between defects and mechanical properties of the additive manufactured ceramic was *** study can give some fundamental understanding of the defects in additive manufactured ceramics.

关键词： Ceramic Stereolithographic additive manufacturing Defects X-CT Strength

Mechanical properties of additively-manufactured cellular ceramic structures:A comprehensive study

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Journal of Advanced Ceramics 2022年第12期11卷 1918-1931页

作者： Xueqin ZHANG Keqiang ZHANG Bin ZHANG Ying LI rujie he Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China School of Naval Architecture Ocean and Energy Power EngineeringWuhan University of TechnologyWuhan 430070China

Cellular ceramic structures(CCSs)are promising candidates for structural components in aerospace and modern industry because of their extraordinary physical and chemical ***,the CCSs with different structural parameters,i.e.,relative density,layer,size of unit cells,and structural configuration,were designed and prepared by digital light processing(DLP)-based additive manufacturing(AM)technology to investigate their responses under compressive loading *** was demonstrated that as the relative density increased and the size of the unit cells decreased,the mechanical properties of one-layer CCSs *** mechanical properties of three-layer CCSs were more outstanding than those of the CCSs with one and two *** addition,structural configurations also played a vital role in the mechanical properties of the ***,the mechanical properties of the CCSs from superior to inferior were that with the structural configurations of modified body-centered cubic(MBCC),Octet,SchwarzP,IWP,and body-centered cubic(BCC).Furthermore,structural parameters also had significant impacts on the failure mode of the CCSs under compressive *** the relative density increased,the failure mode of the one-layer CCSs changed from parallel-vertical-inclined mode to parallel-vertical *** was worth noting that the size of the unit cells did not alter the failure *** fracture took a greater proportion in the failure mode of the multi-layer *** it could be suppressed by the increased relative ***,the proportions of the parallel-vertical mode and the fracture along a specific plane always changed with the variation of the structural *** study will serve as the base for investigating the mechanical properties of the CCSs.

关键词： cellular ceramic structures(CCSs) mechanical properties failure mode structural parameters

Additive manufacturing of hydroxyapatite bioceramic scaffolds: Dispersion, digital light processing, sintering, mechanical properties, and biocompatibility

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Journal of Advanced Ceramics 2020年第3期9卷 360-373页

作者： Chengwei FENG Keqiang ZHANG rujie he Guojiao DING Min XIA Xinxin JIN Chen XIE Instiute of Advanced Structure Technology Bejing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBejing 100081China School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150040China Shanghai Aircrafi Manufacturing Co. LtdShanghai 201324China

Hydroxyapatite(HA)bioceramic scaffolds were fabricated by using digital light processing(DLP)based additive *** issues on the HA bioceramic scaffolds,including dispersion,DLP fabrication,sintering,mechanical properties,and biocompatibility were discussed in ***,the ffects of dispersant dosage,solid loading,and sintering temperature were *** optimal dispersant dosage,solid loading,and sintering temperature were 2wt%,50vol%,and 1250℃,***,the mechanical properties and biocompatibility of the HA bioceramic scaffolds were *** DLP-prepared porous HA bioceramic scaffold was found to exhibit excellent mechanical properties and degradation *** this study,DLP technique shows good potential for manufacturing HA bioceramic scaffolds.

关键词： additive manufacturing digital light processing vat photopolymerization hydroxyapatite bioceramic scaffold

Progress and challenges towards additive manufacturing of SiC ceramic

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Journal of Advanced Ceramics 2021年第4期10卷 637-674页

作者： rujie he Niping ZHOU Keqiang ZHANG Xueqin ZHANG Lu ZHANG Wenqing WANG Daining FANG Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China

Silicon carbide(SiC)ceramic and related materials are widely used in various military and engineering *** emergence of additive manufacturing(AM)technologies provides a new approach for the fabrication of SiC ceramic *** article systematically reviews the additive manufacturing technologies of SiC ceramic developed in recent years,including Indirect Additive Manufacturing(Indirect AM)and Direct Additive Manufacturing(Direct AM)*** review also summarizes the key scientific and technological challenges for the additive manufacturing of SiC ceramic,and also forecasts its possible future *** paper aims to provide a helpful guidance for the additive manufacturing of SiC ceramic and other structural ceramics.

关键词： silicon carbide(SiC) additive manufacturing(AM) structural ceramics

Accuracy controlling and mechanical behaviors of precursor-derived ceramic SiOC microlattices by projection micro stereolithography(PμSL)3D printing

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Journal of Advanced Ceramics 2023年第11期12卷 2134-2147页

作者： Ruyue Su Jingyi Chen Xueqin Zhang Xiong Gao Wenqing Wang Ying Li rujie he State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structure Institute of Advanced Structure TechnologyBeijing Institute of TechnologyBeijing 100081China

Precursor-derived ceramic SiOC(PDC-SiOC)microlattices exhibit excellent oxidation resistance,high-temperature stability,and superior mechanical ***,the printing accuracy of the PDC-SiOC microlattices by 3D printing is still limited,and mechanical properties of the PDC-SiOC microlattices have not been studied ***,PDC-SiOC octet microlattices were fabricated by projection micro stereolithography(PμSL)3D printing,and photoabsorber(Sudan III)’s effect on the accuracy was systematically *** results showed that the addition of Sudan III improved the printing accuracy ***,the ceramization process of the green body was analyzed in *** order of the green body decreased,and most of their chemical bonds were broken during *** that,the PDC-SiOC microlattices with different truss diameters in the range of 52–220μm were fabricated,and their mechanical properties were *** PDC-SiOC microlattices with a truss diameter of 52μm exhibited higher compression strength(31 MPa)than those with bigger truss *** size effect among the PDC-SiOC microlattices was *** work provides a deeper insight into the manufacturing of PDC-SiOC micro-scaled architectures by 3D printing and paves a path to the research of the size effect in ceramic structures.

关键词： precursor-derived ceramic(PDC) microlattice projection micro stereolithography(PμSL) accuracy mechanical behaviors

3D-printed strontium-incorporatedβ-TCP bioceramic triply periodic minimal surface scaffolds with simultaneous high porosity,enhanced strength,and excellent bioactivity

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Journal of Advanced Ceramics 2023年第9期12卷 1671-1684页

作者： Yanbo Shan Yang Bai Shuo Yang Qing Zhou Gang Wang Biao Zhu Yiwen Zhou Wencan Fang Ning Wen rujie he Lisheng Zhao Chinese PLA Medical School Beijing 100853China Institute of Stomatology&Oral Maxilla Facial Key Laboratory First Medical Center of Chinese PLA General HospitalBeijing 100853China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

In bone tissue engineering,scaffolds with excellent mechanical and bioactive properties play prominent roles in space maintaining and bone regeneration,attracting increasingly interests in clinical *** this study,strontium-incorporatedβ-tricalcium phosphate(β-TCP),named Sr-TCP,bioceramic triply periodic minimal surface(TPMS)structured scaffolds were successfully fabricated by digital light processing(DLP)-based 3D printing technique,achieving high porosity,enhanced strength,and excellent *** Sr-TCP scaffolds were first characterized by element distribution,macrostructure and microstructure,and mechanical ***,the compressive strength of the scaffolds reached 1.44 MPa with porosity of 80%,bringing a great mechanical breakthrough to porous ***,the Sr-TCP scaffolds also facilitated osteogenic differentiation of mouse osteoblastic cell line(MC3T3-E1)cells in both gene and protein aspects,verified by alkaline phosphatase(ALP)activity and polymerase chain reaction(PCR)***,the 3D-printed Sr-TCP bioceramic TPMS structured scaffolds obtained high porosity,boosted strength,and superior bioactivity at the same time,serving as a promising approach for bone regeneration.

关键词： strontium β-tricalcium phosphate(β-TCP) digital light processing(DLP) 3D printing triply periodic minimal surface(TPMS) bone scaffold

陶瓷材料3D打印技术——让复杂异形陶瓷材料构件制造成为可能

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硅酸盐通报 2022年第1期41卷 363-364页

作者：何汝杰北京理工大学

陶瓷材料因其良好的力学与热学性能、良好的热氧与化学稳定性,在航空航天、装甲、空间器件、交通、核能、化工、半导体、临床医疗等国防装备与民用重大装备领域得到了广泛应用。通常,国防与民用应用场合要求使用复杂异形的陶瓷材料构件... 详细信息

陶瓷材料因其良好的力学与热学性能、良好的热氧与化学稳定性,在航空航天、装甲、空间器件、交通、核能、化工、半导体、临床医疗等国防装备与民用重大装备领域得到了广泛应用。通常,国防与民用应用场合要求使用复杂异形的陶瓷材料构件及产品,这给其制造带来了极大难题与挑战。传统复杂异形陶瓷材料构件的制造主要有两种途径:其一,采用各种不同烧结技术制备陶瓷材料块体,再经机械加工、电加工等加工手段获得复杂异形陶瓷材料构件。

关键词：陶瓷材料热学性能化学稳定性临床医疗机械加工航空航天国防装备异形

3D Printed Antennas for 5G Communication:Current Progress and Future Challenges

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第1期2卷 16-33页

作者： Yaru Wang Xueqin Zhang Ruyue Su Mingji Chen Chujing Shen Hao Xu rujie he Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China Suzhou Fanbo Additive Manufacturing Technology Co. Ltd.Suzhou215299China National Institute of Metrology Beijing100029China

With the advent of 5G and future trends for communication systems moving to millimeter wave(MMW)and higher frequencies,antennas will be required to have high gain,wide bandwidth,and low losses.3D printing realizes structures by sequential stacking layer-by-layer,which enables the manufacturing of antennas with ar-bitrary shapes in a cheaper,faster,and flexible *** study provides a review of current state-of-the-art 3D printed antennas for different ***,an overview of 3D printing technology is presented.A huge number of 3D printed antennas,categorized by their material composition,have been described,including poly-mer,metallic,ceramic,composite material,and multi-material integrated ***,the main challenges and prospects are discussed to provide insight into how 3D printing can be further progressed in antenna manu-facturing.

关键词： 3D printing Antennas,5G Millimeter wave High gain Wide bandwidth

立体光刻增材制造中固含量对Al_(2)O_(3)陶瓷性能的影响

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无机材料学报 2022年第3期37卷 353-360页

作者：刘国仟闫长海张可强金华何汝杰中国运载火箭技术研究院空间物理重点实验室北京100076 北京理工大学先进结构技术研究院北京100081 厦门大学航空航天学院厦门361005

对于陶瓷立体光刻增材制造技术,光敏树脂浆料的固含量发挥着重要的作用。本工作首先制备了不同固含量的Al_(2)O_(3)陶瓷浆料,并采用立体光刻增材制造技术,制备了Al_(2)O_(3)陶瓷,并研究了Al_(2)O_(3)浆料的固含量与陶瓷性能的关联关系... 详细信息

对于陶瓷立体光刻增材制造技术,光敏树脂浆料的固含量发挥着重要的作用。本工作首先制备了不同固含量的Al_(2)O_(3)陶瓷浆料,并采用立体光刻增材制造技术,制备了Al_(2)O_(3)陶瓷,并研究了Al_(2)O_(3)浆料的固含量与陶瓷性能的关联关系。其次,探索了固含量对Al_(2)O_(3)浆料的流变行为、固化性能,以及对Al_(2)O_(3)陶瓷的微观结构、力学性能的影响规律。结果表明,随着固含量增加,浆料的粘度和剪切应力均增大。在光固化增材制造过程中,高固含量导致浆料的粘度高于其自流平的临界值,且Al_(2)O_(3)浆料的固化性能与固含量高度相关。此外,固含量明显影响光固化增材制造的Al_(2)O_(3)陶瓷的缺陷。这些制造缺陷对于Al_(2)O_(3)陶瓷的力学性能有重要影响。最后,本工作总结了光敏Al_(2)O_(3)浆料的流变行为、固化性能与Al_(2)O_(3)陶瓷的微观结构和力学性能之间的关联关系。浆料的高粘度造成陶瓷的微观结构不均匀,最终导致其力学强度较差。本研究结果可为陶瓷的光固化增材制造提供一定的参考。

关键词： Al_(2)O_(3)陶瓷固含量光固化增材制造