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Ultra-lightweight ceramic scaffolds with simultaneous improvement of pore interconnectivity and mechanical strength

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Journal of Materials Science & Technology 2023年第6期137卷 247-258页

作者： Ye Dong annan chen Ting Yang Shuai Gao Shuning Liu Hongyi Jiang Yusheng Shi chenglong Hu School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The high porosity and interconnectivity of scaffolds are critical for nutrient transmission in bone tis-sue engineering but usually lead to poor mechanical ***,a novel method that combines acid etching(AE)with selective laser sintering(SLS)and reaction bonding(RB)of Al particles is pro-posed to realize highly improved porosity,interconnectivity,mechanical strength,and in vitro bioactivity in 3D Al_(2)O_(3) *** controlling the oxidation and etching behaviors of Al particles,a tunable hol-low spherical feature can be obtained,which brings about the distinction in compressive response and fracture *** prevention of microcrack propagation on the in situ formed hollow spheres results in unique near elastic buckling rather than traditional brittle fracture,allowing an unparalleled compressive strength of 3.72±0.17 MPa at a high porosity of 87.7%±0.4%and pore interconnectivity of 94.7%±0.4%.Furthermore,scaffolds with an optimized pore structure and superhydrophilic surface show excellent cell proliferation and adhesion *** findings offer a promising strategy for the coexistence of out-standing mechanical and biological properties,with great potential for tissue engineering applications.

关键词： Ceramic scaffolds Selective laser sintering Acid etching Hollow spherical feature Mechanical strength In vitro bioactivity

Development of Fe-Mn-Si-Cr-Ni shape memory alloy with ultrahigh mechanical properties and large recovery strain by laser powder bed fusion

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Journal of Materials Science & Technology 2023年第19期150卷 201-216页

作者： Xiao Yang Lijin cheng Huabei Peng Bingnan Qian Lei Yang Yunsong Shi annan chen Zhengyan Zhang Libin Zhao Ning Hu Chunze Yan Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430070China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

This work systematically studied the effect of volumetric energy density E on the densification,mi-crostructures,tensile mechanical properties,and shape memory performance of a Fe-Mn-Si-Cr-Ni shape memory alloy(SMA)fabricated by laser powder bed fusion(L-PBF).An E of 90-265 J/mm3 is suggested to fabricate the Fe-Mn-Si-Cr-Ni SMA with minor metallurgical defects and a high relative density of above 99%.The increase in E can promote the formation of the primaryγaustenite and the solid phase trans-formation from the primaryδferrite to theγaustenite,which helps to achieve a nearly complete y austenitic *** increase in E also contributes to fabricating the Fe-Mn-Si-Cr-Ni SMA with superior comprehensive mechanical properties and shape memory performance by *** Fe-Mn-Si-Cr-Ni SMA with a combination of good ductility of around 30%,high yield strength of above 480 MPa,an ultrahigh ultimate tensile strength of above 1 GPa,and large recovery strain of about 6%was manu-factured by L-PBF under a high E of 222-250 J/mm^(3).The good shape memory effect,excellent compre-hensive mechanical properties,and low cost of Fe-Mn-Si-Cr-Ni SMAs,as well as the outstanding ability to fabricate complex structures of L-PBF technology,provide a solid foundation for the design and fabri-cation of novel intelligent structures.

关键词： Shape memory alloys Fe-Mn-Si-based alloys Laser powder bed fusion Mechanical property Microstructure

Microstructure evolution and mechanical properties of Al_(2)O_(3)foams via laser powder bed fusion from Al particles

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Advanced Powder Materials

Advanced Powder Materials 2023年第4期2卷 114-123页

作者： Ye Dong annan chen Ting Yang Shuai Gao Shuning Liu Bingjian Guo Hongyi Jiang Yusheng Shi Chunze Yan School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China Centre for Advanced Structural Materials Department of Mechanical EngineeringCity University of Hong KongHong KongChina

Laser powder bed fusion(LPBF)combined with reaction bonding(RB)of Al particles is an effective method for preparing high-performance 3D Al_(2)O_(3) ceramic ***,the indistinct microstructure evolution hinders the regulation of pore features and the improvement of synthetic ***,the microstructure evolution of the Al_(2)O_(3) ceramic foams during the LPBF/RB process is clariﬁed by various characterization methods,and the corresponding mechanical property modulation is realized by optimizing LPBF parameters,organic binder(E12 epoxy resin)content,heating rate,sintering time,and coral-like Al_(2)O_(3) *** expansion from Al_(2)O_(3) outward growth and Al granule precipitation counteracts the shrinkage from E12 decomposition and Al_(2)O_(3) sintering,resulting in an ultra-low shrinkage of 0.94%–3.01%.The pore structures of particle packing pores,hollow spheres,and microporous structures allow a tunable porosity of 52.6%–73.7%.The in-situ formation of multi-scale features including hollow spheres,ﬂaky grains,whiskers,nanoﬁbers,and bond bridges brings about a remarkably high bending strength of 6.5–38.3 ***ﬁndings reveal the relationship between microstructure evolution and property optimization of high-performance ceramic foams,with potential signiﬁcance for microstructure design and practical application.

关键词： Al_(2)O_(3)ceramic foams Laser powder bed fusion Reaction bonding Microstructure evolution Mechanical property modulation

3D/4D printed bio-piezoelectric smart scaffolds for next-generation bone tissue engineering

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International Journal of Extreme Manufacturing 2023年第3期5卷 236-262页

作者： annan chen Jin Su Yinjin Li Haibo Zhang Yusheng Shi Chunze Yan Jian Lu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan430074People’s Republic of China Centre for Advanced Structural Materials Department of Mechanical EngineeringCity University of Hong KongPeople’s Republic of China Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057People’s Republic of China CityU-Shenzhen Futian Research Institute Shenzhen 518045People’s Republic of China

Piezoelectricity in native bones has been well recognized as the key factor in bone ***,bio-piezoelectric materials have gained substantial attention in repairing damaged bone by mimicking the tissue’s electrical microenvironment(EM).However,traditional manufacturing strategies still encounter limitations in creating personalized bio-piezoelectric scaffolds,hindering their clinical ***-dimensional(3D)/four-dimensional(4D)printing technology based on the principle of layer-by-layer forming and stacking of discrete materials has demonstrated outstanding advantages in fabricating bio-piezoelectric scaffolds in a more complex-shaped ***,4D printing functionality-shifting bio-piezoelectric scaffolds can provide a time-dependent programmable tissue EM in response to external stimuli for bone *** this review,we first summarize the physicochemical properties of commonly used bio-piezoelectric materials(including polymers,ceramics,and their composites)and representative biological findings for bone ***,we discuss the latest research advances in the 3D printing of bio-piezoelectric scaffolds in terms of feedstock selection,printing process,induction strategies,and potential ***,some related challenges such as feedstock scalability,printing resolution,stress-to-polarization conversion efficiency,and non-invasive induction ability after implantation have been put ***,we highlight the potential of shape/property/functionality-shifting smart 4D bio-piezoelectric scaffolds in bone tissue engineering(BTE).Taken together,this review emphasizes the appealing utility of 3D/4D printed biological piezoelectric scaffolds as next-generation BTE implants.

关键词： 3D/4D printing bio-piezoelectric materials biomimetic scaffolds electrical microenvironment bone regeneration

Na^(+)/H^(+)交换体1在肾脏疾病中的作用

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中国病理生理杂志 2023年第4期39卷 721-729页

作者：陈安南丁小强宋娜娜复旦大学附属中山医院肾内科上海市肾病与血液透析重点实验室上海200032 复旦大学张江研究院上海201203

细胞内稳态的维持是细胞正常生命活动的前提。分布广泛的钠氢交换体1(Na^(+)/H^(+)exchanger 1,NHE1)是调节细胞内pH和细胞体积的重要机制,还能进一步影响细胞周期、细胞增殖和物质代谢等一系列生理过程。作为NHE家族中发现最早,研究甚... 详细信息

细胞内稳态的维持是细胞正常生命活动的前提。分布广泛的钠氢交换体1(Na^(+)/H^(+)exchanger 1,NHE1)是调节细胞内pH和细胞体积的重要机制,还能进一步影响细胞周期、细胞增殖和物质代谢等一系列生理过程。作为NHE家族中发现最早,研究甚广的亚型,NHE1还是一种重要的结构蛋白,锚定于细胞骨架并定位在特定质膜区域,通过独立于离子转运的机制影响细胞粘附、迁移,生存和凋亡,成为众多信号通路的交汇点。NHE1相关的研究主要集中在各种肿瘤和心血管疾病,在肾脏疾病中的作用尚不明确。目前肾脏疾病大多缺乏有效的治疗药物,尽管众多研究试图从现有治疗药物中探索促进再生或抑制凋亡等肾脏保护的新机制,但鲜有新药能登上KIDGO指南的推荐药物之列。

关键词：钠氢交换体1 肾脏疾病急性肾损伤

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大正时期铃木文治工会思想的演变

外国问题研究 2023年第4期 73-82,141页

作者：陈安楠苏州大学社会学院江苏苏州215000

“大逆事件”后,铃木文治的工会思想以“劳动者人格论”和“生产主义调和论”为核心,以协调为特征,在日本社会运动的寒冬里指导了友爱会的创建和发展。随着大正民主运动的推进,铃木文治认为承认日本劳动者的团结权是开展工会运动的根本... 详细信息

“大逆事件”后,铃木文治的工会思想以“劳动者人格论”和“生产主义调和论”为核心,以协调为特征,在日本社会运动的寒冬里指导了友爱会的创建和发展。随着大正民主运动的推进,铃木文治认为承认日本劳动者的团结权是开展工会运动的根本前提,并因此与日本政府形成对立,其工会思想趋于激进。随后,一方面为纠正无政府工团主义、布尔什维克主义等左翼思想的影响,另一方面因日本政府在团结权和普选权等方面做出关键性的让步,铃木文治认为采取“现实”的议会路线才是符合日本国情的可行道路,最终与政府妥协,显示出保守倾向。总之,受社会运动理论与争取团结权、普选权实践的双重影响,大正时期铃木文治的工会思想经历了由协调到激进,最后趋于保守的演变脉络,基本契合大正时期日本工人运动的变化过程,展现出日本工人运动中所存在的保守底色。

关键词：铃木文治工会思想团结权无布论争无产政党

冷等静压压强对激光选区烧结制备多孔SiC（w）/Si3N4陶瓷性能的影响

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硅酸盐学报 2019年第6期47卷 782-788页

作者：李国锐吴甲民李晨辉陈安南刘荣臻袁定坤华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室

利用激光选区烧结(SLS)技术制备多孔SiC(w)/Si3N4陶瓷素坯,对素坯进行冷等静压(CIP)处理以改善其性能,探索CIP压强对SLS制备的多孔SiC(w)/Si3N4陶瓷性能的影响。以Si3N4为原料,加入10%(质量分数)的SiC晶须,制备出适用于SLS的复合粉末,... 详细信息

利用激光选区烧结(SLS)技术制备多孔SiC(w)/Si3N4陶瓷素坯,对素坯进行冷等静压(CIP)处理以改善其性能,探索CIP压强对SLS制备的多孔SiC(w)/Si3N4陶瓷性能的影响。以Si3N4为原料,加入10%(质量分数)的SiC晶须,制备出适用于SLS的复合粉末,利用最佳SLS成型参数打印4组素坯,分别进行压强为100、150、200和250 MPa的CIP处理,经排胶及高温气氛烧结后得到多孔SiC(w)/Si3N4陶瓷。结果表明:随着CIP压强增大,素坯孔隙率减小,抗弯强度增大,而陶瓷的收缩率增大,孔隙率减小,抗弯强度增大。SiC(w)/Si3N4多孔陶瓷在250 MPa下性能最优,其Z方向收缩率、孔隙率和抗弯强度分别达到35.32%、41.19%和18.6 MPa。

关键词：氮化硅碳化硅晶须激光选区烧结冷等静压多孔陶瓷

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增材制造专用陶瓷材料及其成形技术

中国材料进展 2020年第5期39卷 337-348页

作者：何俊宏吴甲民陈安南李萌陈双李晨辉史玉升王卫华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室湖北武汉430074 增材制造陶瓷材料教育部工程研究中心湖北武汉430074 浙江华科三维科技有限公司浙江温州325000

陶瓷材料具有高强度、耐磨损、耐腐蚀和耐高温等特点,在航空航天、生物医疗和电子信息等领域具有良好的应用前景。然而,如何制造应用于上述领域的复杂形状陶瓷零件成为了一个重要的问题。目前,增材制造正逐步成为解决复杂形状陶瓷零件... 详细信息

陶瓷材料具有高强度、耐磨损、耐腐蚀和耐高温等特点,在航空航天、生物医疗和电子信息等领域具有良好的应用前景。然而,如何制造应用于上述领域的复杂形状陶瓷零件成为了一个重要的问题。目前,增材制造正逐步成为解决复杂形状陶瓷零件制造问题的有效方式。主要介绍了增材制造专用陶瓷材料及其成形技术。根据增材制造专用陶瓷材料的不同形态,可以将陶瓷材料分为粉材、丝材、片材和浆料/膏材4类。基于此,介绍了激光选区烧结(SLS)、激光选区熔化(SLM)、三维喷印(3DP)、熔融沉积制造(FDM)、分层实体制造(LOM)、立体光固化(SL)、数字光处理(DLP)以及直写成形(DIW)8类主要陶瓷增材制造技术及其应用。最后,根据陶瓷增材制造的最新研究成果,对增材制造专用陶瓷材料及其成形技术发展作出进一步的展望。

关键词：增材制造陶瓷材料成形技术陶瓷零件应用

激光选区烧结成形涡轮叶片铸造用陶瓷铸型材料及浸渗强化工艺

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精密成形工程 2024年第12期16卷 82-90页

作者：周士翔孙冬陈双陈安南闫春泽史玉升华中科技大学材料成形与模具技术国家重点实验室武汉430074 华中科技大学增材制造陶瓷材料教育部工程研究中心武汉430074 香港城市大学机械工程系中国香港999077

目的针对传统成形方法制备铝基陶瓷铸型加工周期长、难以加工复杂结构等问题,开发新的技术,以一体化制备复杂结构陶瓷铸型。方法采用激光选区烧结(Selective Laser Sintering,SLS)增材制造技术,一体化成形铝基型芯/型壳铸型。结果采用... 详细信息

目的针对传统成形方法制备铝基陶瓷铸型加工周期长、难以加工复杂结构等问题,开发新的技术,以一体化制备复杂结构陶瓷铸型。方法采用激光选区烧结(Selective Laser Sintering,SLS)增材制造技术,一体化成形铝基型芯/型壳铸型。结果采用球形氧化铝粉体颗粒级配并添加少量气相氧化硅助流剂的方法,不仅提高了粉体的松装密度和流动性,还显著提升了陶瓷生坯的烧结性能。此外,将硅溶胶和氧化铝亚微米陶瓷粉体配制成浸渗溶液,依次对铝基陶瓷素坯和脱脂后陶瓷生坯浸渗,可大幅提升其力学性能。SLS成形铝基铸形烧结后x/y轴方向收缩率仅为1.5%,z轴收缩率约为2.0%,室温和1550℃高温抗弯强度达(29.84±6.06)MPa和(18.10±1.25)MPa,蠕变为0.01%。结论利用该铝基陶瓷铸型成功铸造出单晶/柱晶涡轮叶片。结果表明,经原料和工艺优化,可实现高性能复杂结构陶瓷铸型的一体化制备。

关键词：燃气轮机叶片铸造铝基陶瓷铸型选区激光烧结

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