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Surface engineering and the application of laser-based processes to stents-A review of the latest development

Bioactive Materials 2022年第4期7卷 159-184页

作者： j.dong M.Pacella Y.Liu L.Zhao Wolfson School of Mechanical Electrical and Manufacturing EngineeringLoughborough UniversityLoughboroughLeicestershireLE113TUUK Centre for Biological Engineering Loughborough UniversityLoughboroughLeicestershireLE113TUUK

Late in-stent thrombus and restenosis still represent two major challenges in stents’*** treatment of stent is attracting attention due to the increasing importance of stenting intervention for coronary artery *** surface engineering techniques have been utilised to improve the biological response in vivo on a wide range of biomedical *** a tailorable,precise,and ultra-fast process,laser surface engineering offers the potential to treat stent materials and fabricate various 3D textures,including grooves,pillars,nanowires,porous and freeform structures,while also modifying surface chemistry through nitridation,oxidation and ***-based processes can reduce the biodegradable materials’degradation rate,offering many advantages to improve stents’performance,such as increased endothelialisation rate,prohibition of SMC proliferation,reduced platelet adhesion and controlled corrosion and ***,adequate research has been conducted on laser surface texturing and surface chemistry *** texturing on commercial stents has been also investigated and a promotion of performance of laser-textured stents has been *** this critical review,the influence of surface texture and surface chemistry on stents performance is firstly reviewed to understand the surface characteristics of stents required to facilitate cellular *** is followed by the explicit illustration of laser surface engineering of stents and/or related *** induced periodic surface structure(LIPSS)on stent materials is then explored,and finally the application of laser surface modification techniques on latest generation of stent devices is highlighted to provide future trends and research direction on laser surface engineering of stents.

关键词： Surface engineering Laser surface engineering Stent Cell response Laser textured stents

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Mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions

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journal of Magnesium and Alloys 2017年第4期5卷 423-429页

作者： j.H.He L.jin F.H.Wang S.dong j.dong National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240PR China

The Mg-Gd-Y-Zn-Zr alloys are representational and potential age-hardening systems as reported in the past ten years,but their mechanical properties are still dependent on the grain size and its *** effect of bimodal structure on mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions was *** results suggested that the volume fraction of fine grain(FG)and coarse grain(CG)could be controlled by combined processes of hot forging,extrusion and *** for the present alloys with bimodal grain size distribution,the improvement of strength is still attributed to the grain *** morphology of bimodal grain size distribution has a marked impact on the ductility of the alloy,*** the increase of coarse grain volume fraction,the elongation to failure increases at the beginning and then *** mechanism of the toughening effect of bimodal grain size distribution on the Mg-Gd-Y-Zn-Zr alloys with bimodal grain size structure has been discussed.

关键词： Mg-Gd-Y-Zr alloy Forging Extrusion Bimodal grain size distribution Mechanical properties

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EVOLUTION OF AS-CAST MICROSTRUCTURES OF 356 ALUMINIUM ALLOY CAST BY LIQUIDUS CASTING

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Acta Metallurgica Sinica(English Letters) 2003年第1期16卷 60-64页

作者： j.dong G.M.Lu j.Z.Cui Z.H.Zhao Lab. of Electromagnttic Proc. of Mat Northeastern Univ. Shenyang 110004 China

A new method (liquidus casting) was used for 356 Al alloy semi-solid slurry making. The structures of 356 Al alloy cast by a Fe mould and semi-continuous casting machine at different temperatures were investigated. How the globular grains form was also discussed. The results show that either being cast by single Fe mould or semi-continuous machine, the micro structures are not conventional dendrites but fine and net-globular grains. The average gram size is smaller than 30μm and suitable enough for thixoforming, meanwhile it can improve the mechanical properties of following products. Under the suitable casting velocity and cooling intensity, most of global grains prolong their global growth and collide with each other before dendritic growth because of the large amount of the nucleation sites.

关键词： liqwdus casting microstructure 356 Al alloy

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Composition and size dependent torsion fracture of metallic glasses

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journal of Materials Science & Technology 2021年第23期82卷 153-160页

作者： j.dong j.Shen Y.H.Sun H.B.Ke B.A.Sun W.H.Wang H.Y.Bai Institute of Physics Chinese Academy of SciencesBeijing100190PR China College of Materials Science and Opto Electronic Technology University of Chinese Academy of SciencesBeijing100049PR China Songshan Lake Materials Laboratory DongguanGuangdong523808PR China

The fracture of metallic glasses(MGs)of different compositions and sizes down to micrometers under torsion loading were systematically *** to the flat shear fracture along the circumferential plane as commonly supposed under torsion,we find that the torsion fracture of metallic glasses can deviate from flat shear plane,and the fracture angle is closely dependent on the composition and the size of MG *** a conversion method,we show that the torsion fracture of both millimeterand micrometer-sized MGs can be described by the ellipse fracture criterion as originally proposed for the tension *** deviation from the circumferential shear plane under torsion is further shown to intrinsically relate to the fracture toughness of *** tougher MG tends to have a smaller fracture angle with respect to the maximum shear plane,and vice versa,indicating a correlation between the fracture toughness and pressure/normal stress sensitivity in *** results provide new insights on the fracture mechanism and are helpful to design and control the deformation and fracture behavior of MGs under torsion loading.

关键词： Metallic glasses Torsion fracture Pressure sensitivity Fracture toughness

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Extrusion-based additive manufacturing of Mg-Zn alloy scaffolds

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journal of Magnesium and Alloys 2022年第9期10卷 2491-2509页

作者： j.dong N.Tümer M.A.Leeflang P.Taheri L.E.Fratila-Apachitei j.M.C.Mol A.A.Zadpoor j.Zhou Department of Biomechanical Engineering Delft University of TechnologyDelft 2628 CDthe Netherlands Department of Materials Science and Engineering Delft University of TechnologyDelft 2628 CDthe Netherlands

Porous biodegradable Mg and its alloys are considered to have a great potential to serve as ideal bone *** recent progress in additive manufacturing(AM) has prompted its application to fabricate Mg scaffolds with geometrically ordered porous *** AM,followed by debinding and sintering,has been recently demonstrated as a powerful approach to fabricating such Mg scaffolds,which can avoid some crucial problems encountered when applying powder bed fusion AM ***,such pure Mg scaffolds exhibit a too high rate of in vitro *** the present research,alloying through a pre-alloyed Mg-Zn powder was ultilized to enhance the corrosion resistance and mechanical properties of AM geometrically ordered Mg-Zn scaffolds *** in vitro biodegradation behavior,mechanical properties,and electrochemical response of the fabricated Mg-Zn scaffolds were ***,the response of preosteoblasts to these scaffolds was systematically evaluated and compared with their response to pure Mg *** Mg-Zn scaffolds with a porosity of 50.3% and strut density of 93.1% were composed of the Mg matrix and MgZn2second phase *** in vitro biodegradation rate of the Mg-Zn scaffolds decreased by 81% at day 1,as compared to pure Mg *** 28 days of static immersion in modified simulated body fluid,the corrosion rate of the Mg-Zn scaffolds decreased from 2.3± 0.9 mm/y to 0.7±0.1 mm/*** yield strength and Young’s modulus of the Mg-Zn scaffolds were about 3 times as high as those of pure Mg scaffolds and remained within the range of those of trabecular bone throughout the biodegradation *** culture of MC3T3-E1 preosteoblasts in Mg-Zn extracts indicated favorable *** direct cell culture,some cells could spread and form filopodia on the surface of the Mg-Zn ***,this study demonstrates the great potential of the extrusion-based AM Mg-Zn scaffolds to be further develo

关键词： Additive manufacturing Material extrusion Magnesium-zinc alloy Porous scaffold Biodegradation

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Unusually thick shear-softening surface of micrometer-size metallic glasses

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The Innovation 2021年第2期2卷 174-182页

作者： j.dong Y.Huan B.Huang j.Yi Y.H.Liu B.A.Sun W.H.Wang H.Y.Bai Institute of Physics Chinese Academy of SciencesBeijing 100190China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Nonlinear Mechanics(LNM) Institute of MechanicsChinese Academy of SciencesBeijing 100190China Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Songshan Lake Materials Laboratory DongguanGuangdong 523808China

The surface of glass is crucial for understanding many fundamental processes in glassy solids.A common notion is that a glass surface is a thin layer with liquid-like atomic dynamics and a thickness of a few tens of ***,we measured the shear modulus at the surface of both millimeter-size and micrometer-size metallic glasses(MGs)through high-sensitivity torsion *** found a pronounced shear-modulus softening at the surface of *** with the bulk,the maximum decrease in the surface shear modulus(G)for the micro-scale MGs reaches~27%,which is close to the decrease in the G upon glass transition,yet it still behaves ***,the surface thickness estimated from the shear-modulus softening is at least 400 nm,which is approximately one order of magnitude larger than that revealed from the glass *** unusually thick surface is also confirmed by measurements using X-ray nano-computed tomography,and this may account for the brittle-to-ductile transition of the MGs with size *** unique and unusual properties at the surface of the micrometer-size MGs are physically related to the negative pressure effect during the thermoplastic formation process,which can dramatically reduce the density of the proximate surface region in the supercooled liquid state.

关键词： glass surface shear modulus torsion metallic glasses

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金刚石刀具化学磨损的预防

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超硬材料工程 2006年第5期18卷 42-47页

作者： j.dong 蒋修治

单晶金刚石刀具因其化学磨损严重,不适用于微切削加工铁基材料。为了保护金刚石刀具免受化学磨损,可将切削刀具沉积硬质涂层,以防止金刚石与工件材料直接接触。本研究则利用磁控溅射工艺在金刚石刀具上沉积T iN、T iA lN和A lN涂层。经... 详细信息

单晶金刚石刀具因其化学磨损严重,不适用于微切削加工铁基材料。为了保护金刚石刀具免受化学磨损,可将切削刀具沉积硬质涂层,以防止金刚石与工件材料直接接触。本研究则利用磁控溅射工艺在金刚石刀具上沉积T iN、T iA lN和A lN涂层。经过优化工艺参数,所沉积涂层的化学成分接近化学计量,表面非常光滑,晶粒很细,硬度高且附着强度大。虽然刃口半径因涂层略有增加,但对微切削加工来说仍可容忍。在试验切削条件下,与参比未涂层金刚石刀具相比,T iA lN涂层金刚石刀具磨损的减少高达50%。

关键词：单晶金刚石刀具化学磨损磁控溅射涂层微切削加工预防

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残留奥氏体对下贝氏体短时热处理工具钢性能的影响

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热处理 2013年第1期28卷 59-64页

作者： H.Vetters j.dong H.W.Zoch 顾剑锋 Foundation Institute of Materials Science 上海交通大学

近期研究表明,铬合金工具钢进行低成本的下贝氏体短时处理是可行的。但这些稍高于Ms温度的热处理保留了一定数量的残留奥氏体。为了更好地从金相学的角度弄清奥氏体转变为下贝氏体的机制,采用膨胀法进行了试验研究。以100Cr6(SAE 52100... 详细信息

近期研究表明,铬合金工具钢进行低成本的下贝氏体短时处理是可行的。但这些稍高于Ms温度的热处理保留了一定数量的残留奥氏体。为了更好地从金相学的角度弄清奥氏体转变为下贝氏体的机制,采用膨胀法进行了试验研究。以100Cr6(SAE 52100)钢为例,论述了经不同工艺热处理后的组织特征和性能变化。

关键词：贝氏体贝氏体热处理残留奥氏体疲劳冷作钢滚动轴承钢

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Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO_(2)cathode material

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International journal of Minerals,Metallurgy and Materials 2025年第1期32卷 80-91页

作者： junjie Shi Changle Hou jingjing dong dong Chen jianzhong Li Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

With the continuous increase in the disposal volume of spent lithium-ion batteries(LIBs),properly recycling spent LIBs has become essential for the advancement of the circular *** study presents a systematic analysis of the chlorination roasting kinetics and proposes a new two-step chlorination roasting process that integrates thermodynamics for the recycling of LIB cathode *** activation energy for the chloride reaction was 88.41 kj/mol according to thermogravimetric analysis–derivative thermogravimetry data obtained by using model-free,model-fitting,and Z(α)function(αis conversion rate).Results indicated that the reaction was dominated by the first-order(F1)model when the conversion rate was less than or equal to 0.5 and shifted to the second-order(F2)model when the conversion rate exceeded *** conditions were determined by thoroughly investigating the effects of roasting temperature,roasting time,and the mass ratio of NH_(4)Cl to LiCoO_(2).Under the optimal conditions,namely 400℃,20 min,and NH_(4)Cl/LiCoO_(2)mass ratio of 3:1,the leaching efficiency of Li and Co reached 99.43% and 99.05%,*** of the roasted products revealed that valuable metals in LiCoO_(2)transformed into CoCl_(2) and ***,the reaction mechanism was elucidated,providing insights for the establishment of a novel low-temperature chlorination roasting technology based on a crystal structure *** technology can guide the development of LIB recycling processes with low energy consumption,low secondary pollution,high recovery efficiency,and high added value.

关键词： spent lithium-ion battery thermodynamics chlorination roasting kinetics circular economy

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Enhanced solid-electrolyte interface efficiency for practically viable hydrogen-air fuel cell systems

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journal of Energy Chemistry 2025年第1期100卷 356-368页

作者： Venkitesan Sakthivel dong jin Yoo Graduate School Department of Energy Storage/Conversion Engineering (BK21 FOUR) Hydrogen and Fuel Cell Research Center Jeonbuk National University Jeonju Department of Life Science Jeonbuk National University

Proton exchange membrane fuel cells （PEMFCs） provide an appealing sustainable energy system,with the solid-electrolyte membrane playing a crucial role in its overall ***,sulfonated poly（1,4-phenylene ether-ether sulfone）(SPEES),an aromatic hydrocarbon polymer,has garnered considerable attention as an alternative to Nafion ***,the long-term durability and stability of SPEES present a significant *** this context,we introduce a potential solution in the form of an additive,specifically a core–shell-based amine-functionalized iron titanate （A–Fe2TiO5）,which holds promise for improving the lifetime,proton conductivity,and power density of SPEES in *** modified SPEES/A–Fe2TiO5composite membranes exhibited notable characteristics,including high water uptake,enhanced thermomechanical stability,and oxidative ***,the SPEES membrane loaded with 1.2 wt%of A–Fe2TiO5demonstrates a maximum proton conductivity of 155 mS cm-1,a twofold increase compared to the SPEES membrane,at 80°C under 100%relative humidity （RH）.Furthermore,the 1.2 wt%of A–Fe2TiO5/SPEES composite membranes exhibited a maximum power density of 397.37 mW cm-2and a current density of 1148 mA cm-2at 60°C under 100%RH,with an opencircuit voltage decay of 0.05 m V/h during 103 h of continuous *** study offers significant insights into the development and understanding of innovative SPEES nanocomposite membranes for PEMFC applications.

关键词： Composite membranes

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