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Enhanced electrochemical corrosion resistance of 316L stainless steel manufactured by ultrasonic rolling assisted laser directed energy deposition

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China Foundry 2025年第2期22卷 182-194页

作者： Guan Liu Yi-gui Su Xu-yu Pi Dong-xu Wen De-fu Liu Yong-cheng Lin School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Under the laser directed energy deposition(LDED)process,the rapid melting and solidification usually lead to the emergence of pores and coarse columnar dendrites,which in turn compromise the properties of the deposited *** study introduced in-situ ultrasonic rolling(UR)as an innovative method to enhance the corrosion resistance of LDED specimens,and the microstructural characteristics and their correlation with corrosion resistance were deeply *** findings reveal that the LDED-UR specimen exhibits a reduction in both the fraction and size of *** the influence of severe plastic deformation generated by LDED-UR process,fully equiaxed grains appear with a reduced average size of 28.61μm(compared to63.98μm for the LDED specimen with columnar grains).The electrochemical corrosion resistance of the LDED-UR specimen is significantly enhanced compared to the LDED *** enhanced corrosion resistance can be attributed to the low fraction of small-sized pores,the fine and uniformly distributed Cr-enriched ferrite phase,and the formation of a compact and thick passive film due to dense grain *** insight of the correlation between microstructure and corrosion behavior opens up a new pathway to enhance the corrosion resistance of LDED specimens.

关键词： laser directed energy deposition ultrasonic rolling 316L stainless steel microstructure electrochemical corrosion resistance

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Rational design of PrBaFe_(2)O_(6-δ)-based cathodes for protonic ceramic fuel cells

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Journal of advanced Ceramics 2024年第10期13卷 1600-1610页

作者： Yanru Yin Shiqi Zhang Ao Wang Dong Yan Jian Li Lichao Jia School of Materials Science and Engineering State Key Laboratory of Materials Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China Wuhan Institute of Marine Electric Propulsion Wuhan 430064China

Obtaining high-performance cathodes is critical for protonic ceramic fuel cells(PCFCs),as cathode performance significantly impacts fuel cell performance.A full understanding of the interactions among the diverse properties of cathode materials would benefit cathode *** this study,PrBaFe_(2)O_(6-δ)(PBF)was doped with various dopants,including cobalt(Co),Ni,Cu,Zn,and *** and first-principles calculations are used to study the key properties of dopant-modified PrBaFe_(2)O_(6-δ),including oxygen vacancy(VO)creation,hydration ability,proton mobility,and oxygen reduction reaction(ORR)*** is no perfect dopant that can improve every property to its full ***,different dopants can impact different properties of the ***-dopant has the best cathode performance since it balances the material’s instinctive properties,even though it does not provide a significant advantage in the formation of *** utilizing Co-doped PrBaFe_(2)O_(6-δ)cathode has a high performance of 1680 mW·cm^(-2) at 700℃,which is greater than that of the other dopant-tailored PrBaFe_(2)O_(6-δ)cathodes reported in this study and is one of the largest ever recorded for PrBaFe_(2)O_(6-δ)-based cathodes for ***-doped PrBaFe_(2)O_(6-δ)cathode is further demonstrated to be robust,with excellent operational *** study not only provides a potential cathode candidate for PCFCs but also suggests an intriguing approach to cathode design by carefully examining and balancing different vital properties of the material.

关键词： cathode rational design high performance protonic ceramic fuel cells(PCFCs)

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Microemulsion synthesis of Mesoporous β-tricalcium Phosphate Powder with a Novel System

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Journal of Wuhan University of technology(materials Science) 2022年第4期37卷 773-778页

作者： BIELEC Monikaq HUANG An XIA Yuhao DAI Honglian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyShenzhen 5180ooChina Shenzhen Institute of Wuhan University of Technology Wuhan 430070China

The synthesis of mesoporous β-tricalcium phosphate(β-TCP)powder was performed by using the microemulsion approach,with hexadecyltrimethyl ammonium bromide(CTAB)/cyclohexane/n-octyl alcohol microemulsion *** influences of different pH values and calcination temperatures on the phase composition of the β-TCP powder were *** in vitro proliferation of bone marrow mesenchymal stem cells(BMSCs)in the suspensions of β-TCP powders with meso-structure was *** phase composition,mesoporous structure,powder morphology,cell morphology and the optical density(OD)were characterized through X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),Fourier transform infrared(FTIR)spectroscopy,Nadsorption-desorption isotherms,inverted phase contrast microscopy and Multiskan spectrum,*** mesoporous β-TCP powder with specific surface area of 12.85 m^(2)/g and the average pore size 7.11 nm was obtained through the microemulsion approach(100 g/L CTAB/250 mL/L cyclohexane/250 mL/L n-octyl alcohol)with a controlled pH of 7.0,after calcinating the powder at 800℃.It was confirmed that mesoporous β-TCP powder benefits the activity of BMSCs more than the non-mesoporous β-TCP powder.

关键词： β-tricalcium phosphate mesoporous microemulsion bone marrow mesenchymal stem cells

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Catalytic hosts with strong adsorption strength for long shelf-life lithium-sulfur batteries under lean electrolyte

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Nano Research 2023年第1期16卷 427-438页

作者： Siyuan Zhao Huayu Pei Quan Yang Kangli Liu Yuanyuan Huang Zhuo Wang Guosheng Shao Jinping Liu Junling Guo State Center for International Cooperation on Designer Low-carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute Xingyang 450100China School of Chemistry Chemical Engineering and Life ScienceState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China

Low electrolyte/sulfur ratio(E/S)is an important factor in increasing the energy density of lithium-sulfur batteries(LSBs).Recently,the E/S has been widely lowered using catalytic hosts that can suppress“shuttle effect”during cycling by relying on a limited adsorption ***,the shelf-lives of these cathodes have not yet received ***,we show that the selfdischarge of sulfur cathodes based on frequently-used catalytic hosts is serious under low E/S because the“shuttle effect”during storage process caused by polysulfides(PSs)disproportionation cannot be suppressed using a limited adsorption *** further prove that the adsorption strength toward PSs,which is unfortunately weak in commonly-used catalytic hosts,is critical for effectively hindering the disproportionation of the ***,to verify this conclusion,we prepare a sulfur-doped titanium nitride(S-TiN)catalytic array *** the adsorption strength and catalytic activity of TiN can be improved by S doping simultaneously,the constructed S/S-TiN cathodes under a low E/S(6.5μL·mg−1)exhibit better shelf-life and cycle-stability than those of S/TiN *** work suggests that enhancing the adsorption strength of catalytic hosts,while maintaining their function to reduce E/S,is crucial for practical LSBs.

关键词： lithium-sulfur battery low electrolyte/sulfur ratio(E/S) self-discharge catalytic host adsorption strength

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Convenient folding-hot-pressing fabrication and enhanced piezoelectric properties of highβ-phasecontent poly(vinylidene fluoride)films

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Interdisciplinary materials 2024年第5期3卷 715-725页

作者： Jie Shen Yicheng Zeng Qiangzhi Li Jing Zhou Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina Sanya Science and Education Innovation Park Wuhan University of TechnologySanyaChina Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration ZoneXiangyangChina

Poly(vinylidene fluoride)(PVDF)is the most attractive piezoelectric polymer for application in flexible *** attain excellent piezoelectric properties,a substantial amount of spontaneous polarβ-phase content is highly ***,the current reported manufacturing methods to increaseβ-phase contents are inconvenient and complex,hindering progress in PVDF's *** work proposes a folding-hot-pressing method to fabricate highβ-phase-content PVDF *** characterization indicates that the films haveαandβphases and the folding-hot-pressing process transforms theαphase into theβ*** to the 97.5%β-phase content and aligned structure,a piezoelectric constant of 20 pC/N is achieved in the three-times folded ***,the process method enhances the tensile strength(126.2 MPa)of the films,with a low Young's modulus(0.87 GPa)remaining,making the films applicable for flexible piezoelectric ***,sensors based on the achieved films were assembled and applied for human physiological activity *** work offers a scalable new melt-processing strategy for developing high-performance PVDF-based piezo-electric composite films for wearable electronic devices.

关键词： flexible sensors highβ-phase content piezoelectric properties PVDF film

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Surface repair of wide-bandgap perovskites for high-performance all-perovskite tandem solar cells

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Journal of Energy Chemistry 2024年第6期93卷 64-70,I0003页

作者： Xiaojing Lv Weisheng Li Jin Zhang Yujie Yang Xuefei Jia Yitong Ji Qianqian Lin Wenchao Huang Tongle Bu Zhiwei Ren Canglang Yao Fuzhi Huang Yi-Bing Cheng Jinhui Tong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina Department of Electrical and Electronic Engineering Photonics Research Institute(PRI)Research Institute for Intelligent Wearable Systems(iWEAR)The Hong Kong Polytechnic University999077Hong KongChina Laboratory of Advanced Materials Fudan UniversityShanghai 200438China Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200GuangdongChina

Wide-bandgap(WBG)perovskite solar cells(PSCs)play a fundamental role in perovskite-based tandem solar ***,the efficiency of WBG PSCs is limited by significant open-circuit voltage losses,which are primarily caused by surface *** this study,we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide(SEBr),which can passivate both Pb^(-1)and FA^(-1)terminated surfaces,Moreover,the SEBr upshifted the Fermi level at the perovskite interface,thereby promoting carrier *** proposed method was effective for both 1.67 and 1.77 eV WBG PSCs,achieving power conversion efficiencies(PCEs)of 22.47%and 19.90%,respectively,with V_(OC)values of 1.28 and 1.33 V,along with improved film and device *** this advancement,we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10%,This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering.

关键词： Wide-bandgap perovskite Surface defect Multifunctional molecule All-perovskite tandem solar cells

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Effect of Physical Aging on Heterogeneity of Poly(ε-caprolactone)Toughening Poly(lactic acid)Probed by Nanomechanical Mapping

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Chinese Journal of Polymer Science 2023年第1期41卷 143-152页

作者： Bo-Wen Wang Hao Liu Jin Ying Chun-Tai Liu Chang-Yu Shen Ya-Ming Wang Key Laboratory of Materials Processing&Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450002China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Poly(lactic acid) (PLA) is a promising bio-based environmentally-friendly plastic. Nevertheless, the physical aging-induced brittleness of PLA limits its widespread applications. Blending with immiscible ductile polymer is an effective way to toughen PLA. However, the underlying details of the toughening mechanism and, in particular, the effect of physical aging are not well understood. Herein, atomic force microscopy (AFM) based nanomechanical mapping technology was utilized to visualize the differences in the deformation mechanisms between unaged and aged PLA/poly(ε-caprolactone) (PCL) blend upon uniaxial drawing. Results show that physical aging has a significant effect on the microscopic Young’s modulus and its distribution of PLA matrix, resulting in a highly heterogeneous response of the PLA/PCL blend to external stress and affecting the mechanical properties of the PLA phase under different extensions. This work provides a new experimental basis for understanding the effect of physical aging on the mechanical properties of PLA-based materials.

关键词： Poly(lactic acid) Blends Toughening Physical aging Nanomechanical mapping

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Ablation resistance of ZrC coating modified by polymer-derived SiHfOC ceramic microspheres at ultrahigh temperature

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Journal of materials Science & technology 2024年第15期182卷 119-131页

作者： Xuemeng Zhang Yuyu Zhang Lingxiang Guo Bing Liu Yuqi Wang Hongbin Li Hejun Li Jia Sun Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China China Aerodynamics Research and Development Center Mianyang 621000China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense TechnologyChangsha 410073China

Polymer-derived ceramics(PDCs)method opens up new possibilities for the preparation of novel multi-phase ceramic nanocomposites owing to the molecular design of the precursors at the nanoscale *** the current work,ZrC coatings incorporated with polymer-derived ceramic microspheres(CMS),SiH-fOC_CMS,were deposited to enhance the ablation resistance by supersonic atmosphere plasma *** 10.0 MW·m^(-2) plasma ablation at above 3000℃,the linear ablation rate of ZrC-SiHfOC_CMS coat-ing was reduced to 0.20μm·s^(-1),62%lower than that of the pristine ZrC *** improvement was ascribed to the presentence of viscous SiO_(2)/HfO_(2) molten mixed phase,rather than HfSiO4,which can ef-fectively seal pinholes and ***,the in-situ generated crystalline SiO_(2) had a lower oxygen diffusion rate than amorphous SiO_(2),meanwhile,m-HfO_(2) could improve the stability of SiO_(2) glassy film,thus further enhancing the ablation resistance.

关键词： ZrC Polymer-derived ceramics(PDCs) Carbon/Carbon composites Plasma spraying Plasma ablation

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Strength and ductility enhancement of twin-roll cast Al-Zn-Mg-Cu alloys with high solidification intervals through a synergistic segregation-controlling strategy

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Journal of materials Science & technology 2023年第11期142卷 225-239页

作者： Bing Lu Yong Li Wei Yu Haiyao Wang Yin Wang Zhaodong Wang Guangming Xu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Guangxi Advanced Aluminum Processing Innovation Center Co.LTD Nanning 530007China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Center segregation and banded intergranular segregation(B-IGS)should be well controlled to improve the mechanical properties of twin-roll cast(TRC)aluminum alloys,especially for alloys with high solid-ification *** the present work,a synergistic grain refinement strategy was designed using an Al-5Ti-B grain refiner and Ti,Zr,and Sc microalloying elements to simultaneously control center seg-regation and B-IGS in TRC Al-Zn-Mg-Cu *** the grain size decreased,center segregation defects were eliminated and transformed into dispersed B-IGS defects;simultaneously,the width and length of the B-IGS were also ***,the macro-distributions of the alloying elements along the thickness direction became more homogeneous due to a weak shear-induced dilation *** well-controlled multiscale segregation improved the uniformity of the alloy macrostructure,accelerated the redissolution of the crystalline phase,dispersed the aggregated residual phase,and refined grains under the T6 ***,the strength and ductility of the alloys under the T6 state were simultaneously improved,and the hardness distribution along the thickness direction became more ***,the underlying mechanisms of segregation evolution and strength and ductility enhancements were *** work provides a novel strategy to effectively control multiscale segregation and produce high-performance aluminum alloys with high solidification intervals by TRC.

关键词： Twin-roll casting Al-Zn-Mg-Cu alloy Center segregation Banded intergranular segregation Mechanical properties Grain refinement

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Three-Layer Structured SnO2@C@TiO2 Hollow Spheres for High-Performance Sodium Storage

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Energy & Environmental materials 2021年第3期4卷 428-433页

作者： Yu Tian Ping Hu Ting Zhu Zhenhui Liu Guangwu Hu Congcong Cai Zelang Jian Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory

The unsatisfactory conductivity and large volume variation severely handicap the application of SnO2in sodium-ion batteries（SIBs）. Herein, we design unique three-layer structured SnO2@C@TiO2hollow spheres to tackle the above-mentioned issues. The hollow cavity affords empty space to accommodate the volume variation of SnO2, while the C and TiO2protecting shells strengthen the structural integrity and enhances the electrical conductivity. As a result, the three-layer structured SnO2@C@TiO2hollow spheres demonstrate enhanced Na storage performances. The SnO2@C@TiO2manifests a reversible capacity two times to that of pristine SnO2hollow spheres. In addition, Ex situ XRD reveals highly reversible alloying and conversion reactions in SnO2@C@TiO2hollow spheres. This study suggests the introduction of a hollow cavity and robust protecting shells is a promising strategy for constructing SIB anode materials.

关键词： hollow sphere SnO2 sodium-ion battery protecting shell structural integrity

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