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Local corrosion mechanism of SiO2-based refractories caused by slag movement near solid–liquid–gas interface in different slag systems 认领 引用 被引量：1
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作者 Zhang-fu YUAN Shan-shan XIE +2 位作者 Xiang-tao YU Yan-gang ZHANG Rong-yue WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第9期1975-1982,共8页
Slag movement on SiO2-based prism refractories in different slag systems was observed. The cross section shape evolution mechanism was discussed. Two types of shape evolution appear. For PbO-SiO2 slag whose surface te... Slag movement on SiO2-based prism refractories in different slag systems was observed. The cross section shape evolution mechanism was discussed. Two types of shape evolution appear. For PbO-SiO2 slag whose surface tension improves with SiO2 concentration, slag film flows up along four edges under axial Marangoni shear force and wettability. Then, it flows down along four lateral faces under gravity. Corrosion rate at edges is larger than that on lateral faces due to different SiO2 solubilities of ascending and descending flow. Prism cross section shape changes from square to round. For FetO-SiO2 slag whose surface tension reduces with the increase of SiO2 concentration, slag film flows up under the inflence of wettability. Then, it flows down under Marangoni shear force and gravity. Compared to four edges, slag is mainly up and down on four lateral faces due to larger surface tension and size. So, prism cross section shape keeps square. 展开更多
关键词 Marangoni convection slag film local corrosion solid-liquid-gas interface SiO2-based refractories
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Controllable resistive switching of STO:Ag/SiO2-based memristor synapse for neuromorphic computing 认领 引用 被引量：2
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作者 Nasir Ilyas Jingyong Wang +6 位作者 Chunmei Li Hao Fu Dongyang Li Xiangdong Jiang Deen Gu Yadong Jiang Wei Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第2期254-263,共10页
Resistive random-access memory(RRAM)is a promising technology to develop nonvolatile memory and artificial synaptic devices for brain-inspired neuromorphic computing.Here,we have developed a STO:Ag/SiO2 bilayer bas... Resistive random-access memory(RRAM)is a promising technology to develop nonvolatile memory and artificial synaptic devices for brain-inspired neuromorphic computing.Here,we have developed a STO:Ag/SiO2 bilayer based memristor that has exhibited a filamentary resistive switching with stable endurance and long-term data retention ability.The memristor also exhibits a tunable resistance modulation under positive and negative pulse trains,which could fully mimic the potentiation and depression behavior like a bio-synapse.Several synaptic plasticity functions,including long-term potentiation(LTP)and long-term depression(LTD),paired-pulsed facilitation(PPF),spike-rate-dependent-plasticity(SRDP),and post-tetanic potentiation(PTP),are faithfully implemented with the fabricated memristor.Moreover,to demonstrate the feasibility of our memristor synapse for neuromorphic applications,spike-timedependent plasticity(STDP)is also investigated.Based on conductive atomic force microscopy observations and electrical transport model analyses,it can be concluded that it is the controlled formation and rupture of Ag filaments that are responsible for the resistive switching while exhibiting a switching ratio of~10;along with a good endurance and stability suitable for nonvolatile memory applications.Before fully electroforming,the gradual conductance modulation of Ag/STO:Ag/SiO2/p++-Si memristor can be realized,and the working mechanism could be explained by the succeeding growth and contraction of Ag filaments promoted by a redox reaction.This newly fabricated memristor may enable the development of nonvolatile memory and realize controllable resistance/weight modulation when applied as an artificial synapse for neuromorphic computing. 展开更多
关键词 Ag/STO:Ag/SiO2/p++-Si memristor Filamentary resistive switching Resistance/weight modulation Synaptic plasticity Normomorphic computing
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Effect of ZrO2-based refractory on non-metallic inclusions in nickel-based superalloy K4169 认领 引用
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作者 Li-Kun Long Lin-Zhu Wang +3 位作者 Xiang Li Chao-Yi Chen Jun-Qi Li Xing Ran 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期63-74,共12页
The effects of ZrO2-based refractory materials on non-metallic inclusions in nickel-based superalloy K4169 were systematically investigated.Analytical methods,including X-ray fluorescence,X-ray diffraction,scanning... The effects of ZrO2-based refractory materials on non-metallic inclusions in nickel-based superalloy K4169 were systematically investigated.Analytical methods,including X-ray fluorescence,X-ray diffraction,scanning electron microscopy equipped with energy dispersive spectrometry,and FactSage simulations,revealed that the refractory primarily consisted of ZrO2,MgO,MgO·Al2O3,and Zr1.74Y0.26O3.87 phases.During melting,MgO reacted with[Al]and[O]in the alloy,forming MgO·Al2O3 at the interface.This phase adhered to the superalloy,while ZrO2 phases remained stable.The inclusions in the alloy transformed from Al2O3 to MgO·Al2O3,with variations in size and distribution influenced by location and pressure.FactSage kinetic simulations aligned with experimental findings,elucidating the interaction mechanisms between the alloy and refractory.These results provide insights into optimizing refractory materials for improved cleanliness and performance in nickel-based superalloy production. 展开更多
关键词 ZrO2-based refractory Nickel-based superalloy Non-metallic inclusion Kinetic calculation
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Modulation of wettability and interfacial reaction between DZ125 superalloy and Al2O3-based ceramic shell:Rare earth oxide doping strategy 认领 引用
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作者 Baohong Kou Wentao Zhou +1 位作者 Yujie Lin Jing Ouyang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第3期933-945,I0007,共13页
To inhibit the interfacial(displacement)reaction between Hf and Al elements in the DZ125 superalloy and the Al2O3 and SiO2 in the Al2O3-based ceramic shell,rare-earth oxides(La2O3 and Y2O3)w... To inhibit the interfacial(displacement)reaction between Hf and Al elements in the DZ125 superalloy and the Al2O3 and SiO2 in the Al2O3-based ceramic shell,rare-earth oxides(La2O3 and Y2O3)were used as dopants into the shell.The effects of dopant types and contents(2 wt%,5 wt%and 8 wt%)on the wettability and interfacial reaction were investigated using the sessile-drop experiment,and the reaction products were analyzed by X-ray diffraction(XRD),a scanning electron microscope(SEM),an electron probe microanalyzer(EPMA)and X-ray photoelectron spectroscopy(XPS),to clarify the mechanism of dopants in the interracial reaction.The results show that increasing the Y2O3 doping content(2 wt%-8 wt%)reduces the surface porosity from 22.39%to 13.43%,and decreases the surface roughness from 3.25 to 2.28μm,which enhances the packing density of the shell surface.In the sintering process(1223 K,2 h),both La2O3 and Y2O3 dopants react with SiO2,forming La2Si2O7 and Y2SiO5 on the shell surface.During the interfacial reaction process(1823 K,40 min),La2Si2O7 decomposes and reacts with Al2O3 and HfO2,resulting in the formation of SiO2·HfO2·La2O3 and Al2O3·HfO2·La2O3 ternary composite oxides within the reaction products.At 8 wt%La2O3 dopant content,the interfacial reaction is exacerbated,resulting in the uneven wettability.Y2SiO5 further reacts with Al2O3 and SiO2 to form SiO2·Al2O3·Y2O3 ternary composite oxides,while Y2O3 combines with Al2O3 to form Al5Y3O12(VAG),which stabilizes the oxides within the shell and inhibits the interfacial reaction,and significantly improves the surface quality of the DZ125 superalloy.As the Y2O3 dopant content increases(2 wt%-8 wt%),the wetting angle increases from 97.8°to 110.6°. 展开更多
关键词 Al2O3-Based ceramic shel DZ125 superalloy Rare earths Dopant Interfacial reaction Wettability
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HfO2-based ferroelectrics for next-generation multi-level non-volatile memory:From fundamentals to prospects 认领 引用
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作者 Binjian Zeng Yahao Xue +4 位作者 Kejun Tan Ji Zou Shuaizhi Zheng Yichun Zhou Min Liao 《Journal of Materiomics》 SCIE EI CSCD 2026年第4期199-213,共15页
Ferroelectric memory has emerged as a highly promising candidate for next-generation non-volatilememory,offering ultra-low power consumption,ultrafast read/write speeds,high reliability,and sig-nificant potential for ... Ferroelectric memory has emerged as a highly promising candidate for next-generation non-volatilememory,offering ultra-low power consumption,ultrafast read/write speeds,high reliability,and sig-nificant potential for high-density integration.Over the past fifteen years in particular,the discovery offerroelectricity in HfO2-based thin films has attracted widespread attention and stimulated substantialprogress in this field.Previous review articles have provided comprehensive summaries of represen-tative advances in the field,covering topics including the origin of ferroelectricity in HfO2,depositionmethods,the performances of HfO2-based ferroelectric thin films and memory devices,as well asprogress in device physics,integration strategies,and emerging applications.However,more recentbreakthroughs in the multi-level devices have not yet been systematically reviewed.These de-velopments are becoming increasingly critical for mass data storage and emerging paradigms such asin-memory computing.In this review,we summarize recent progress in HfO2-based ferroelectric multi-level memories,with a focus on material studies,device designs,and emerging applications.By high-lighting these advances,we aim to delineate both the persistent challenges and opportunities associatedwith this technology,with the goal of inspiring further innovation in the field. 展开更多
关键词 Device-to-device variation Endurance HfO2-Based ferroelectric thin film Multi-level memory Scalability
Effect of active metal oxide dopants on wettability and interfacial reaction between K417G superalloy and Al2O3-based ceramic shell 认领 引用
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作者 Bao-hong KOU Wen-tao ZHOU +1 位作者 Yong-hui PENG Jing OUYANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期244-258,共15页
Some active metal oxides(Al2O3,TiO2,and Cr2O3)were selected as dopants to the Al2O3-based ceramic shells for investment casting of K417G superalloy.The effects of dopant types and contents(0,2,5,a... Some active metal oxides(Al2O3,TiO2,and Cr2O3)were selected as dopants to the Al2O3-based ceramic shells for investment casting of K417G superalloy.The effects of dopant types and contents(0,2,5,and 8 wt.%)on the wettability and interfacial reaction between the alloy and shell were investigated by a sessile-drop experiment.The results show that increasing the Al2O3 doping contents(0−8 wt.%)reduces the porosity(21.74%−10.08%)and roughness(3.22−1.34μm)of the shell surface.The increase in Cr2O3 dopant content(2−8 wt.%)further exacerbates the interfacial reaction,leading to an increase in the thickness of the reaction layer(2.6−3.1μm)and a decrease in the wetting angle(93.9°−91.0°).The addition of Al2O3 and TiO2 dopants leads to the formation of Al2TiO5 composite oxides in the reaction products,which effectively inhibits the interfacial reaction.The increase in TiO2 dopant contents(0−8 wt.%)further promotes the formation of Al2TiO5,which decreases the thickness of the interfacial reaction layer(3.9−1.2μm)and increases the wetting angle(95.0°−103.8°).The introduced dopants enhance the packing density of the shell surface,while simultaneously suppress the diffusion of active metal elements from the alloy matrix to the interface. 展开更多
关键词 Al2O3-based ceramic shell K417G superalloy metal oxide dopants interfacial reaction wettability
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Effect of Ce element on hydrogen storage property of TiMn2-based alloys 认领 引用
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作者 Wenjiao Zhou Tongyue Li +3 位作者 Anjia Zhang Yaheng Zhao Qichen Tang Xiping Song 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第3期971-979,共9页
This study investigates the effect of Ce content on the hydrogen storage properties of Ti0.98Zr0.02Mn1.5Cr0.05V0.43Fe0.09Cex(x=0,0.02,0.04,and 0.06,at%)alloys.Microstructural analysis of these all... This study investigates the effect of Ce content on the hydrogen storage properties of Ti0.98Zr0.02Mn1.5Cr0.05V0.43Fe0.09Cex(x=0,0.02,0.04,and 0.06,at%)alloys.Microstructural analysis of these alloys revealed dendritic microstructures without the segregation of chemical elements,with the C14 Laves phase identified as the dominant phase.After two activation cycles at 4 MPa and 293 K,the alloys exhibited excellent hydrogen absorption properties.The addition of Ce significantly improved the kinetics of the alloys.At x=0.02,the hydrogen absorption capacity reached 90%of its maximum within 137 s at 293 K.Pressure-composition-temperature curves indicated that hydrogen absorption capacity initially increased first and then decreased with increasing Ce content,reaching a maximum value of 1.85wt%at x=0.04.Thermodynamic results demonstrated that the enthalpy and entropy of hydrogen absorption followed a similar trend,which was consistent with the variation in hydrogen storage capacity.Thus,the improvement in hydrogen absorption capacity due to the addition of Ce is attributed to the increase in enthalpy.The increase of the lattice constant in the C14 Laves phase and the deoxidization effect of Ce are expected to be beneficial for the improvement of hydrogen absorption kinetics. 展开更多
关键词 hydrogen storage property TiMn2-based alloys Ce element pressure-composition-temperature curve
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Enhancing polishing property of CeO2-based abrasives by co-doping with lanthanide and fluorine 认领 引用
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作者 Guangda Han Tian Xing +5 位作者 Dingai Xiang Min Cao You Xue Ziyu Yang Jilei Zhu Junjie Xu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第7期2186-2194,I0007,共9页
The development of CeO2-based abrasives that simultaneously deliver faster processing speeds and smoother surfaces remains a significant challenge for semiconductor polishing applications,as it is difficult to make... The development of CeO2-based abrasives that simultaneously deliver faster processing speeds and smoother surfaces remains a significant challenge for semiconductor polishing applications,as it is difficult to make further progress by optimization of solely Ce3+content or particle size.In this work,we engineered lanthanide and fluorine co-doped CeO2-based abrasives to concurrently optimize both particle size and Ce3+content.Fluorine doping effectively reduces the particle size to approximately50 nm while simultaneously enhances the Ce3+concentration.Synergistic optimization is achieved in Fdoped Ce0.8La0.2Oxand Ce0.8Pr0.2Oxabrasives due to the additional enhancement of Ce3+content and generation of rare earth oxyfluorides,which can promote the polishing efficiency.Notably,F-doped Ce0.8La0.2Oxand Ce0.8Pr0.2Oxabrasives show material removal rates of 540.42 and 789.15 nm/min,which are 1.57 and 2.3 times that of CeO2.K9 substrate polished by F-doped Ce0.8La0.2Oxand Ce0.8Pr0.2Oxabrasives exhibits an average surface roughness of 0.091 and 0.018 nm,which are lower than 0.337 nm achieved by pristine CeO2.The results offer guidance for the design and preparation of highperformance CeO2-based abrasives. 展开更多
关键词 CeO2-based abrasives Particle size Ce3+content Synergistic effect Co-doping Rare earths
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Effect of mesoporous FA-SiO2 extracted from fly ash on the structural and photocatalytic properties of g-C3N4-based materials 认领 引用
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作者 Xianhua LI Qingbo YU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2025年第7期694-706,共13页
To explore high value-added utilization pathways of fly ash,the mesoporous structure of silicon dioxide extracted from fly ash(FA-SiO2)was utilized to restrict the dicyandiamide(DCDA)thermal degradation process.Thi... To explore high value-added utilization pathways of fly ash,the mesoporous structure of silicon dioxide extracted from fly ash(FA-SiO2)was utilized to restrict the dicyandiamide(DCDA)thermal degradation process.This produced chemically bonded interacting composite photocatalysts of FA-SiO,and graphitic-phase carbon nitride(g-C3N4).Compared with the spherical silicon dioxide prepared using tetraethyl orthosilicate(TEOS-SiO2),the mesoporous structure of FA-SiO2,allowed DCDA to react in a smaller space,which facilitated the transformation of DCDA to melamine by the thermal degradation kinetics of FA-C3N4/DCDA.This ultimately boosted the formation of an N-atom-removed triazine ring structure and a multistage structure combining lumps and rods in the composite photocatalysts of g-C3N4,and FA-SiO2,which led to a higher visible-light utilization efficiency,a suitable valence-band position,and the photocatalytic activity for methylene blue reaching 3.56 times that of g-C3N4.The findings indicate that mesoporous FA-SiO,has the potential to improve the structural and photocatalytic properties of g-C3N4,-based materials. 展开更多
关键词 Fly ash(FA) FA-SiO2 g-C3N4-based materials Structural and photocatalytic properties
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Remarkable Enhancement of the Activity and Hydrothermal Stability of a CeO2-Based NH3-SCR Catalyst by Sn Modification 认领 引用 被引量：3
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作者 Ying Zhu Jingjing Liu +5 位作者 Guangzhi He Shaohua Xie Wenpo Shan Zhihua Lian Fudong Liu Hong He 《Engineering》 SCIE EI CSCD 2025年第5期141-150,共10页
Catalytic activity and hydrothermal stability are both crucial for the application of the selective catalytic reduction of NOxwith NH3(NH3-SCR)catalyst in diesel vehicles.In this study,a tin(Sn)-modified Ce-N... Catalytic activity and hydrothermal stability are both crucial for the application of the selective catalytic reduction of NOxwith NH3(NH3-SCR)catalyst in diesel vehicles.In this study,a tin(Sn)-modified Ce-Nb mixed-oxide catalyst was synthesized as an NH3-SCR catalyst for NOxemission control.After the intro-duction of Sn,both the NH3-SCR activity and the hydrothermal stability of the catalyst were remarkably promoted.Even after hydrothermal aging at 1000℃,the developed Ce1Sn2Nb1Oxcatalyst achieved more than 90%NOxconversion at 325-500℃.Various methods,including N2-physisorption,X-ray diffraction,in-situ high-temperature X-ray diffraction,high-resolution transmission electron microscopy,X-ray pho-toelectron spectroscopy,X-ray absorption fine-structure spectroscopy,temperature-programmed reduc-tion of hydrogen,temperature-programmed desorption of ammonia,and density functional theory calculations were used to investigate the promotional effects induced by the Sn species.The characteri-zation results showed that the addition of Sn not only promoted the formation of the Ce-Nb active phase but also improved its thermal stability,contributing to the excellent NH3-SCR performance and hydrothermal stability.This study provides an excellent sintering-resistance catalyst for the application of diesel engine NOxemission control. 展开更多
关键词 SnO2 CeO2-based catalyst NH3-SCR Hydrothermal stability NOxemission control
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A review of Al2O3-based eutectic ceramics for high-temperature structural materials 认领 引用 被引量：3
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作者 Xu Wang Yujie Zhong Qiaodan Hu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第11期214-232,共19页
Al2O3-based eutectic ceramics are considered as promising candidates for ultra-high-temperature structural materials due to their exceptional thermal stability and mechanical properties.Nonetheless,several chall... Al2O3-based eutectic ceramics are considered as promising candidates for ultra-high-temperature structural materials due to their exceptional thermal stability and mechanical properties.Nonetheless,several challenges must be overcome before they can be widely used.This paper reviews in detail the tailoring of microstructure from the aspect of process parameters,the updated knowledge gained in microstructure(crystallographic orientation,high-resolution interfacial structures)and the latest means of optimizing eutectic microstructure(seed-induced method,introducing low-energy grain boundaries and high-entropy phase).Additionally,the paper explores future techniques for the fabrication of bulk ceramic materials and effective toughening approaches.This review highlights the achievements made especially in the last 15 years,current limitations in Al2O3-based eutectic ceramics,and offers comprehensive insights and strategic guidance for further mechanical breakthroughs. 展开更多
关键词 Al2O3-based eutectic ceramics Eutectic solidification Interfacial structures Mechanical properties High-entropy oxides
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二陈汤通过Nrf2/HO-1信号通路调节氧化应激和代谢紊乱改善SiO2诱导的肺损伤 认领 引用
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作者 芦俊 朱馨怡 +6 位作者 刘子怡 胡吉霞 陈佳露 肖荣 王智槟 刘畅 卢芳国 《中国实验方剂学杂志》 CAS CSCD 北大核心 2026年第13期32-42,共11页
目的:观察二陈汤对二氧化硅(SiO2)诱导肺损伤大鼠的保护作用,探讨其作用机制。方法:采用一次性气管滴注50 g·L-1 SiO2混悬液建立肺损伤大鼠模型。将30只雄性SD大鼠随机分为正常组,模型组,二陈汤低、高剂量组(4.5、9 g·k... 目的:观察二陈汤对二氧化硅(SiO2)诱导肺损伤大鼠的保护作用,探讨其作用机制。方法:采用一次性气管滴注50 g·L-1 SiO2混悬液建立肺损伤大鼠模型。将30只雄性SD大鼠随机分为正常组,模型组,二陈汤低、高剂量组(4.5、9 g·kg-1·d-1)和地塞米松组(0.2 mg·kg-1·d-1),连续干预4周。苏木素-伊红(HE)染色观察肺组织病理变化;生化法检测肺组织丙二醛(MDA)、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GPX)水平;实时荧光定量聚合酶链式反应(Real-time PCR)、蛋白免疫印迹法(Western blot)及免疫荧光法检测核因子E2相关因子2(Nrf2)/血红素加氧酶-1(HO-1)信号通路关键分子的表达。超高效液相色谱-串联质谱法(UPLC-MS/MS)鉴定二陈汤主要活性成分,结合分子对接技术评估其核心成分与Nrf2/HO-1的结合能力。超高效液相色谱-四极杆-飞行时间质谱法(UPLC-Q-TOF-MS)非靶向代谢组学技术分析肺组织代谢谱,相关性分析筛选与Nrf2/HO-1信号通路密切相关的差异代谢物及指标。结果:与正常组比较,模型组大鼠体质量增长率显著降低,肺指数显著升高,肺组织MDA含量显著升高,SOD和GPX活性明显降低,Nrf2 mRNA及蛋白表达明显降低,HO-1、GPX4蛋白表达明显降低,Kelch样ECH关联蛋白1(Keap1)蛋白明显升高(P<0.05,P<0.01)。与模型组比较,二陈汤明显减缓SiO2诱导的大鼠体质量下降趋势(P<0.05);减轻大鼠肺泡炎性细胞浸润和矽结节形成;降低肺组织MDA含量,提高SOD和GPX活性(P<0.05,P<0.01)。UPLC-MS/MS和分子对接结果显示橙皮苷、甘草酸等二陈汤核心成分与Nrf2/HO-1具有强结合亲和力;分子生物学实验表明二陈汤可促进Nrf2核转位,上调HO-1、GPX4 mRNA及蛋白表达,下调Keap1表达(P<0.05,P<0.01)。代谢组学结果显示,二陈汤可回调SiO2诱导的亚油酸、谷氨酰胺等代谢物异常表达(P<0.05,P<0.01)。相关性分析表明,Nrf2、HO-1与SOD、GPX呈明显正相关(P<0.05,P<0.01),与谷氨酰胺、丝氨酸呈明显负相关(P<0.05,P<0.01)。结论:二陈汤可能通过核心成分激活Nrf2/HO-1信号通路,调节氧化应激及代谢紊乱,从而改善SiO2诱导的大鼠肺损伤,为防治职业性肺损伤提供实验依据。 展开更多
关键词 二陈汤 二氧化硅(SiO2) 肺损伤 核因子E2相关因子2(Nrf2)/血红素加氧酶-1(HO-1)信号通路 氧化应激 代谢紊乱
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Origin of high strength and good ductility of TiH2-based powder metallurgy titanium alloy with discontinuous lamellar structures 认领 引用 被引量：1
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作者 Hai-rui ZHANG Hong-zhi NIU +3 位作者 Chao YANG Nan XIANG De-liang ZHANG Fu-xiao CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第10期3342-3356,共15页
A unique discontinuous lamellar microstructure of titanium alloys consisting of lamellar colonies at prior β-Ti grain boundaries and internal interwoven α-laths is prepared by a TiH2-based powder metallurgy metho... A unique discontinuous lamellar microstructure of titanium alloys consisting of lamellar colonies at prior β-Ti grain boundaries and internal interwoven α-laths is prepared by a TiH2-based powder metallurgy method.The α-variants get various crystallographic orientations and become discontinuous during vacuum annealing at 700℃.Remarkably,nanoscale phase δ-TiH compound layers are generated between α-laths and β-strips,so that dislocations are piled up at the α/δ/βinterfaces during tensile deformation.This leads to dislocation slips being confined to individual α-laths,with differentslips and particularly pyramidalslips being activated.The efficiency of wavy slip is promoted and the work hardening rate is enhanced.Finally,the combined effect of dispersed micro-shear bands and lath distortions is considered contributive for alleviating the stress concentration at grain boundaries,resulting in a high-promising synergy of enhanced ultimate tensile strength of 1080 MPa and good elongation to fracture of 13.6%. 展开更多
关键词 TiH2-based powder metallurgy discontinuous lamellar microstructure interfacialδ-TiH phase tensile properties deformation behavior
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TiO2-Ag双功能涂层协同修饰的SiO基复合负极材料制备及高容量锂离子存储性能研究 认领 引用
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作者 吴霞 张海燕 洪浩群 《新能源进展》 CSCD 北大核心 2026年第2期167-175,共9页
为满足锂离子电池领域对高容量、长寿命储能技术的迫切需求,硅基负极材料因其高理论容量优势成为产业化应用研究的重点。然而,硅(Si)在锂化过程中严重的体积膨胀制约了其应用。与Si相比,一氧化硅(SiO)的体积膨胀虽有所降低,但仍存在本... 为满足锂离子电池领域对高容量、长寿命储能技术的迫切需求,硅基负极材料因其高理论容量优势成为产业化应用研究的重点。然而,硅(Si)在锂化过程中严重的体积膨胀制约了其应用。与Si相比,一氧化硅(SiO)的体积膨胀虽有所降低,但仍存在本征电导率低和初始库仑效率低等问题。为解决SiO材料的缺陷,采用二氧化钛(TiO2)和银(Ag)双功能涂层修饰策略,通过球磨法和溶胶凝胶法制备了TiO2和Ag双涂层修饰的SiO基复合材料(D-SiO@TiO2@Ag)。电化学测试表明,在0.2 A/g电流密度下,该复合材料经过100次循环后可逆容量为1164.3 mA·h/g,容量保持率为73.29%,显著高于未修饰SiO的547.9 mA·h/g和34.16%。D-SiO@TiO2@Ag复合材料结合了SiO的高容量和TiO2的缓解体积膨胀优势,同时通过Ag纳米颗粒提升了导电性和电荷传输性能,为新一代高容量、高稳定性的硅基负极材料提供了设计思路。 展开更多
关键词 纳米复合材料 锂离子电池 硅基负极 银纳米颗粒 SiO TiO2
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Achieving ultrawide zero thermal expansion and enhanced mechanical strength in boron-microalloyed Er2Fe17 ferrimagnet 认领 引用
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作者 Bo Feng Meifang Shi +3 位作者 Jun Liu Zhida Han Yujing Zhang Feng Xu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第7期2140-2145,I0005,共6页
Materials possessing zero thermal expansion(ZTE)can resist thermal shock,making them highly valuable in precision instruments.Here we propose to simultaneously achieve ultrawide ZTE and optimized mechanical properties... Materials possessing zero thermal expansion(ZTE)can resist thermal shock,making them highly valuable in precision instruments.Here we propose to simultaneously achieve ultrawide ZTE and optimized mechanical properties in the negative thermal expansion(NTE)Er2Fe17 ferrimagnet by boron microalloying.By introducing excess boron,the NTE 2:14:1 phase and the positive thermal expansion(PTE)α-Fe gradually precipitate in the 2:17 matrix.The NTE of the 2:14:1 and 2:17 phases over different temperature ranges and the PTE of theα-Fe phase are mutually compensated,resulting in a wide axial ZTE(α1=-1.1×10-6 K-1,120-300 K;α1=2.2×10-6 K-1,300-520 K).Meanwhile,boron microalloying brings about finely-dispersedα-Fe and significantly reduces the grain size.Through grain refinement and precipitation,a high compressive stress of 1051 MPa is achieved,overcoming the intrinsic brittleness of the Er2Fe17 compound.Our work provides a feasible method for designing high-performance NTE/ZTE materials. 展开更多
关键词 Zero thermal expansion Er2Fe17-based intermetallics Magnetic properties Mechanical properties Grain refining Rare earths
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考虑纳米SiO2颗粒作用的Cu-SiO2-Cu接触界面摩擦性能研究 认领 引用
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作者 马金兰 张肖 +2 位作者 佟瑞庭 张皓宸 张润成 《表面技术》 EI CAS CSCD 北大核心 2026年第13期99-110,共12页
目的为揭示空间尘埃环境纳米SiO2颗粒侵入软金属接触界面后的摩擦机理,本文系统研究了颗粒尺寸、形貌等因素对接触界面摩擦行为的影响,为空间机构Cu润滑膜的设计与防护提供理论依据。方法采用分子动力学方法构建Cu-SiO2-Cu三体纳... 目的为揭示空间尘埃环境纳米SiO2颗粒侵入软金属接触界面后的摩擦机理,本文系统研究了颗粒尺寸、形貌等因素对接触界面摩擦行为的影响,为空间机构Cu润滑膜的设计与防护提供理论依据。方法采用分子动力学方法构建Cu-SiO2-Cu三体纳米接触模型,将Cu视为比较厚的软金属润滑膜,引入不同形貌的SiO2颗粒,在不同条件下开展研究。结果颗粒尺度对界面摩擦具有显著的尺寸效应,当颗粒半径为1nm时,强黏附与局部变形导致平均摩擦力最高;随着颗粒半径增大至2nm,滚动作用增强,摩擦力降低;当继续增大颗粒尺寸时,接触面积增大、滚动被抑制,摩擦力开始回升。下压深度增加会导致接触区塑性变形与犁削作用增强,使摩擦力大幅度上升。滑动速度对摩擦力的影响表现出先减小后增大的特征。相较于光滑球形颗粒,具有表面凸起的近球形颗粒在接触表面会产生更强的应力集中与犁沟效应,并伴随温度急剧上升,导致摩擦水平进一步增加。结论SiO2颗粒作为第三体时,对于颗粒适中且表面平滑的情况,体系可形成滚-滑混合运动并表现出“纳米轴承效应”;颗粒过小或形貌尖锐时,黏附与犁沟共同主导摩擦,能量耗散加剧;过大尺寸、过大下压深度以及过高滑动速度则通过几何约束、剪切集中和热效应使摩擦力升高。 展开更多
关键词 分子动力学 SiO颗粒 Cu-SiO2-Cu 三体接触 滑动接触
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Enhanced synaptic properties in HfO2-based trilayer memristor by using ZrO2-x oxygen vacancy reservoir layer for neuromorphic computing 认领 引用 被引量：1
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作者 Turgun Boynazarov Joonbong Lee +5 位作者 Hojin Lee Sangwoo Lee Hyunbin Chung Dae Haa Ryu Haider Abbas Taekjib Choi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第24期164-173,共10页
Neuromorphic computing devices leveraging HfO2 and ZrO2 materials have recently garnered significant attention due to their potential for brain-inspired computing systems.In this study,we present a novel trilaye... Neuromorphic computing devices leveraging HfO2 and ZrO2 materials have recently garnered significant attention due to their potential for brain-inspired computing systems.In this study,we present a novel trilayer Pt/HfO2/ZrO2-x/HfO2/TiN memristor,engineered with a ZrO2-x oxygen vacancy reservoir(OVR)layer fabricated via radio frequency(RF)sputtering under controlled oxygen ambient.The incorporation of the ZrO2-x OVR layer enables enhanced resistive switching characteristics,including a high ON/OFF ratio(∼8000),excellent uniformity,robust data retention(>105 s),and multilevel storage capabilities.Furthermore,the memristor demonstrates superior synaptic plasticity with linear long-term potentiation(LTP)and depression(LTD),achieving low non-linearity values of 1.36(LTP)and 0.66(LTD),and a recognition accuracy of 95.3%in an MNIST dataset simulation.The unique properties of the ZrO2-x layer,particularly its ability to act as a dynamic oxygen vacancy reservoir,significantly enhance synaptic performance by stabilizing oxygen vacancy migration.These findings establish the OVR-trilayer memristor as a promising candidate for future neuromorphic computing and high-performance memory applications. 展开更多
关键词 HfO2-based trilayer memristor ZrO2-xoxygen vacancy reservoir Synaptic plasticity Non-volatile memory Neuromorphic computing
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Effect of Mo_2C on electrochemical corrosion behavior of Ti(C,N)-based cermets 认领 引用 被引量：6
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作者 董广彪 熊计 +3 位作者 杨梅 郭智兴 万维财 易成红 《Journal of Central South University》 SCIE EI CAS 2013年第4期851-858,共8页
The electrochemical corrosion behavior of Ti（C,N）-based cermets with different Mo2C additions was investigated in freely aerated 10% H2SO4 and potentiodynamic polarization of all the materials was conducted from -0.... The electrochemical corrosion behavior of Ti（C,N）-based cermets with different Mo2C additions was investigated in freely aerated 10% H2SO4 and potentiodynamic polarization of all the materials was conducted from -0.5 to 1.5 V. There are two passive regions for all polarization curves. The first should be attributed to passive film formation due to Ti（C,N）, while the second may be due to the presence of Ni. Corrosion current density increases with M02C content increasing, from 2.06×10^-3 to 6.70×10^-3 mA/cm2. It is indicated that the corrosion resistance of Ti（C,N）-based cermets decreases with the increase of Mo2C addition. A skeleton of Ti（C,N） gains is observed after dissolution of Ni. The inner rim of cermets, rich in Mo2C, is corroded along with Ni binder and is more serious with the increase of Mo2C content. The secondary carbide Mo2C can be oxidized and dissolved in sulphuric acid. 展开更多
关键词 Ti（C,N）-based cermets Mo2C electrochemical corrosion
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Graphene-supported cobalt nanoparticles used to activate SiO2-based anode for lithium-ion batteries 认领 引用 被引量：2
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作者 Qi An Xiaohong Sun +2 位作者 Ying Na Shu Cai Chunming Zheng 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第3期447-453,共7页
Although SiO2-based anode is a strong competitor to supersede graphite anode for lithium-ion batteries,it still has problems such as low electrochemical activity, enormous loss of active lithium, and serious volume... Although SiO2-based anode is a strong competitor to supersede graphite anode for lithium-ion batteries,it still has problems such as low electrochemical activity, enormous loss of active lithium, and serious volume expansion. In order to solve these problems, we used a graphene network loaded with cobalt metal nanoparticles(rGO-Co) to coat SiO2 porous hollow spheres(SiO2@rGO-Co). The construction of porous hollow structure and graphene network can shorten the lithium-ion(Li+) diffusion distance and enhance the conductivity of the composite, which improves the electrochemical activity of SiO2 effectively. They also alleviate the volume expansion of the anode in the cycling process. Moreover,nano-scale cobalt metal particles dispersed on graphene catalyze the conversion reaction of SiO2 and activate the locked Li+in Li2O through a reversible reaction, which improves the charge and discharge capacity of the anode. The capacity of SiO2@rGO-Co reaches 370.4 m Ah/g after 100 cycles at 0.1 A/g,which is 6.19 times the capacity of pure SiO2(59.8 mAh/g) under the same circumstance. What is more,its structure also exhibits excellent cycle stability, with a volume expansion rate of only 13.0% after 100 cycles at a current density of 0.1 A/g. 展开更多
关键词 Lithium-ion batteries SiO2-based anode Graphene network Co nanoparticles Electrochemical activity
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丝胶蛋白/SiO2纳米复合溶胶对芳纶服用性能的影响 认领 引用
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作者 田恬 尉霞 +3 位作者 康青青 罗璟娴 王庆博 刘阳 《纺织科技进展》 CAS 2026年第1期27-30,共4页
为解决芳纶织物服用性能不足的问题,制备丝胶蛋白/SiO2纳米复合溶胶并将其整理到间位芳纶上,研制出不同复合溶胶的织物试样,并探究复合溶胶浓度对芳纶织物服用性能的影响。结果表明,当复合溶胶浓度为4%时,整理后织物的各项性能较好。在... 为解决芳纶织物服用性能不足的问题,制备丝胶蛋白/SiO2纳米复合溶胶并将其整理到间位芳纶上,研制出不同复合溶胶的织物试样,并探究复合溶胶浓度对芳纶织物服用性能的影响。结果表明,当复合溶胶浓度为4%时,整理后织物的各项性能较好。在最优整理条件(浓度4%)下,间位芳纶的回潮率、导湿性、抗静电性及透湿性均有所改善,而透气性略微下降,总体而言,芳纶织物的服用性能得到改善。 展开更多
关键词 丝胶蛋白/SiO2纳米复合溶胶 间位芳纶 服用性能
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