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Regulation of Oxygen Vacancies in High Entropy Oxides With Multi-Layer Eggshell Architectural Framework for Boosting the Electrochemical Performance of Supercapacitors 认领 引用
1
作者 Shunxiang Wang Cuili Xiang +3 位作者 Yongjin Zou Zexuan Yang Lixian Sun Hein-Bernhard Kraatz 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2026年第3期403-412,共10页
High-entropy oxides(HEOs)exhibit great potential as supercapacitor electrode materials,but their practical application is hindered by inherent challenges such as structural instability,insufficient conductivity,and di... High-entropy oxides(HEOs)exhibit great potential as supercapacitor electrode materials,but their practical application is hindered by inherent challenges such as structural instability,insufficient conductivity,and difficulties in regulating oxygen vacancies.To overcome these limitations,we present a dual-defect engineering strategy:tailoring the elemental composition of FeZnCuCoNi-based HEOs to generate abundant oxygen vacancies,and constructing a hierarchical,3D multi-shell porous network structure via an in situ template method.Density functional theory calculations reveal that high-entropy lattice distortion significantly enhances oxygen vacancy concentration while reducing charge transfer barriers.Additionally,the multi-layered eggshell morphology creates interconnected ion diffusion pathways,shortens ion transport distances,and reinforces mechanical integrity.The optimized HEO electrode demonstrates remarkable electrochemical performance,achieving a specific capacitance of 641 F g⁻¹at 1 A g⁻¹,with a 92% electric double-layer contribution at 50 mV s⁻¹.The assembled asymmetric supercapacitor delivers an energy density of 36.7 Wh kg⁻¹ at a power density of 800 W kg⁻¹,while maintaining 92% of its initial capacity after 10000 charge-discharge cycles.Mechanistic studies indicate that oxygen vacancies optimize hydroxyl adsorption kinetics,facilitating surface charge transfer,while the hierarchical porous structure effectively mitigates volumetric expansion stress via a 3D ion transport network.This work offers a strategic framework for designing next-generation high-entropy energy storage materials by providing a synergy between atomic-scale electronic tuning and mesoscale structural design. 展开更多
关键词 high-entropy oxides multi-layered eggshell structures oxygen vacancies supercapacitors
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Correction:Alternative Strategy for Development of Dielectric Calcium Copper Titanate-Based Electrolytes for Low-Temperature Solid Oxide Fuel Cells 认领 引用
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作者 Sajid Rauf Muhammad Bilal Hanif +8 位作者 Zuhra Tayyab Matej Veis M.A.K.Yousaf Shah Naveed Mushtaq Dmitry Medvedev Yibin Tian Chen Xia Martin Motola Bin Zhu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第7期427-434,共8页
Correction to:Nano-Micro Letters(2025)17:13 http://gffzzd3cc09b8251d45dfs9oukokqb95xk6o0w.ffgz.tsg.suse.edu.cn/10.1007/s40820-024-01523-0 Following publication of the original article[1],some errors were identified by the authors,which were not observed during proof r... Correction to:Nano-Micro Letters(2025)17:13 http://gffzzd3cc09b8251d45dfs9oukokqb95xk6o0w.ffgz.tsg.suse.edu.cn/10.1007/s40820-024-01523-0 Following publication of the original article[1],some errors were identified by the authors,which were not observed during proof reading.·The authors have added additional scale values even in the presence of measured(real)scale bar and line resolution on SEM images to make them obvious on the real(raw)images presented in Fig.3(g-i)and similarly,in Fig.S7.However,they would like to have SEM images only with measured(real)scale bar and line resolution on real(raw)images in Fig.3(g-i)and Fig.S7 in order not to mislead the scientific society and the young researchers in this field. 展开更多
关键词 sem images dielectric electrolytes line resolution low temperature solid oxide fuel cells scale bar scale values proof reading calcium copper titanate
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Effect of ultra-thin surface oxide on corrosion behavior of a Cr-Si alloyed press-hardened steel 认领 引用
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作者 Yi Xie Zhao Li +1 位作者 Ling-Yu Wang Wei Xu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期1-14,共14页
Coating-free press-hardened steel(CF-PHS)had effectively tackled the challenge of high-temperature oxidation during processing through Cr-Si alloying strategy.However,it is equally essential to investigate its corrosi... Coating-free press-hardened steel(CF-PHS)had effectively tackled the challenge of high-temperature oxidation during processing through Cr-Si alloying strategy.However,it is equally essential to investigate its corrosion resistance and the role of the oxide scale in corrosion environments.The corrosion resistance of CF-PHS with and without oxide scale was comprehensively evaluated by analyzing electrochemical processes and corrosion products,as well as characterizing the corroded oxide scale features,while comparing it with commercial 22MnB5 steel.The results indicate that CF-PHS exhibits superior corrosion resistance compared to 22MnB5 steel and the presence of oxide scale may have a negative influence on short-time corrosion resistance.The ultra-thin oxide scale is unable to effectively and timely mitigate pit propagation during the rapid electrochemical tests.Conversely,during the prolonged corrosion process,the oxide scale can still function as the physical barrier to provide protective effects,making the corrosion process develop more slowly and evenly. 展开更多
关键词 Coating-free press-hardened steel Oxide scale Corrosion resistance High-temperature oxidation Pitting corrosion
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Low-angle grain boundary scale enabling super oxidation resistance 认领 引用 被引量：1
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作者 Kai-Yu Guo Guo-Hui Meng +3 位作者 Wen-Jing Wang Lin Chen Hong Liu Guan-Jun Yang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第35期1-12,共12页
Al2O3scale-forming materials are highly desirable for high-temperature oxidation resistance,and the for-mation of α-Al2O3scales with low-angle grain boundaries(LAGBs)will increase their service lifetime.H... Al2O3scale-forming materials are highly desirable for high-temperature oxidation resistance,and the for-mation of α-Al2O3scales with low-angle grain boundaries(LAGBs)will increase their service lifetime.However,the synthesis of LAGBs is a considerable challenge.Herein,a novel methodology for engineering in situ α-Al2O3with LAGBs is designed,capitalizing on preferential nucleation.This approach employs a dual-stage preoxidation process,initiating with the selective nucleation of α-Al2O3under extremely low oxygen partial pressures,followed by the growth of these nuclei into a dense,protective oxide layer un-der marginally higher oxygen partial pressures.Based on this method,an α-Al2O3film with LAGBs is finally obtained,which significantly improves the oxidation resistance.This study not only paves the way for advanced materials to improve durability in high-temperature environments but also provides novel insight into the mechanisms of α-Al2O3film formation and growth under controlled oxidative conditions. 展开更多
关键词 High-temperature oxidation Low-angle grain boundaries α-Al2O3scale Preoxidation
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Oxide Scale Growth on High Carbon Steel at High Temperatures 认领 引用 被引量：16
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作者 HU Xian-jun ZHANG Bi-ming +2 位作者 CHEN Shao-hui FANG Feng JIANG Jian-qing 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2013年第1期47-52,共6页
The structure and formation process of oxidation on high carbon steel were investigated with the aid of X-ray diffraction （XRD）, scanning electron microscope （SEM） and Laser Raman spectroscopy （LRS）. The oxide s... The structure and formation process of oxidation on high carbon steel were investigated with the aid of X-ray diffraction （XRD）, scanning electron microscope （SEM） and Laser Raman spectroscopy （LRS）. The oxide scale formed comprised a three-layer structure, similar to that formed on pure iron and low-carbon steel. For the high carbon steel, however, the scale was essentially a two-layered because of the low proportion of hematite （Fe2O3） formed. The scale thickness increased with the temperature and time of oxidation. The rate of scale thickening rapidly increased above 900 ℃, at which the rate was particularly fast in the first 20 s of oxidation. The proportion of wüstite （Fe1-yO） increased with time and temperature of oxidation, while the magnetite （Fe3O4） remained constant at about 2 μm. 展开更多
关键词 oxide scale high carbon steel thickness phase constitution
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Reduction of Oxide Scale with Hydrogen 认领 引用 被引量：11
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作者 Xiao-jiang LIU Guang-ming CAO +2 位作者 Yong-quan HE Ming YANG Zhen-yu LIU 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2014年第1期24-29,共6页
During hot rolling process metals will inevitably oxidize because of high temperature and air condition. In order to guarantee the surface quality, acid pickling is applied to remove the oxide scale while waste acid w... During hot rolling process metals will inevitably oxidize because of high temperature and air condition. In order to guarantee the surface quality, acid pickling is applied to remove the oxide scale while waste acid will do harm to the environment. Faced with the problem, by means of reduction process of hot-rolled plates, the oxide scale will be reduced to iron, so that acid pickling is unnecessary. One pass cold rolling procedure was applied. The compres- sion ratios of hot-rolled plates with oxide scale were 10%, 18%, 26% and 31%, respectively. After that, samples mentioned above including a sample without deformation were separately reduced under hydrogen atmosphere condi- tion （5 % H2 ＋95 % Ar in volume percent） at 600-1 000 ℃. The thermal gravimetric apparatus （TGA） was used to establish accurate experimental condition and obtain complete mass loss data. Field emission electron probe microa- nalysis （EPMA） was applied to analyze scale morphology change and composition distribution through the oxide scale. It was found that the sample with 26% compression ratio could be reduced completely at 900 ℃which was favorable to galvanization. 展开更多
关键词 oxide scale pickling free reduction hydrogen cold rolling
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Influences of Alloying Elements on Oxidation Behavior of Steels and Microstructure of Oxide Scales 认领 引用 被引量：6
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作者 Hui-bin WU Di WANG +3 位作者 Peng-cheng ZHANG Jin-ming LIANG Sheng LIU Di TANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第3期231-237,共7页
In order to figure out the oxidation behavior of steels during heating,five micro-alloyed steels were subjected to continuous and isothermal oxidation using the thermo gravimetric analyzer and the Gleeble-3500thermo-m... In order to figure out the oxidation behavior of steels during heating,five micro-alloyed steels were subjected to continuous and isothermal oxidation using the thermo gravimetric analyzer and the Gleeble-3500thermo-mechanical simulator.The microstructure of oxide scales,especially the thickness fractions of Fe2O3,Fe3O4 and FeO layers,was analyzed using the scanning electron microscope（SEM）,electron probe microanalyzer（EPMA）and electron backscattered diffraction（EBSD）techniques.The micro-alloyed steels containing alloying elements（Si,Cr,Ni and Cu）show a higher oxidation resistance compared with the low carbon steel.It is found that alloying elements accumulated at scale/substrate interface during high temperature oxidation.Alloying elements function in two ways in the oxidation of steels：one is enhancing the scale/substrate interface and consequently suppressing the blister of scales;and the other is impeding the outward diffusion of iron cations from substrate to scales,resulting in the decrease of oxidation rate.As the diffusion of iron cations is impeded,the thickness fractions of Fe2O3 and Fe3O4of micro-alloyed steels are more than those of low carbon steels. 展开更多
关键词 micro-alloyed steel high temperature oxidation oxidation kinetics microstructure oxide scale
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Effects of Coiling Temperature and Cooling Condition on Transformation Behavior of Tertiary Oxide Scale 认领 引用 被引量：6
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作者 Guang-ming CAO Teng-zhi WU +3 位作者 Rong XU Zhi-feng LI Fu-xiang WANG Zhen-yu LIU 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2015年第10期892-896,共5页
The influences of coiling temperature and cooling condition on structural transformation of the hot-rolled tertiary oxide scale formed under continuous cooling conditions were studied by thermal gravimetric analyzer. ... The influences of coiling temperature and cooling condition on structural transformation of the hot-rolled tertiary oxide scale formed under continuous cooling conditions were studied by thermal gravimetric analyzer. The fourth oxide scale formed under different conditions were classified and plotted. Because the oxide scale structure transformation is diffusion-controlled and the transformation law is similar to ＂C＂ curve, the eutectoid transformation nose temperature is 450 ℃. Under condition of low temperature and high cooling rate, ion diffusion behavior is restricted so that the eutectoid reaction is suppressed, resulting in that the fourth oxide scale is mainly made up of pre-eutectoid Fe304 and FeO without eu- tectoid products. From scale structure transition diagram, the eutectoid reaction process was affected by coiling temperature and cooling rate, leading to various scale structures. 展开更多
关键词 oxide scale eutectoid transformation continuous cooling coiling temperature cooling rate
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Hot-dip Galvanizing of Carbon Steel after Cold Rolling with Oxide Scale and Hydrogen Descaling 认领 引用 被引量：4
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作者 Yong-quan HE Tao JIA +3 位作者 Xiao-jiang LIU Guang-ming CAO Zhen-yu LIU Jun LI 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2014年第2期222-226,共5页
A new processing method for producing hot dip galvanized steel is designed and tested, in which pickling is skipped. Hot-rolled low carbon steel sheets are roiled with oxide scale in an experimental mill at room tempe... A new processing method for producing hot dip galvanized steel is designed and tested, in which pickling is skipped. Hot-rolled low carbon steel sheets are roiled with oxide scale in an experimental mill at room temperature, prior to annealing under a 20% hydrogen reducing atmosphere and galvanizing on a hot-dip galvanizing simulator. Micro-cracks formed in the oxide scale during cold rolling roughen the steel surface and enlarge the specific surface. Through-thickness cracks provide transport channels for hydrogen, and hence the reduction of oxide scale is en- hanced. When the sheet is dipped in the zinc bath, cracks are submerged by liquated zinc and the defects are not dis- tinct after hot-dip galvanizing. The overlay coating occludes with rough surface of the sheet, whereby a superior coat- ing adherence is realized. 展开更多
关键词 oxide scale acid free cleaning cold rolling reducing annealing hot-dip galvanizing
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Dynamic evolution of oxide scale on the surfaces of feed stock particles from cracking and segmenting to peel-off while cold spraying copper powder having a high oxygen content 认领 引用 被引量：4
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作者 Xiao-Tao Luo Yi Ge +5 位作者 Yingchun Xie Yingkang Wei Renzhong Huang Ninshu Ma Chidambaram Seshadri Ramachandran Chang-Jiu Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第8期105-115,共11页
The oxide scale present on the feedstock particles is critical for inter-particle bond formation in the cold spray(CS)coating process,therefore,oxide scale break-up is a prerequisite for clean metallic contact which g... The oxide scale present on the feedstock particles is critical for inter-particle bond formation in the cold spray(CS)coating process,therefore,oxide scale break-up is a prerequisite for clean metallic contact which greatly improves the quality of inter-particle bonding within the deposited coating.In general,a spray powder which contains a thicker oxide scale on its surface(i.e.,powders having high oxygen content)requires a higher critical particle velocity for coating formation,which also lowers the deposition efficiency(DE)making the whole process a challenging task.In this work,it is reported for the first time that an artificially oxidized copper(Cu)powder containing a high oxygen content of 0.81 wt.%with a thick surface oxide scale of 0.71μm.,can help achieve an astonishing increment in DE.A transition of surficial oxide scale evolution starting with crack initiations followed by segmenting to peeling-off was observed during the high velocity particle impact of the particles,which helps in achieving an astounding increment in DE.Single-particle deposit observations revealed that the thick oxide scale peels off from most of the sprayed powder surfaces during the high-velocity impact,which leaves a clean metallic surface on the deposited particle.This makes the successive particles to bond easily and thus leads to a higher DE.Further,owning to the peeling-off of the oxide scale from the feedstock particles,very few discontinuous oxide scale segments are retained at inter-particle boundaries ensuring a high electrical conductivity within the resulting deposit.Dependency of the oxide scale threshold thickness for peeling-off during the high velocity particle impact was also investigated. 展开更多
关键词 Cold spray Deposition efficiency Oxide scale fragmentation Inter-particle bonding Electrical conductivity
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Influence of oxide scales on the corrosion behaviors of B510L hot-rolled steel strips 认领 引用 被引量：7
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作者 Cheng Man Chao-fang Dong +3 位作者 Hui-bin Xue Kui Xiao Xiao-gang Li Hui-bin Qi 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第7期769-778,共10页
The influence of oxide scales on the corrosion behaviors of B510 L hot-rolled steel strips was investigated in this study. Focused ion beams and scanning electron microscopy were used to observe the morphologies of ox... The influence of oxide scales on the corrosion behaviors of B510 L hot-rolled steel strips was investigated in this study. Focused ion beams and scanning electron microscopy were used to observe the morphologies of oxide scales on the surface and cross sections of the hot-rolled steel. Raman spectroscopy and X-ray diffraction were used for the phase analysis of the oxide scales and corrosion products. The corrosion potential and impedance were measured by anodic polarization and electrochemical impedance spectroscopy. According to the results, oxide scales on the hot-rolled strips mainly comprise iron and iron oxides. The correlation between mass gain and test time follows a power exponential rule in the damp-heat test. The corrosion products are found to be mainly composed of γ-Fe OOH, Fe3O4, ？-Fe OOH, and γ-Fe2O3. The contents of the corrosion products are different on the surfaces of the steels with and without oxide scales. The steel with oxide scales is found to show a higher corrosion resistance and lower corrosion rate. 展开更多
关键词 strip steel hot rolling focused ion beams Raman spectroscopy oxide scale corrosion
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Effects of composite oxide scale on oxidation resistance of superalloy K273 认领 引用 被引量：2
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作者 Wang Haitao Tan Jiwen +1 位作者 Chu Zhong Yu Huashun 《China Foundry》 SCIE CAS 2012年第2期165-170,共6页
A Si-containing K273 superalloy was made using intermediate frequency induction furnace in the study. In the testing of oxidation resistance, the oxidation process of the alloy specimens during the testing at 900℃ fo... A Si-containing K273 superalloy was made using intermediate frequency induction furnace in the study. In the testing of oxidation resistance, the oxidation process of the alloy specimens during the testing at 900℃ for 500 h was examined by oxidation weight gain method. The morphology and composition of the oxide scales were determined using scanning electron microscope （SEM） and X-ray diffraction （XRD）, respectively. The effects of the transferring of ions and electrons on the oxidation resistance were further analyzed microscopically by semiconductor oxide models. The results show that the composite oxide scales consist of Cr203, SiO2 and spinel- type oxide MCr204, with flat and compact structure, and fine grains in uniform distribution. All of these endow the superalloy K273 with strong oxidation resistance. The reason for the powerful oxidation resistance of the composite scale is that the formation process of P＋N type semiconductor oxide enables to consume most of the surplus negative and positive ions in the oxide scales, which makes the number of the mobile ions and electrons dropped enormously, and the transfer rate of them falls heavily. So the oxidation rate of the metal phase in the alloy matrix is reduced significantly. 展开更多
关键词 superalloy silicon oxide scale oxidation resistance
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Growth Rate,Microstructure and Phase Composition of Oxide Scales for Three Typical Steels in Simulated Continuous Casting Process 认领 引用 被引量：1
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作者 Nan WANG Jian-hong DONG +2 位作者 Wei-jun HUANG Bo LI Min CHEN 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2014年第12期1065-1072,共8页
C-rowth rate, microstructure and phase composition of scale layer formed during oxidation in 56 % H2O9%O2 N2 and following continuous cooling in ambient air were experimentally investigated by means of optical microsc... C-rowth rate, microstructure and phase composition of scale layer formed during oxidation in 56 % H2O9%O2 N2 and following continuous cooling in ambient air were experimentally investigated by means of optical microscopy, scanning electron microscopy （SEM）, energy-dispersive spectroscopy （EDS） and X-ray diffraction （XRD） for 45, 20CrMnTi and TTS443M steels respectively, to examine the effects of strand surface temperature and steel composition on the scale formation in simulated continudus casting process. The growth rates were found to be ap proximately parabolic and the calculated activation energy of TTS443M steel is much higher than those of the two other steels. For 45 and 20CrMnTi steels, the scale layers were looser and a distinct gap formed at the scale-sub strate interface at higher strand surface temperature. The dominant phases within the scale were iron oxides except for FeO · Cr2O3 phase simuhaneously existing in the oxide scale of 20CrMnTi steel. On the other hand, the scale layer formed on TTS443M steel was compact and tightly attached to the steel surface. At both lower and higher strand surface temperature, iron oxide was main phase in external layer of the scale, while chromia was dominant in inner layer with an appreciable Cr enrichment. 展开更多
关键词 oxide scale growth rate microstructure phase composition continuous casting
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Influence of Cr_2O3-Al_2O3Composite Oxide Scale on Oxidation Resistance of ZG40Cr24 认领 引用 被引量：3
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作者 WANG Haitao JIANG Peigang HUANG Liping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第3期405-410,共6页
Test alloys ZG40Cr24 with alloying of 3 wt%aluminium were cast by intermediate frequency induction furnace.The oxidation resistance of test alloys at 1000℃for 500 hours was examined according to oxidation weight gain... Test alloys ZG40Cr24 with alloying of 3 wt%aluminium were cast by intermediate frequency induction furnace.The oxidation resistance of test alloys at 1000℃for 500 hours was examined according to oxidation weight gain method.The scale morphology and composition were studied using scanning electron microscope(SEM)and X-ray diffraction(XRD)respectively.By energy dispersive spectroscopy(EDS)studies,a kind of composite oxide scale compounded highly by Cr2O3,Al2O3 and spinel MCr2O4 in molecule scale came into being at high temperature.With flat and compact structure,fine and even grains,such composite scale granted complete oxidation resistance to alloy ZG40Cr24.The oxidation resistance mechanism was studied deeply in electrochemistry corrosion.The P+N semiconductor composite scale composed plenty of inner PN junctions,of which the unilateral conductive and the out-of-order arrangement endowed itself insulating in all directions.The positive and negative charges in scale could not move,and the mobile number and transferring rate of them both dropped enormously,as a result,the oxidation rate of the matrix metal was cut down greatly.So the composite scale presented excellent oxidation resistance. 展开更多
关键词 oxide scale oxidation resistance Cr2O3 Al2O3 semiconductor
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Effect of oxide scale on corrosion behavior of HP-13Cr stainless steel during well completion process 认领 引用 被引量：2
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作者 Wenlong Qi Jidong Wang +7 位作者 Xuanpeng Li Yanan Cui Yang Zhao Junfeng Xie Guanxin Zeng Qiuying Gao Tao Zhang Fuhui Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第5期153-164,共12页
The well completion process in oil and gas industry,aiming to build effective exploitation,is divided into acidizing and formation water production process.Oxide scale(OS)formed on the inner wall of the HP-13Cr stainl... The well completion process in oil and gas industry,aiming to build effective exploitation,is divided into acidizing and formation water production process.Oxide scale(OS)formed on the inner wall of the HP-13Cr stainless steel tubes during the hot extrusion process changes the surface roughness.The effects of OS on the corrosion of HP-13Cr stainless steel during well completion process were studied by corrosion measurement,spectra analysis,microscopic observation and numerical simulation.The results indicate that the OS make no change of phase distribution and element composition of corrosion scale,while the increasing OS roughness is the dominant factor for accelerating corrosion rate during the well completion process.In acidizing process,the greater surface roughness OS of HP-13Cr stainless steel increases the corrosion rate obviously due to a larger interfacial area in contact with the aggressive environment.During subsequent formation water production process,the turbulence eddy,formed at locations characterized with greater surface roughness OS,can deteriorate the corrosion scale and accelerate the mass transfer of the corrosive species,resulting in more serious corrosion. 展开更多
关键词 Stainless steel Oxide scale Roughness Interfacial area Turbulence eddy
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Thin Film of Perovskite Oxide with Atomic Scale p-n Junctions 认领 引用 被引量：1
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作者 HU Bin HUANG Ke-ke +3 位作者 HOU Chang-min YUAN Hong-ming PANG Guang-sheng FENG Shou-hua 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第3期379-381,共3页
Thin films of perovskite manganese oxide Lao.66Ca0.29K0.05MnO3（LCKMO） on Au/ITO（ITO=indium tin oxide） substrates were prepared by off-axis radio frequency magnetron sputtering and characterized by X-ray diffrac- t... Thin films of perovskite manganese oxide Lao.66Ca0.29K0.05MnO3（LCKMO） on Au/ITO（ITO=indium tin oxide） substrates were prepared by off-axis radio frequency magnetron sputtering and characterized by X-ray diffrac- tion（XRD）, high-resolution transmission electron microscopy（HRTEM）, and conductive atomic force microscopy （C-AFM） at room temperature. The thin films with thickness ranged from 100 nm to 300 nm basically show cubic structures with a=0.3886 nm, the same as that of the raw material used, but the structures are highly modulated. C-AFM results revealed that the atomic scale p-n junction feature of the thin films was the same as that of the single crystals. The preparation of the thin films thus further confirms the possibility of their application extending from micrometer-sized single crystals to macroscopic thin film. 展开更多
关键词 Perovskite oxide Thin film Atomic scale p-n junction
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Improvement to anti-rust property of hot rolled rebar by compact oxide scale 认领 引用 被引量：2
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作者 CHEN Qing-an LIU Li-zhong +1 位作者 LIU Xin LIU Xiang-hua 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第12期2813-2818,共6页
A method was proposed to improve the anti-rust property of hot rolled rebar, which uses oil–water emulsion cooling instead of water cooling after hot rolling. The experiments were carried out by two cooling methods, ... A method was proposed to improve the anti-rust property of hot rolled rebar, which uses oil–water emulsion cooling instead of water cooling after hot rolling. The experiments were carried out by two cooling methods, one cooled by water, the other cooled by oil–water emulsion. The results of wet/dry cyclic accelerated corrosion test showed that the anti-rust property of rebar cooled by oil–water emulsion was better than that by water obviously. The results of OM, SEM and EPMA analysis indicated that these two scales contained three layers: an outer Fe_3O_4 layer, an intermediate Fe O layer with island-shaped pro-eutectoid Fe_3O_4, an inner eutectoid Fe_3O_4 layer. For the water cooled rebar, all three layers of oxide scale were relatively thin. Moreover, the scale had plenty of defects such as porosity, and crack. However, for the oil–water emulsion cooled rebar, all three layers of oxide scale were relatively thick and compact, which played an important role in protecting the rebar from atmospheric rust. 展开更多
关键词 hot rolled rebar anti-rust property compact oxide scale oil–water emulsion cooling
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Theoretical consideration on composite oxide scales and coatings 认领 引用 被引量：1
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作者 何业东 高唯 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第5期435-440,共6页
The present paper discussed some fundamental aspects on composite oxide scales and coatings for protection of alloys from high temperature oxidation, the related thermodynamic conditions, special mechanical characteri... The present paper discussed some fundamental aspects on composite oxide scales and coatings for protection of alloys from high temperature oxidation, the related thermodynamic conditions, special mechanical characteristics and a sealing mechanism. It was proposed that the oxide scales and coatings with a composite structure should possess superior mechanical properties than that with a single phase oxide. It also showed that the A1203 scales or coatings doped with 3（203 and ZrO2 （or YSZ）-A1203 composite coatings possessed superior properties at high temperatures. In such composite oxide scales and coatings, the fracture resistance of the scales was increased by the toughening effect, the thermal stress was decreased owing to the increase of thermal-expansion coefficients, and A1203 phase could seal the alloy substrate well In addition, the kinetic equation of thermal growth oxide on alloy covered with composite oxide coatings was derived. 展开更多
关键词 rare earth oxides composite oxide scales composite oxide coatings high-temperature oxidation of alloys
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Effect of Hot-Rolled Oxide Scale on Dry/ Wet Cyclic Corrosion Behavior of Q370qNH Steel in Simulated Industrial Atmosphere Environment 认领 引用 被引量：1
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作者 REN Yuxia GUO Tieming +4 位作者 XU Xiujie LI Guangming TANG Jian NAN Xueli JIA Jiangang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第6期1216-1227,共12页
The corrosion behavior of Q370qNH steel in the presence and absence of hot-rolled oxide scale in simulated industrial atmospheric environment was studied by dry/wet cycle accelerated corrosion experiments.The experime... The corrosion behavior of Q370qNH steel in the presence and absence of hot-rolled oxide scale in simulated industrial atmospheric environment was studied by dry/wet cycle accelerated corrosion experiments.The experimental results show that the corrosion type of bare steel is uneven overall corrosion and large size pitting corrosion in small areas;that of oxide scale sample is local dissolution corrosion and small size pitting corrosion in large areas,and corrosion rate is much smaller than that of bare steel.The corrosion products of both steels are composed ofα-FeOOH,γ-FeOOH,Fe2O3,and Fe3O4,but the formation mechanism is different.The bare steel generatesα-FeOOH andγ-FeOOH through“acid regeneration cycle mechanism”;the oxide scale sample generates hydroxides mainly through the gradual dissolution of the oxide film,and then through“the acid regeneration cycle mechanism”.With the extension of corrosion time,the electrochemical stability of the sample with oxide scale increases,but the change of tafel curve of bare steel sample is not obvious.In simulated industrial atmosphere,the existence of hot-rolled oxide scale can facilitate the formation of dense rust layer on the surface of Q370qNH steel,which is more protective than bare steel. 展开更多
关键词 Q370qNH steel oxide scale NaHSO3 corrosion behavior
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Morphology of Oxide Scale and Oxidation Kinetics of Low Carbon Steel 认领 引用 被引量：20
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作者 Guang-ming CAO Xiao-jiang LIU +1 位作者 Bin SUN Zhen-yu LIU 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2014年第3期335-341,共7页
The oxidation kinetics and composition of oxide scales on low carbon steel （SPHC） were studied during i- sothermal oxidation. Thermogravimetric analyzer （TGA） was used to simulate isothermal oxidation process of S... The oxidation kinetics and composition of oxide scales on low carbon steel （SPHC） were studied during i- sothermal oxidation. Thermogravimetric analyzer （TGA） was used to simulate isothermal oxidation process of SPHC for 240 min under air condition, and the temperature range was from 500 to 900 ℃. Scanning electron microscope （SEM） was used to observe cross-sectional scale morphology and analyze composition distribution of oxide scales. The morphology of oxide scale was classical three-layer structure. Fe2 03 developed as whiskers at the outermost lay- er, and interlayer was perforated-plate Fe3 04 while innermost layer was pyramidal FeO. From the oxidation curves, the oxidation mass gain per unit area with time was of parabolic relation and oxidation rate slowed down. On the ba- sis of experimental data, the isothermal oxidation kinetics model was derived and oxidation activation energy of SPHC steel was 127. 416 kJ/mol calculated from kinetics data. 展开更多
关键词 oxide scale~ morphology~ activation energy of oxidatiom＇ oxidation kinetics model~ low carbon steel
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