检索结果-南通市图书馆

Journal of Rare Earths 2024年第2期42卷 409-414,I0006页

作者： Yanyan Zhao Xu Sun Deliang Meng Xiangsheng Liu Qiang Zhong Zongyu Feng National Engineering Research Center for Rare Earth Grirem Advanced Materials Co.Ltd.Beijing0088China Rare Earth Functional materials(Xiong'an)Innovation Center co. Ltd.Xiongan071700China General Research Institute for Nonferrous Metals Beijing100088China

To find a greener and more eco.omical approach for treating the Mountain Pass rare earth co.centrate(MPREC),a novel "co.bination Method",including the processes of oxidizing roasting,HCI leaching and sulfuric acid roasting,is proposed in this *** this paper,the effect of phase transition behavior in hydrochloric acid leaching during oxidative roasting at 450-600℃ was *** roasting,the bastnasite in MPREC is deco.posed into CeLa_(2)O_(3)F_(3) and(Ce_(0.33),La_(0.33),Ca_(0.33))O_(1.5).As the CeLa_(2)O_(3)F_(3) phase has the fluorine-fixation effect,the generated CeLa_(2)O_(3)F_(3) phase can not be dissolved by HCI after roasting at 500 and 550℃,but it can be deco.posed by HCI after roasting at over 600℃,resulting in the improvement of the leaching rate of total F *** maximum leaching efficiency of rare earth elements(REEs) can reach 70.32 wt% at the roasting temperature of 550℃.After roasting at over 600℃,some F^-ions in the solution co.bined with RE^(3+) to form REF_(3) precipitate and enter the leaching residue,and the others are in the form of [CeF_(3)]^+ in the leaching solution during leaching,therefore,the leaching efficiency of non-ce rium REEs decreases while that of cerium element *** work provides basic research for optimizing the actual production process of MPREC.

关键词： Mountain pass rare earth mine Roasting Phase change Rare earths

Occurrence and vertical distribution of aluminum and rare earths in weathered crust elution-deposited rare earth ore:Effect of soil solution pH and clay minerals

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第7期42卷 1394-1402,I0007页

作者： Jiaxin Pan Longsheng Zhao Zheng Li Xiaowei Huang Zongyu Feng Jun Chen National Engineering Research Center for Rare Earth China GRINM Group Co.Ltd.Beijing100088China School of Metallurgical and Eco.ogical Engineering University of Science and Technology Beijing(USTB)Beijing100083China GRIREM Hi–Tech co. Ltd.Langfang065201China GRIREM advanced materials co. Ltd.Beijing100088China GRIMAT Engineering Institute co. Ltd.Beijing101407China

Weathered crust elution-deposited rare earth ore is crucial source of medium and heavy rare earths,with in-situ leaching being the most co.mon mining *** high co.tents of impurity of aluminum in the leach solution are a significant challenge for the subsequent enrichment process of rare earths.A co.prehensive understanding of the occurrences and vertical distribution of aluminum and rare earths within typical vertical profiles can provide valuable insights into entire design of the in-situ *** paper improves a five-step sequential extraction method to analyze the occurrence and vertical distribution of rare earths and aluminum in vertical profiles from Chongzuo and *** results demonstrate that soil solution pH is the main factor affecting the vertical distribution of ionexchangeable rare *** samples have distinct areas of enrichment for ion-exchangeable rare earths or ***-exchangeable rare earths are primary co.centrated in the middle and lower parts of the ore layer(4-13 m in Chongzuo,14-22 m in Longyan),while the ion-exchangeable aluminum is mainly enriched in the upper part of the ore layer(1-5 m in Chongzuo,and 2-14 m in Longyan).The vertical distribution of inorganic hydroxy aluminum is likely influenced by the micromorphology and particle size of the clay *** inorganic hydroxy aluminum co.centration in Chongzuo samples decreases co.tinuously from 415.65 to 120.95 mg/kg with increasing sampling depth,whereas the co.centration in Longyan samples(110.55-171.27 mg/kg)is almost independence with sampling *** results provide direct guidance for the entire design of the injection well depth and the leaching parameters,thereby inhibiting the leaching of impurity of aluminum and lower the co.sumption of leaching agent.

关键词： Weathered crust elution-deposited rare earth ore Sequential extraction Occurrence Aluminum Rare earth elements

Inclusions modification by rare earth in steel and the resulting properties: A review

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第3期42卷 431-445,I0001页

作者： Xiaoqiang Wang Zhiwei Wu Bing Li Wenxiong Chen Jun Zhang Jian Mao co.lege of materials Science and Engineering Sichuan UniversityChengdu610065China Chengdu advanced Metal materials Industry technology Research Institute co. Ltd.Chengdu610303China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114009China

Rare earth(RE) elements are excellent modifiers for non-metallic inclusions that inevitably appear in steel and affect steel properties. This paper reviews the research status of inclusions modification by RE elements and the changes it cause on steel properties. First, the inclusion changes caused by RE modification are described. Generally, after adding pure RE, the main evolution of inclusions occurs as M →M + RE-Al-O → RE-Al-O + RE_(2)O_(2)S → RE_(2)O_(2)S + RE—S/RE_(2)O_(2)S + RE-O with an increase in the RE co.tent(M represents the inclusions before RE addition). The type of final inclusion obtained after RE modification is related to the relative co.tents of S and O in the steel. Moreover, fine, regular, and uniformly distributed inclusions can be obtained with appropriate RE addition. However, the effectiveness of inclusions modification by adding both RE and non-RE elements is closely related to the order of their addition. Seco.d, the applications and advantages of thermodynamic calculations in the study of RE-modified inclusions are introduced. Third, the changes in the co.rosion resistance, impact properties,and other properties of steel caused by the modification of inclusions by RE are reviewed. Finally, the perspectives and trends of inclusions modified by RE elements in the steel industry are presented.

关键词： Rare earths Inclusions Modification Thermodynamic calculation Properties change

Enhanced Electrochemical Properties and Optimized Li+ Transmission Pathways of PEO/LLZTO-Based co.posite Electrolytes Modified by Supramolecular co.bination

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental materials 2024年第1期7卷 242-250页

作者： Zhengyi Lu Lin Peng Yi Rong Enli Wang Ruhua Shi Hongxun Yang Yadong Xu Ruizhi Yang Chao Jin co.lege of Energy Soochow Institute for Energy and Materials InnovationsSoochow University Jiangsu Runchao Energy Storage technology co. Ltd

Poly（ethylene oxide）(PEO) and Li6.75La3Zr1.75Ta0.25O12（LLZTO）-based co.posite polymer electrolytes（CPEs） are co.sidered one of the most promising solid electrolyte ***,agglomeration of LLZTO within PEO and lack ... 详细信息

关键词： co.ductivity interfacial stability LLZTO fillers modification PEO matrix

Instrumented oscillographic study on impact toughness of an axle steel DZ2 with different tempering temperatures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and materials 2024年第7期31卷 1590-1598页

作者： Shuo Liu Peng Zhang Bin Wang Kaizhong Wang Zikuan Xu Fangzhong Hu Xin Bai Qiqiang Duan Zhefeng Zhang Shi-changxu Innovation Center for advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China technology Center Ma'anshan Iron and Steel Co.Ltd.Ma'anshan 243000China

co.pared with the co.ventional Charpy impact test method,the oscillographic impact test can help in the behavioral analysis of materials during the fracture *** this study,the trade-off relationship between the strength and toughness of a DZ2 axle steel at various tempering temperatures and the cause of the improvement in impact toughness was *** tempering process dramatically influenced carbide precipitation behavior,which resulted in different aspect ratios of *** toughness improved along with the rise in tempering temperature mainly due to the increase in energy required in impact crack *** characteristics of the impact crack propagation process were studied through a co.prehensive analysis of stress distribution,oscillosco.ic impact statistics,fracture morphology,and carbide *** poor impact toughness of low-tempering-temperature specimens was attributed to the increased number of stress co.centration points caused by carbide morphology in the small plastic zone during the propagation process,which resulted in a mixed distribution of brittle and ductile fractures on the fracture surface.

关键词： axle steel DZ2 tempering process impact toughness oscillographic impact test impact crack propagation carbides

Effect of bipolar-plates design on co.rosion,mass and heat transfer in proton-exchange membrane fuel cells and water electrolyzers:A review

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and materials 2024年第7期31卷 1599-1616页

作者： Jiuhong Zhang Xiejing Luo Yingyu Ding Luqi Chang Chaofang Dong Key Laboratory for co.rosion and Protection(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing advanced Innovation Center for materials Genome Engineering Beijing 100083China

Attaining a decarbonized and sustainable energy system,which is the co.e solution to global energy issues,is accessible through the development of hydrogen ***-exchange membrane water electrolyzers(PEMWEs)are promising devices for hydrogen production,given their high efficiency,rapid responsiveness,and *** plates acco.nt for a relatively high percentage of the total co.t and weight co.pared with other co.ponents of ***,optimization of their design may accelerate the promotion of *** paper reviews the advances in materials and flow-field design for bipolar ***,the working co.ditions of proton-exchange membrane fuel cells(PEMFCs)and PEMWEs are co.pared,including reaction direction,operating temperature,pressure,input/output,and ***,the current research status of bipolar-plate substrates and surface co.tings is summarized,and some typical channel-rib flow fields and porous flow fields are ***,the effects of materials on mass and heat transfer and the possibility of reducing co.rosion by improving the flow field structure are ***,this review discusses the potential directions of the development of bipolar-plate design,including material fabrication,flow-field geometry optimization using threedimensional printing,and surface-co.ting co.position optimization based on co.putational materials science.

关键词： bipolar-plates flow design mass and heat transfer co.rosion water electrolyzers fuel cells

In-situ physical/chemical cross-linked hydrogel electrolyte achieving ultra-stable zinc anode-electrolyte interface towards dendrite-free zinc ion battery

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第10期97卷 342-351页

作者： Chen-Yang Li Jiang-Lin Wang Dong-Ting Zhang Min-Peng Li Hao Chen Wei-Hai Yi Xin-Ying Ren Bao Liu Xue-Feng Lu Mao-Cheng Liu State Key Laboratory of advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology School of materials Science and Engineering Lanzhou University of Technology Chaowei Power Group co. LTD School of Vehicle Engineering Jiangsu University

Hydrogen evolution reaction（HER）,zinc co.rosion,and dendrites growth on zinc metal anode are the major issues limiting the practical applications of zinc-ion ***,an in-situ physical/chemical cross-linked hydrogel electrolyte（carrageenan/polyacrylamide/ZnSO4,denoted as CPZ） has been developed to stabilize the zinc anode-electrolyte interface,which can eliminate side reactions and prevent dendrites *** in-situ CPZ hydrogel electrolyte improves the reversibility of zinc anode due to eliminating side reactions caused by active water ***,the electrostatic interaction between the SO4-groups in CPZ and Zn2+can enco.rage the preferential deposition of zinc atoms on（002） crystal plane,which achieve dendrite-free and homogeneous zinc *** in-situ hydrogel electrolyte offers a streamlined approach to battery manufacturing by allowing for direct integration into the ***,the Zn//Zn half battery with CPZ hydrogel electrolyte can enable an ultra-long cycle over 5500 h at a current density of 0.5 mA cm-2,and the Zn//Cu half battery reach an average co.lombic efficiency of 99.37%.The Zn//V2O5-GO full battery with CPZ hydrogel electrolyte demonstrates94.5% of capacity retention after 2100 *** study is expected to open new thought for the development of co.mercial hydrogel electrolytes for low-co.t and long-life zinc-ion batteries.

关键词： Dendrites growth Hydrogen evolution reaction and zinc co.rosion In-suit CPZ hydrogel electrolyte Zinc anode-electrolyte interface Zn ion batteries

Phase field modeling of grain stability of nanocrystalline alloys by explicitly inco.porating mismatch strain

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3370-3382页

作者： Min Zhou Hong-Hui Wu Yuan Wu Hui Wang Xiong-Jun Liu Sui-He Jiang Xiao-Bin Zhang Zhao-Ping Lu Beijing advanced Innovation Center for materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083Cnina Institute for Carbon Neutrality University of Science and TechnologyBeijing 100083China Institute of materials Intelligent technology Liaoning Academy of MaterialsShenyang 110004China

Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) ***,this high-density characteristic induces grain co.rsening at elevated temperatures,thereby limiting the widespread application of nanocrystalline *** experimental observations revealed that GB segregation and seco.d-phase pinning effectively hinder GB migration,thereby improving the stability of nanocry stalline *** this study,a mouified phase-field model that integrates mismatch strain,solute segregation and precipitation was developed to evaluate the influence of lattice misfit on the thermal stability of nanocrystalline *** simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline *** synergizing precipitation with an appropriate lattice misfit,the formation of seco.d-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the *** co.centrated solute segregation and precipitation at the GBs effectively hinders grain migration,thereby preventing grain *** findings provide a new perspective on the design and regulation of nanocrystalline alloys with enhanced thermal stability.

关键词： Phase field model Mismatch strain Seco.d-phase precipitation Grain boundary segregation Nanocrystalline alloys

Mass Transfer-Promoted Fe^(2+)/Fe^(3+)Circulation Steered by 3D Flow-Through co.Catalyst System Toward Sustainable advanced Oxidation Processes

在线全文

学校读者我要写书评

暂无评论

Engineering 2024年第5期36卷 264-275页

作者： Weiyang Lv Hao Li Jinhui Wang Lixin Wang Zenglong Wu Yuge Wang Wenkai Song Wenkai Cheng Yuyuan Yao National Engineering Lab of Textile Fiber materials and Processing technology(Zhejiang) Zhejiang Sci-Tech UniversityHangzhou 310018China Zhejiang Provincial Innovation Center of advanced Textile technology Shaoxing 312000China Jiangsu Ruiya Stirring technology co. Ltd.Yixing 214200China

Realizing fast and co.tinuous generation of reactive oxygen species(ROSs)via iron-based advanced oxidation processes(AOPs)is significant in the environmental and biological ***,current AOPs assisted by co.catalysts still suffer from the poor mass/electron transfer and non-durable promotion effect,giving rise to the sluggish Fe^(2+)/Fe^(3+)cycle and low dynamic co.centration of Fe^(2+)for ROS ***,we present a three-dimensional(3D)macroscale co.catalyst functionalized with molybdenum disulfide(MoS_(2))to achieve ultra-efficient Fe^(2+)regeneration(equilibrium Fe^(2+)ratio of 82.4%)and remarkable stability(more than 20 cycles)via a circulating flow-through *** the co.ventional batch-type reactor,experiments and co.putational fluid dynamics simulations demonstrate that the optimal utilization of the 3D active area under the flow-through mode,initiated by the co.vectionenhanced mass/charge transfer for Fe^(2+)reduction and then strengthened by MoS_(2)-induced flow rotation for sufficient reactant mixing,is crucial for oxidant activation and subsequent ROS ***,the flow-through co.catalytic system with superwetting capabilities can even tackle the intricate oily wastewater stabilized by different surfactants without the loss of pollutant degradation *** findings highlight an innovative co.catalyst system design to expand the applicability of AOPs based technology,especially in large-scale co.plex wastewater treatment.

关键词： advanced oxidation processes 3D co.catalyst Flow-through mode Enhanced mass transfer co.plex wastewater treatment

Pre-existing orthorhombic embryos-induced hexagonal-orthorhombic martensitic transformation in MnNiSi_(1-x)(co.iGe)_x alloy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第4期33卷 691-699页

作者：张婷婷龚元元鲁子骞徐锋 MIIT Key Laboratory of advanced Metallic and Intermetallic materials technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China

The thermal-elastic martensitic transformation from high-temperature Ni_(2)In-type hexagonal structure to low-temperature TiNiSi-type orthorhombic structure has been widely studied in MnMX(M=Ni or co.and X=Ge or Si)***,the answer to how the orthorhombic martensite nucleates and grows within the hexagonal parent is still *** this work,the hexagonal-orthorhombic martensitic transformation in a co.and Ge co.substituted MnNiSi is *** can find some orthorhombic laths embedded in the hexagonal parent at a temperature above the martensitic transformation start temperature(M_(s)).With the the sample co.ing to M_(s),the laths turn broader,indicating that the martensitic transformation starts from these pre-existing orthorhombic *** observation suggests that these pre-existing orthorhombic laths do not originate from the hexagonal-orthorhombic martensitic transformation because of the difference between atomic occupations of doping elements in the hexagonal parent and those in the preexisting orthorhombic *** phenomenological crystallographic theory and experimental investigations prove that the pre-existing orthorhombic lath and generated orthorhombic martensite have the same crystallography relationship to the hexagonal ***,the orthorhombic martensite can take these pre-existing laths as embryos and grow *** work implies that the martensitic transformation in MnNiSi_(1-x)(co.iGe)_(x) alloy is initiated by orthorhombic embryos.

关键词： martensitic transformation MnMX alloy orthorhombic embryo crystallography relationship