检索结果-内蒙古大学图书馆

Enhanced rate and specific capacity in nanorod-like core-shell crystalline NiMoO_(4)@amorphous cobalt boride materials enabled by Mott-Schottky heterostructure as positive electrode for hybrid supercapacitors

引用

Journal of Energy Chemistry 2023年第10期85卷 276-287,I0009页

作者： Jing-Feng Hou Jian-Fei Gao Ling-Bin Kong State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina

The supercapacitor electrode materials suffer from structure pulverization and sluggish electrode kinetics under high current ***,a unique NiMoO_(4)@Co-B heterostructure composed of highly conductive Co-B nanoflakes and a semiconductive NiMoO_(4) nanorod is designed as an electrode material to exert the energy storage effect on *** formed Mott-Schottky heterostructure is helpful to overcome the ion diffusion barrier and charge transfer resistance during charging and ***,this crystalline-amorphous heterogeneous phase could provide additional ion storage sites and better strain ***,the optimized NiMoO_(4)@Co-B hierarchical nanorods(the mass ratio of NiMoO_(4)/Co-B is 3:1)present greatly enhanced electrochemical characteristics compared with other components,and show superior specific capacity of 236.2 mA h g^(-1)at the current density of 0.5 A g^(-1),as well as remarked rate *** present work broadens the horizons of advanced electrode design with distinct heterogeneous interface in other energy storage and conversion field.

关键词： Crystalline-amorphous heterophase Mott-Schottky heterostructure Energy storage Nickel molybdate

来源：评论

学校读者我要写书评

暂无评论

Fabrication of graphene nanoplatelets reinforced Mg matrix composites via powder thixoforging

引用

Journal of Magnesium and Alloys 2022年第11期10卷 3113-3132页

作者： Pingbo Wang Jun Shen Tijun Chen Qinglin Li Xiao’an Yue Lingyun Wang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou730050China

A powder thixoforging route combined with slurry based mixing process was proposed to fabricate graphene nanoplatelets(GNPs) reinforced magnesium matrix composites(MgMCs). The originally spherical and ball-milled ZK60 powders were used as matrices, *** mixing of 0.05 wt.% GNPs with the spherical powder led to GNPs clusters and degraded the mechanical properties of the *** contrast, with the addition of an optimal content(0.1 wt.%) of GNPs, the composite fabricated from ball-milled powder achieved a joint enhancement in tensile yield strength(52%) and fracture toughness(19%), demonstrating a pronounced strengthening efficiency of 650% and a good balance between strength and toughness. The ball-milled powder endowed the composite with a homogenous distribution of GNPs and a denser microstructure with reduced Mg-Zn eutectics, and the thixoforging process offered a well-bonded Mg/GNP interface, making full use of the strengthening and toughening potential of GNPs. Theoretical predication based on a modified shear-lag model suggested that load transfer dominated the strengthening mechanisms. In-situ tensile tests verified that crack deflection, secondary cracks and GNPs bridging mainly accounted for the toughening mechanisms. A numerical model with consideration of GNPs orientations was also established to understand the toughening effect from GNPs bridging.

关键词： Graphene nanoplatelets(GNPS) Magnesium Powder thixoforging Strengthening Toughening

来源：评论

学校读者我要写书评

暂无评论

Formation Mechanism of Precursor Films at High Temperatures:A Review

引用

Chinese Journal of Mechanical Engineering 2022年第4期35卷 42-52页

作者： Qiaoli Lin Lu Liu Wenqi Zhu State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Lanzhou University of TechnologyLanzhou 730050China

The formation of a precursor flm(PF)is always coupled with better wettability;thus,clarifying the formation mechanism is required to optimize the interfacial ***,recent research focuses on inert wetting systems at room temperature,which cannot guide practical material processing at high *** this review,PF formation mechanisms at high temperatures were *** mechanisms are surface difusion,evaporation–condensation,subcutaneous infltration,and rapid absorption and flm *** experimental metal/metal systems,the most probable mechanism is subcutaneous infltration,related to the apparent contact angle,radius,and height of the gap between the substrate metal and the oxide *** rapid absorption and flm overfow mechanism usually occurs in metal/ceramic *** PF appearance for the adsorption mechanism must satisfy the paradox,that is,the relative inertial and high-afnity liquid/solid ***,another possible mechanism of PF appearance for the reactive wetting system at high temperatures was proposed,that is,the thin-surface transport *** PF formation is sensitive to external ***,it is necessary to develop thermodynamic and dynamic models for predicting and simulating PFs.

关键词： Wettability Wetting foot Halo Difusing band

来源：评论

学校读者我要写书评

暂无评论

Extraction and recycling technologies of cobalt from primary and secondary resources:A comprehensive review

引用

International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 628-649页

作者： Yukun Huang Pengxu Chen Xuanzhao Shu Biao Fu Weijun Peng Jiang Liu Yijun Cao Xiaofeng Zhu ZhongYuan Critical Metals Laboratory Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Cobalt has excellent electrochemical,magnetic,and heat *** a strategic resource,it has been applied in many hightech ***,the recent rapid growth of the battery industry has substantially depleted cobalt resources,leading to a crisis of cobalt resource *** paper examines cobalt ore reserves and distribution,and the recent development and consumption of cobalt resources are summarized as *** addition,the principles,advantages and disadvantages,and research status of various methods are discussed *** can be concluded that the use of diverse sources(Cu-Co ores,Ni-Co ores,zinc plant residues,and waste cobalt products)for cobalt production should be enhanced to meet developmental ***,in recovery technology,the pyro-hydrometallurgical process employs pyrometallurgy as the pretreatment to modify the phase structure of cobalt minerals,enhancing its recovery in the hydrometallurgical stage and facilitating high-purity cobalt ***,it represents a promising technology for future cobalt ***,based on the above conclusions,the prospects for cobalt are assessed regarding cobalt ore processing and sustainable cobalt recycling,for which further study should be conducted.

关键词： cobalt recovery copper-cobalt ore nickel-cobalt ore zinc plant residue waste cobalt products

来源：评论

学校读者我要写书评

暂无评论

Regulation of bimodal structure and mechanical properties of powder-thixoformed GO/ZK60 magnesium matrix composite through adjusting GO content

引用

Journal of Materials Science & Technology 2023年第31期162卷 74-89页

作者： Lingyun Wang Tijun Chen State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Although remarkable strength enhancements can be achieved in graphene oxide(GO)/graphene nanoplatelets(GNPs)reinforced Mg matrix composites by using the available techniques,their ductility is always quite poor due to the difficultly avoided strength-ductility *** conquer this dilemma,GO/ZK60 composites with bimodal-grain structure were fabricated using powder thixoforming in this *** results indicate that the grain size and volume fraction of coarse grains(CGs)first decrease as the GO content increases to 0.2 wt.%and then increase again as the content increases to 0.3 wt.%,while the grain size in the fine grains(FGs)almost does not ***,the strength of the composites is improved with increasing GO content and reaches the peak values at the content of 0.2 wt.%.The composite with 0.1 wt.%GO content exhibits significantly increased tensile yield strength up to 177±2 MPa while maintaining a high elongation of 23.1%±2.5%,being equivalent to that of the ZK60 matrix *** increased FGs volume fraction,together with the promoted dislocation accumulation and storage via GO and grain refinement of large-sized CGs lead to the improvement of strain hardening ability,thus rendering the composite an excellent ***,the deformation of the GO/ZK60 composites occurs progressively from the FGs to the CGs,which is opposite to the status of the milled ZK60 matrix *** view of the microstructure characteristics of the composites,a new complex calculation model was proposed and it could well predict the strength of the bimodal GO/ZK60 *** study provides a new insight into the microstructure design and fabrication technology of GO/GNPs reinforced metal-based composites with high strength and ductility.

关键词： Graphene oxide Bimodal structure Magnesium matrix composites Mechanical properties Powder thixoforming

来源：评论

学校读者我要写书评

暂无评论

Formation of intermetallic compounds during reaction between Ti and Al-Mg alloys with various Mg contents

引用

Journal of Materials Science & Technology 2023年第28期159卷 225-243页

作者： Min Gao Tijun Chen State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

The reactions between Ti and Al-Mg alloys were systematically investigated by heating the Ti/Al-Mg al-loy powder mixture compacts with Mg contents ranging from 5.09 to 40.36 wt.%at 660°*** element in the Al-Mg alloys contributed to the breakage of the oxide films on the surfaces of the Ti and Al-Mg alloy powders,thus,promoting the *** the samples with Mg contents varying from 5.09 wt.%to 25.93 wt.%,the first-formed intermetallic compound was Al_(18)Ti_(2)Mg_(3),and then Al_(3)Ti generated at the Al_(18)Ti_(2)Mg_(3)/Ti *** the Mg content in the Al-Mg melts decreased during the subsequent heat-ing process,the previously formed Al_(18)Ti_(2)Mg_(3)in the Ti/Al-5.09Mg sample transformed into Al_(3)Ti accom-panied by the reaction of Al with Ti to newly form Al_(3)Ti,generating a single Al_(3)Ti *** contrast,the new formation of Al_(3)Ti and its transformation to Al_(18)Ti_(2)Mg_(3)proceeded continuously in the Ti/Al-13.54Mg and Ti/Al-25.94Mg samples,resulting in a mixture of Al_(18)Ti_(2)Mg_(3)and a little Al_(3)Ti *** the Ti/Al-40.54Mg sample,Al_(3)Ti was the unique reaction product throughout the heating *** final Al_(3)Ti particles in the Ti/Al-5.09Mg sample were in a blocky shape,while they were in a plate-like form in the Ti/Al-40.54Mg sample,which was caused by the enhanced growth anisotropy due to the de-creased interfacial energy between Al_(3)Ti particles and Al-Mg melts with the increase of Mg content.A twin plane re-entrant mechanism was suggested for the growth of Al_(18)Ti_(2)Mg_(3)particles,weakening the anisotropic growth caused by the directional supply of Ti atoms,and contributing to the blocky mor-phology of Al_(18)Ti_(2)Mg_(3)*** addition,the volume difference between the formed Al_(18)Ti_(2)Mg_(3)and consumed Ti was greater than that between the Al_(3)Ti and Ti,and the Al_(18)Ti_(2)Mg_(3)has worse plasticity than the Al_(3)Ti,resulting in the Al_(18)Ti_(2)Mg_(3)reaction product fracturing more easily d

关键词： Mg content Intermetallic compound Phase transformation Morphology Twin

来源：评论

学校读者我要写书评

暂无评论

Argon-assisted electrical explosion of graphite powder in a constraint tube: Experimental and MD insights into the exfoliation mechanism

引用

Ceramics International 2025年第16期51卷 21689-21701页

作者： Zhu, Wenli Zhu, Liang Department of Civil and Environmental Engineering University of California Los Angeles United States School of Materials Science and Engineering State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China

We report a top-down electrical explosion approach in a constraint tube under an argon atmosphere for high-yield production of few-to multi-layer graphene. By coupling high-voltage discharges with inert gas support, this technique imparts intense shock loading that surmounts the interlayer van der Waals forces in graphite. Systematic experimental analyses (FE-SEM, TEM/HRTEM, AFM, Raman) confirm efficient exfoliation into largely few-layer graphene with minimal defects and residual graphite. To elucidate the atomistic mechanisms, large-scale molecular dynamics (MD) simulations replicate key stages of the process—annealing, shock-induced delamination, and cooling—revealing how shock loading and argon interactions drive interlayer expansion, bending, and partial delamination. Notably, argon significantly mitigates re-agglomeration during the cooling stage, preserving dispersed graphene flakes. This synergy between experiment and simulation establishes electrical explosion in an argon-rich environment as a scalable method potentially suitable for commercial graphene production. Moreover, it highlights the crucial role of controlled shock conditions and argon gas interactions in enabling robust, few-layer exfoliation, paving the way for further optimization and industrial implementation. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Research on Slurry Extrusion-based Additive Manufacturing Process for Bauxite Shell Mould 75

Research on Slurry Extrusion-based Additive Manufacturing Pr...

引用

75th World Foundry Congress, WFC 2024

作者： Liu, Hongjun Li, Yamin Su, Guoling Wang, Junhong Liu, Jiao State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology 287 Langongping Road Gansu Lanzhou730050 China

Directly fabricating casting shell mould through additive manufacturing technologies can simplify the process, shorten the manufacturing time, and enhance the rapid manufacturing and trial production capabilities of castings. A slurry extrusion-based additive manufacturing process for casting shell mould was proposed in this paper, which can fabricate green shell parts by extruding and stacking bauxite slurry. An additive manufacturing equipment with Delta mechanism was designed and manufactured, with a recommended extrusion speed of no more than 100 mm/s, a ratio of feeding speed to extrusion speed of 1.0, and a layer height of 80% of the nozzle diameter. By analyzing the rheological properties and extrusion formability of the slurry, it is recommended to use 42.5 vol.% bauxite and 51 vol.% silica sol in the slurry, with a yield stress range of 300-400 Pa for the best forming effect. When the infill pattern is the honeycomb pattern and the filling density is 80%, the bending strength, porosity, and shrinkage are 11.62 MPa, 41.6%, and 1.9%, respectively, and the thermal conductivity is also good. Finally, the feasibility of this additive manufacturing process was verified through the preparation of sample shell mould and their trial casting. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Bauxite deposits

来源：评论

学校读者我要写书评

暂无评论

Simulation of single bubble dynamic process in pool boiling process under microgravity based on phase field method

引用

Chinese Physics B 2023年第4期32卷 473-481页

作者：朱昶胜赵博睿雷瑶郭秀婷 College of Computer and Communication Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Gansu Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou 730050China

We use the phase field method to track the gas-liquid interface based on the gas-liquid two-phase flow in the pool boiling process,and study the bubble nucleation,growth,deformation,departure and other dynamic behaviors on the heating surface under *** simulating the correlation between liquid undercooling and bubble dynamics,we find that the bubble growth time increases with the increase of liquid undercooling,but the effect of liquid undercooling on bubble height is not ***,the gas-liquid-solid three-phase contact angle and the gravity level will also have an effect on the bubble growth time and bubble *** the increase of the contact angle,the bubble growth time and bubble height when the bubble departs also *** the effect of gravity level is on the contrary,the smaller the gravity level is,the larger the bubble height and bubble growth time when the bubble separates.

关键词： pool boiling single-bubble phase-field method low-gravity

来源：评论

学校读者我要写书评

暂无评论

Effects of Heat Treatment on the Thermal Properties of A356 Aluminum Alloys in Different Casting Processes 75

Effects of Heat Treatment on the Thermal Properties of A356 ...

引用

75th World Foundry Congress, WFC 2024

作者： Luo, Xiaomei Li, Yuan-Dong Liu, Wenjing Qiu, Jin Sun, Lu Zhou, Hongwei Bi, Guang-Li State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology Lanzhou730050 China Key Lab. of Non-ferrous Metal Alloys and Processing Ministry of Education Lanzhou University of Technology Lanzhou730050 China

The thermal diffusivity and specific heat capacity of continuous casting (SC) and high-pressure diecasting (HPDC) aluminum alloys before and after T4 and T6 heat treatments were measured at room temperature, and their thermal conductivity was calculated. The effects of heat treatments on the thermal properties of A356 alloys in different casting processes were investigated, and the mechanism of the effects was also discussed. Before heat treatment, the SC alloys had higher thermal conductivity than that of the HPDC alloys. Moreover, heat treatment after forming had a remarkable influence on the thermal properties of the SC and HPDC alloys. T4 treatment had positive effects on the thermal conductivity of the SC and HPDC A356 alloys, and the T6 heat-treatment SC and HPDC alloys had higher thermal conductivity than that of the T4 treatment alloys. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Continuous casting

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：