检索结果-内蒙古大学图书馆

Material removal mechanism of BaTiO3 and grinding force modeling based on scratching and grinding

ceramics International 2025年

作者： Li, Jinming Cui, Xiaoqi Sui, Tianyi Zhou, Jingguo Zhao, Pengcheng Lin, Bin Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin University Tianjin300072 China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin University Tianjin300072 China

Barium titanate (BaTiO3) is one of the most widely used electronic ceramic materials. Currently, there is little research on BaTiO3 in the manufacturing field, which limits the improvement of the performance of electronic devices. In this paper, combined with acoustic emission signals, a series of nano-scratch, micro-scratch and grinding experiments were conducted to study its material removal mechanism and machining characteristics at different scales. The results show that depth played a decisive role in scratch damage, and the increase in scratching speed can effectively inhibit the expansion of cracks. After grinding, the surface was mainly brittle removal, such as intergranular fracture, transgranular overall truncation, and transgranular powder fracture. The brittle removal surface contained local plastic flow. There were intragranular microcracks and intergranular defects on the grinding subsurface. At the same time, a theoretical model of grinding force was established, and the predicted values of the model were in good agreement with the experimental results. The influence of machining parameters on grinding force was also discussed. Small grinding depth, high rotation speed and low feed speed can reduce grinding force and improve surface quality. This study provides a theoretical basis and technical support for the realization of high-efficiency and low-damage grinding of BaTiO3. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Grinding (machining)

来源：评论

学校读者我要写书评

暂无评论

Hierarchically porous aluminum borate whisker-based ceramics via freeze-gel casting and in situ reaction

引用

Progress in Natural Science: Materials International 2025年第2期35卷 333-338页

作者： Xin, Jianqiang Liu, Xinger He, Chong Li, Wenbin Zhang, Yuheng Wu, Ze Guo, Anran Institute for Aero Engine Tsinghua University Beijing100084 China School of Materials Science and Engineering Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin300072 China Hubei Sanjiang Aerospace Jianghe Chemical Technology Co. Ltd Hubei 444299 China School of Textile Science and Engineering Wuhan Textile University Hubei Wuhan430200 China

Porous aluminum borate ceramics are ideal candidates for high-temperature thermal insulation applications. In this work, lightweight, high strength and thermal insulating aluminum borate whisker-based porous ceramics with hierarchical pore structure were fabricated by the combination of freeze-gel casting and in situ reaction. The effects of B/Al ratio on the morphology of aluminum borate whiskers and the addition amount of agar on the pore structure and properties of aluminum borate whisker-based porous ceramics were investigated. The aluminum borate whisker-based porous ceramics exhibited a typical hierarchical pore structure, including macro pores formed by the growth of ice crystal in the freeze casting process and micro pores in pore walls formed by the overlapped aluminum borate whiskers generated from the in situ reaction of B4C and Al2O3. Results shows when the B/Al molar ratio was 6:9 and the addition amount of agar was 0.4 g, the resultant aluminum borate whisker-based porous ceramics shows a low density (0.20 g/cm3), high porosity (93.5 %), high compressive strength (4.09 MPa) and low thermal conductivity (0.072 W/(m·K)), which can be regarded as a promising high temperature thermal insulation structural material. © 2024 Chinese Materials Research Society

关键词： Structural ceramics

来源：评论

学校读者我要写书评

暂无评论

Highly stabilized and selective ammonia electro-oxidation over CuNi metallic glass nanoarray

引用

Carbon Energy 2025年第2期7卷 131-143页

作者： Yunrui Tian Rui Chen Xiaoqing Liu Zixian Mao Haotian Tan De'an Yang Feng Hou Xiaoguang Liu Lichang Yin Xiao Yan Ji Liang Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and Engineering Tianjin UniversityTianjinChina Shenzhen Institute of Information Technology ShenzhenGuangdongChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyangLiaoningChina

Electrochemical nitrogen looping represents a promising carbon-free and sustainable solution for the energy transition,in which electrochemical ammonia oxidation stays at the central ***,the various nitrogen-containing intermediates tend to poison and corrode the electrocatalysts,even the state-of-the-art noble-metal ones,which is worsened at a high applied ***,we present an ultrarapid laser quenching strategy for constructing a corrosion-resistant and nanostructured CuNi alloy metallic glass *** this material,single-atom Cu species are firmly bonded with the surrounding Ni atoms,endowing exceptional resistance against ammonia corrosion relative of conventional CuNi ***,a record-high durability for over 300 h is *** quenching also allows a much higher Cu content than typical single-atom alloys,simultaneously yielding a high rate and selectivity for ammonia oxidation reaction(AOR).Consequently,an outstanding ammonia conversion rate of up to 95%is achieved with 91.8%selectivity toward nitrite after 8 *** simulations reveal that the structural amorphization of CuNi alloy could effectively modify the electronic configuration and reaction pathway,generating stable singleatom Cu active sites with low kinetic barriers for *** ultrarapid laser quenching strategy thus provides a new avenue for constructing metallic glasses with well-defined nanostructures,presenting feasible opportunities for performance enhancement for AOR and other electrocatalytic processes.

关键词： ammonia oxidation reaction CuNi laser quenching metallic glasses

来源：评论

学校读者我要写书评

暂无评论

Materials and devices for high‐density,high‐throughput micro‐electrocorticography arrays

引用

Fundamental Research 2025年第1期5卷 17-28页

作者： Yang Xie Yanxiu Peng Jinhong Guo Muyang Liu Bozhen Zhang Lan Yin He Ding Xing Sheng Department of Electronic Engineering Beijing National Research Center for Information Science and TechnologyInstitute for Precision MedicineLaboratory of Flexible Electronics TechnologyIDG/McGovern Institute for Brain ResearchTsinghua UniversityBeijing 100084China Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering The Key Laboratory of Advanced Materials of Ministry of EducationState Key Laboratory of New Ceramics and Fine ProcessingLaboratory of Flexible Electronics TechnologyTsinghua UniversityBeijing 100084China

The pursuit of precisely recording and localizing neural activities in brain cortical regions drives the development of advanced electrocorticography(ECoG)*** progress has led to the emergence of micro-ECoG(μECoG)devices with sub-millimeter *** review presents the current research status,development directions,potential innovations and applications of high-density,high-throughputμECoG ***,we summarize the challenges associated with accurately recording single or multiple neurons using existingμECoG devices,including passive multielectrode and active transistor ***,we focus on cutting-edge advancements in passiveμECoG devices by discussing the design principles and fabrication strategies to optimize three key parameters:impedance,mechanical flexibility,and ***,recent findings highlight the need for further research and development in active transistor arrays,including silicon,metal oxide,and solution-gated *** active transistor arrays have the potential to unlock the capabilities of high-density,high-throughputμECoG devices and overcome the limitations of passive multielectrode *** review explores the potential innovations and applications ofμECoG devices,showcasing their effectiveness for both brain science research and clinical applications.

关键词： Electrocorticography Micro-electrocorticography Flexible electronics Bioelectronics Neural electrode array

来源：评论

学校读者我要写书评

暂无评论

Composite dispersants for the preparation of monodisperse spherical alumina with uniform particle size

引用

ceramics International 2025年

作者： Ren, Junbo Huo, Mingda Liu, Pengbo Tan, Ying Li, Minghui Gao, Wei Sun, Xiaohong Guo, Ruisong Zhao, Xinqi School of Materials Science and Engineering State Key Laboratory of Precious Metal Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin300072 China CMP Advanced Materials Co. Ltd Tianjin300459 China

Spherical α-alumina powder has been widely used in advanced alumina ceramics manufacturing due to its excellent sphericity, uniform particle size distribution and good dispersion. However, the small size and fast growth rate of α-alumina precursor particles lead to strong agglomeration during grain growth, making it difficult to obtain uniformly dispersed α-alumina particles with good sphericity. In this study, polyethylene glycol 2000 (PEG2000) and poly (ammonium acrylate) (PAA-NH4) were used as composite dispersants to decrease agglomeration during the preparation of alumina precursors. When the contents of PEG2000 and PAA-NH4 were 0.5 g L−1 and 0.06 g L−1 (S4), respectively, uniformly dispersed alumina precursor particles with good sphericity and a particle size of about 506 nm were obtained, and the morphology remained stable after calcination. After molding and sintering the calcined powders, alumina ceramics with superior mechanical properties were produced. Compared to commercial α-alumina ceramics, flexural strength is increased by approximately 28.9 %, while fracture toughness is increased by approximately 29.2 %. This study offers a new foundation for the development of high-performance alumina powders and ceramics, supporting their engineering applications. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Calcination

来源：评论

学校读者我要写书评

暂无评论

Shear stress induced homogeneous shear band deformation during the electropulsing assisted asymmetric rolling of Mg[sbnd]1Gd alloy: Experiment and VPSC simulation

引用

Journal of Manufacturing Processes 2025年 146卷 65-78页

作者： Li, Xiaopei Huang, Xiaolong Lu, Liwei Xiao, Xiufeng Li, Xiaohui Deng, Biwei Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering College of Chemistry and Materials Science Fujian Normal University Fuzhou350007 China Yongjiang Laboratory Ningbo315210 China Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material Hunan University of Science and Technology Hunan Xiangtan411201 China School of Mechatronics Engineering and Automation Foshan University Foshan528000 China

Fabrication of Mg alloy thin sheet/strip is generally a tough job due to the basal texture induced severe plastic anisotropy and subsequent edge crack. In this study, Mg[sbnd]1Gd (G1) alloy thin strips were fabricated by electropulsing assisted asymmetric rolling (ASR), and conventional symmetric rolling (SR) for comparison. It has been found that edge crack of G1 alloy strip during ASR was substantially suppressed by the additional shear stress, which had close connections with the enhanced activities of prismatic slip system, twinning and the formation of densely and homogenously distributed shear bands, according to the results of electron back scatter diffraction (EBSD), finite element (FE) and visco-plastic self-consistent (VPSC) simulation. More importantly, compared with the SR sample, the ASR sample showed not only increased tensile strength (246 MPa) and elongation-to-failure (21.9 %) but also improved plastic anisotropy in terms of Lankford value (r-value). The enhanced mechanical properties of ASR sample were mainly resulted from its more significant grain refinement and texture randomization after recrystallization. © 2025 The Society of Manufacturing Engineers

关键词： Shear bands

来源：评论

学校读者我要写书评

暂无评论

Fabrication, dielectric, and microwave absorption properties of SiCnw by carbothermal reduction method based on vapor-solid growth mechanism

引用

ceramics International 2025年第14期51卷 19233-19247页

作者： Yin, Shuang Zhang, Yao Sun, Zuliang Sun, Chengyun Wan, Wei Min, Huihua Fang, Xia Ma, Haiqiang Xie, Xinchun Zuo, Ruzhong Center for Advanced Ceramics School of Materials Science and Engineering Anhui Polytechnic University Wuhu241000 China Anhui Polytechnic University Wuhu241000 China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol Fiber Materials Huaihua Key Laboratory for the Preparation of Ceramics Materials and Devices College of Chemistry and Materials Engineering Huaihua University Huaihua418000 China Electron Microscope Lab Nanjing Forestry University Nanjing210037 China

In this study, high-purity SiCnw with different compositions, structures, and morphologies were successfully synthesised through a carbothermal reduction method based on the vapor-solid growth mechanism. After sintering at 1200 °C for 1–3 h, the SiCnw exhibited a linear morphology with a core-shell structure composed of a crystalline 3C-SiC core and an amorphous SiO2 shell. After sintering at 1300 °C for 1–3 h, both linear and chain-beaded SiCnw with core-shell structure were synthesised. After sintering at 1400 °C for 1–3 h, more chain-beaded SiCnw with core-shell structure were obtained, but abundant cristobalite crystallised and precipitated from the amorphous SiO2 shell. Outstanding electromagnetic wave absorption properties were achieved owing to the multiple reflections of electromagnetic waves in the three-dimensional SiCnw network and SiC-SiO2 heterogeneous interface, conductance loss, and multiple polarisation losses, including interfacial polarisation losses at the SiC-SiO2 and SiCnw-SiCnw interfaces and dipole polarisation losses at the SiO2 shell, SiC-SiO2 and SiCnw-SiCnw interfaces, SiCnw surface, stacking faults, and twin crystals. The linear SiCnw synthesised at 1200 °C for 1 h showed RL = −20.38 dB (2.0 mm, 13.36 GHz) and EAB = 5.14 GHz. The mixture of linear and chain-beaded SiCnw synthesised at 1400 °C for 2 h had RL = −33.48 dB (2.5 mm, 8.42 GHz) and EAB = 2.32 GHz. These materials demonstrated broad application prospects in the radar stealth domain. This study indicates that the carbothermal reduction method is a feasible route for synthesising high-purity SiCnw using coconut shell activated carbon, silicon powders, and silicone oil as raw materials to achieve broadband absorption in the 2–18 GHz range. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sintering

来源：评论

学校读者我要写书评

暂无评论

Environment-friendly Ca^(2+)/Cr^(3+)co-doping LaAlO_(3) ceramics with excellent infrared radiation performance for energy-saving

引用

Journal of advanced ceramics 2025年第1期14卷 205-214页

作者： Xinglai Yuan Qinghu Wang Runke Wu Shaobai Sang Yibiao Xu Xiong Liang Liping Pan Bingbing Fan Yawei Li Rui Zhang Jiangtao Li Olena Volkova The State Key Laboratory of Refractories and Metallurgy Joint International Research Laboratory of Refractories and MetallurgyWuhan University of Science&TechnologyWuhan 430081China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Institute of Advanced Ceramics Henan Academy of SciencesZhengzhou 450046China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Institute of Iron and Steel Technology TU Bergakademie FreibergFreiberg 09599Germany

Ca^(2+)/Cr^(3+)co-doped LaAlO_(3) infrared(IR)ceramics have been proven to be potential energy-saving materials for high-temperature industries because of their high emissivity and high-temperature ***,Cr^(6+)formation commonly occurs in materials and poses environmental and health risks,such as Cr^(6+)dissolution in water and CrO_(3)(g)*** this study,we combined high emissivity with in situ detoxification by introducing residual Al_(2)O_(3) into Ca^(2+)/Cr^(3+)co-doped LaAlO_(3) *** with the undoped ceramics,the addition of 20 wt%residual Al_(2)O_(3) resulted in a 78.5%reduction to 18.44 mg/kg(lower than the EU standard of 20 mg/kg)in Cr^(6+)dissolution and a decrease in 77.8%CrO_(3)(g)*** significant detoxification effect can be attributed to the formation of CaAl_(12−x)Cr_(x)O_(19).Additionally,as the residual Al_(2)O_(3) content increased from 5 to 20 wt%,the ceramics maintained high emissivity,above 0.896 in the near-infrared band and 0.781 in the mid-infrared ***,the IR coating effectively increased the surface temperature(from 767.1 to 790.7℃/min)and the heat radiation of the heating source,increasing the heating rate from 31.7 to 34.6℃/min during water *** work offers a promising approach for designing environmentally friendly IR ceramics with excellent IR performance for energy-saving applications in the high-temperature industry.

关键词： infrared(IR)radiation energy-saving environmentally friendly Cr^(6+)suppression LaAlO_(3)

来源：评论

学校读者我要写书评

暂无评论

Constructing the multidirectional electrocatalytic restriction network for high-performance zinc-sulfur batteries

引用

Chemical Engineering Journal 2025年 514卷

作者： Zhao, Xinqi Li, Jun Wang, Song Sun, Xiaohong Huo, Mingda Zhao, Yingjie Liu, Hongyao Zheng, Chunming Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and Engineering Tianjin University Tianjin300072 China School of Chemical Engineering and Technology State Key Laboratory of Separation Membrane and Membrane Processes Tiangong University Tianjin300387 China

Aqueous zinc-sulfur (Zn-S) batteries with high theoretical energy density and safety are largely characterized as promise candidate for energy storage systems. However, challenges such as sluggish redox kinetics, low sulfur utilization, and unsatisfactory capacity of Zn-S batteries need to be addressed. Herein, we propose a multidirectional electrocatalytic restriction network, constructed from Sn nanoparticles grown in situ on carbonized bacterial cellulose and partially alloyed with Co (CBC@Sn-CoSn), to simultaneously tackle the aforementioned obstacles. Experimental results combined with theoretical calculations reveal that Sn nanoparticles provide an inhibitory effect on the disproportionation reaction and act as bifunctional electrocatalytic sites with CoSn to lower the activation energy barrier for sulfur-ZnS conversion. Moreover, the three-dimensional conductive catalytic network structure alleviates sulfur volume expansion, enhances charge transfer, and suppresses zinc dendrite growth. Notably, the uniquely designed cathode with CBC@Sn-CoSn delivers a high reversible capacity of 1332.7 mAh g−1 at 0.2 A g−1 and exhibits excellent cycling stability with a capacity decay of 0.095 % per cycle over 500 cycles at 3 A g−1. This work provides a viable solution for fabricating high-performance Zn-S batteries and enlightens the development of advanced energy storage devices. © 2025

关键词： Activation energy

来源：评论

学校读者我要写书评

暂无评论

Engineering design of feedstock powder and relevant thermal-mechanical performance of thermal/environmental barrier coatings

引用

Journal of advanced ceramics 2025年第2期14卷 37-56页

作者： Xinchang Feng Fangwei Guo Lirong Luo Yuzhang Wang Yun Long Xiaofeng Zhao Fei Pan Lei Guo Qingfeng Zeng Jing Feng Chunlei Wan Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering Shanghai 200030China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Nuclear Energy Technology Nuclear Power Institute of ChinaChengdu 610213China Innovative Sensor Technology IST AG Ebnat-Kappel 9642Switzerland School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianmushan Laboratory Hangzhou 311115China School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

The development of aeroengine with a high thrust-weight ratio poses great challenges for current top-coating thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) in service. Medium/high-entropy ceramics are highly promising candidate material for advanced TBCs/EBCs owing to their low thermal conductivity, high melting point, high-temperature stability, and calcium–magnesium–alumino–silicate (CMAS) resistance. Most feedstock powder used for medium/high-entropy TBCs/EBCs is prepared via traditional spray drying, which cannot fully exploit the advantages of multicomponent ceramics. The density, sphericity, inner structure, and flowability of feedstock powder affect their melting state during the thermal spraying process, which strongly affects the microstructure and properties of the deposited coatings. Therefore, the deposited coatings exhibit phase segregation, amorphous phases, and microstructure defects owing to unpredictable variations in feedstock powder with random morphologies and structures. Here, the structure and properties of feedstock powder prepared by state-of-the-art granulation technologies and their influences on the deposited coatings were systematically investigated, which can provide guidance for configuration optimization of feedstock powder and the manufacturing accuracy of the deposited coating. This review aims to bridge the gap between cutting-edge ceramics and advanced engineering technologies, thus providing concrete background knowledge and crucial guidelines for designing and developing TBCs/EBCs.

关键词： thermal/environmental barrier coatings(TBCs/EBCs) spraying ceramic powder multiscale structure control high-entropy ceramics thermal-mechanical performance

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：