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In-situ reconstructed Cu-In2O3 electron-rich interfaces facilitate high selective CO2-to-CO conversion at low potentials 认领 引用
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作者 Bin Yang Ouardia Akdim +6 位作者 Chengcheng Yuan Ruina Li Luo Yu Hermenegildo García Jiaguo Yu Graham J.Hutchings Panyong Kuang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第6期117-129,共13页
The electroreduction of CO2to CO is fundamentally hindered by sluggish COOH intermediate formation and the competing hydrogen evolution reaction.Herein,we show that this challenge can be addressed through the dynam... The electroreduction of CO2to CO is fundamentally hindered by sluggish COOH intermediate formation and the competing hydrogen evolution reaction.Herein,we show that this challenge can be addressed through the dynamic in-situ reconstruction of a CuO/In2O3precursor under electrochemical CO2reduction conditions.By employing in-situ electrochemical spectroscopy techniques in combination with theoretical calculations,we demonstrate that the presence of In2O3facilitates the complete reduction of CuO to metallic Cu.This in-situ reconstruction produces electron-rich Cu-In2O3interfaces,characterized by a reduced work function and an upshifted Cu 3d-band center,which promote CO2activation and the formation of COOH/CO intermediates.Those interfacial properties lead to a pronounced electronic coupling that endows the electrocatalyst with high CO2-to-CO selectivity at low potentials.Specifically,the optimised Cu/In2O3achieves CO Faradaic efficiency above 90%across−0.5 to−0.9 V vs.the reversible hydrogen electrode,reaching 97.6%at−0.6 V in a H-type cell,and sustains a high CO selectivity of 96.0%even at an ultralow potential of−0.2 V in a flow-cell configuration.These findings underscore the crucial role of electron-rich interfaces in directing CO2reduction with exceptional selectivity and activity toward CO formation. 展开更多
关键词 CO2reduction reaction In-situ reconstruction Cu/In2O3composite Electron-rich interface CO2-to-CO conversion
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On microstructure and room-/high-temperature properties of an Al2O3/Al-Cu-Mn composite 认领 引用
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作者 Jing-bin Liu Jing-yi Hu +3 位作者 Meng-yu Li Gui-liang Liu Tong Gao Xiang-fa Liu 《China Foundry》 SCIE EI CAS CSCD 2025年第4期471-479,共9页
An Al2O3/Al-Cu-Mn composite was fabricated using a combination of ball milling and liquid-solid reaction,with a nominal composition of Al-4Cu-0.5Mn-2.8γ-Al2O3.The composite contains reinforcement particle... An Al2O3/Al-Cu-Mn composite was fabricated using a combination of ball milling and liquid-solid reaction,with a nominal composition of Al-4Cu-0.5Mn-2.8γ-Al2O3.The composite contains reinforcement particles,including nano-sizedθ’and T(Al20Cu2Mn3)particles after T6 heat treatment,as well as in-situ synthesized nano-sizedγ-Al2O3particles.Tensile tests of the Al-4Cu-0.5Mn-2.8γ-Al2O3composite and the Al-4Cu-0.5Mn base alloy after T6 treatment were carried out at room temperature and elevated temperatures(200°C,300°C,and 400°C).Compared with the base alloy,the yield strength of the Al-4Cu-0.5Mn-2.8γ-Al2O3composite after T6 treatment increases significantly from 187 MPa to 263 MPa at room temperature.Simultaneously,at elevated temperatures,the yield strength is also enhanced,with a yield strength of 52 MPa at 400°C for this composite.The in-situ fabricatedγ-Al2O3particles,mainly distributed along the grain boundaries,are supposed to play the main strengthening role,especially at high temperatures.This work acts as a reference for designing composites for high-temperature applications. 展开更多
关键词 Al matrix composite mechanical strength microstructure Al2O3
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Introducing High-Volume-Fraction Ultrafine Grains to Obtain Superior Balance of Strength and Electrical Conductivity for Cu/Al2O3Composite 认领 引用
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作者 Zhang Jun Liu Xi +7 位作者 Li Yi Chang Guo Peng Haoran Zhang Shuang Huang Qi Zhao Xueni Li Liang Huo Wangtu 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第4期908-919,共12页
Compared with Cu/Al2O3composites,high-strength Cu/Al2O3composites usually exhibit obviously deteriorated electrical conductivity.A chemical and mechanical alloying-based strategy was adopted to fabricate u... Compared with Cu/Al2O3composites,high-strength Cu/Al2O3composites usually exhibit obviously deteriorated electrical conductivity.A chemical and mechanical alloying-based strategy was adopted to fabricate ultrafine composite powders with lowcontent reinforcement and constructed a combined structure of Cu ultrafine powders covered with in-situ Al2O3nanoparticles.After consolidation at a relatively lower sintering temperature of 550℃,high-volume-fraction ultrafine grains were introduced into the Cu/Al2O3composite,and many in-situ Al2O3nanoparticles with an average size of 11.7±7.5 nm were dispersed homogeneously in the Cu grain.Results show that the composite demonstrates an excellent balance of high tensile strength(654±1 MPa)and high electrical conductivity(84.5±0.1%IACS),which is ascribed to the synergistic strengthening effect of ultrafine grains,dislocations,and in-situ Al2O3nanoparticles.This approach,which utilizes ultrafine composite powder with low-content reinforcement as a precursor and employs low-temperature and high-pressure sintering subsequently,may hold promising potential for large-scale industrial production of high-performance oxide dispersion strengthened alloys. 展开更多
关键词 Cu/Al2O3composite ultrafine grain in-situ Al2O3nanoparticle strengthening mechanism electrical conductivity
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Morphology and Frictional Characteristics Under Electrical Currents of Al_2O_3/Cu Composites Prepared by Internal Oxidation 认领 引用 被引量：10
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作者 刘瑞华 宋克兴 +3 位作者 贾淑果 徐晓峰 郜建新 国秀花 《Chinese Journal of Aeronautics》 SCIE EI CAS 2008年第3期281-288,共8页
Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and coppe... Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and copper against brass are investigated and compared. The changes in morphology of the sliding surface and subsurface are examined with scanning electron microscope （SEM） and energy dispersive X-ray spectrum （EDS）. The results show that the wear resistance of the Al2O3/Cu composites is superior to that of copper under the same conditions, Under a given electrical current, the wear rate of Al2O3/Cu composites decreases as the Al2O3-content increases, However, the wear rates of the Al2O3/Cu composites and copper increase as the sliding speed and pressure increase under dry sliding condition. The main wear mechanisms for Al2O3/Cu composites are of abrasion and adhesion; for copper, it is adhesion, although wear by oxidation and electrical erosion can also be observed as the speed and pressure rise. 展开更多
关键词 Al2O3/Cu composite internal oxidation friction and wear surface morphology current carder
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High Temperature Deformation of Al_2O_3/Cu Composites 认领 引用 被引量：3
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作者 Jianjun WU. Yun ZHANG, Yanfei JIANG and Meiyun XUE Department of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China Tingquan LEI School of Materials Science and Engineering, Harbin Institute of Technology, Uarbin 15000 《Journal of Materials Science & Technology》 SCIE EI CAS 2001年第3期325-328,共4页
This work concerns with the high temperature deformation of internally oxidized Al2O3/Cu composites. The investigation revealed that dispersive alumina can obstruct dislocation sliding and define the subgrain size the... This work concerns with the high temperature deformation of internally oxidized Al2O3/Cu composites. The investigation revealed that dispersive alumina can obstruct dislocation sliding and define the subgrain size thereby improve significantly the strength of the materials at high temperature. The sliding of dislocations is a main deformation mechanism in the given temperature range. The sliding of grain boundary and diffusive creep play important roles at high temperature and low strain rate. The dispersoids can raise the recrystallization temperature to higher than 1223 K. Dynamic recovery is a main softening way under the experimental conditions. Higher deformation rate and lower deformation temperature imply a higher flow stress. 展开更多
关键词 High Temperature Deformation of Al2O3/Cu Composites Cu Al
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石墨烯对光固化Al2O3陶瓷力学性能的影响 认领 引用
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作者 刘耀 余庆轩 +3 位作者 王中原 文蓉江 李澜波 占丽娜 《热加工工艺》 CAS 北大核心 2026年第13期75-82,共8页
针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含... 针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含量的石墨烯,制备高固相、低粘度的光固化浆料。通过傅里叶红外光谱、旋转流变仪、沉降试验及Beer-Lambert模型分析,优化了浆料配方与光固化工艺参数。结果表明:当KH560含量为2.5wt%、石墨烯含量为0.01wt%时,浆料粘度最低、沉降分层最少;在曝光时间4 s条件下,添加0.01wt%石墨烯的浆料透射深度为382μm,临界曝光能量为44.3 m J/cm2。经1750℃烧结后,陶瓷零件致密度达99.7%,弯曲强度为27.61 MPa,维氏硬度为13.45GPa。石墨烯通过位阻效应及裂纹偏转机制有效促进了烧结致密化并改善了力学性能。本研究为光固化增材制造高致密、高性能氧化铝陶瓷提供了试验依据。 展开更多
关键词 石墨烯 光固化 Al2O3陶瓷 浆料 流变性能
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釉中SiO2和Al2O3含量对青花瓷“晕散”的影响研究 认领 引用
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作者 李小龙 胡其国 +2 位作者 赵田贵 董伟霞 包启富 《中国陶瓷》 CAS CSCD 北大核心 2026年第7期79-88,共10页
青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光... 青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光谱(FTIR)、电子探针(EPMA)、光学显微镜(OM)等设备分析青花瓷釉中SiO2和Al2O3含量对青花装饰晕散距离、微观结构、釉层网络结构以及釉中Co2+浓度的影响,结合理论计算阐明了青花瓷“晕散”与釉料黏度之间的关系。实验结果表明,随着釉中SiO2和Al2O3含量的增加,釉层网络结构中Si—O—Si键数量增多并且增强,釉层黏度增大;黏流活化能拟合结果表明,黏流活化能增大,原子间作用力越强,Co2+在釉中扩散越困难,青花瓷线条的“晕散”距离从250μm减小到10μm。本研究有助于从物理化学角度理解青花“晕散”机制,为青花装饰工艺的优化提供科学依据。 展开更多
关键词 青花瓷 SiO2 Al 2O3 晕散 黏流活化能
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The Effect of Oxide Particle Addition on the High Temperature Properties and Ablation Resistance of Quartz/Ceramicizable Phenolic Resin Composite Materials 认领 引用
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作者 ZHOU Rui DING Jie +3 位作者 WU Tengfei LU Xiaodie CHEN Jingyu LI Zhiqiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期820-827,共8页
In order to investigate the effects of oxide particles on the high-temperature resistance and ablation performance of ceramicizable phenolic resin composites,three types of quartz fiber-reinforced ceramicizable phenol... In order to investigate the effects of oxide particles on the high-temperature resistance and ablation performance of ceramicizable phenolic resin composites,three types of quartz fiber-reinforced ceramicizable phenolic resin composites were prepared using MgO particles or Al2O3 particles as the second-phase oxides and ZrB2 particles as the high-temperature ceramic filler,through a mold pressing process.The enhancement effects and mechanisms of the added second-phase oxides on the high-temperature resistance and ablation performance of the composites were discussed and analyzed through high-temperature testing,phase characterization,oxyacetylene testing,and microstructure characterization.The results show that ZrB2 particles oxidize to form ZrO2 and B2O3 in an oxygen-rich high-temperature environment.The added second-phase oxide particles can react with B2O3 to form corresponding borates,thereby strengthening the matrix.After treatment at 800℃,the flexural strength of the ZrB2-MgO quartz fiber-reinforced phenolic resin composite(QFPR/ZM)increased by 55.3%compared to the ZrB2 quartz fiber-reinforced phenolic resin composite(QFPR/Z).The oxyacetylene ablation performance of the composites with added oxide particles was significantly influenced by the generated borates.Mg3B2O6 has a higher high-temperature viscosity than Al18B4O33 at high temperatures,resulting in a lower linear ablation rate for QFPR/ZM compared to the ZrB2-Al2O3 quartz fiber-reinforced phenolic resin composite(QFPR/ZA). 展开更多
关键词 MgO Al2O3 phenolic resin ceramicizable composite mechanical properties
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Influence of lanthanum on enhancement of mechanical and electrical properties of Cu-Al_2O_3 composites 认领 引用 被引量：14
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作者 Yifan Zhang Zhen Ji +3 位作者 Chengchang Jia Guimin Liu Farong Wan Qian Zhan 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第5期534-540,共7页
Two kinds of Cu-Al_2O_3 composites(with and without La) were prepared via mechanical alloying-spark plasma sintering(MA-SPS) method. Microstructure, mechanical properties and electrical resistivity were investigated s... Two kinds of Cu-Al_2O_3 composites(with and without La) were prepared via mechanical alloying-spark plasma sintering(MA-SPS) method. Microstructure, mechanical properties and electrical resistivity were investigated systematically using metallography, scanning electron microscopy, transmission electron microscopy, mechanical and electrical properties testing. The results indicate that an appropriate amount of La can homogenize the distribution of Al_2O_3. As such, yield strength, ultimate tensile strength and elongation of Cu-Al_2O_3-La are greatly increased. Some semi-coherent interface between Cu and Al_2O_3 is found, which means a low interface energy. The grain shape of Cu changes to irregular band with the addition of La. This change results in a density decrease of grain boundary and reduces electrical resistance. Lanthanum may exist in the form of La_2O_3. 展开更多
关键词 Cu-Al2O3 composite Lanthanum Mechanical alloying Spark plasma sintering Electrical resistivity Rare earths
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Influence of particulate morphology on microstructure and tribological properties of cold sprayed A380/Al2O3 composite coatings 认领 引用 被引量：9
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作者 Xiang Qiu Naeem ul Haq Tariq +5 位作者 Lu Qi Jun-Rong Tang Xin-Yu Cui Hao Du Ji-Qiang Wang Tian-Ying Xiong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第9期9-18,共10页
In this study,three kinds of A380/Al2O3 composite coatings were prepared by cold spray(CS)using spherical,irregular and spherical+irregular shaped Al2O3 particulates separately mixed in the original A380 alloy powders... In this study,three kinds of A380/Al2O3 composite coatings were prepared by cold spray(CS)using spherical,irregular and spherical+irregular shaped Al2O3 particulates separately mixed in the original A380 alloy powders.The influence of Al2O3 particulates’morphology on the microstructural characteristics(i.e.retention of Al2O3 content in coatings,coating/matrix interfacial bonding,pore size distribution and morphology etc.)and wear performance of the coatings was investigated by scanning electron microscopy(SEM),X-ray computed tomography(XCT)and 3-D optical profilometry.Results indicated that the spherical Al2O3 showsobvious tamping effect during deposition process.As a result,the interfaceshowedawavy shape while the matrix and particulates were mechanical interlocked with much improved adhesion.In addition,the porosity of the coating was minimized and the pores exhibited curved spherical structure with reduced dimensions.The irregular Al2O3 particles predominantly displayed the embedding effect together with fragmentation of Al2O3 particulates.Consequently,poor coating/matrix interfacial bonding,high porosity and the formation of angular-shaped pores were resulted in the coating.Dry sliding wear tests results revealed that the wear resistance of the coating is directly related with the retained content of Al2O3 in the coating.The coating containing irregular Al2O3 particulates displayed superior wear performance with its wear rate one seventh of that of the pure A380 alloy coating.The coating containing both kinds of Al2O3 particulates showed mixed characteristics of above two kinds of Al2O3 composite coatings. 展开更多
关键词 Cold spray Al2O3 particulates X-ray computed tomography Wear test
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Fabrication of an in-situ nanoAl_2O_3/Cu composite with high strength and high electric conductivity 认领 引用 被引量：7
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作者 SHENYutian ZHUJing +2 位作者 XUYanji WANGBaoheng LITongze 《Rare Metals》 SCIE EI CAS 2005年第1期46-54,共9页
A heat-resistant dispersion-strengthening nano-Al_2O_3/Cu composite with highstrength and high electric conductivity was fabricated in a multiplex medium. The internaloxidation product, microstructures and properties ... A heat-resistant dispersion-strengthening nano-Al_2O_3/Cu composite with highstrength and high electric conductivity was fabricated in a multiplex medium. The internaloxidation product, microstructures and properties of the composite, and the process flow weresystematically studied. It is confirmed that this new technique simplifies the process and improvesthe properties of the composite. X-ray analysis indicates that the alumina particles formed duringinternal oxidation consist of a large mount of gamma-Al_2O_3 and a certain amount of theta-Al_2O_3and alpha-Al_2O_3. TEM observation shows that the obtained gamma-Al_2O_3 nano-particles areuniformly distributed in the copper grains; their mean size and space between particles are 7 runand 30 nm, respectively. The main properties of the composite with 50 percent cold deformation areas follows: the electric conductivity is 51 MS/m (87 percent IACS), sigma_b = 628 MPa, and thehardness is HRB86. After annealing at 1273 K, all or most of the above properties remain, and themicrostructures are still dependent on elongated fiber-form grains. 展开更多
关键词 Al_2O_3/Cu composite internal oxidation dispersion strengthening microstructure property
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(B4C+Al2O3)/Al中子吸收材料的稳定化工艺 认领 引用
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作者 石宝铭 昝宇宁 +2 位作者 王全兆 肖伯律 马宗义 《科技导报》 CAS CSCD 北大核心 2026年第2期98-107,共10页
(B4C+Al2O3)/Al复合材料作为乏燃料干式贮存系统中的关键中子吸收材料,其在高温下长期服役的可靠性直接关系到核废料安全管理的有效性。该结构功能一体化材料在高温下存在非晶Al2O3(am-Al2O3)向γ-Al2O3相... (B4C+Al2O3)/Al复合材料作为乏燃料干式贮存系统中的关键中子吸收材料,其在高温下长期服役的可靠性直接关系到核废料安全管理的有效性。该结构功能一体化材料在高温下存在非晶Al2O3(am-Al2O3)向γ-Al2O3相变的风险,可能导致力学性能降低,但目前对其组织演化规律及性能稳定性的认识仍不足。为此,对(B4C+Al2O3)/Al复合材料进行了400℃/100 h和550℃/8 h 2种稳定化工艺处理,并通过400℃下最长4000 h的退火实验验证其长期稳定性。结果表明,经稳定化处理后,复合材料在室温及350℃下的抗拉强度分别保持在220.0和100.0 MPa以上,满足工程应用需求。微观组织分析表明,am-Al2O3部分转化为γ-Al2O3,但材料在退火过程中组织与性能均趋于稳定。2种工艺均能有效提升材料的热稳定性,为(B4C+Al2O3)/Al复合材料制备的乏燃料干式贮存容器实现长期安全服役提供了材料学依据。 展开更多
关键词 中子吸收材料 (B4C+Al2O3)/Al复合材料 稳定化工艺 力学性能 微观组织
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Al-Si/Al_2O_3 in situ composite prepared by displacement reaction of CuO/Al system 认领 引用 被引量：3
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作者 Zhang Jing Yu Huashun +1 位作者 Chen Hongmei Min Guanghui 《China Foundry》 SCIE CAS 2010年第1期19-23,共5页
Al2O3 particle-reinforced ZL109 composite was prepared by in situ reaction between CuO and Al2O3 . The microstructure was observed by means of OM, SEM and TEM. The Al2O3 particles in sub-micron sizes distribute unifor... Al2O3 particle-reinforced ZL109 composite was prepared by in situ reaction between CuO and Al2O3 . The microstructure was observed by means of OM, SEM and TEM. The Al2O3 particles in sub-micron sizes distribute uniformly in the matrix, and the Cu displaced from the in situ reaction forms net-like alloy phases with other alloy elements. The hardness and the tensile strength of the composites at room temperature have a slight increase as compared to that of the matrix. However, the tensile strength at 350℃ has reached 90.23 MPa, or 16.92 MPa higher than that of the matrix. The mechanism of the reaction in the CuO/AI system was studied by using of differential scanning calorimetry（DSC） and thermodynamic calculation. The reaction between CuO and Al involves two steps. First, CuO reacts with Al to form Cu20 and Al2O3 at the melting temperature of the matrix alloy, and second, Cu20 reacts with Al to form Cu and Al2O3 at a higher temperature. At ZL109 casting temperature of 750- 780 ℃, the second step can also take place because of the effect of exothermic reaction of the first step. 展开更多
关键词 aluminium matrix composites in situ reaction Al2O3 particles ZL109 CuO
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Effect of CuO particle size on synthesis temperature and microstructure of Al_2O3p-Al composites from Al-CuO system 认领 引用 被引量：2
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作者 赵鸽 史志铭 +1 位作者 塔娜 张瑞英 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第12期3901-3906,共6页
Al2O3p-Al composites were synthesized using an in-situ reaction in the 80%Al-20%CuO （mass fraction） system. The effects of the CuO particle size on the synthesis temperature and microstructure of the composites were... Al2O3p-Al composites were synthesized using an in-situ reaction in the 80%Al-20%CuO （mass fraction） system. The effects of the CuO particle size on the synthesis temperature and microstructure of the composites were investigated by various methods. The results indicate that the CuO particle size has a significant effect on the temperature at which the complete reaction in the Al-CuO system occurs：the temperature is 200 ℃ lower in the Al-CuO system containing CuO particles with sizes less than 6μm than that containing CuO particles with sizes less than 100μm. The interfacial bonding between Al2O3 particles and Al is not complete when the temperature is below a critical value. The morphology of the Al2O3 particles varies from ribbon-like shape to near spherical shape when the temperature is above a critical value. These two critical temperatures are affected by the particle size of CuO, and the critical temperature of the sample containing CuO particles with sizes less than 6μm is 100 ℃ lower than that of the sample containing CuO particles with sizes less than 100μm. 展开更多
关键词 CuO particle size synthesis temperature Al2O3p-Al composite
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Al23/Al2O3 Joint Brazed with Al2O3-particulate-contained Composite Ag-Cu-Ti Filler Material 认领 引用 被引量：2
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作者 Jianguo YANG Hongyuan FANG Xin WAN 《Journal of Materials Science & Technology》 SCIE EI CAS 2005年第5期782-784,共3页
Microstructure and interracial reactions of Al2O3 joints brazed with Al2O3-particulate-contained composite Ag-Cu-Ti filler material were researched by scanning electron microscopy(SEM),electron probe microscopy analys... Microstructure and interracial reactions of Al2O3 joints brazed with Al2O3-particulate-contained composite Ag-Cu-Ti filler material were researched by scanning electron microscopy(SEM),electron probe microscopy analysis(EPMA),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).The interracial reaction layer thickness of joints brazed with conventional active filler metal and active composite filler materials with different volume fraction of Al2O3 particulate was also studied.The experimental results indicated although there were Al2O3 particulates added into active filler metals,the time dependence of interracial layer growth of joints brazed with active composite filler material is t^1/2 as described by Fickian law as the joints brazed with conventional active filler metal. 展开更多
关键词 Composite filler materials Braze Interface Al2O3
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退火对原子层沉积W/Al2O3纳米薄膜形貌与电学性能的影响 认领 引用
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作者 高管哗 王国政 +1 位作者 蒋恩桐 王天昊 《物理化学进展》 2026年第2期110-121,共12页
在氮气气氛下对原子层沉积法制备的W/Al2O3薄膜进行了退火处理,利用高阻测试仪、扫描电子显微镜及能量色散X射线谱对薄膜进行表征,研究了退火对薄膜电学性能及形貌的影响。结果表明,在1 h退火时间下,400℃~600℃退火不仅使薄膜方块电阻... 在氮气气氛下对原子层沉积法制备的W/Al2O3薄膜进行了退火处理,利用高阻测试仪、扫描电子显微镜及能量色散X射线谱对薄膜进行表征,研究了退火对薄膜电学性能及形貌的影响。结果表明,在1 h退火时间下,400℃~600℃退火不仅使薄膜方块电阻数值明显降低,而且随退火温度升高呈持续下降趋势,当退火温度上升至700℃~800℃时,方块电阻偏离下降趋势,出现了明显上升趋势;当退火时间延长至2 h时,薄膜在400℃~500℃条件下仍保持下降趋势,但在600℃条件下方块电阻出现明显跃升。SEM与EDS结果表明,电学异常与薄膜表面连续性下降密切相关。 展开更多
关键词 原子层沉积 W/Al2O3纳米薄膜 退火 方块电阻 表面形貌
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Effect of La_2O_3 on electrical friction and wear properties of Cu-graphite composites 认领 引用 被引量：6
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作者 莫飞 凤仪 +4 位作者 陈阳明 王雨晴 钱刚 豆亚坤 张学斌 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第3期327-333,共7页
Sliding friction and wear experiments using Cu-La2O3-graphite composites against Cu-5 wt.%Ag alloy ring were conducted at a constant sliding speed of 10 m/s, a current density of 10 A/cm2 and a load of 2.5 N/cm2. Thes... Sliding friction and wear experiments using Cu-La2O3-graphite composites against Cu-5 wt.%Ag alloy ring were conducted at a constant sliding speed of 10 m/s, a current density of 10 A/cm2 and a load of 2.5 N/cm2. These composites with different La2O3 and graphite contents were fabricated by hot-pressing. Physical and mechanical properties of the composites were examined. Morphologies of the worn surface of composites were observed using optical microscopy. X-ray photoelectron spectroscopy spectra were used to study compositions of the lubricating film. The results showed that with the increasing addition of La2O3, hardness, flexural strength and electrical resistivity increased, but the relative density dropped. The friction coefficient increased with the increasing addition of La2O3. Composite containing 3 vol.% of La2O3 and 37 vol.% of graphite showed the best wear resistance. The main wear mechanisms of composites were abrasive wear, oxidative wear and adhesive wear. 展开更多
关键词 Cu-La2O3-graphite composites electrical contacts contact voltage drop friction wear rare earths
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Microstructure and Mechanical Properties of Submicron-grained NiAl-Al2O3Composite Prepared by Pulse Current Auxiliary Sintering 认领 引用 被引量：1
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作者 XU Guihua LU Zhen +1 位作者 ZHANG Kaifeng HUANG Zhequn 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第4期715-720,共6页
Dense and submicron-grained NiAl-Al2O3 composite was fabricated by pulse current auxiliary sintering(PCAS).Its microstructure was analyzed by XRD,SEM and TEM,and its mechanical behavior was evaluated through compressi... Dense and submicron-grained NiAl-Al2O3 composite was fabricated by pulse current auxiliary sintering(PCAS).Its microstructure was analyzed by XRD,SEM and TEM,and its mechanical behavior was evaluated through compression test and fracture toughness test.The average grain sizes of NiAl and Al2O3 are about 200 nm and 100 nm respectively.The Al2O3 particles dispersed in NiAl matrix,forming intergranular structure and intragranular structure.During sintering,Al2O3 particles were remarkably spherized due to the unique sintering mechanism of PCAS,which is beneficial to the improvement of toughness.The NiAl-Al2O3 composite exhibits high compressive yield strength,whether at room temperature or elevated temperature.Its room-temperature(23℃)and elevated-temperature(1200℃)compressive yield strength are up to 2050 MPa and 140 MPa,respectively.Meanwhile,its fracture toughness is significantly enhanced,which is up to 8.2 MPa?m1/2.It is suggested that the main strengthening-toughening mechanisms are grain refinement strengthening and Al2O3 dispersion strengthening.The fracture of larger NiAl grain is the transgranular cleavage and this is induced by crack tip deflection and grain boundary weakening which are caused by intergranular and intragranular Al2O3 particles,respectively. 展开更多
关键词 NiAl Al2O3 composite pulse current auxiliary sintering microstructure mechanical behavior
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Model of critical strain for dynamic recrystallization in 10%TiC/Cu-Al_2O_3 composite 认领 引用 被引量：5
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作者 杨志强 刘勇 +1 位作者 田保红 张毅 《Journal of Central South University》 SCIE EI CAS 2014年第11期4059-4065,共7页
Using the Gleeble-1500 D simulator, the hot deformation behavior and dynamic recrystallization critical conditions of the 10%Ti C/Cu-Al2O3(volume fraction) composite were investigated by compression tests at the tempe... Using the Gleeble-1500 D simulator, the hot deformation behavior and dynamic recrystallization critical conditions of the 10%Ti C/Cu-Al2O3(volume fraction) composite were investigated by compression tests at the temperatures from 450 °C to 850 °C with the strain rates from 0.001 s-1 to 1 s-1. The results show that the softening mechanism of the dynamic recrystallization is a feature of high-temperature flow true stress-strain curves of the composite, and the peak stress increases with the decreasing deformation temperature or the increasing strain rate. The thermal deformation activation energy was calculated as 170.732 k J/mol and the constitutive equation was established. The inflection point in the lnθ-ε curve appears and the minimum value of-(lnθ)/ε-ε curve is presented when the critical state is attained for this composite. The critical strain increases with the increasing strain rate or the decreasing deformation temperature. There is linear relationship between critical strain and peak strain, i.e., εc=0.572εp. The predicting model of critical strain is described by the function of εc=1.062×10-2Z0.0826. 展开更多
关键词 10%Ti C/Cu-Al2O3 composite hot deformation constitutive equation dynamic recrystallization critical condition
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Influence of current density on nano-Al_2O_3/Ni+Co bionic gradient composite coatings by electrodeposition 认领 引用 被引量：1
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作者 Yan Liu Luquan Ren +1 位作者 Sirong Yu Zhuwu Han 《Journal of University of Science and Technology Beijing》 2008年第5期633-637,共5页
Metal and nano-ceramic nanocomposite coatings were prepared on the gray cast iron surface by the electrodeposition method. The Ni-Co was used as the metal matrix,and nano-Al2O3 was chosen as the second-phase particula... Metal and nano-ceramic nanocomposite coatings were prepared on the gray cast iron surface by the electrodeposition method. The Ni-Co was used as the metal matrix,and nano-Al2O3 was chosen as the second-phase particulates. To avoid poor inter-face bonding and stress distribution,the gradient structure of biology materials was found as the model and therefore the gradient composite coating was prepared. The morphology of the composite coatings was flatter and the microstructure was denser than that of pure Ni-Co coatings. The composite coatings were prepared by different current densities,and the 2-D and 3-D morphologies of the surface coatings were observed. The result indicated that the 2-D structure became rougher and the 3-D surface density of apices became less when the current density was increased. The content of nanoparticulates reached a maximum value at the current density of 40mA·cm^-2,at the same time the properties including microhardness and wear-resistance were analyzed. The microhardness reached a maximum value and the wear volume was also less at the current density of 40mA·cm^-2. The reason was that nano-Al2O3 particles caused dispersive strengthening and grain refining. 展开更多
关键词 electrodeposition composite coating current density nano-Al2O3 microstructure mechanical properties
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