期刊文献+
共找到370篇文章
< 1 2 19 >
每页显示 20 50 100
New Hybrid Copper Composite Materials Based on Carbon Nanostructures 被引量:7
1
作者 Tatyana S. Koltsova Larisa I. Nasibulina +4 位作者 Ilya V. Anoshkin Vasily V. Mishin Esko I. Kauppinen Oleg V.Tolochko Albert G. Nasibulin 《材料科学与工程(中英文B版)》 2012年第4期240-246,共7页
关键词 铜复合材料 碳纳米结构 石墨复合材料 化学气相沉积技术 混合 颗粒表面 温度范围 力学性能
下载PDF
Template synthesis of copper azide primary explosive through Cu2O@HKUST-1 core-shell composite prepared by “bottle around ship” method 被引量:1
2
作者 Xu-wen Liu Yan Hu +4 位作者 Jia-heng Hu Jia-xin Su Cai-min Yang Ying-hua Ye Rui-qi Shen 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第7期99-111,共13页
Copper azide(CA), as a primary explosive with high energy density, has not been practically used so far because of its high electrostatic sensitivity. The Cu2O@HKUST-1 core-shell structure hybrid material was synthesi... Copper azide(CA), as a primary explosive with high energy density, has not been practically used so far because of its high electrostatic sensitivity. The Cu2O@HKUST-1 core-shell structure hybrid material was synthesized by the “bottle around ship” methodology in this research by regulating the dissolution rate of Cu2O and the generation rate of metal-organic framework(MOF) materials. Cu2O@HKUST-1 was carbonized to form a Cu O@porous carbon(CuO@PC) composite material. CuO@PC was synthesized into a copper azide(CA) @PC composite energetic material through a gas-solid phase in-situ azidation reaction.CA is encapsulated in PC framework, which acts as a nanoscale Faraday cage, and its excellent electrical conductivity prevents electrostatic charges from accumulating on the energetic material’s surface. The CA@PC composite energetic material has a CA content of 89.6%, and its electrostatic safety is nearly 30times that of pure CA(1.47 mJ compared to 0.05 mJ). CA@PC delivers an outstanding balance of safety and energy density compared to similar materials. 展开更多
关键词 composite energetic materials copper azide CARBONIZATION Template method Core-shell composite Electrostatic safety
下载PDF
Tungsten combustion in impact initiated W-Al composite based on W(Al) super-saturated solid solution 被引量:1
3
作者 Kong-xun Zhao Xiao-hong Zhang +5 位作者 Xiao-ran Gu Yu Tang Shun Li Yi-cong Ye Li'an Zhu Shu-xin Bai 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第7期112-120,共9页
Element W can effectively improve the density of energetic structural materials. However, W is an inert element and does not combust in air. To change the reaction characteristics of W, 60 at.% Al was introduced into ... Element W can effectively improve the density of energetic structural materials. However, W is an inert element and does not combust in air. To change the reaction characteristics of W, 60 at.% Al was introduced into W through mechanical alloying. XRD analysis shows that after 50 h of ball milling, the diffraction peak of Al completely disappears and W(Al60) super-saturated solid solution powder is obtained. Further observation by HAADF and HRTEM reveals that the W(Al60) super-saturated solid solution powder is a mixture of solid solution and amorphous phase. Based on the good thermal stability of W(Al60) alloy powder below 1000℃, W(Al60)-Al composite was synthesized by hot pressing process.Impact initiation experiments suggest that the W(Al60)-Al composite has excellent reaction characteristics, and multiple types of tungsten oxides are detected in the reaction products, showing that the modified W is combustible in air. Due to the combustion of tungsten, the energy release rate of the W(Al60)-Al composite at speed of 1362 m/s reaches 2.71 kJ/g. 展开更多
关键词 tungsten combustion Reactive materials Super-saturated solid solution Shock-induced reactions WeAl composite
下载PDF
Fabrication and thermal conductivity of copper matrix composites reinforced by tungsten-coated carbon nanotubes 被引量:6
4
作者 Jun-hui Nie Cheng-chang Jia +3 位作者 XianJia Yi Li Ya-feng Zhang Xue-bing Liang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第5期446-452,共7页
Carbon nanotubes (CNTs) were coated by tungsten using metal organic chemical vapor deposition. Magnetic stirring was employed to disperse the W-coated CNTs (W-CNTs) in a Cu matrix, and then, the mixed powders were... Carbon nanotubes (CNTs) were coated by tungsten using metal organic chemical vapor deposition. Magnetic stirring was employed to disperse the W-coated CNTs (W-CNTs) in a Cu matrix, and then, the mixed powders were consolidated by spark plasma sintering. The W-CNTs obtained a uniform dispersion within the Cu matrix when the W-CNT content was less than 5.0vo1%, but high content of W-CNTs (10vol%) resulted in the presence of clusters. The W-CNT/Cu composites containing low content of W-CNTs (〈5.0vol%) exhibited a higher thermal conductivity than the sintered pure Cu, while the CNT/Cu composites exhibited no increase in thermal conductivity after the incorporation of uncoated CNTs. The W-CNT content was found to play a crucial role in determining the thermal conductivity of the W-CNT/Cu composites. The thermal conductivity of the W-CNT/Cu composites increased first and then decreased with the W-CNT content increasing. When the W-CNT content was 2.5vo1%, the W-CNT/Cu composite obtained the maximum value of thermal conductivity. The thermal resistance of the (W-CNT)-Cu interface was predicted in terms of Maxwell-Gamett effective medium approximation, and its calculated value was about 3.0× 10-9 m2.K.W-l. 展开更多
关键词 metallic matrix composites (MMCs) carbon nanotubes tungsten copper spark plasma sintering thermal conductivity
下载PDF
Tungsten nanoparticle-strengthened copper composite prepared by a sol–gel method and in-situ reaction 被引量:2
5
作者 Tian-xing Lu Cun-guang Chen +2 位作者 Zhi-meng Guo Pei Li Ming-xing Guo 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第11期1477-1483,共7页
Tungsten nanoparticle-strengthened Cu composites were prepared from nanopowder synthesized by a sol–gel method and in-situ hydrogen reduction.The tungsten particles in the Cu matrix were well-dispersed with an averag... Tungsten nanoparticle-strengthened Cu composites were prepared from nanopowder synthesized by a sol–gel method and in-situ hydrogen reduction.The tungsten particles in the Cu matrix were well-dispersed with an average size of approximately 100–200 nm.The addition of nanosized W particles remarkably improves the mechanical properties,while the electrical conductivity did not substantially decrease.The Cu–W composite with 6 wt%W has the most comprehensive properties with an ultimate strength of 310 MPa,yield strength of 238 MPa,hardness of HV 108 and electrical conductivity of 90%IACS.The enhanced mechanical property and only a small loss of electrical conductivity demonstrate the potential of this new strategy to prepare W nanoparticle-strengthened Cu composites. 展开更多
关键词 copper composites second phase strengthening tungsten sol–gel method
下载PDF
Synergistic regulation of current-carrying wear performance of resin matrix carbon brush composites with tungsten copper composite powder 被引量:1
6
作者 TU Chuan-jun GONG Pei +4 位作者 REN Gai-mei CHEN Gang CHEN Jian HONG Li-rui LIU Ping 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第10期2973-2987,共15页
Resin matrix carbon brush composites(RMCBCs)are critical materials for high-powered electric tools.However,effectively improving their wear resistance and heat dissipation remains a challenge.RMCBCs prepared with flak... Resin matrix carbon brush composites(RMCBCs)are critical materials for high-powered electric tools.However,effectively improving their wear resistance and heat dissipation remains a challenge.RMCBCs prepared with flake graphite powders that were evenly loaded with tungsten copper composite powder(RMCBCs-W@Cu)exhibited a low wear rate of 1.63 mm^(3)/h,exhibiting 48.6%reduction in the wear rate relative to RCMBCs without additives(RMCBCs-0).In addition,RMCBCs-W@Cu achieved a low friction coefficient of 0.243 and low electric spark grade.These findings indicate that tungsten copper composite powders provide particle reinforcement and generate a gradation effect for the epoxy resin(i.e.,connecting phase)in RMCBCs,which weakens the wear of RMCBCs caused by fatigue under a cyclic current-carrying wear. 展开更多
关键词 resin matrix carbon brush composite tungsten copper composite powder current-carrying wear particle reinforcement
下载PDF
Electrochemical behavior of different shelled microcapsule composite copper coatings 被引量:1
7
作者 Xiu-qing Xu Yan-hong Guo Wei-ping Li Li-qun Zhu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第3期377-384,共8页
Copper/liquid microcapsule composite coatings with polyvinyl alcohol (PVA), gelatin or methyl cellulose (MC) as shell materials were prepared by electrodeposition. The influence of shell materials on the corrosion... Copper/liquid microcapsule composite coatings with polyvinyl alcohol (PVA), gelatin or methyl cellulose (MC) as shell materials were prepared by electrodeposition. The influence of shell materials on the corrosion resistance of the composite coatings in 0.1 M H2SO4 was investigated by means of electrochemical techniques, scanning electron microscopy (SEM), and energy dispersion spectrometry (EDS). The results show that the participation of microcapsules can enhance the corrosion resistance of the composite coatings compared with the traditional copper layer. Based on the analysis of electrochemical test results, the release ways of microcapsules were deduced. Gelatin and MC as the shell materials of microcapsules are easy to release quickly in the composite coating. On the contrary, the releasing speed of PVA microcapsules is relatively slow due to their characteristics. 展开更多
关键词 composite coatings shell materials copper MICROCAPSULES electrochemical properties corrosion resistance ELECTRODEPOSITION
下载PDF
Interfacial microstructure and properties of diamond/Cu-xCr composites for electronic packaging applications 被引量:12
8
作者 ZHANG Ximin GUO Hong YIN Fazhang FAN Yeming ZHANG Yongzhong 《Rare Metals》 SCIE EI CAS CSCD 2011年第1期94-98,共5页
Diamond/Cu-xCr composites were fabricated by pressure infiltration process.The thermal conductivities of diamond/Cu-xCr(x = 0.1,0.5,0.8) composites were above 650 W/mK,higher than that of diamond/Cu composites.The t... Diamond/Cu-xCr composites were fabricated by pressure infiltration process.The thermal conductivities of diamond/Cu-xCr(x = 0.1,0.5,0.8) composites were above 650 W/mK,higher than that of diamond/Cu composites.The tensile strengths ranged from 186 to 225 MPa,and the bonding strengths ranged from 400 to 525 MPa.Influences of Cr element on the thermo-physical properties and interface structures were analyzed.The intermediate layer was confirmed as Cr3C2 and the amount of Cr3C2 increased with the increase of Cr concentration in Cu-xCr alloys.When the Cr concentration was up to 0.5 wt.%,the content of the Cr3C2 layer was constant.As the thickness of the Cr3C2 layer became larger,the composites showed a lower thermal conductivity but higher mechanical properties.The coefficients of thermal expansion(CTE) of diamond/Cu-xCr(x = 0.1,0.5,0.8) composites were in good agreement with the predictions of the Kerner' model. 展开更多
关键词 composite materials copper interfaces bonding electronic packaging INFILTRATION
下载PDF
Microstructure and properties of ultrafine WC-10Co composites with chemically doped VC 被引量:6
9
作者 PANG Cholsong LUO Ji GUO Zhimeng 《Rare Metals》 SCIE EI CAS CSCD 2011年第2期183-188,共6页
Vanadium carbide is the most effective grain growth inhibitor for ultrafine WC-Co composites due to its high solubility and mobility in the cobalt phase at relatively low temperatures; however, there are still some de... Vanadium carbide is the most effective grain growth inhibitor for ultrafine WC-Co composites due to its high solubility and mobility in the cobalt phase at relatively low temperatures; however, there are still some debates over the best way to introduce it into the WC-Co formula- tion. In this paper, the differences between admixed and chemically doped grain growth inhibitors on the microstructural development and properties of an ultrafine WC-IOCo composite are discussed. The densification rate of chemically doped samples is slower in the early stage of sintering and the WC grain sizes of the sintered alloys are finer than those of admixed samples, leading to the increase of hardness and transverse rupture strength of the sintered alloys. The effectiveness of the chemically doped inhibitor is attributed to the formation of vana- dium rich layers on the surfaces of tungsten carbide powders during reduction and carbonization, which alters the surface and interface energies of WC grains, impedes the contact with each other of WC grains and contributes to the resistance to W diffusion across the layer during sintering, resulting in the inhibition of nanosized particle coalescence. 展开更多
关键词 composite materials tungsten carbide COBALT grain growth doping DENSIFICATION mechanical properties
下载PDF
Microstructural characterization of Cu/Al composites and effect of cooling rate at the Cu/Al interfacial region 被引量:2
10
作者 Yan-qiu Han Li-hua Ben +1 位作者 Jin-jin Yao Chun-jing Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第1期94-101,共8页
Cu/Al composites are of vital importance in industrial applications because of their numerous advantages. The influence of bond-ing temperature and cooling rate on the microstructure and morphology of Cu/Al composites... Cu/Al composites are of vital importance in industrial applications because of their numerous advantages. The influence of bond-ing temperature and cooling rate on the microstructure and morphology of Cu/Al composites was investigated in this paper. The interfacial morphology and constituent phases at the Cu/Al interface were analyzed by optical microscopy and field-emission scanning electron mi-croscopy equipped with energy-dispersive X-ray spectroscopy. The results indicate that effective Cu-Al bonding requires a higher bonding temperature to facilitate interdiffusion between the two metals. The microstructural characteristics are associated with various bonding tem-peratures, which impact the driving force of interdiffusion. It is observed that cooling rate exerts a significant influence on the morphology and amount of the intermetallic compounds at the interfacial region. Meanwhile, microhardness measurements show that hardness varies with the bonding temperature and rate of cooling. 展开更多
关键词 composite materials copper aluminum temperature cooling rate INTERFACES diffusion bonding
下载PDF
Effects of graphite on the microstructure and properties of ultrafine WC-11Co composites by spark plasma sintering 被引量:1
11
作者 SUN Lan YANG Tian'en +1 位作者 JIA Chengchang XIONG Ji 《Rare Metals》 SCIE EI CAS CSCD 2011年第1期63-67,共5页
Ultrafine WC-11Co hard metals added with different proportions of graphite were prepared by spark plasma sintering at 40 MPa/1200°C for 5 min,and the influence of graphite as free carbon on the microstructure and... Ultrafine WC-11Co hard metals added with different proportions of graphite were prepared by spark plasma sintering at 40 MPa/1200°C for 5 min,and the influence of graphite as free carbon on the microstructure and mechanical properties were investigated.The XRD analysis showed that decarbonization could be prevented by adding graphite.Compact hard metals composed of finer and more homogeneous WC grains with little flaws can be achieved after 0 wt.% to 1.5 wt.% graphite was added.The hardness and fracture toughness increase initially with increasing graphite content,and with over 1.5 wt.% they descend due to coarse grains and more defects.Therefore,1.5 wt.% graphite is the optimal addition content in view of the hardness and transverse rupture toughness.Furthermore,the coercive force decreases while the saturated magnetic intensity increases with the increase of graphite content. 展开更多
关键词 composite materials tungsten carbide COBALT GRAPHITE spark plasma sintering microstructure mechanical properties
下载PDF
Lead isotopic composition and lead source of the Tongchanghe basalt-type native copper-chalcocite deposit in Ninglang , western Yunnan , China 被引量:6
12
作者 张乾 朱笑青 张正伟 《Chinese Journal Of Geochemistry》 EI CAS 2006年第2期112-121,共10页
The Tongchanghe native copper-chalcocite deposit at Ninglang occurs in low-Ti basalts of western Yunnan, and the mode of fault-filling & metasomatism metallogenesis indicates that this deposit is of late-stage hyd... The Tongchanghe native copper-chalcocite deposit at Ninglang occurs in low-Ti basalts of western Yunnan, and the mode of fault-filling & metasomatism metallogenesis indicates that this deposit is of late-stage hydrothermal origin. This makes it more complicated to define the source of ore-forming materials. This paper introduces the Pb isotope data of Himalayan alkali-rich porphyries, regional Early-Middle Proterozoic metamorphic rock basement and various types of rocks of the mining district in western Yunnan with an attempt to constrain the origin of the Tongchanghe native copper-chalcocite deposit at Ninglang. The results showed that the ores are relatively homogeneous in Pb isotopic composition, implying a simple ore-forming material source. The three sets of Pb isotopic ratios in the Himalayan alkali-rich porphyries are all higher than those of the ores; the regional basement metamorphic rocks show a wide range of variations in Pb isotopic ratio, quite different from the isotopic composition of ore lead; the Pb isotopic composition of the Triassic sedimentary rocks and mudstone and siltstone interbeds in the Late Permian Heinishao Formation (corresponding to the forth cycle of basaltic eruption) in the mining district has the characteristics of radiogenic lead and is significantly different from the isotopic composition of ore lead; like the ores, the Emeishan basalts in the mining district and those regionally distributed possess the same Pb isotopic composition, showing a complete overlap with respect to their distribution range. From the above, the possibilities can be ruled out that the ore-forming materials of the Tongchanghe deposit were derived from the basement, a variety of Himalayan magmatic activities, etc. It is thereby defined that the ore-forming materials were derived largely from the Emeishan basalts. From the data available it is deduced that the native cupper-chalcocite-type metallogenesis that occurred in the Emeishan basalt-distributed area has the same metal source as the Tongchanghe deposit. 展开更多
关键词 云南 同位素 玄武岩 辉铜矿 沉积物
下载PDF
增强体表面改性在高导热金属基复合材料中的应用 被引量:2
13
作者 蔡志勇 文璟 +1 位作者 王日初 彭超群 《有色金属科学与工程》 CAS 北大核心 2024年第2期237-255,共19页
随着电子技术的高速发展和电子器件的更新换代,电子封装材料的性能需求越来越高。金属基复合材料,尤其是铝基和铜基复合材料具有高导热、低膨胀、高稳定性等特点,是具有广阔应用前景的电子封装材料。然而,金刚石、石墨烯、硅等增强体与... 随着电子技术的高速发展和电子器件的更新换代,电子封装材料的性能需求越来越高。金属基复合材料,尤其是铝基和铜基复合材料具有高导热、低膨胀、高稳定性等特点,是具有广阔应用前景的电子封装材料。然而,金刚石、石墨烯、硅等增强体与基体的润湿性差,或者在高温下与基体发生有害的界面反应,限制了此类高导热金属基复合材料的开发和应用。本文简述了金属基复合材料的界面研究进展,结合影响金属基复合材料界面结合的因素,提出了几种改善界面结合的方法。增强体表面改性是改善金属基复合材料界面的重要途径之一,常用工艺有磁控溅射法、化学气相沉积法、溶胶凝胶法、化学镀法等;最后,对增强体表面改性在高热导金属基复合材料中的应用进行分析和展望。 展开更多
关键词 电子封装材料 金属基复合材料 铝基复合材料 铜基复合材料 增强体 界面反应 表面改性
下载PDF
钼的靶向吸附材料合成及其性能研究
14
作者 常华 宿延涛 +3 位作者 勾阳飞 王海珍 李默 杨吴馨晨 《湿法冶金》 CAS 北大核心 2024年第2期166-171,共6页
研究了采用真空灌注法将α-安息香肟(α-BO)固载在多孔甲基丙烯酸酯聚合物载体(PMMA-DVB)中制备钼的靶向吸附材料(α-BO/PMMA),通过红外光谱、元素分析、热重分析及光学显微镜等手段对其进行结构表征,并考察了酸种类、H^(+)浓度、接触... 研究了采用真空灌注法将α-安息香肟(α-BO)固载在多孔甲基丙烯酸酯聚合物载体(PMMA-DVB)中制备钼的靶向吸附材料(α-BO/PMMA),通过红外光谱、元素分析、热重分析及光学显微镜等手段对其进行结构表征,并考察了酸种类、H^(+)浓度、接触时间及吸附平衡时溶液中MoO_(2)^(2+)浓度对α-BO/PMMA吸附性能的影响。结果表明:α-BO/PMMA对钼的吸附受酸度影响较大,在0.1 mol/L的盐酸介质中吸附量最高,最大吸附量为29.8 mg/g,该材料可有效分离提取钼。 展开更多
关键词 吸附材料 α-安息香肟 多孔载体 分离 提取
下载PDF
铜复合金属材料抗菌特性试验研究
15
作者 于劲松 黄煦 +7 位作者 任方圆 仲歆怡 曹慧 袁敏 叶泰 吴秀秀 郝丽玲 徐斐 《工业微生物》 CAS 2024年第4期75-81,共7页
文章将大肠埃希氏菌作为试验菌种,采用平板计数法评价铜及铜复合金属材料的抗菌性能。试验中,将适宜稀释度的菌悬液分别滴加在空白样本(聚乙烯片)和实验样本(白铜片、磷铜片和铍青铜片)上接触培养一段时间,洗脱后将洗脱液涂布于平板上... 文章将大肠埃希氏菌作为试验菌种,采用平板计数法评价铜及铜复合金属材料的抗菌性能。试验中,将适宜稀释度的菌悬液分别滴加在空白样本(聚乙烯片)和实验样本(白铜片、磷铜片和铍青铜片)上接触培养一段时间,洗脱后将洗脱液涂布于平板上进行培养,并进行菌落计数,以研究铜合金材料的抗菌特性,探索铜合金抗菌材料在诸多领域的深入应用。结果表明,接触白铜、磷铜、铍青铜3种材料24 h,稀释10~5倍的菌液培养24 h后基本无菌落生长。试验结果显示,铜合金材料的平均抗菌率R≥99%,且材料中起主要抗菌作用的成分是铜。铜合金材料的抗菌率与纯铜材料的抗菌率相近,且结果均符合Ⅰ级抗细菌率标准,所以判断这三类铜合金材料均具有强抗菌效果。 展开更多
关键词 铜复合材料 抗菌性 大肠埃希氏菌
下载PDF
银铜侧向复合材料界面结合机理分析
16
作者 宁德魁 谢明 +3 位作者 陈永泰 段云昭 刘国化 马洪伟 《铜业工程》 CAS 2024年第2期61-65,共5页
本文采用“包覆锭坯+扩散烧结+冷轧复合”联合工艺制备了银铜侧向复合带材,利用金相显微镜(OM)、扫描电镜(SEM)和能谱仪(EDS)观察分析银铜复合界面结构和元素分布,并分析其银铜复合界面的结合机理。结果表明,银铜复合界面形成过程为:1)... 本文采用“包覆锭坯+扩散烧结+冷轧复合”联合工艺制备了银铜侧向复合带材,利用金相显微镜(OM)、扫描电镜(SEM)和能谱仪(EDS)观察分析银铜复合界面结构和元素分布,并分析其银铜复合界面的结合机理。结果表明,银铜复合界面形成过程为:1)银铜接触界面处凹凸不平的表面在轧制力的作用下相互咬合,形成机械结合界面;2)接触面在轧制力的作用下,银铜表面氧化膜破裂,新鲜表面质点间在轧制变形热的作用下产生原子结合;3)在扩散烧结过程中,银铜界面处的原子在高温作用下被激活,银铜原子相互扩散,在界面处发生银铜共晶反应形成液相金属层,随着烧结时间的延长,其共晶反应液相层厚度逐渐增加,随后冷凝结晶,使银铜实现侧向冶金结合。4)在后续中间退火过程中,共晶层与两侧的铜、银基体相互扩散,铜、银原子向更深的方向逐渐扩散,在靠近共晶层铜侧和银侧逐步形成固溶体层,使银与铜的结合强度进一步提高。银铜侧向复合界面结合机理包含机械咬合结合、接触共晶反应自钎焊结合和原子扩散结合3种,复合界面结合强度较好,剪切强度达220 MPa。 展开更多
关键词 包覆锭坯 银铜复合材料 界面结合机理 共晶接触反应钎焊 微观组织
下载PDF
真空蒸镀钨改性金刚石/铜硼复合材料导热性能
17
作者 吴成元 王熹 +5 位作者 周科朝 焦增凯 姚远卓 吴建杰 马莉 魏秋平 《中国有色金属学报》 EI CAS CSCD 北大核心 2024年第7期2293-2303,共11页
采用真空蒸镀法在平板金刚石衬底表面镀覆钨镀层,构建多层平板结构以研究热处理温度对金刚石表面钨界面层形貌结构、物相成分及其与金刚石基体间界面结合情况的影响,并为金刚石颗粒表面金属化改性提供实验指导。在此基础上,以相同真空... 采用真空蒸镀法在平板金刚石衬底表面镀覆钨镀层,构建多层平板结构以研究热处理温度对金刚石表面钨界面层形貌结构、物相成分及其与金刚石基体间界面结合情况的影响,并为金刚石颗粒表面金属化改性提供实验指导。在此基础上,以相同真空蒸镀和热处理工艺制备的钨改性金刚石颗粒作为增强体,以铜硼合金作为基体,采用气体压力浸渗法制备相应的金刚石/铜硼复合材料,探究金刚石颗粒的热处理温度对复合材料导热性能的影响。结果表明:随着热处理温度的升高,复合材料热导率呈现先上升后下降的趋势,当热处理温度为1000℃时,复合材料界面结合明显改善,同时金刚石表面钨镀层依旧连续完整,此时,复合材料的热导率最高可达629 W/(m∙K)。 展开更多
关键词 真空蒸镀 界面改性 钨镀层 热导率 金刚石/铜基复合材料
下载PDF
冰球和钨珠非正冲击下T800-CFRP层合板损伤特性的研究
18
作者 尚晓壮 刘瑶璐 +3 位作者 冯晓伟 胡宁 谭晓军 胡艳辉 《振动与冲击》 EI CSCD 北大核心 2024年第11期135-147,共13页
通过试验和仿真相结合的方法研究了T800碳纤维增强复合材料(CFRP)层合板在冰球和钨珠非正冲击作用下的损伤特性。首先开展了冰球和钨珠在给定工况下高速撞击T800-CFRP层合板试验,以此对仿真模型的有效性进行验证;然后讨论了T800-CFRP层... 通过试验和仿真相结合的方法研究了T800碳纤维增强复合材料(CFRP)层合板在冰球和钨珠非正冲击作用下的损伤特性。首先开展了冰球和钨珠在给定工况下高速撞击T800-CFRP层合板试验,以此对仿真模型的有效性进行验证;然后讨论了T800-CFRP层合板在两种冲击体以不同冲击能量与冲击角度作用下的损伤特性及其差异性。研究表明:钨珠在冲击能量较低时就能对层合板造成穿孔损伤,但随着冲击能量增大层合板的损伤程度呈下降趋势;冰球对层合板造成损伤的冲击能量阈值与钨珠的相比要高很多,且随着冲击能量的增加损伤程度明显加剧;钨珠在冲击角度为45°和60°时造成的损伤与正冲击的情况相比要更加严重,而冲击角度为30°时造成的损伤却小于正冲击的情况;冰球冲击时,层合板的损伤程度随冲击角度的增加而减小。该研究有助于深化对T800-CFRP层合板在冲击载荷作用下的损伤与破坏行为的认识,具有重要的科学意义和工程应用价值。 展开更多
关键词 T800碳纤维增强复合材料 冰球 钨珠 非正冲击 损伤特性
下载PDF
CuO/Bi_(2)MoO_(6)复合材料在可见光下协同过一硫酸盐降解AO7
19
作者 蔡承润 赵丹 +2 位作者 董延茂 孙艺源 毛宗卿 《环境化学》 CAS CSCD 北大核心 2024年第3期806-815,共10页
本文采用水热法和浸渍煅烧法成功合成CuO/Bi_(2)MoO_(6)异质结,并建立了CuO/Bi_(2)MoO_(6)复合材料在可见光下活化过一硫酸盐降解AO7的协同催化体系.采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和紫外可见漫反射光... 本文采用水热法和浸渍煅烧法成功合成CuO/Bi_(2)MoO_(6)异质结,并建立了CuO/Bi_(2)MoO_(6)复合材料在可见光下活化过一硫酸盐降解AO7的协同催化体系.采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和紫外可见漫反射光谱(UV-vis)对复合材料的晶相结构、元素组成、形貌结构和吸收波长进行了表征,并探讨了在不同条件下的对AO7的去除性能.结果表明,CuO的引入增强了Bi_(2)MoO_(6)的光催化性能,同时增强了对PMS的活化.当AO7的浓度为0.1 mmol·L^(-1),催化剂为0.25 g·L^(-1),PMS为1 mmol·L^(-1)条件下,AO7的降解率可以在30 min内达到99%以上.提出了AO7一种可能存在的降解机理,并通过自由基消除实验进行了验证.复合材料在5次降解循环后仍能保持活化性能,具有较高的稳定性. 展开更多
关键词 钼酸铋 氧化铜 复合材料 光催化 过一硫酸盐
下载PDF
CuS/ZnS纳米复合材料的制备及其作为润滑油添加剂的摩擦学行为研究
20
作者 王兰美 钱建华 +1 位作者 张丹 李君华 《化学研究与应用》 CAS 北大核心 2024年第11期2536-2542,共7页
采用水热法制备了CuS/ZnS纳米复合材料,利用XRD、SEM等仪器对其结构进行了表征。结果表明:所制备的CuS/ZnS纳米复合材料呈微球结构,具有较细的颗粒尺寸和良好的分散性。采用四球摩擦试验机考察了所制样品作为添加剂在基础油中的摩擦性能... 采用水热法制备了CuS/ZnS纳米复合材料,利用XRD、SEM等仪器对其结构进行了表征。结果表明:所制备的CuS/ZnS纳米复合材料呈微球结构,具有较细的颗粒尺寸和良好的分散性。采用四球摩擦试验机考察了所制样品作为添加剂在基础油中的摩擦性能,利用SEM和光学显微镜观察了摩擦钢球表面磨痕形貌和磨斑直径大小,同时使用EDS对钢球表面典型元素进行测试,分析纳米材料对基础油摩擦学性能的影响机理。结果表明,加人CuS/ZnS的混合润滑油比基础油的摩擦系数和磨斑大小分别降低了30%和22%,表现出良好的减摩抗磨性能。EDS的结果表明,所制备的纳米复合材料在钢球表面形成了一层润滑膜,减少了摩擦副之间的直接接触。 展开更多
关键词 硫化铜 硫化锌 复合材料 润滑油添加剂 摩擦学性能
下载PDF
上一页 1 2 19 下一页 到第
使用帮助 返回顶部