共查询到20条相似文献,搜索用时 31 毫秒
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当前我国电缆工业“废杂铜的直接再生制杆”和“以铝节铜”已成为关注的“热点”。整个行业铜线的质量在下降,致使线缆产品的合格率大幅下降。铜包铝线和铜包钢线的用量正在逐步攀升,但“以铝节铜”的产品方向和在技术经济上的可行性在某些领域供、需双方还未取得共识和可行的结论。文章就废杂铜直接再生制杆、以铝节铜的现状、问题和建议进行论述,以期这两大热点向良性循环的方向发展。 相似文献
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详细介绍铜铝铜连接管的工艺实施过程,并通过微观扫描及水压、抗拉强度等宏观试验,验证该方法的可行性。 相似文献
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本文根据GB/T 3048.4-2007规定的试验方法,对大截面铝导体电缆进行导体直流电阻测试。建立测量模型,分析大截面铝导体直流电阻测量不确定度的主要来源,对其测量不确定度进行了评定,并对影响分量进行分析。对电缆其他测试项目的不确定度评定具有一定的参考价值。 相似文献
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铜铝复合母线槽的技术经济分析 总被引:1,自引:0,他引:1
介绍了铜铝复合母线槽的组成结构,对配电干线采用纯铜质母线槽、铜铝复合母线槽及采用铜电缆进行了技术经济分析,结果表明:同等条件下,采用铜铝复合母线槽可以节约投资40%以上. 相似文献
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据有关媒体报导,投资银行摩根大通最近表示,考虑到全球需求增长和库存持续紧张两个因素,该行已上调了2006年和2007年商品价格预估值。此外,还上调了欧洲三大金属生产商的股价目标。 相似文献
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眭敏 《制冷与空调(北京)》2010,10(3):44-46
空调换热器制冷铜管在安装数月后出现开裂泄漏制冷剂现象。对开裂的管材进行化学成分、力学性能、断口及金相检验分析。结果表明,Al-Cu渗蚀导致铜管底壁变薄,装配、运转应力导致开裂。追踪生产过程,发现火焰自动钎焊工艺中存在的Al-Cu渗蚀现象为铜管底壁变薄主要原因,据此提出相应的有效解决方案。 相似文献
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Huang Chongqi 《中国工程科学》2008,10(3):2-11
The copper consumption by the Chinese Cable Industry amounted to 3.54 million tons in 2006, taking over 70% of the total copper consumption in China in that year. At present, making copper rod directly from recovered scrap copper and saving copper with aluminium have become topics of general interests in the Chinese Cable Industry. The quality of the copper conductors in the Industry is declining, resulting in sharp decrease in the rate of qualified wire and cable products. More and more copper wires are drawn from the rods made directly from scrap copper. The manufacturers know well some of the wires or rods are unqualified products though, they continue to use or produce products not complying with standards in order to make profits. Now the consumption of copper-clad-aluminum and copper-clad-steel is growing gradually. In 2006, the consumption of copper-clad-aluminum in China amounted to ca. 50 000 tons. But in some applications, neither the common understanding between buyer and supplier nor the results of feasibility study are achieved in the product orientation and technical/economic feasibility in terms of saving copper with aluminium. This paper presents the status-quo, problems arisen and suggestions in terms of making copper rod directly from recovered scrap copper and saving copper with aluminium, in a view to promote these two topics of general interests to go toward a virtuous circle. 相似文献
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基于“低碳生活”方式的绿色设计新理念 总被引:7,自引:6,他引:1
通过分析“低碳”生活方式给人们生产生活带来的变化,阐述绿色设计的转变。从“回收”到“再生”到“减量”,“低碳”的理念促使人们从源头处改变粗放的生产方式和过度消费的生活习惯,代之以适度消费并转向更为精良的产品和倡导人性化的非物质设计理念。提出传统生活方式中的能量互构、循环开放以及现代设计中用情感延长物品生命周期等设计意识,可以赋予绿色设计与时俱进的新理念。 相似文献
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J. Freudenberger W. Grünberger E. Botcharova A. Gaganov L. Schultz 《Advanced Engineering Materials》2002,4(9):677-681
There is a need for high‐strength and highly‐conducting materials for applications such as pulsed high magnetic field coils. Two different approaches were studied in order to strengthen copper‐based conductor materials. On the one hand, microcomposite Cu‐Ag alloys yield high strength as a consequence of their nanoscale microstructure and, on the other hand, a Cu‐based macrocomposite can be strengthened by the use of a steel jacket. In both cases the increase of strength coincides with a decrease of conductivity. Thus, the ideal material balances between these two competing properties. 相似文献
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漫谈铝箔的包装市场及其发展趋势 总被引:6,自引:0,他引:6
铝箔是一种用金属铝直接压延成的薄片,铝箔用途十分广泛。近些年,铝箔包装市场发展快速,前景十分广阔,无论是消费量还是产品档次都有很大的发展空间。根据铝箔材料的性能特点和主要性能指标,论述了铝箔材料在复合软包装中的应用,介绍了铝塑复合材料包装应用广泛发展快速,研究了铝箔材料部分典型的包装市场,同时指出了铝箔包装发展潜力巨大前景可期。 相似文献
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报道了光度法联合测定铝镍钴永磁合金中镍、铝、铜的分析方法.试样用硝酸(1+1)溶解,高氯酸冒烟处理,用丁二酮肟光度法测定镍,铬天青S光度法测定铝,双环已酮草酰二腙光度法测定铜。方法操作简单、快速、准确. 相似文献
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随着特高压输电技术在我国的大力发展,铝合金导体材料作为特高压输电线路的主要组成部分,受到业内的广泛关注.本文采用电导率测试、硬度测试、金相显微镜和扫描电镜观察等手段,研究添加不同含量稀土Y对铸态Al-Zr耐热铝导体材料的影响.研究结果表明:Y元素和Fe、Si等杂质元素形成金属间化合物,可净化基体,改变杂质相的形态和分布,使其粒子化、球化和细化.Y元素在枝晶网络和晶界分布,从而细化晶粒和枝晶组织,但添加量达到0.5%时晶粒细化不均匀.当Y含量为0.2%时,电导率达到60%IACS;当Y含量为0.3%时,硬度达到最高值20.9HBS,且电导率并无明显下降.加入0.3%Y可使耐热铝导体材料获得较好的综合性能. 相似文献
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目的探索铝材短流程制备工艺,制备出高性能铝合金材料。方法采用连续流变挤压成形技术制备Al-Ti-B晶粒细化剂与Al-Sc-Zr耐热铝合金导线;利用提出的连续流变挤压与累积连续挤压法,制备超细晶金属材料。结果采用连续流变挤压成形技术制备Al-Ti-B晶粒细化剂,其细化效果优于国外同类产品,且制备流程短、成本低;制备出的高性能的Al-Sc-Zr耐热铝合金导线,其抗拉强度、伸长率和导电率分别达到223 MPa、7.1%和60.5%IACS,并且可在230℃的温度下长期运行,相比于日本耐热铝合金导线,其抗拉强度、伸长率与导电率分别提高了39.4%,255%,0.83%;采用连续挤压技术制备的Al-Sc-Zr合金杆,经过累积连续挤压后,合金晶粒尺寸从100μm细化至800 nm,得到了超细晶Al-Sc-Zr合金。结论连续流变挤压技术制备铝材工艺流程短、产品性能优良,能连续高效制备铝合金超细晶材。 相似文献
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Hybrid Copper‐Nanowire–Reduced‐Graphene‐Oxide Coatings: A “Green Solution” Toward Highly Transparent,Highly Conductive,and Flexible Electrodes for (Opto)Electronics
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Alessandro Aliprandi Tiago Moreira Cosimo Anichini Marc‐Antoine Stoeckel Matilde Eredia Ugo Sassi Matteo Bruna Carlos Pinheiro César A. T. Laia Sara Bonacchi Paolo Samorì 《Advanced materials (Deerfield Beach, Fla.)》2017,29(41)
This study reports a novel green chemistry approach to assemble copper‐nanowires/reduced‐graphene‐oxide hybrid coatings onto inorganic and organic supports. Such films are robust and combine sheet resistances (<30 Ω sq?1) and transparencies in the visible region (transmittance > 70%) that are rivalling those of indium–tin oxide. These electrodes are suitable for flexible electronic applications as they show a sheet resistance change of <4% after 10 000 bending cycles at a bending radius of 1.0 cm, when supported on polyethylene terephthalate foils. Significantly, the wet‐chemistry method involves the preparation of dispersions in environmentally friendly solvents and avoids the use of harmful reagents. Such inks are processed at room temperature on a wide variety of surfaces by spray coating. As a proof‐of‐concept, this study demonstrates the successful use of such coatings as electrodes in high‐performance electrochromic devices. The robustness of the electrodes is demonstrated by performing several tens of thousands of cycles of device operation. These unique conducting coatings hold potential for being exploited as transparent electrodes in numerous optoelectronic applications such as solar cells, light‐emitting diodes, and displays. 相似文献
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利用磷酸二氢铝的固化反应在316不锈钢表面制备了不同含量Cu2+的磷酸铝涂层(Cu: Al=0.025、0.05、0.1)。差示扫描量热分析及X射线衍射表明涂层材料可在≤250℃下固化, 主要固化产物为AlH2P3O10∙2H2O、AlPO4和Al8H12(P2O7)9。Cu2+加入后产生了含铜的新相Cu2P2O7。与大肠杆菌共培养12 h后各含Cu2+涂层表现出抗菌性, 且抗菌能力与Cu2+含量正相关; 接触24 h后, 所有含Cu2+涂层表面均无活菌检出。菌悬液中加入EDTA有效抑制了涂层抗菌活性, 表明涂层抗菌性能来自表面溶出的Cu2+。拉伸试验表明涂层结合强度在14.5~18.1 MPa范围。与无涂层的不锈钢相比, 涂覆涂层后样品的腐蚀电流密度下降了2个数量级。 相似文献