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讨论了粉末涂装中回收粉末产生的几种原因,重点分析了因粉末粒度与筛网孔径不匹配造成的回收粉过多的情况。针对各种具体原因给出相应的控制办法,同时提出了合理处理回收粉末的途径,经区别利用,粉末涂料的利用率可以达到100%。 相似文献
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粉末活性炭与炭基粉末催化剂同反应液的精密过滤是化工、医药等工业生产普遍需要的化工操作。由于这些过滤的要求非常高,而粉末炭微粒非常细,在滤饼层和滤材中易穿移,"漏炭"成为这些化工操作中长期难以解决的难题。叙述粉末炭的特点,简单介绍了本公司为解决这些难题在最近十年的主要进展。 相似文献
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Mechanical behavior of two-dimensional carbon/carbon composites with interfacial carbon layers 总被引:1,自引:0,他引:1
Effect of interfacial carbon layers on the mechanical properties and fracture behavior of two-dimensional carbon fiber fabrics reinforced carbon matrix composites were investigated. Phenolic resin reinforced with two-dimensional plain woven carbon fiber fabrics was used as starting materials for carbon/carbon composites and was prepared using vacuum bag hot pressing technique. In order to study the effect of interfacial bonding, a carbon layer was applied to the carbon fabrics in advance. The carbon layers were prepared using petroleum pitch with different concentrations as precursors. The experimental results indicate that the carbon/carbon composites with interfacial carbon layers possess higher fracture energy than that without carbon layers after carbonization at 1000°C. For a pitch concentration of 0.15 g/ml, the carbon/carbon composites have both higher flexural strength and fracture energy than composites without carbon layers. Both flexural strength and fracture energy increased for composites with and without carbon layers after graphitization. The amount of increase in fracture energy was more significant for composites with interfacial carbon layers. Results indicate that a suitable pitch concentration should be used in order to tailor the mechanical behavior of carbon/carbon composites with interfacial carbon layers. 相似文献
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面向全新的碳中和愿景,二氧化碳利用作为一种重要的低碳技术,受到了学术界和工业界的广泛关注,开展技术的低碳成效评估对于技术研发及布局的顶层设计具有重要意义。然而已有研究主要基于技术特征开展定性的优先序判断,缺乏系统性的评估方法。本文首先对国内外二氧化碳利用技术发展现状开展梳理,围绕技术特性、碳中和效应、经济效应和社会效应四个方面,采用层次分析和目标趋近相结合的方法,构建了针对二氧化碳利用技术低碳成效综合评估的方法学;并对我国典型的二氧化碳利用技术低碳成效现状以及未来潜力开展应用评估,通过不同二氧化碳利用技术低碳成效的横向对比以及技术不同阶段低碳成效的纵向对比,研究发现:目前我国二氧化碳利用技术低碳成效整体水平偏低,不同二氧化碳利用技术低碳成效的差异主要来自技术特性和碳中和效应两大方面;我国现有的典型二氧化碳利用技术中,二氧化碳加氢合成甲醇技术和二氧化碳与甲烷重整制备合成气技术的低碳成效相对显著;通过对未来不同阶段二氧化碳利用技术低碳成效的对比分析,发现不同二氧化碳利用技术的低碳成效变化有较大差异,其中二氧化碳矿化养护混凝土和二氧化碳光电催化转化技术的低碳成效有明显提升。 相似文献
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结构炭/炭复合材料力学性能及微观结构研究 总被引:14,自引:1,他引:13
采用四向编织、快速化学气相渗透致密化新工艺制备了炭/炭复合材料,其弯曲强度达320MPa。分析研究了这种材料的力学性能特征。利用SEM和高分辨TEM分析了基体炭、炭纤维/基体灰界面的精细结构,发现炭纤维呈单根被基体炭包围,基体现灰呈层片状,为二维有序的乱层石墨结构;在炭纤维与基体炭之间存在着过渡相,这一过渡相厚度的约几十纳米,随着与炭纤维之间距离的增大,它们之间形成的夹角由小变大,这一过渡相即为炭 相似文献
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In this work, Lyocell fibers filled with various amounts of carbon black were prepared. Wide angle X‐ray diffraction (WAXD) results showed that carbon black filled Lyocell fibers still had a cellulose II crystal structure and kept the characteristic peak of carbon black at the same time. The results of mechanical properties showed a slight reduction in the carbon black filled Lyocell fiber. Moreover, the heat stabilities of the carbon black filled Lyocell fibers showed no obvious change. The residue of carbon black filled Lyocell fiber at 1000°C was higher than that of Lyocell fiber, implying higher carbon yield could be obtained for the carbon black filled Lyocell precursor. Scanning electron microscopy (SEM) experiments showed that the surface and the cross section of carbon black filled Lyocell fiber were smooth and round, which are consistent with the carbon fiber precursor. The WAXD pattern of carbon black filled Lyocell‐based carbon fiber was different from that of Lyocell‐based carbon fiber. The addition of carbon black transfers the diffraction peak of carbon fiber while keeping the characteristic structure of carbon black. The results of mechanical properties of carbon fibers show that, if an appropriate amount of carbon black was chosen, carbon fiber with better properties than Lyocell‐based carbon fiber could be obtained by using the carbon black filled Lyocell fibers as the precursor. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 65–74, 2006 相似文献
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介绍了超级电容器的炭基电极材料:活性炭、活性炭纤维、炭气凝胶、碳纳米管和模板炭,总结了其最新研究进展。目前,研究较多的是活性炭、碳纳米管和模板炭。炭材料的孔结构、内阻和电解液的种类等都是影响超级电容器性能的关键因素,超级电容器要实现大规模应用还需解决许多问题。 相似文献
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工作以CR/BR并用胶为基体材料、炭黑为补强填料制备炭黑/CR/BR复合材料,探究炭黑的添加顺序与薄通工艺对炭黑在CR/BR并用胶中的分散性及其硫化胶性能的影响。结果表明:在不同混炼工艺制备炭黑/CR/BR并用胶中,采用先将炭黑混入BR相中再与CR共混的工艺很好的提高了炭黑的分散性,炭黑/CR/BR复合材料的硫化特性和物理性能随炭黑分散性变好而得到提高;薄通5次时各种配合剂在并用胶中分散性良好。 相似文献