共查询到20条相似文献,搜索用时 15 毫秒
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《Propellants, Explosives, Pyrotechnics》2017,42(3):318-328
Exploding Foil Initiator (EFI) flyer layer velocities measured down the barrel of an EFI are presented. Flyer velocity was shown to be proportional to supply voltage and of a similar order to other studies previously conducted. Bridge volume ejection was shown to be proportional to capacitor voltage. Current density increased with respect to capacitor voltage up to a point of saturation between 2400 V and 3000 V (evidenced electrically). Beyond the saturation voltage, high voltages demonstrated sustained energy delivery at a reduced current. This work indicates that control of active bridge volume or electrical supply signal may enable more closely controlled EFI flyer layer ejection behavior, and it demonstrates the relevance of using current per active bridge (specific current) as a metric to describe EFI electrical performance with relevance to dynamic response of the EFI. The impulse delivered by an EFI can be modulated via manipulation of the firing circuit input signal giving rise to system behavior variation. 相似文献
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金属箔电爆炸驱动飞片模型的设计及应用 总被引:1,自引:0,他引:1
在研究电爆炸过程中桥箔非线性电阻变化的基础上,得到了一种描述桥箔电功率变化的理论计算模型。根据LLNL测量飞片速度的部分实验结果,估算出桥箔用于驱动飞片做功能量占桥箔吸收总能量的比率,即爆发前β1≈9.9×10^-3爆发后β2≈8.6×10^-3.把带有能量转换系数的电功率计算模型应用到流体动力学程序,并对电爆炸驱动小尺寸飞片的飞行历程进行了一维数值模拟,模拟结果与LLNL实验值的偏差在±8%以内,与国内用VISAR测量的飞片速度历程吻合得较好。 相似文献
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研究了葡萄糖对铝箔交流腐蚀扩面的影响,采用循环伏安法对电容结果进行表征。发现葡萄糖的加入,有助于铝箔的腐蚀和扩孔,比电容有较大幅度的提高,并且葡萄糖对低纯度铝箔影响更大,1.0g/L葡萄糖导致低纯铝箔(99.2%)比容约提高30%,高纯铝箔(99.99%)提高约10%。 相似文献
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Hsien-Tang Chiu Jui-O Cheng Yu-Chun Tao You-Chen Lin 《Polymer-Plastics Technology and Engineering》2013,52(4):335-343
The purpose of this study is to explore the effect on capacitance features of the solid state high performance polypyrrole capacitor with the chemically synthesized aluminum foil. Atomic force microscope (AFM) was used to analyze the surface structure of the chemically synthesized aluminum foil for the experiment and distribution of polypyrrole on the surface of the foil was observed and analyzed through scanning electron microscope (SEM) and energy dispersive x-ray spectrometer (EDS). Finally, evaluation of electric performance was conducted so as to establish the parameters for the surface structure of the chemically synthesized foil with the best series capacitance features. 相似文献
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由于铜价格的高涨使铝材成为铜的重要替代材料,在印制线路板制造中也成为一种趋势.随着柔性印制线路板应用的扩展,铝箔在柔性印制线路板中的应用也成为可能.介绍了采用铝箔的柔性印制线路板的制作工艺和应用情况.用铝箔替代铜箔,既减轻了产品质量,又可以降低成本,具有重要意义. 相似文献
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光学参数是评价汽车贴膜质量的一项重要指标。本实验主要以市面上部分中高档次的汽车侧窗贴膜为样品,使用带积分球检测器的紫外/可见光/红外分光光度计得到其200~2500 nm的透射和反射光谱,通过计算得到其可见光透射比、反射比,太阳光直接透射比、反射比,紫外线透射比。以此为依据分析现市面上主要中高档侧窗汽车贴膜在紫外线阻隔、安全性和隔热等方面的性能。结果表明:所有样品的紫外阻隔率〉99%,有57%的样品可见光透射比〉70%,太阳光直接透射比均偏低,说明所采集的样品在防紫外、安全性、隔热性方面性能在标准以上。 相似文献
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聚合物材料冲击缺口敏感性的研究 总被引:1,自引:0,他引:1
本文对8种聚合物材料进行了系列冲击试验,结果认为,聚合物材料的缺口敏感性用σn(缺口冲击强度)/σo(无缺口冲击强度)和Ks(切口尖锐度敏感因子)两种方法评价得出的结论基本一致。单相聚合物材料(PC,PP和POM)的缺口敏感较多相聚合物材料(PVC,GFPA,GFPC,HIPS,ABS)的大;Ks只在相同断裂机制条件下适用;温度对多数聚合物材料的缺口试样裂纹萌生功影响不大。 相似文献
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马来酸酐接枝聚乙烯与铝箔热复合的研究 总被引:5,自引:1,他引:5
本文报道了马来酸酐接枝聚乙烯(MAH-g-PE)与铝箔的热粘接性能,并实验确定了热复合所需的温度、压力、时间条件以及接枝率的影响。另外,发现混入10%乙烯醋酸乙烯共聚物(EVA)可明显提高与铝箔的粘接性。 相似文献
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本文制备了铜箔胶粘剂中所用的几种树脂,如封端和未封端的两种异氰酸酯预聚体,三种改性的三聚氰胺甲醛树脂和聚醚树脂。通过一系列研究确定了胶粘剂的理想配方,并通过红外光谱、热失重和差热分析法对其铜箔胶粘剂的反应过程和热稳定性进行了探讨. 相似文献
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为了实时分析圆柱型药柱空中爆炸火团的持续时间和大小,拓展圆柱型药柱空中爆轰参数的研究领域,在质量相同、试验条件相同和拍摄参数相同的条件下,采用高速动态分析仪,以4 000 f/s的拍摄速度获取了3种类型(即RDX型、HMX型和TNT型)各3发圆柱型药柱的空中爆炸图像,并计算出其空中爆炸火团的平均持续时间分别为:122.08 ms、164.50 ms和238.92 ms.应用ACDsee和AutoCAD工具软件,用尺寸标注的方法分别测算出各个爆炸火团的水平和垂直最大半径,结果是HMX型最大,分别为10.36 m和9.42 m;从图像中还可以观察到各类爆炸火团具有不同的几何形状. 相似文献
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管翅式换热器铝箔表面除湿涂层研究 总被引:1,自引:0,他引:1
采用静电喷涂工艺,将硅胶粉和粉末涂料组成的混合物喷涂到铝箔表面,加热固化后进一步浸渍到氯化锂或氯化钙饱和盐溶液中,获得除湿换热器铝箔表面吸湿涂层。对吸湿涂层进行扫描电子显微镜及其能谱、比表面积孔隙分析及热失重等表征。结果表明:涂层能够均匀分散在铝箔表面;改性后的吸湿涂层平均孔径略有增大,孔容和比表面积略有减小;吸湿涂层质量损失主要集中在较低温度段(30~200℃)和较高温度段(300~600℃),前者与吸附剂脱附有关,后者与涂料热分解有关。静态、动态吸附测试表明,改性后吸湿涂层的吸附性能都有较大的改善。 相似文献
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The controlled/“living” radical polymerization of methyl methacrylate (MMA), 2-hydroxyethyl methacrylate (HEMA), and styrene by atom transfer radical polymerization (ATRP) is reported. The effect of initiators and reaction conditions on the ATRP results was investigated. Controlled polymerizations with predictable molecular weights were performed on MMA at 40 ○C and 80 ○C using a CuCl/bipyridine (bipy) catalyst system in conjunction with 1-bromoethyl benzene as the initiator. The addition of a polar solvent was necessary to decrease the polymerization rate and afford low polydispersity materials. The ATRP processes followed a first-order kinetics with respect to the monomer concentration. The molecular weights of the resulting polymers were very close to their calculated values and increased with the conversion. The ATRP results of styrene showed a similar trend and revealed that CuBr/bipy or CuBr/PMDETA was a more suitable catalyst system than CuCl/bipy. In addition, it was found that controlled polymerizations could be readily carried out both in a nonpolar solvent or in bulk. Furthermore, by using the bromine-terminated polymer as the macroinitiator, diblock copolymers of PSt-b-PMMA, PSt-b-PHEMA, PMMA-b-PSt, and PMMA-b-PHEMA could be obtained. Thermal analysis and X-ray diffraction studies confirmed the amorphous structures of the resulting polymers. 相似文献