共查询到19条相似文献,搜索用时 187 毫秒
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金属纤维/聚合物导电复合材料的性能研究 总被引:14,自引:2,他引:12
以铜纤维和不锈钢纤维为导电填料,分别填充了ABS、HIPS和PPS对脂基体,制得导电复合材料。研究了金属纤维含量及工艺条件对复合材料的导电性能和力学性能的影响。结果表明,选择合适的工艺条件以保证金属纤维有较大的长径比并在树脂中有良好的分散状态,是制造性能优良的导电复合材料的关键。 相似文献
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镀铜/镍聚丙烯腈纤维填充复合材料电磁波屏蔽性能的研究 总被引:2,自引:0,他引:2
研究了镀铜/镍的聚丙烯腈纤维填充ABS树脂制得的复合材料的导电性及电磁波屏蔽性能,复合材料的导电性主要与导电纤维的填加量有关,导电纤维与基体树脂间的相容状况、复合加工时某些工艺条件等对复合材料的导电性也有较大的影响,电磁波屏蔽性能随导电纤维填加量的增加而提高,加入适当的偶联剂有助于改善和复合材料的电磁波屏蔽性能。 相似文献
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镀镍PET纤维/环氧树脂复合材料的性能 总被引:4,自引:0,他引:4
以PET纤维经超声波化学镀镍制成的导电PET/Ni纤维作填料,与环氧树脂共混,制得导电环氧树脂复合材料.对纤维表面镀层的形态结构及复合材料的导电性、电磁屏蔽性及力学性能进行了深入的研究.结果表明,填充适量(1%~5%,质量分数,下同)的纤维就可以得到导电性能良好的复合材料,同时也具有较好的电磁屏蔽性能,当纤维含量为3%时材料的力学性能也得到改善. 相似文献
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表面改性和复合工艺对金属纤维/聚合物复合材料性能的影响 总被引:6,自引:0,他引:6
以不锈钢纤维为导电填料,分别与ABS和PP复合,制得了电磁屏蔽用导电高分子复合材料。考察了表面改性和复合工艺对金属纤维/聚合物复合材料性能的影响。结果表明,用不同表面处理剂处理不锈钢纤维后,随纤维表面张力增加,复合材料的电阻率增加。使用母料法工艺可以有效地改善金属纤维在聚合物基体中的分散,从而提高复合材料的导电性能和电磁屏蔽性能。 相似文献
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孙世清 《高分子材料科学与工程》2006,22(3):176-178
通过大量拉拔变形制备了Cu-F e-C r原位复合材料并萃取出其中的F e-C r纤维,以超细F e-C r纤维为导电填料,填充环氧树脂,140℃热压制得导电复合材料。在扫描电镜下观察了复合材料的显微组织,用四探针方法测量了复合材料的导电性能。结果表明,随着F e-C r纤维填充量的增大,复合材料的电阻率下降,F e-C r纤维体积分数为41.7%的复合材料体积电阻率达到8.32×1-0 3Ω.cm。 相似文献
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填充型导电硅橡胶是一种同时拥有良好导电性能和物理性能的复合材料,在航空、电子等领域展示了广泛的应用前景。介绍了炭系、金属系、微/纳米体系、并用体系导电填料的添加对导电硅橡胶复合材料导电性能及物理机械性能的影响。指出了导电填料的种类、含量以及改性工艺对导电硅橡胶导电-物理性能的影响程度。阐述了研究进展状况,并对导电复合材料的未来研究方向提出了展望。 相似文献
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研究经化学镀镍的聚丙烯腈导电纤维填充的高抗冲聚苯乙烯复合材料的导电性与导电填料浓度的导电性与导电填料浓度的关系及加入有机钛酸酯偶联剂的影响,为了进一步提高复合材料的导电性,在PAN/Ni-P纤维填充的复合材料中又加入不同量的碳黑,由于碳黑粒子的加入改善了纤维间的接触状态,更有利于导电网络的形成,从而大大提高了复合材料的导电能力。 相似文献
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The electrical conductivity and morphology of injection molded polypropylene based composites containing two conductive fillers,
carbon black (CB) and carbon fibers (CF) were studied. Injection moldings containing both, CB and CF, where the content of
each filler was above its own percolation threshold, resulted in similar or lower values of overall composite volume resistivity
compared with the resistivity of systems filled only with CB at the corresponding content. However, the resistivity of two-filler
systems is always higher than the resistivity of systems filled only with CF at the corresponding content. The morphology
and fiber length analysis of the injection molded composites are quite intriguing. Fiber orientation in the injection molded
two-filler systems was found to be almost perpendicular to the melt flow direction, with no significant skin-core fiber orientation
patterns, contrary to the typically observed fiber orientation in injection molded fiber filled composites. Moreover, the
CF breakage in the presence of the CB was found more intense than when just CF is used, resulting in shorter fibers with narrower
length distributions. This unexpected fiber behavior is responsible for the unexpected electrical behavior. However, the coexistence
of CB and CF electrically conductive networks, supporting each other, was confirmed, in spite of the mechanical disturbances
caused by the presence of fibrilar and particulate fillers. 相似文献
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The electrical behavior of continuous carbon fiber epoxy-matrix composites in the through-thickness direction was studied by measuring the contact electrical resistivity (DC) of the interlaminar interface in the through-thickness direction. The contact resistivity was found to decrease with increasing curing pressure and to be higher for unidirectional than crossply composites. The lower the contact resistivity, the greater was the extent of direct contact between fibers of adjacent laminae. The activation energy for electrical conduction in the through-thickness direction was found to increase with increasing curing pressure and to be lower for unidirectional than crossply composites. The higher the activation energy, the greater was the residual interlaminar stress. Apparent negative electrical resistance was observed, quantified, and controlled through composite engineering. Its mechanism involves electrons traveling in the unexpected direction relative to the applied voltage gradient, due to backflow across a composite interface. The observation was made in the through-thickness direction of a continuous carbon fiber epoxy-matrix two-lamina composite, such that the fibers in the adjacent laminae were not in the same direction and that the curing pressure during composite fabrication was unusually high (1.4 MPa). 相似文献
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通过烧成制备了电阻率量级大小不同的三种连续SiC纤维, 对纤维的元素组成、结晶性能和表面结构进行了分析. 结果表明: 通过调整不熔化及烧成工艺参数可以获得电阻率量级不同的连续SiC纤维. 当纤维表层具有一定厚度的高富碳层结构时, 纤维的电阻率受整体自由碳含量与结晶性能的影响不再显著, 此时, 纤维将具有较低的电阻率. 富碳层的产生与不熔化纤维烧成时分解产生的烃类小分子的重新裂解沉积有关. 通过低温氧化除去纤维表面的富碳层可以使纤维电阻率增大. 表面结构对连续SiC纤维的电阻率大小有重要影响. 相似文献
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Electrodeposition of exfoliated graphite nanoplatelets onto carbon fibers and properties of their epoxy composites 总被引:1,自引:0,他引:1
Jong Kyoo Park In-Hwan Do Per Askeland Lawrence T. Drzal 《Composites Science and Technology》2008,68(7-8):1734-1741
Exfoliated graphite nanoplatelet (xGnP)/copper (Cu) coated carbon fibers were fabricated by electrophoretic deposition under different applied voltages. The electrical and mechanical properties of individual fibers and composites made from these fibers and epoxy resin were investigated. The electrical resistivity of xGnP/Cu coated single carbon fiber is lower than that of the uncoated control sample and decreases with increase in the applied voltage. The xGnP and metallic Cu were simultaneously deposited on the carbon fiber surface as a result of the electrochemical cell configuration. The interfacial shear strength decreases with applied voltage up to 30 V but increases with applied voltage of over 30 V. The interfacial shear strength for the coated samples except the 50 V treated sample is lower than that of control sample. The flexural strength and modulus of xGnP/Cu coated carbon/epoxy composites is higher than those of control sample due to the reinforcing effect of xGnP/Cu coated on the carbon fibers. 相似文献
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用碳纤维填充尼龙1010制备了碳纤维增强尼龙复合材料,并对碳纤维增强尼龙复合材料的力学性能和摩擦学性能进行了实验研究。力学实验结果表明:碳纤维增强使尼龙复合材料的拉伸强度、表面硬度增大,碳纤维增强尼龙材料的拉伸强度在20%碳纤维含量时达到最大值;碳纤维表面处理对尼龙复合材料的拉伸强度有很大影响,碳纤维表面氧化处理提高了碳纤维增强尼龙复合材料的拉伸强度。摩擦磨损实验表明:碳纤维增强尼龙复合材料的摩擦系数和磨损率与其拉伸强度和硬度有密切关系。随着拉伸强度和硬度的提高,尼龙复合材料摩擦系数和磨损率降低;摩擦系数和磨损率与拉伸强度具有反比关系,与材料硬度具有二次方程关系,与碳纤维填充量之间存在负指数变化规律。 相似文献
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