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Study on the Semiconducive Composite of CNFS/EVA Used in Hvdc Cable

Author: DongHongZhou
Tutor: HaoChunCheng
School: Qingdao University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Carbon Nanofibers Nickel deposition Composites Dielectric loss factor Relative permittivity
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 96
Quote: 0
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Abstract


HVDC is the direction of research to solve the long-distance power transmission , insulation material to promote the development of HVDC technology improve . In this paper, nano carbon fiber orientation dispersion in the polymer , and preliminary studies of the dielectric properties of the material , the orientation of the carbon nanofibers dispersed been applied to DC transmission cable . Thesis nano carbon fibers subjected to surface modification , the nickel layer is deposited on the fiber surface , the surface of the carbon nanofibers metalization . Found by detecting the modified nano-carbon fibers deposited on the surface of a layer of of about 8nm nickel layer attached to a part of the reunion nano nickel particles on the nickel layer . With the modified use NiCl 2 solution concentration increases , the nickel layer attached to the reunion nano nickel particles growing ; fibers dispersed manner in the process of modification of the fiber morphology also have an impact than the effect of mechanical agitation , ultrasonic dispersing effect is good, and less of the agglomerated particles of the surface of the obtained fiber . After the surface-modified nano-carbon fiber dispersed in the role of the magnetic field to the EVA , can be seen by observing the orientation of the fibers . Analysis of nano - carbon fiber / EVA dielectric spectroscopy orientation composite samples and non-oriented composite dielectric properties change . The doping concentration of the carbon nanofiber is 0.1wt% and 0.5wt% , the orientation is lower than the relative permittivity of the composite material of the non-oriented composite material , the doping concentration of 1.0wt% and 5.0 % by weight , orientation composite material than the non-oriented composite high relative dielectric constant of the material ; doping concentration of 1.0wt% and 5.0wt% , the composite material of the orientation of the low-frequency region , the dielectric loss factor is higher than the composite material of the non-oriented , the orientation of the high-frequency region composite material dielectric loss factor is less than the non-oriented composite materials.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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