Carbon fibers with high electrical conductivity
// Material Technology
Ref-Nr: 16261
Abstract
The invention concerns the manufacture of electrical conductors as "lightweight construction". An experimental setup is set up in the laboratory. Fig. 1 shows a test setup for measuring the electrical conductivity of the fibers.
Fig. 1: Measuring apparatus for determining the specific resistance of the conductive carbon fibres. A bundle of a large number of submicriscopic fibers (black cable) is connected to a circuit via two terminals.
background
Carbon fibres in various technical areas are specially synthesised, and their design is usually based on their mechanical properties. A high proportion of graphite already ensures electrical conductivity, which is even lower than that of metallic conductors such as copper or aluminium.
Innovation / Solution
Electrically conductive carbon-based fibers (in the submicrometer range) are produced in four steps: electrospinning, cyclisation, denitrification and carbonisation. Cyclization takes place under several hours of tensile stress, so that the fibers become thinner and longer. Molecular ordering processes occur. In the last two steps (high-temperature treatments), the atmosphere (vacuum or inert gas) suppresses oxide formation.Benefits
higher conductivity than metals
low density (lightweight construction)
in high-frequency technology: high charge carrier mobility and suppression of the skin effect due to the high specific surface area
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