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Prospects for using carbon-carbon composites for EMI shieldingSince pyrolyzed carbon has a higher electrical conductivity than most polymers, carbon-carbon composites would be expected to have higher electromagnetic interference (EMI) shielding ability than polymeric resin composites. A rule of mixtures model of composite conductivity was used to calculate the effect on EMI shielding of substituting a pyrolyzed carbon matrix for a polymeric matrix. It was found that the improvements were small, no more than about 2 percent for the lowest conductivity fibers (ex-rayon) and less than 0.2 percent for the highest conductivity fibers (vapor grown carbon fibers). The structure of the rule of mixtures is such that the matrix conductivity would only be important in those cases where it is much higher than the fiber conductivity, as in metal matrix composites.
Document ID
19910009918
Document Type
Conference Paper
Authors
Gaier, James R. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Subject Category
COMPOSITE MATERIALS
Report/Patent Number
E-5893
NASA-TM-103677
NAS 1.15:103677
Meeting Information
International Conference on Carbon, Post Symposium on Carbon-Carbon Composites(Tsukuba)
Funding Number(s)
PROJECT: RTOP 506-41-41
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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