Stress-Induced Effects upon the Structure and Properties of Carbon Fibers.
Final technical rept. 1 Mar 76-31 May 80,
WASHINGTON UNIV SEATTLE DEPT OF MINING METALLURGICAL AND CERAMIC ENGINEERING
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Microstructures and structural development with heat treatment of carbon fibers from pitch, rayon, polyacrylonitrile and pitch mesophase were characterized by diamagnetic susceptibility and SEM and the dynamic torsional behavior modulus, damping at about 1 Hz and electrical resistance properties resistivity, temperature dependence, piezoresistance of individual fibers were measured and compared. A survey of the structure-dependence of the fiber properties revealed similarities that appear to be common to all stratic hexagonal layer carbon materials, as well as characteristic differences associated with fiber precursor type and processing. Author