Process for the preparation of flexible carbon yarn and carbon products therefrom
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United States of America Patent
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Jun 19, 2001
Grant Date -
N/A
app pub date -
Mar 28, 1994
filing date -
Mar 28, 1994
priority date (Note) -
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Abstract
A process for the preparation of a carbon yarn product includes the steps of pyrolizing raw carbonaceous yarn comprising a plurality of carbon fibers, at a temperature above about 650.degree. F.; flexing the pyrolized yarn to substantially break fiber-to-fiber bonding between the fibers; and, exposing the yarn to a temperature sufficient to carbonize the pre-carbonized yarn to a final and higher carbon assay. A flexible yarn element (10) includes a plurality of carbon filaments (11) wherein each filament (11) is in contact with at least one other filament 11. A sizing material at least partially coats the plurality of filaments (11), wherein the sizing material of each filament (11) is substantially separated from the sizing material of the at least one other filament (11) in contact therewith.
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