Process for the surface modification of carbon fibers
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United States of America Patent
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Feb 15, 1983
Grant Date -
N/A
app pub date -
Jan 5, 1981
filing date -
Jan 5, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved continuous hot gas surface modification process for carbon fibers is provided. The carbon fibers undergoing such processing are passed for a relatively brief residence time through a surface treatment zone to which continuously is fed nitrogen dioxide and air under conditions which have been found to produce a surprisingly effective surface modification. The resulting carbon fibers exhibit a significantly enhanced surface area and an improved ability to bond to a resinous matrix material while retaining a substantial portion of the tensile strength originally exhibited. When incorporated in a resinous matrix material, a fiber reinforced composite article of enhanced interlaminar shear strength is formed.
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