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Method for Stabilization of Pan-Based Carbon Fibers.
Patent Application, Filed 30 Jun 89,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
This invention relates to carbon fibers, and more particularly, to an improved process for stabilizing polyacrylonitrile PAN based fibers prior to carbonization and high-temperature heat treatment. There has been an increasing demand for construction materials of high strength-to-weight ratio and high Youngs modulus for use in civilian and military applications, particularly for materials that have good thermal stability. Accordingly, there has been a demand for improved reinforcing fibers to be embodied in structural composites which are exposed to conditions of high temperature and high mechanical stress. Carbon fibers are produced in five manufacturing steps polymerization of monomers, such as acrylonitrile orientation of the linear polymer molecules by spinning them into fibers stabilization by heating the fibers to 150-350 C. Patent applications. JES
APPROVED FOR PUBLIC RELEASE