Apparatus and method for making carbon fibers
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United States of America Patent
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May 29, 2007
Grant Date -
Oct 25, 2001
app pub date -
Feb 9, 2001
filing date -
Feb 10, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for the carbonization of polyacrylonitrile (PAN) precursor fibers. The apparatus comprises a furnace, or series of furnaces in side-by-side arrangement. Each furnace includes a heater, an air inlet and an air diffusion plate. The fiber is located in the furnace above the air diffuser plate, such that heated air is evenly dispersed over the fibers. The method generally comprises the steps of heat treating the PAN precursor in an oxidizing environment to stabilize the fiber, and then further heat treating the stabilized fiber in an oxidizing environment to carbonize the stabilized fiber. The method can be carried out in a single furnace, or can be carried out in a series of furnaces in a continuous process.
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