carbon fibers 1-8-08

carbon fibers 1-8-08 - Carbon Fibers Douglas J. Gardner...

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1 Carbon Fibers Douglas J. Gardner Professor Wood-Polymer Hybrid Composites Carbon
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2 Carbon Fibers • Carbon fibers are typically derived from one of two precursor materials – PAN (Polyacrylonitrile fibers) – PITCH • Some research looking at lignin PAN versus Pitch Manufacturing
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3 The basic unit of PAN is: The PAN Manufacturing Process • The conversion of PAN to carbon fibers is normally made in 4 continuous stages: – Oxidation – Carbonization (Graphitization) – Surface treatment – Sizing
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4 Oxidation • OXIDATION involves heating the fibers to around 300 deg C in air. This evolves hydrogen from the fibers and adds less volatile oxygen. Carbonization • CARBONIZATION (GRAPHITIZATION) involves heating the fibers up to 3000 ° C in an inert atmosphere, the fibers are now nearly 100 % carbon.
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5 PAN Fiber Grade • The carbonization temperature will determine the grade of fiber produced: Carbonization Temperature (°C) to 1000 1000 - 1500 1500 - 2000 2000 + (Graphitization) Grade of Carbon Fiber Low Modulus Standard Modulus Intermediate
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carbon fibers 1-8-08 - Carbon Fibers Douglas J. Gardner...

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