广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fiber manufacturing processes Rayon based carbon fibers Stabilization at 400 c in o depolymerization aromatization Carbonization at 400-700 c in an inert atmosphere Stretch and graphitization at 700- 2800C(improve orientation and increase crystallinity by 30-50%)
Carbon fiber manufacturing processes ◼ Rayon based carbon fibers Stabilization at 400°C in O2 , depolymerization & aromatization Carbonization at 400-700°C in an inert atmosphere Stretch and graphitization at 700- 2800°C (improve orientation and increase crystallinity by 30-50%)
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fiber manufacturing processes PaiN (pOlyaryiontrile)based carbon fibers 口 Pan fibers Stabilization at 200-300C in O2u depolymerization aromatization converting thermoplastic Pan to a nonplastic cyclic or ladder compound Carbonization at 1000-1500 c in an inert atmosphere to get rid of noncarbon elements Stretch and graphitization at >1800 C formation of turbostratic structure
Carbon fiber manufacturing processes ◼ PAN (polyarylonitrile) based carbon fibers PAN fibers Stabilization at 200-300°C in O2 , depolymerization & aromatization, converting thermoplastic PAN to a nonplastic cyclic or ladder compound Carbonization at 1000-1500°C in an inert atmosphere to get rid of noncarbon elements Stretch and graphitization at >1800°C, formation of turbostratic structure
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Stabilization of pan fibers Figure 2 Intermolecular interaction of nitrile groups. 人
Stabilization of PAN fibers
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Pitch based carbon fibers. a pitch- high molecular weight byproduct of distillation of petroleum heated >350 c condensation reaction formation of mesophase(liquid crystal: Structure of mesophase pitch melt spinning into pitch fibers Oxidation at a temperature below softening temperature conversion into graphite fibers at 2000 C without tension
Pitch based carbon fibers pitch - high molecular weight byproduct of distillation of petroleum ◼ heated >350°C, condensation reaction, formation of mesophase (Liquid crystal): Structure of mesophase pitch melt spinning into pitch fibers Oxidation at a temperature below softening temperature conversion into graphite fibers at ~2000°C without tension
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Pitch based carbon fibers ■ Advantages a Much higher degree of graphitization than polymer based carbon fibers a High strength and modulus O High thermal conductivity: even much better than copper
Pitch based carbon fibers ◼ Advantages Much higher degree of graphitization than polymer based carbon fibers High strength and modulus High thermal conductivity: even much better than copper