广东费飘职业故本学院 Guangdong Inatitute of Textile Technology High Performance Fibers and Fibrous materials
High Performance Fibers and Fibrous materials
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Outline 口 Carbon fibers 口 Glass fibers 口 Aramid fibers a Ultra High Modulus polyethylene fibers 口 Carbon nanotubes 口 Ceramic fibers O Mechanical properties of fibers
Outline Carbon fibers Glass fibers Aramid fibers Ultra High Modulus Polyethylene fibers Carbon nanotubes Ceramic fibers Mechanical properties of fibers
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fibers 口 Reading assignment a Hull and clyne chapter 2 Fibres and Matrices an introduction to Composite Materials, 2nd ed. Cambridge University press. Pages 9 -30
Carbon fibers Reading assignment Hull and Clyne, Chapter 2 Fibres and Matrices, An Introduction to Composite Materials, 2nd ed. Cambridge University Press. Pages 9 –30
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology carbon fibers a Manufacturing processes a Structure and properties
Carbon fibers Manufacturing processes Structure and properties
广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Carbon fibers Manufacturing processes a Thermal decomposition of fibrous organIc precursors 日 Extrusion of pitch
Carbon fibers ◼ Manufacturing processes Thermal decomposition of fibrous organic precursors Extrusion of pitch
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