Nano Science (Lec 13 Nanocomposites)

Nano Science (Lec 13 Nanocomposites) - MAE 287/EE 257 1...

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MAE 287/EE 257 1
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2 Definition and categories of composites History of composites materials Reinforcement and Matrix Composites Manufacturing : 1. Pressure molding 2. Resin transfer molding 3. Filament winding 4. Pultrusion Material properties : mechanical, electrical, thermal properties CNT/CNF composites Ceramic/Metal composites Other composites
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General definition A heterogeneous material consisting of a reinforcing material in the form of fibers, whiskers, platelets, and particulates dispersed in a continuous matrix materials. Unique mechanical, chemical, thermal, optical, or electrical properties that individually would not be possible. Nanocomposites Multiphase materials where the phases have dimension < 100 nm Nanolayers Nanofibers Nanoparticles 3
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4 Similar with fiber pultrusion http://www.harunyahya.com/books/science/biomimetics/biomimetics01.php
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800 B.C. Straw-reinforced mud bricks in Egypt 1930 Fiberglass (Owens Corning Fiberglass Company, US) 1937 Fiberglass polymer (phenolic resin) for aircraft manufacturing tools (die, mold) 1938 Epoxy invented 1939-1945 WWII Fiber reinforced polymer (FRP) in airplane and boat 1960’s Aerospace industry led composites research. Boron, graphite, aramid (Kevlar, DuPont) fibers. PMC, MMC, CMC 1970’s CCC 1980’s Stealth materials in Air force and Navy Present Nano composites in energy / bio apps. 5 Boeing 787 Dreamliner
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6 Materials E (GPa) E/ρ (GPa m 3 /kg) Epoxy 2.4 0.0022 Graphite fiber 230 0.1278 Glass fiber 85 0.0340 Graphite/epoxy 181 0.1131 Glass/epoxy 38.60 0.0214 Steel 200 0.0265 Al 68.95 0.0266
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• Matrix Phase – Polymers (PMC) – Metals (MMC) – Ceramics (CMC) – Carbon (CCC) • Reinforcement Phase – Fibers: Nanotubes – Platelets: Nanoplatelets – Particles: Nanoparticles. • Interphase – Chemical Bonding – Physical Bonding 7
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10 Spray Prepreg (half-cured resin and reinforcement) Autoclave curing
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11 http://www.netcomposites.com/education.asp?sequence=59 Fiber (reinforcement, C fiber with CNT) Architecture: Permeability Capillary forces
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This note was uploaded on 04/17/2011 for the course MAE 287 taught by Professor Yongchen during the Winter '11 term at UCLA.

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Nano Science (Lec 13 Nanocomposites) - MAE 287/EE 257 1...

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