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Carbon Nanotube/Metal Composites

Carbon Nanotube/Metal Composites. Jason Watkins School of Aerospace and Mechanical Engineering University of Oklahoma Aspects of Nanotechnology December 12, 2006. Introduction. Carbon nanotubes (CNTs) have properties that are desirable for many applications.

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Carbon Nanotube/Metal Composites

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  1. Carbon Nanotube/Metal Composites Jason Watkins School of Aerospace and Mechanical Engineering University of Oklahoma Aspects of Nanotechnology December 12, 2006

  2. Introduction • Carbon nanotubes (CNTs) have properties that are desirable for many applications. • Composites allow for blending of materials, and the materials’ properties. • Metals are good prospects for the matrix of this type of composite because of their inherent material properties.

  3. Concepts • Chirality • Refers to the twisting of the molecular pattern around the cylinder. • Affects the properties of the CNTs. • Must use CNTs with consistent chirality to take full advantage of their properties. • Ballistic Conduction • Mean free path

  4. CNT Properties • Young’s modulus of approximately 1 TPa and breaking strength of 30 GPa. • Able to return to original shape after deformation. • Tubular structure minimizes effects of defects. • Conduction independent of tube length.

  5. CNT Composites Properties • Capable of increasing polymers electrical conductivity by 8 times. • Increase polymers tensile strength by 50% and 40% stiffness with just 1 wt-% CNTs. • Interfacial shear of CNT/ polystyrene composite of about 160 MPa. • CNT/Cu composites have shown to have an electrical resistance half that of Cu.

  6. Applications • Power transmission cable. • Boiler walls. • Any other numerous applications that require high strength, light weight, high conductivity.

  7. Complications • CNTs tend to bundle together due to the surface tension of the surrounding fluid. • Excessive agitation can damage the CNTs. • Good CNT/matrix interface contact is essential. • Obtaining large sample of like CNTs. • CNTs cost approximately $500/gram.

  8. Processing Techniques • Sintering • Hot-press/hot-extrusion • Powder rolling • Many others to follow

  9. Future Work • Comprehensive studies to show how processing techniques, as well as processing variables, effect composite properties.

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