ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Carbon nanotubes (CNTs) have been the subject of intensive study for applications in thefields of nanotechnologies in recent years due to their superior mechanical, electric, optical andelectronic properties. Because of their exceptionally small diameters (≈ several nm) as well as theirhigh Young’s modulus (≈ 1 TPa), tensile strength (≈ 200 GPa) and high elongation (10-30%) inaddition to a high chemical stability, CNTs are attractive reinforcement materials for light weightand high strength metal matrix composites. In this study, bottom-up type powder processing andtop-down type SPD (severe plastic deformation) approaches were combined in order to achieve fulldensity of CNT/metal matrix composites with superior mechanical properties by improved particlebonding and least grain growth, which were considered as a bottle neck of the bottom-up methodusing the conventional powder metallurgy of compaction and sintering. ECAP (equal channelangular pressing), the most promising method in SPD, was used for the CNT/Cu powderconsolidation. The powder ECAP processing with 1, 2, 4 and 8 route C passes was conducted atroom temperature. It was found by mechanical testing of the consolidated CNT/Cu that highmechanical strength could be achieved effectively as a result of the Cu matrix strengthening andimproved particle bonding during ECAP. The ECAP processing of powders is a viable method toachieve fully density CNT-Cu nanocomposites
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.245.pdf
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