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 15.07.2011   Карта сайта     Language По-русски По-английски
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15.07.2011




Ceramics International
Volume 37, Issue 7, September 2011, Pages 2151-2157





Synthesis and properties of ceramic-based nanocomposite layer of aluminum carbide embedded with oriented carbon nanotubes


M. Aliofkhazraeia, Corresponding Author Contact Information, E-mail The Corresponding Author, E-mail The Corresponding Author, Mohammad Yousefib, Sh. Ahangaranic and A. Sabour Rouhaghdama, Corresponding Author Contact Information, E-mail The Corresponding Author, E-mail The Corresponding Author





a Department of Materials Science, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran, P.O.Box: 14115-143


b X-ray laboratory, Faculty of Science, Tarbiat Modares University, Tehran, Iran, Posatal code: 1411713116


c Department of Advanced Materials and Renewable Energies, Iranian Research Organization for Science and Technology (IROST), P.O. Box 15815-3538, Tehran, Iran




Received 14 December 2010;


revised 30 January 2011;


accepted 1 March 2011.


Available online 8 April 2011.












Abstract



In the present work, carbon nanotubes (CNTs) were embedded in aluminum carbide coating in desired vertical/horizontal direction in order to fabricate a nanocomposite layer with unidirectional enhanced mechanical properties. A novel method based on monopolar pulsed plasma electrolysis under magnetic field was used for this purpose. Nanostructure of the obtained nanocomposite layer was examined with high precision figure analysis of SEM, AFM and TEM nanostructures. The mechanical and tribological properties of these coatings were investigated with respect to the direction of the embedded CNTs. The coefficient of friction was lowered from 0.2 to less than 0.1 in a pin-on-disc test against steel with dramatic affected coating wear rate by a decrease to near 400% with respect to raw substrate. The lower friction is attributed to more extensive creation of amorphous carbon on the counter surface and also in the coating wear track. As a conclusion, this method is appropriate for fabrication of hard coating on the surface of low-melting-point metals and light alloys.





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