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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus

12 Issues per year


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

Online
ISSN
1865-7109
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Volume 71, Issue 2

Issues

Investigation of Thermal Expansion and Physical Properties of Carbon Nanotube Reinforced Nanocrystalline Aluminum Nanocomposite

Manjula Sharma
  • National Institute of Technology Hamirpur, Department of Physics, Himachal Pradesh 177005, India
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Vimal SharmaORCID iD: http://orcid.org/0000-0001-5536-6630
Published Online: 2015-12-23 | DOI: https://doi.org/10.1515/zna-2015-0296

Abstract

Carbon nanotube (CNT) reinforced nanocrystalline aluminum matrix composites are fabricated by a simple and effective physical mixing method with sonication. In this study, the microstructural characterisations and property evaluations of the nanocomposites were performed. The structural characterisations revealed that CNTs were dispersed, embedded, and anchored within the metal matrix. A strong interfacial adhesion appeared between CNTs and nanocrystalline aluminum as a result of the fabrication process. Raman and Fourier transform infrared spectroscopic studies also confirmed the surface adherence of CNTs with nanocrystalline aluminum matrix during the fabrication process. Thermal expansion behaviour of CNT-reinforced aluminum matrix composites was investigated up to 240°C using a dilatometer. The coefficient of thermal expansion of the nanocomposites decreased continuously with the increasing content of CNTs. The maximum reduction of 82% was found for 4 wt% CNTs in the nanocomposite. The coefficient of thermal expansion variation with CNTs was also compared with the predictions from the thermoelastic models. The expansion behaviour of the nanocomposites was correlated to the microstructure, internal stresses, and phase segregations. The electrical and thermal conductivity was also studied and was observed to decrease for all reinforced CNT weight fractions.

Keywords: Carbon Nanotubes; Electrical and Thermal Conductivity; Electron Microscopy; Thermal Expansion; X-ray Diffraction

References

About the article

Corresponding author: Vimal Sharma, National Institute of Technology Hamirpur, Department of Physics, Himachal Pradesh 177005, India, Phone: +91 9459275085, E-mail: .


Received: 2015-06-29

Accepted: 2015-11-27

Published Online: 2015-12-23

Published in Print: 2016-02-01


Citation Information: Zeitschrift für Naturforschung A, Volume 71, Issue 2, Pages 165–174, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-2015-0296.

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