| Summary: | Metal matrix composites are grabbing more attention by researchers due to their outstanding properties which
meets the requirements of a specific application. The work presented in the current paper investigates the influence
of size of carbon nanotube in Al-CNT metal matrix composite. The metal matrix composites were fabricated using
powder metallurgy process. The influence of size (Type1, Type2 and Type3) and content (0.5, 1.0 and 1.5wt %) of
multi walled carbon nanotube in matrix on thermal properties (CTE) were experimentally investigated. Scanning
Electron Microscope (SEM) was used to observe the microstructure of fabricated metal matrix and to examine the
uniform dispersion of CNT without any agglomerations in the matrix and was found to be satisfactory. The results
of thermal test showed that if the CNT particle content increases considerably the Coefficient of thermal expansion
decreases markedly upon the increase in CNT content and Type 1 Al-CNT matrix shows a maximum decrement of
15.36% in CTE when compared to Type 2 and Type 3 Al-CNT matrix.
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