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Effect of MWCNTs content on the characteristics of A356 nanocomposite

Rashad R. M., Awadallah O.M., Wifi A. S.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 58, nr 2

74--80

Purpose: The objective of the present paper is to study the effect of Multiwalled Carbon Nanotubes (MWCNTs) content on the mechanical properties of the A356 hypoeutectic aluminum- silicon based nanocomposite. Design/methodology/approach: The semi-solid route stir casting technique is used for composite processing. MWCNTs and Aluminum powder are premixed by ball milling and green compacted to form small billets. Al-MWCNTs billets are added to the melt and incorporated by vigorous mechanical stirring. The mechanical and metallurgical properties of the produced composite are characterized by, scanning electron microscopy (SEM), optical microscopy, and tensile testing DIN 50125. Findings: MWCNTs are successfully incorporated into the A356 melt up to 1.5 % weight fraction. SEM analysis revealed a uniform dispersion of MWCNTs with good interfacial bonding between the matrix and the MWCNTs. The ultimate tensile strength and elongation of the produced composite are increased by 34% and 250% respectively compared to their corresponding values of monolithic alloy. Research limitations/implications: The research was carried out based on MWCNTs only with a range of percentage additions; it could be extended to single Walled CNTs and graphene sheets with different percentage additions. Stirring time and speed as well as heat treatment can also be applied as further study. Practical implications: This work helps in introducing novel technique in dispersing Nano particulates in metal matrix composites. This could be good potential for new developed composites. Originality/value: A novel approach for MWCNTs reinforcement addition technique is implemented. This technique results in a uniform dispersion of MWCNTs with good interfacial bonding between the matrix and the MWCNTs.

Advanced Nanometrology Techniques of Carbon Nanotubes Characterization

Ali S. H. R., Etman M. A., Azzam B. S., Rashad R. M., Bedewy M. K.

Metrology and Measurement Systems

2008

Vol. 15, nr 4

551-561

It has become evident that carbon nanotubes (CNTs) possess exceptionally high physical, mechanical, electrical, and structural properties that made them attractive for researchers to investigate. In this paper, CNTs synthesized by submerged DC arc in deionized water were subjected to six different characterization techniques in order to have an insight into their intrinsic properties. Stages of CNTs growth scenario during their synthesis were captured by Transmission Electron Microscopy (TEM). Images of Scanning Tunneling Microscopy (STM) depicted the spaghetti-like nature of nanotubes sized in the range from 6 to 8 nm diameters with bends and kinks observed. Transmission Electron Diffraction Microscopy (TEDM) images declared the purity of the synthesized CNTs. Also, Fourier Transformation Infra Red (FTIR) spectrum analysis depicted the transmittance and frequency band widths of peaks relevant to the functional groups. In addition, Raman spectrum analysis disclosed the G and D modes with no radial breathing mode (RBM) for a random sample of the synthesized CNTs indicating some defects, strain, oxidation stated of the SWCNTs with the possibility of multiwalled carbon nanotubes existence as well. Thermo Gravimetric Analysis (TGA) reflected the thermal stability of the synthesized CNTs as they sustained temperatures approaching almost 1000°C. Thus, it can be concluded that the used techniques proved to successfully characterize the synthesized CNTs, so that they can be reasonably nominated for suitable potential application.