scholarly journals Uniform Dispersion of Multiwalled Carbon Nanotubes in Copper Matrix Nanocomposites Using Metal Injection Molding Technique

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Ali Samer Muhsan ◽  
Faiz Ahmad ◽  
Norani M. Mohamed ◽  
Puteri Sri Melor Megat Yusoff ◽  
Muhammad Rafi Raza
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
Multiwalled Carbon Nanotubes ◽  
Elevated Temperatures ◽  
Metal Injection Molding ◽  
Ni Catalyst ◽  
Multiwalled Carbon ◽  
Uniform Dispersion ◽  
Pure Cu ◽  
Matrix Nanocomposites

This work presents a novel fabrication approach of multiwalled carbon nanotubes (MWNTs) reinforced copper (Cu) matrix nanocomposites. A combination of nanoscale dispersion of functionalized MWNTs in low viscose media of dissolved paraffin wax under sonication treatment followed by metal injection molding (MIM) technique was adopted. MWNTs contents were varied from 0 to 10 vol.%. Information about the degree of purification and functionalization processes, evidences on the existence of the functional groups, effect of sonication time on the treated MWNTs, and microstructural analysis of the fabricated Cu/MWNTs nanocomposites were determined using TEM, EDX, FESEM, and Raman spectroscopy analysis. The results showed that the impurities of the pristine MWNTs such as Fe, Ni catalyst, and the amorphous carbon have been significantly removed after purification process. Meanwhile, FESEM and TEM observations showed high stability of MWNTs at elevated temperatures and uniform dispersion of MWNTs in Cu matrix at different volume fractions and sintering temperatures (950, 1000 & 1050°C). The experimentally measured thermal conductivities of Cu/MWNTs nanocomposites showed remarkable increase (11.25% higher than sintered pure Cu) with addition of 1 vol.% MWNTs, and slight decrease below the value of sintered Cu at 5 and 10 vol.% MWNTs.

scholarly journals Effect of Increasing the Strength of Aluminum Matrix Nanocomposites Reinforced with Microadditions of Multiwalled Carbon Nanotubes Coated with TiC Nanoparticles

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1596 ◽  
Author(s):  
Artemiy Aborkin ◽  
Kirill Khorkov ◽  
Evgeny Prusov ◽  
Anatoly Ob’edkov ◽  
Kirill Kremlev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Aluminum Matrix ◽  
High Energy ◽  
High Tech ◽  
Multiwalled Carbon ◽  
The Matrix ◽  
Tic Nanoparticles ◽  
Matrix Nanocomposites

Aluminum matrix composites reinforced with multiwalled carbon nanotubes (MWCNTs) are promising materials for applications in various high-tech industries. Control over the processes of interfacial interaction in Al/MWCNT composites is important to achieve a high level of mechanical properties. The present study describes the effects of coating MWCNTs with titanium carbide nanoparticles on the formation of mechanical properties and the evolution of the reinforcement structure in bulk aluminum matrix nanocomposites with low concentrations of MWCNTs under conditions of solid-phase consolidation of ball-milled powder mixtures. Using high-energy ball milling and uniaxial hot pressing, two types of bulk nanocomposites based on aluminum alloy AA5049 that were reinforced with microadditions of MWCNTs and MWCNTs coated with TiC nanoparticles were successfully produced. The microstructural and mechanical properties of the Al/MWCNT composites were investigated. The results showed that, on the one hand, the TiC nanoparticles on the surface of the MWCNT hybrid reinforcement reduced the damage of reinforcement under the intense exposure of milling bodies, and on the other hand, they reduced the contact area of the MWCNTs with the matrix material (acting as a barrier interface), which also locally inhibited the reaction between the matrix and the MWCNTs.

Carbon Nanotubes Reinforced Copper Matrix Nanocomposites via Metal Injection Molding Technique

2012 ◽  
Vol 12 (23) ◽  
pp. 2397-2403 ◽  
Author(s):  
Ali S. Muhsan ◽  
Faiz Ahmad ◽  
Norani M. Mohamed ◽  
Putri S.M.BT M. Yusoff ◽  
M.R. Raza
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
Copper Matrix ◽  
Metal Injection Molding ◽  
Matrix Nanocomposites

Fabrication and Microstructural Analysis of CNTs Reinforced Copper Matrix Nanocomposites via MIM Technique

2013 ◽  
Vol 459 ◽  
pp. 11-17 ◽  
Author(s):  
Ali Samer Muhsan ◽  
Faiz Ahmad ◽  
Norani M. Mohamed ◽  
Muhammad Rafi Raza Malik
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
Microstructural Analysis ◽  
Copper Matrix ◽  
Metal Injection Molding ◽  
Solid Loading ◽  
Twin Screw ◽  
Viscous Media ◽  
Screw Rotor ◽  
Matrix Nanocomposites

Carbon nanotubes (CNTs) reinforced copper (Cu) matrix nanocomposites prepared via advanced fabrication method is presented. Functionalization and ultrasonication processes have been applied to enhance the dispersion of purified CNTs and creates sidewalls groups that have the potential to bond CNTs to the metal matrix. The main part of this approach was metal injection molding (MIM) technique, which is a combination of powder metallurgy and plastic injection molding technique. Preparation of MIM feedstock required a melting and mixing process of binder system (polymers) with the solid loading, which has been carried out using a twin screw rotor machine. This machine provides a viscous media of the molten binder with high shear forces that allow the additives (carbon nanotubes/copper powder) to be mixed properly and exfoliate the CNTs clusters with uniformdispersion inside the Cu matrix. Subsequently, to prove our expected results, observation tests of TEM, SEM, FESEM and CNTS were employed and discussed literally.

Tribological, Mechanical, and Microstructural of Multiwalled Carbon Nanotubes/Short Carbon Fiber Epoxy Composites

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
O. J. Gbadeyan ◽  
Krishnan Kanny ◽  
Mohan Turup Pandurangan
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Wear Rate ◽  
Multiwalled Carbon Nanotubes ◽  
High Heat ◽  
Structural Development ◽  
Multiwalled Carbon ◽  
Short Carbon Fiber ◽  
Uniform Dispersion ◽  
Short Carbon

In the present work, composites were developed with novel combination of particular fillers and fibers for an automotive brake system. The influence of short carbon fiber (SCF) on wear rate, coefficient of friction (CoF), modulus, compressive strength, hardness, and surface morphology of worn surface were examined. This investigation confirmed that 0.1% multiwalled carbon nanotubes (MWCNTs) reduced wear rate, CoF for all combinations of composite with carbon fiber. Results indicate that 0.1% (MWCNTs) and 10% SCF-filled composite had superior properties. This performance may be attributed to the uniform dispersion of fiber and the synergistic effect of SCF and MWCNTs, acting in concert that formed a more stable structure resulting in a high strength, stiffness, tougher, and high-heat absorption. Scanning electron microscopy (SEM) microstructure subsequently performed show change in structural development with a corresponding increase of the incorporation of SCF and MWCNTs, which eventually explained the improved properties of composite.

Synergy effects of graphene and multiwalled carbon nanotubes hybrid system on properties of epoxy nanocomposites

2017 ◽  
Vol 36 (9) ◽  
pp. 685-695 ◽  
Author(s):  
ZA Ghaleb ◽  
M Mariatti ◽  
ZM Ariff
Keyword(s):  
Thin Film ◽  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Electrical Percolation ◽  
Uniform Dispersion ◽  
Synergy Effects ◽  
Electrical Percolation Threshold ◽  
Film Nanocomposites

Tensile and electrical properties of graphene nanopowder (GNP) and multiwalled carbon nanotubes (MWCNT) filled epoxy thin film nanocomposites were investigated. In addition, synergy effects of various mixture ratios of GNP–MWCNT hybrids on the properties of the epoxy thin film nanocomposites were evaluated. It was found that the addition of GNPs or MWCNTs decreased the tensile properties compared to that of unfilled epoxy. The electrical percolation threshold of MWCNT/epoxy was found to be 0.8 vol%. Addition of only 0.1 vol% GNPs results in significant improvement in the electrical properties of the composites. Enhanced tensile and electrical properties in the GNP–MWCNT/epoxy hybrid were achieved with GNP–MWCNT ratio of 0.1:0.4. Morphological analysis confirmed the uniform dispersion of both GNPs and MWCNTs within the epoxy matrix. For the hybrid GNP–MWCNT filler system (i.e., with the 0.1:0.4 ratio), MWCNTs were seen to align themselves on the GNPs surfaces creating an interconnected strong nanofiller network in the epoxy.

scholarly journals Characterization and Hydrogen Storage of Surface-Modified Multiwalled Carbon Nanotubes for Fuel Cell Application

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Kuen-Song Lin ◽  
Yao-Jen Mai ◽  
Shin-Rung Li ◽  
Chia-Wei Shu ◽  
Chieh-Hung Wang
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Storage Capacity ◽  
Early Stage ◽  
Bond Distance ◽  
Pd Nanoparticles ◽  
Synthesis Process ◽  
Ni Catalyst ◽  
Multiwalled Carbon ◽  
Solvothermal Route

The synthesis, identification, and H2storage of multiwalled carbon nanotubes (MWCNTs) have been investigated in the present work. MWCNTs were produced from the catalytic-assembly solvent (benzene)-thermal (solvothermal) route. Reduction of C6Cl6with metallic potassium was carried out in the presence of Co/Ni catalyst precursors at 503–623 K for 12 h. XRD patterns indicated that the abstraction of Cl from hexachlorobenzene and the formation of KCl precipitates were involved in the early stage of the synthesis process of MWCNTs. This result offers further explanation for the formation of MWCNT structure and yield using the solvothermal route depending on the Co/Ni catalyst precursors. The diameter of MWCNTs ranged between 30 and 100 nm and the H2storage capacity of MWCNTs improved when 2.7–3.8 wt% Pd or NaAlH4were doped. The XANES/EXAFS spectra revealed that the Co/Ni catalyst precursors of the MWCNT synthesis were in metallic form and Pd atoms possessed a Pd–Pd bond distance of 2.78 Å with a coordination number of 9.08. Ti-NaAlH4or Pd nanoparticles were dispersed on MWCNTs and facilitated to improve the H2storage capacity significantly with the surface modification process.

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