Nickel coated carbon nanotubes in aluminum matrix composites: a multiscale simulation study (original) (raw)
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Carbon Nanotube Evolution in Aluminum Matrix during Composite Fabrication Process
Materials Science Forum, 2011
In this study, carbon nanotube (CNT) reinforced aluminum (Al) composite was fabricated by powder metallurgy (P/M) technique and the evolution of CNTs within the matrix were traced, characterized and discussed. It was found that the separation of CNTs was affected by both the powder mixing operation as well as the secondary processing. CNTs were damaged during mechanical powder mixing and sintering process, whilst the graphitic structures were not damaged during the secondary processing. In addition, CNTs were subjected to substantial compression stress in both powder mixing and sintering process.
Optimization of analytical modelling of aluminum-multiwall carbon nanotube composites
Materials Today: Proceedings, 2019
A tale aluminum metallic framework composite invigorated with SiC debris were set up through liquid metallurgy course. Continuous progressions in composites are not clearly primarily based on the improvement of mechanical houses, but also on machinability for difficult to device shapes. Electrical release machining (EDM) was used to machine MMC with copper anode. The use of EDM. Displaying and development of non-traditional machining is as but a non-stop place of Research. The goal of this work is to improve Electrical Discharge Machining manner parameters of Aluminum-multiwall carbon Nano-tube composites (AL-CNT) model. Material Removal Rate (MRR), Wear Electrode Ratio (EWR) and Average Surface Roughness (Ra) are critical locations. The Machining parameters are machiningon time table (sec), release current (A), voltage (V), absolute profundity of reduce (mm), and %wt. CNT included. Numerical fashions for all reactions as capacity of significant method parameters are created the usage of Response Surface Methodology (RSM). Test effects show best degrees for cloth expulsion fee are %wt. CNT (zero%), unusual u.S.A. Of the use of release current (6 A) and low degree of voltage (50 V) while ideal tiers for Electrode located on percentage are %wt. CNT (five%), fantastic u.S. Of launch current-day (6 A) and fantastic levels for everyday ground unpleasantness are %wt. CNT (0%), low diploma of release cutting-edge-day (2 A) and odd us of a profundity of lessen (1 mm). Their scattering within the aluminum grid have end up done with the aid of the use of ultrasonic/methanol approach pursued with the aid of the usage of immoderate-power mechanical processing system. The impact of Multi-Wall Carbon Nanotube Composites (MWCNTs) on the morphology and mechanical conduct of composites were assessed. Results exhibit that a homogeneous scattering of CNTs modified into gotten as an very last effects of the scattering guides carried out in the creation of composites, looking no harm on their morphology. The mechanical behavior of the composites demonstrates a recognizable development for MWCNTs focuses above 2.0 wt%, with flexibility like that found inside the writing for the Al7075 organisation compound.
Mechanical characterization of copper coated carbon nanotubes reinforced aluminum matrix composites
Materials Characterization, 2013
In this investigation, carbon nanotube (CNT) reinforced aluminum composites were prepared by the molecular-level mixing process using copper coated CNTs. The mixing of CNTs was accomplished by ultrasonic mixing and ball milling. Electroless Cu-coated CNTs were used to enhance the interfacial bonding between CNTs and aluminum. Scanning electron microscope analysis revealed the homogenous dispersion of Cu-coated CNTs in the composite samples compared with the uncoated CNTs. The samples were pressureless sintered under vacuum followed by hot rolling to promote the uniform microstructure and dispersion of CNTs. In 1.0 wt.% uncoated and Cu-coated CNT/Al composites, compared to pure Al, the microhardness increased by 44% and 103%, respectively. As compared to the pure Al, for 1.0 wt.% uncoated CNT/Al composite, increase in yield strength and ultimate tensile strength was estimated about 58% and 62%, respectively. However, in case of 1.0 wt.% Cu-coated CNT/Al composite, yield strength and ultimate tensile strength were increased significantly about 121% and 107%, respectively.
Ceramics International, 2020
Using a metalorganic chemical vapor deposition (MOCVD) technique and a tungsten hexacarbonyl W(CO) 6 as a precursor, a stable and continuous coating consisting of nonstoichiometric WC 1-x nanoparticles with sizes from 10 to 30 nm on the surface of multi-walled carbon nanotubes (CNTs) was obtained. The resulting hybrid WC 1-x / CNTs structures had a developed surface morphology, which contributed to a more complete realization of the potential of the physical and mechanical properties of CNTs when used as reinforcement in composite materials. Comparative assessment of aluminum matrix nanocomposites AA5049 + 5 wt% CNTs and AA5049 + 5 wt% WC 1-x /CNTs obtained by high energy ball milling and subsequent hot consolidation at 450°С shows that the WC 1-x ceramic coating on the carbon nanotubes surface acts as a barrier layer at the interface, preventing the Al 4 C 3 in situ formation at the matrix/CNT boundary. Coating of carbon nanotubes with WC 1-x nanoparticles leads to a significant increase in the physical and mechanical properties of aluminum matrix nanocomposites, in particular, to an increase in the compressive strength from 810 ± 8 MPa to 893 ± 7 MPa, fracture deformation from 3.7% to 4.9%, Young's modulus from 102 ± 6 GPa to 110 ± 4 GPa, and microhardness from 152 ± 6 HV to 176 ± 8 HV in comparison with using of CNTs in the as-synthesized state.
International Journal of Scientific Research in Science and Technology, 2020
Various metal matrix composites (MMCs) are widely used in the automotive, aerospace and electrical industries due to their capability and flexibility in improving the mechanical, thermal and electrical properties of a component. However, current manufacturing technologies may suffer from insufficient process stability, reliability and inadequate economic efficiency and may not be able to satisfy the increasing demands placed on MMCs. So CNT based Aluminium based metal matrix composites (MMCs) has been a better choice for the industrial applications due to their Inherent properties like ductile, highly conductive, lightweight and have a high strength to weight ratio. In this study, Multiwall carbon nanotube(MWCNT) which is emerged as a excellent reinforcement material and 2024 aluminium alloy being a matrix material were selected for the development of MMC’s. Stir casting process being a low cost casting technology which has potential to produce MMCs having agility to large scale production with great manufacturing flexibility, quality and high efficiency. In this work, The experimental investigation of CNT reinforced 2024 Aluminium MMCs under Stir casting technique were explored. Casted samples were prepared with different wt % of reinforcements(i.e., 0.5 %, 1.0%, 1.5% & 2 % CNT’s with 40micron nickel coating on the surface using electro-less plating process) and compared with unreinforced aluminium specimens for the investigation of mechanical properties such as Tensile, Compressive, and Hardness has been evaluated as per ASTM standard.