Enhancement of Mechanical Properties by Reinforcing Magnesium With Ni-Coated Carbon Nanotubes

2010 ◽  
Author(s):  
M. H. Nai ◽  
C. S. Goh ◽  
S. M. L. Nai ◽  
J. Wei ◽  
M. Gupta
Keyword(s):  
Carbon Nanotubes ◽  
Load Transfer ◽  
Matrix Material ◽  
Strength Based ◽  
The Matrix ◽  
Rapid Sintering ◽  
Reinforcing Material ◽  
Coated Carbon ◽  
Strength And Ductility ◽  
Walled Cnts

In this study, carbon nanotubes (CNTs) are coated with nickel (Ni) to improve the wettability of the CNT surface and metal matrix, and allow an effective load transfer from the matrix to nanotubes. Pure magnesium is used as the matrix material and different weight percentages of Ni-coated multi-walled CNTs are incorporated as the reinforcing material. The nanocomposite materials are synthesized using the powder metallurgy route followed by microwave assisted rapid sintering. Mechanical property characterizations reveal an improvement of 0.2% yield strength, ultimate tensile strength and ductility with the addition of Ni-CNTs. As such, Ni-coated CNTs can be used as a reinforcement in magnesium to improve the formability of the material for light-weight, strength-based applications.

SYNTHESIS AND CHARACTERIZATION OF CARBON NANOTUBES REINFORCED POLYMER NANOCOMPOSITES

2009 ◽  
Vol 08 (03) ◽  
pp. 237-242 ◽  
Author(s):  
MOHAMED A. ETMAN ◽  
R. M. RASHAD ◽  
M. K. BEDEWY
Keyword(s):  
Carbon Nanotubes ◽  
Matrix Material ◽  
Morphological Characterization ◽  
Experimental Program ◽  
Enhancement Effect ◽  
Reinforced Polymer ◽  
The Matrix ◽  
Matrix Nanocomposites ◽  
Strength And Ductility

An experimental program was designed to synthesize and characterize carbon nanotubes (CNTs) and CNTs reinforced polymeric matrix nanocomposites. PMMA, and PS, matrices were adopted for this investigation using different percents of CNTs loading of 0, 1, 3, and 5 and wt%. Morphological characterization was carried out using SEM, TEM, and TEDM microscopy. Mechanical properties were also measured to evaluate the enhancement effect of the CNTs loading percent. The results revealed a remarkable enhancement of the strength and ductility of the matrix material at 3 wt% of reasonably dispersed CNTs.

scholarly journals Particularities of structure formation of aluminum-copper composite materials manufactured by casting technology

2020 ◽  
pp. 116-121
Author(s):  
V. A. Kalinichenko ◽  
A. S. Kalinichenko ◽  
S. V. Grigoriev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Structure Formation ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Alloying Elements ◽  
Casting Technology ◽  
The Matrix ◽  
Reinforcing Material ◽  
Copper Composite

To create friction pairs operating in severe working conditions, composite materials are now increasingly used. Composite materials obtained with the use of casting technologies are of interest due to the possibility to manufacture wide range of compositions at low price compared to powder metallurgy. Despite the fact that many composite materials have been sufficiently studied, it is of interest to develop new areas of application and give them the properties required by the consumer. In the present work the composite materials on the basis of silumin reinforced with copper granules were considered. Attention was paid to the interaction between the matrix alloy and the reinforcing phase material as determining the properties of the composite material. The analysis of distribution of the basic alloying elements in volume of composite material and also in zones of the interphases interaction is carried out. The analysis of the possibility of obtaining a strong interphase zone of contact between the reinforcing component and the matrix material without significant dissolution of the reinforcing material is carried out.

Mechanical characterization of hexagonal boron nitride nanocomposites: A multiscale finite element prediction

2017 ◽  
Vol 52 (16) ◽  
pp. 2229-2241 ◽  
Author(s):  
Konstantinos N Spanos ◽  
Nick K Anifantis
Keyword(s):  
Finite Elements ◽  
Boron Nitride ◽  
Load Transfer ◽  
Hexagonal Boron Nitride ◽  
Matrix Material ◽  
The Matrix ◽  
Multiscale Finite Element ◽  
Two Phases ◽  
Good Agreement

In this study, a calculation of the elastic mechanical properties of composite materials reinforced by boron nitride nanosheets is taking place, following the finite elements approach. Composites are specifically composed of two phases of materials, the matrix material and the reinforcing phase, here, consisting of boron nitride monolayers. The simulation of these two materials as well as the interface between them were made in accordance with the micromechanics theory, examining a representative volume element. Specifically, the matrix material is considered as continuous medium and the reinforcing phase, based on its atomistic microstructure, is considered as a discrete medium and was simulated through spring-based finite elements. Something similar occurred with the simulation of the interface region, which is responsible for the load transfer between the two materials. The results of the method were compared with data from other studies and showed good agreement.

Physical, mechanical, thermal, and dynamic characterization of carbon nanotubes incorporated poly(methyl methacrylate)-based denture implant

2017 ◽  
Vol 51 (28) ◽  
pp. 3931-3940 ◽  
Author(s):  
Eraj Humayun Mirza ◽  
Aftab Ahmed Khan ◽  
Mohamad Ahmed El-Sharawy ◽  
Abdulaziz Al-Khureif ◽  
Saleh Al-Hijji ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Methyl Methacrylate ◽  
Load Transfer ◽  
Control Group ◽  
Denture Base ◽  
Poly Methyl Methacrylate ◽  
Thermal Changes ◽  
Transfer Capability ◽  
Base Polymer ◽  
Walled Cnts

The objective of this study was targeted to synthesize and characterize a carbon nanotubes (CNTs) incorporated poly(methyl methacrylate) (PMMA)-based denture polymer. Two experimental denture base polymers were fabricated either by incorporating single-walled CNTs (SWCNTs) (SW-group) or multi-walled CNTs (MWCNTs) (MW-group). In both groups, 0.5 wt% of the CNTs were incorporated into MMA monomer. Using a commercially available heat-cured PMMA (Interacryl Hot, Interdent, Opekarniska, Slovenia), a polymer-to-monomer ratio of 3:1 was used to fabricate the specimens (14 × 14 × 3 mm3 in dimensions) of the control group (without CNTs) (C-group) and the experimental groups (either SWCNT–PMMA or MWCNT–PMMA) ( n = 30, N = 90). Physical, mechanical, thermal, and rheological attributes of the tested materials were assessed. The data were statistically analyzed using SPSS version 21.0 (SPSS®, Chicago, IL, USA) and results were explored with one-way ANOVA. Incorporation of CNTs changed the surface morphology and topography of the PMMA specimens. No thermal changes were observed among C-, SW-, and MW-groups. Conversely, the hardness, elastic modulus and wear resistance were improved in both SW-group and MW-group. Additionally, the dynamic mechanical analyzer showed improvement in storage modulus in SW-group, affirming the load transfer capability of SW–PMMA composite. The CNT–PMMA composite might favorably be used as a potential denture base polymer.

scholarly journals Reinforcements of Petroleum Distillation Products with Carbon Nanotubes and Vapour Grown Carbon Fibres for the Development of Carbon Nanocomposites

2013 ◽  
Vol 22 (5) ◽  
pp. 096369351302200
Author(s):  
Parth Malik ◽  
Varun Katyal ◽  
Anil Kumar
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibre ◽  
Load Transfer ◽  
Bending Strength ◽  
Coal Tar ◽  
Matrix Resin ◽  
Neat Resin ◽  
Multiwalled Carbon ◽  
The Matrix ◽  
Two Phases

This study reports the synthesis of nanocomposites based on coal tar pitch, a carbon based material retrieved as residue during fractional distillation of petroleum reinforced by multiwalled carbon nanotubes (MWCNTs) and vapour grown carbon fibre (VGCF). With 10% wt. carbon nanotubes slight improvement in flexural strength and modulus is observed, while thermal conductivity increases marginally with 5% wt. carbon nanotubes. However significant improvement of more than 100% in bending strength is observed in vapour grown carbon fibre compounded pitch resin post graphitization at 10% wt. loading as compared to neat resin indicating better load transfer between two phases. Scanning electron micrograph shows that vapour grown carbon fibre are well dispersed in pitch matrix resin. However increasing filler content leads to agglomeration of fibres and voids in the matrix resin.

Effect of Hydroxyapatite Matrix on the Growth of Carbon Nanotubes via a CVD System

2011 ◽  
Vol 685 ◽  
pp. 335-339 ◽  
Author(s):  
Xiao Ying Lu ◽  
Bao Hua Wu ◽  
Yu Jie Liu ◽  
Tian Qiu ◽  
Jie Weng
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibers ◽  
Chemical Vapor ◽  
Weight Percent ◽  
The Matrix ◽  
Physical Mixing ◽  
Nano Size ◽  
Walled Cnts ◽  
Chemical Coprecipitation Method

This paper reports the fabrication of carbon nanotubes (CNTs) /hydroxyapatite (HA) composites via in-situ process in a chemical vapor deposition (CVD) system and the effect of HA matrix on the growth of CNTs. When the HA matrix is fabricated by a chemical coprecipitation method, deficient HA (D-HA) crystals in nano size have been observed in these composites. There are about 20% weight percent of multi-walled CNTs with a mean diameter of 40~60 nm. When the matrix used as catalyst for CNTs growth without HA in the same way, no CNTs but solid carbon fibers in submicrometer scale have been produced in these composites. Only Fe and MgO crystals can be observed in these composites. When the HA matrix is fabricated by a physical mixing with the presence of D-HA crystals, hollow CNTs with the diameter of 180~210 nm are also produced in these composites. Fe and MgO besides P2O5, D-HA and C crystals can be observed in the composites.

Mechanical and Morphological Studies of Al6061-Gr-SiC Hybrid Metal Matrix Composites

2015 ◽  
Vol 813-814 ◽  
pp. 195-202 ◽  
Author(s):  
T. Lokesh ◽  
U.S. Mallikarjun
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Morphological Studies ◽  
The Matrix ◽  
Strength And Ductility

Abstract. In recent years, Aluminium alloy based metal matrix composites (MMC) are gaining wide spread acceptance in several aerospace and automobile applications. These composites possess excellent wear resistance in addition to other superior mechanical properties such as strength, modulus and hardness when compared with conventional alloys. The hybrid composites are new generation of composites containing more than one type, shape or sizes of reinforcements giving superior combined properties of reinforcements and the matrix. In the present work, Al6061 has been used as matrix material and the reinforcing materials selected were SiC and Graphite particulates of 10 to 30µm size. Composites Al6061-Gr (2- 8 wt. %), Al6061-SiC (2 -10wt. %) and Hybrid composites with Al6061 matrix alloy containing 3wt% graphite and varying composition of 2-10wt% SiCp were prepared by stir casting technique. The cast matrix alloy and its composites have been subjected to solutionizing treatment at a temperature of 530 ± 20C for 6 hours, followed by ageing at a temperature of 175 ± 20C for 6 hours. The mechanical properties of as cast and T6 heat treated composites have been evaluated as per ASTM standards and compared. Addition of Graphite particulates into the Al6061 matrix improved the strength and ductility of the composites. Significant improvement in tensile strength and hardness was noticed as the wt. % of SiCp increases in Al6061-SiC composites. Addition of Graphite into Al6061-SiC further improved the strength and ductility of hybrid composites. The heat treatment process had the profound effect in improving the mechanical properties of the studied composites. The microstructural studies revealed the uniform distribution of SiC and Gr particles in the matrix system.

scholarly journals Green Sound-Absorbing Composite Materials of Various Structure and Profiling

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 407
Author(s):  
Eulalia Gliscinska ◽  
Javier Perez de Amezaga ◽  
Marina Michalak ◽  
Izabella Krucinska
Keyword(s):  
Sound Wave ◽  
Sound Absorption ◽  
Raw Materials ◽  
Matrix Material ◽  
Composite Layer ◽  
Renewable Raw Materials ◽  
Flax Fibers ◽  
The Matrix ◽  
Reinforcing Material ◽  
Positive Effect

This article presents thermoplastic sound-absorbing composites manufactured on the basis of renewable raw materials. Both the reinforcing material and the matrix material were biodegradable and used in the form of fibers. In order to mix flax fibers with polylactide fibers, the fleece was fabricated with a mechanical system and then needle-punched. The sound absorption of composites obtained from a multilayer structure of nonwovens pressed at different conditions was investigated. The sound absorption coefficient in the frequency ranging from 500 Hz to 6400 Hz was determined using a Kundt tube. The tests were performed for flat composites with various structures, profiled composites, and composite/pre-pressed nonwoven systems. Profiling the composite plate by convexity/concavity has a positive effect on its sound absorption. It is also important to arrange the plate with the appropriate structure for the incident sound wave. For the composite layer with an added pre-pressed nonwoven layer, a greater increase in sound absorption occurs for the system when a rigid composite layer is located on the side of the incident sound wave. The addition of successive nonwoven layers not only increases the absorption but also extends the maximum absorption range from the highest frequencies towards the lower frequencies.

scholarly journals Advantages of the Surface Structuration of the KBr Materials for the Spectrometry and Sensors

2018 ◽  
Author(s):  
Natalia Kamanina ◽  
Svetlana Likhomanova ◽  
Pavel Kuzhakov
Keyword(s):  
Carbon Nanotubes ◽  
Refractive Index ◽  
Matrix Material ◽  
Small Diameter ◽  
Main Idea ◽  
Potassium Bromide ◽  
Material Surface ◽  
Vertical Position ◽  
Output Window ◽  
The Matrix

A potassium bromide KBr material, which has been widely used as the key element in the Fourier spectrometers and as the output window of the IR-lasers, has been studied with good advantage via applying the carbon nanotubes in order to modify the potassium bromide surface. The laser oriented deposition method has been used to place the carbon nanotubes at the matrix material surface in the vertical position at the different electric field varied from 100 to 600 V×cm-1. The main idea of the improvement of the spectral properties of the potassium bromide structure is connected with the fact that the refractive index of the carbon nanotubes is substantially less than the refractive index of the studied material, and the small diameter of the carbon nanotubes allows one to embed these nano-objects in the voids of the lattice of the model matrix systems. Moreover, the mechanical characteristics and wetting features of the potassium bromide structures have been investigated under the condition mentioned above. Analytical and quantum-chemical simulations have supported the experimental results.

Growth of Carbon Nanotubes in Calcium Phosphate Matrix with Different Ca/P Molar Ratio

2011 ◽  
Vol 688 ◽  
pp. 141-147 ◽  
Author(s):  
Xiao Ying Lu ◽  
Tian Qiu ◽  
Jie Yu Liu ◽  
Bao Hua Wu ◽  
Jie Weng
Keyword(s):  
Carbon Nanotubes ◽  
Calcium Phosphate ◽  
Vapor Deposition ◽  
Crystal Size ◽  
Chemical Vapor ◽  
Molar Ratio ◽  
Tube Length ◽  
Wall Surface ◽  
The Matrix ◽  
Walled Cnts

This paper reports that carbon nanotubes (CNTs) can be successfully grown from calcium phosphate matrix without additional catalysis of transition metal by chemical vapor deposition (CVD) using acetylene as carbon source. There is a great difference in the CNT growth from the matrix prepared with the different initial Ca/P molar ratio. The matrix prepared with lower initial Ca/P molar ratio is favorable for the growth of CNTs. A number of multi-walled CNTs with the diameter of 25~40 nm and 15~25 nm can be produced from the matrix with initial Ca/P molar ratio of 1.5 and 1.625, respectively, while no CNTs can be grown from the matrix with initial Ca/P molar ratio of 1.67. Tricalcium phosphate and hydroxyapatite crystallites with crystal size smaller than 50 nm besides carbon crystals are found in the as-obtained powders prepared with initial Ca/P molar ratio of 1.5 and 1.625. Compared with the growth of CNTs produced from all the matrixes, it is found that the CNTs grown from this matrix with Ca/P molar ratio of 1.5 have the longest tube length, cleanest and smoothest wall surface, and the content of CNTs is highest.

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