Study The Properties of Sintered Al-Composites Matrix Reinforced With Nano-Al Oxide And/Or Carbon Nano Tubes

2018 ◽  
Vol 14 (3) ◽  
pp. 5741-5752
Author(s):  
A. E. Hammad ◽  
M. Amin ◽  
M. Ragab ◽  
Yasser M. R. AboelMagd
Keyword(s):  
Hybrid Composites ◽  
Wear Loss ◽  
Aluminum Bronze ◽  
Hardness Tests ◽  
The Matrix ◽  
Carbon Nano Tubes ◽  
Oxide Particles ◽  
The Impact ◽  
Bronze Matrix

The present work is concerned with studying the synthesis and characterization of hybrid aluminum bronze matrix strengthened with nano-aluminum oxide particles (n-Al2O3), and carbon nano tubes (CNTs). The selected matrix composite was successfully incorporated with different weighted percentages of CNTs (i.e. 1.0 and 2.0 wt.%) and/or n-Al2O3 (i.e. 1.0 and 2.0 wt.%) by sintering process. From the microstructure analysis, n- Al2O3 particles was dispersed uniformly and holding over the surface of aluminum bronze. Furthermore, some agglomeration was found due to reinforced CNTs into aluminum bronze matrix. From hardness tests, it was found that incorporated n- Al2O3 and CNTs into matrix increased the hardness of composites to be equal 230 HV, which is around 2.3 times higher than that of an aluminum bronze matrix. Moreover, the wear loss of CNTs - Al2O3/aluminum bronze composites diminished because of the impact of homogeneous circulation of CNTs in aluminum bronze and low corrosion coef?cient of uncovered CNTs on the well-used surface. Notable from the results, the electrical resistivity of the hybrid composites are lower than the matrix. Hopefully, the findings are expected to provide profound knowledge and further reference towards the studied composites of the miniaturised electronic package

Mechanical characterization of eggshell ash and boron carbide reinforced ZA-27 hybrid metal matrix composites

2021 ◽  
pp. 095440622110200
Author(s):  
Pawandeep Singh ◽  
RK Mishra ◽  
Balbir Singh
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Impact Strength ◽  
Boron Carbide ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Base Alloy ◽  
The Matrix ◽  
The Impact

This study aimed at discovering the influence of low-cost eggshell ash (ESA) and boron carbide (B4C) addition on microstructure and mechanical characteristics of ZA-27 hybrid composites. Six different composites were fabricated utilizing the stir casting technique with different weight percentages of ESA and B4C particles varied from 0-5 wt.%. Composites were tested for density, hardness, compressive strength, tensile strength, and impact strength. X-ray diffraction (XRD) and scanning electron microscope (SEM) were utilized for the characterization of composites. Microstructure examination using SEM exhibited homogeneously dispersed reinforcements in the matrix. ESA particles decreased the composite density by 3.12%, and after the addition of B4C particles, density was found to be increased but was still lower than the base ZA-27 alloy. The hardness, tensile and compressive strength of the composites increased with the addition of reinforcements. However, composite reinforced with maximum wt.% of B4C particles showed a decreasing trend. The impact strength of the composites decreased when compared with the base alloy, but the reduction was marginal. Improved hardness, tensile and compressive strength of the composites was attributed to homogeneously dispersed ESA and B4C particles in the matrix. Higher tensile strength resulted from strong interfacial bonding between reinforcements and metal matrix, and low impact strength was due to brittle failure and plastic deformation.

scholarly journals Reliability Assessment of a Multi-State HVDC System by Combining Markov and Matrix-Based Methods

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3097
Author(s):  
Roberto Benato ◽  
Antonio Chiarelli ◽  
Sebastian Dambone Sessa
Keyword(s):  
Current System ◽  
Estimation Method ◽  
Reliability Estimation ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Hvdc System ◽  
Critical Elements ◽  
The Matrix ◽  
The Impact

The purpose of this paper is to highlight that, in order to assess the availability of different HVDC cable transmission systems, a more detailed characterization of the cable management significantly affects the availability estimation since the cable represents one of the most critical elements of such systems. The analyzed case study consists of a multi-terminal direct current system based on both line commutated converter and voltage source converter technologies in different configurations, whose availability is computed for different transmitted power capacities. For these analyses, the matrix-based reliability estimation method is exploited together with the Monte Carlo approach and the Markov state space one. This paper shows how reliability analysis requires a deep knowledge of the real installation conditions. The impact of these conditions on the reliability evaluation and the involved benefits are also presented.

Fabrication and Characterization of A356-Basalt Ash-Fly Ash Composites Processed by Stir Casting Method

2017 ◽  
Vol 25 (3) ◽  
pp. 209-214 ◽  
Author(s):  
G. Venkatachalam ◽  
A. Kumaravel
Keyword(s):  
Fly Ash ◽  
Impact Strength ◽  
Hybrid Composites ◽  
Cost Effective ◽  
Weight Fraction ◽  
Stir Casting ◽  
Matrix Composites ◽  
Casting Method ◽  
The Matrix

This paper presents the characterization of A356 composite reinforced with fly ash and basalt ash produced by stir casting method. Aluminium metal matrix composites (AMC) are used in wide variety of applications such as structural, aerospace, marine, automotive etc. Stir casting is cost effective manufacturing process and it is useful to enhance the attractive properties of AMCs. Three sets of hybrid AMC are prepared by varying the weight fraction of the reinforcements (3% basalt + 7% fly ash, 5% basalt + 5% fly, 7% basalt + 3% fly ash). The effect of reinforcements on the mechanical properties of the hybrid composites such as hardness, tensile, compressive and impact strength were studied. The obtained results reveal that tensile, compressive and impact strength was increased when weight fraction of fly ash increased, whereas the hardness increases when weight fraction of the basalt ash increased. Microscopic study reveals the dispersion of the reinforcements in the matrix.

scholarly journals Effect of addition of different reinforcements on the microstructure and mechanical characterization of the Al-Flyash composites

2021 ◽  
Vol 15 (56) ◽  
pp. 217-228
Author(s):  
Milind K. Wasekar ◽  
Mohan P. Khond
Keyword(s):  
Tensile Strength ◽  
Hybrid Composites ◽  
Tensile Tests ◽  
Stir Casting ◽  
Interface Bonding ◽  
Casting Technique ◽  
Testing Procedures ◽  
The Matrix ◽  
Aluminum 6061 Alloy

The aim of this work is to investigate the influence of the addition of silicon carbide and molybdenum disulfide on the microstructure and the tensile strength of the Al-Flyash hybrid composites prepared using the stir casting technique. The composite with aluminum 6061 alloy as the matrix and flyash as the reinforcement, with different weight fractions, is investigated to study its microstructure and the tensile strength. The same has been compared with the hybrid composites with Aluminum-Flyash/SiC and Aluminum-Flyash/MoS2 for different weight fractions of the reinforcements. The tensile tests were conducted as per ASTM standard testing procedures at room temperature. From the results it is identified that tensile strength of the Al6061-Flyash composite is lesser than the Al6061-Flyash/SiC and Al6061-Flyash/MoS2 hybrid composites. It is also observed that increment in the composition of the SiC and MoS2 causes the increment in the tensile strength of the hybrid composite. This increment in the tensile strength is due to good interface bonding and uniform distribution of the reinforcements in the composite.

Preparation and Characterization of Hybrid Aluminum Matrix Composites Reinforced with MWCNT Using Powder Metallurgy Process

2015 ◽  
Vol 813-814 ◽  
pp. 620-624
Author(s):  
S. Dhandapani ◽  
T. Rajmohan ◽  
K. Palanikumar ◽  
Charan Mugunthan
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Metal Matrix ◽  
Matrix Material ◽  
Aluminum Matrix ◽  
Nano Particles ◽  
Aluminum Matrix Composites ◽  
The Matrix ◽  
Carbon Nano Tubes

Metal Matrix Nano Composites (MMNC) consist of a metal matrix reinforced with nano-particles featuring physical and mechanical properties very different from those of the matrix. Especially carbon Nano tubes (CNT) can improve the matrix material in terms of wear resistance, damping properties and mechanical strength. The present investigation deals with the synthesis and characterization of aluminium matrix reinforced with micro B4C particles, and Multi Wall Carbon nano Tubes (MWCNT) were prepared by powder metallurgy route. Powder mixture containing fixed weight (%) of B4C and different wt% of MWCNT as reinforcement constituents that are uniaxial cold pressed and later green compacts are sintered in continues electric furnace. Microstructure and Mechanical properties such as micro hardness and density are examined. Micro structure of samples has been investigated using scanning electron microscope (SEM) .The results indicated that the increase in wt % of MWCNT improves the bonding and mechanical properties.

scholarly journals Synthesis and characterization of linear and crosslinked polymers with the addition of DMSPS

2019 ◽  
Vol 73 (1) ◽  
pp. 1
Author(s):  
Karolina Fila ◽  
Beata Podkościelna
Keyword(s):  
Spectroscopic Analysis ◽  
Bulk Polymerization ◽  
Synthesis And Characterization ◽  
Scanning Calorimetry ◽  
Chemical Structures ◽  
Hardness Tests ◽  
Ft Ir ◽  
The Impact ◽  
Sulfur Containing

<p>The aim of this research was the synthesis of polymers with the addition of S,S'-thiodi-4,1-phenylene bis(thiomethacrylate) (DMSPS) by bulk polymerization. Styrene (St), divinylbenzene (DVB) and ethylene glycol dimethacrylate (EGDMA) were used for the copolymerization as main monomers. The chemical structures of sulfur-containing polymers were confirmed by the spectroscopic analysis (ATR/FT-IR). In order to determine the impact of the sulfur derivative (DMSPS) addition on thermal properties of the obtained copolymers, differential scanning calorimetry (DSC) was performed. The hardness tests of the obtained copolymers were also applied using a Shore durometer.</p>

scholarly journals Bio-Based Polyurethane Composites and Hybrid Composites Containing a New Type of Bio-Polyol and Addition of Natural and Synthetic Fibers

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2028 ◽  
Author(s):  
Adam Olszewski ◽  
Paulina Kosmela ◽  
Aleksandra Mielewczyk-Gryń ◽  
Łukasz Piszczyk
Keyword(s):  
Hybrid Composites ◽  
Sem Analysis ◽  
Sisal Fiber ◽  
Synthetic Fibers ◽  
The Matrix ◽  
New Type ◽  
Liquefaction Process ◽  
Sisal Fibers ◽  
Polyurethane Composites ◽  
The Impact

This article describes how new bio-based polyol during the liquefaction process can be obtained. Selected polyol was tested in the production of polyurethane resins. Moreover, this research describes the process of manufacturing polyurethane materials and the impact of two different types of fibers—synthetic and natural (glass and sisal fibers)—on the properties of composites. The best properties were achieved at a reaction temperature of 150 °C and a time of 6 h. The hydroxyl number of bio-based polyol was 475 mg KOH/g. Composites were obtained by hot pressing for 15 min at 100 °C and under a pressure of 10 MPa. Conducted researches show the improvement of flexural strength, impact strength, hardness, an increase of storage modulus of obtained materials, and an increase of glass transition temperature of hard segments with an increasing amount of fibers. SEM analysis determined better adhesion of sisal fiber to the matrix and presence of cracks, holes, and voids inside the structure of composites.

Effect of Carbon Fibre Ratio to the Impact Properties of Hybrid Kenaf/Carbon Fibre Reinforced Epoxy Composites

2013 ◽  
Vol 393 ◽  
pp. 136-139 ◽  
Author(s):  
Mimi Azlina Abu Bakar ◽  
Sahrim Ahmad ◽  
Wahyu Kuntjoro ◽  
Salmiah Kasolang
Keyword(s):  
Carbon Fibre ◽  
Hybrid Composites ◽  
Epoxy Composites ◽  
Resin Matrix ◽  
Fibre Reinforcement ◽  
Carbon Fibres ◽  
Electron Microscopic ◽  
Impact Properties ◽  
The Matrix ◽  
The Impact

Effects of the incorporation of untreated and treated hybrid kenaf/carbon fibre reinforced epoxy composites on the impact properties were studied. Hybrid kenaf/carbon fibres and thermoset matrices were hand-laid up and characterized in terms of its mechanical properties. The kenaf fibres were alkali treated whilst the carbon fibres were gamma radiation treated before use as reinforcement in the epoxy resin matrix. The reinforcing effects of kenaf hybridized with carbon fibre in epoxy composites were evaluated at various fibre loadings with overall fibre contents 20 wt%. Hybrid composites with different ratios of kenaf fibre : carbon fibre ; 0.9:0.1, 0.8:0.2, 0.7:0.3 and 0.6:0.4 were prepared. Impact tests of untreated and treated hybrid kenaf/carbon fibres were performed. The fractured surfaces of these composites were investigated by using scanning electron microscopic technique (SEM) to determine the interfacial bonding between the matrix and the fibre reinforcement. It was found that the treated hybrid composites increased the impact strength by 26% compared to the untreated ones.

Effect of the Surface Morphology of Calcium Carbonate on the Impact Toughness of Polyamide 6/EPDM-M/CaCO3 Ternary Composites

2011 ◽  
Vol 391-392 ◽  
pp. 1259-1262
Author(s):  
Yu Xin Dong ◽  
Yong Jie Wang ◽  
Xiao Peng Xu ◽  
Si Chen ◽  
Yan Qin Shi ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Impact Toughness ◽  
Surface Morphology ◽  
Surface Area ◽  
Polyamide 6 ◽  
The Matrix ◽  
Izod Impact ◽  
The Impact ◽  
Ethylene Propylene Diene Terpolymer

Ternary composites of polyamide 6 (PA6), mixed with unmaleated ethylene propylene diene terpolymer rubber (named as EPDM-M) and calcium carbonate (CaCO3, with three different kinds of surface morphology) were prepared via two-step melt blending process. The influence of surface morphology of CaCO3 on the impact toughness of PA6/EPDM-M/CaCO3 was investigated. It was found that the Izod impact strength of the composites improved with increasing of the surface area of CaCO3. The characterization of CaCO3 by BET tester and scanning electron microscope (SEM) obviously showed that both needle-shaped CaCO3 and spherical CaCO3 were have a bigger specific surface area and rougher morphology than ground CaCO3. So they have a better toughen effect, which was well explained the results of impact test. Morphology observed on the impact fracture revealed that the formation of voids by the debonding of CaCO3, which could trigger the matrix emerged obvious plastic deformation in the composites that included needle-shaped CaCO3 or spherical CaCO3. This phenomenon also can be demonstrated that needle-shaped CaCO3 and spherical CaCO3 had superior toughen effective. Consequently, the surface morphology of CaCO3 had a distinctive effect on the toughness of PA6/EPDM-M/CaCO3 Composites.

scholarly journals A Study of Characteristics of Aluminum Bronze Coatings Applied to Steel Using Additive Technologies

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 461 ◽  
Author(s):  
Marina Samodurova ◽  
Nataliya Shaburova ◽  
Olga Samoilova ◽  
Liudmila Radionova ◽  
Ramil’ Zakirov ◽  
...  
Keyword(s):  
Composite Material ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Laser Power ◽  
Additive Technologies ◽  
Aluminum Bronze ◽  
Coating Materials ◽  
The Matrix ◽  
Coating Microstructure ◽  
Bronze Matrix

The influence of laser power on the microstructural, strength, and tribological characteristics of aluminum bronze coatings applied to steel by laser cladding was studied. It was found that with an increase in laser power, the morphology of the coating surface becomes more uniform without extreme height differences. This study revealed that the coating microstructure corresponds to that of a composite material and consists of a bronze matrix and iron dendrites of different sizes (depending on the laser power). Such a microstructure affects the microhardness indices, which have a scatter of values over the coating thickness. There is a diffusion zone at the steel–bronze interface, which promotes adhesion of the matrix and coating materials. According to the results of tribological tests, the dry friction coefficient for the studied samples is in the range of 0.389–0.574.

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