scholarly journals Characteristics of Porous Aluminium Materials Produced by Pressing Sodium Chloride into Their Melts

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4809
Author(s):  
Iva Nová ◽  
Karel Fraňa ◽  
Pavel Solfronk ◽  
Jiří Sobotka ◽  
David Koreček ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Sodium Chloride ◽  
Scanning Electron Microscope ◽  
Relative Density ◽  
Aluminium Alloy ◽  
Particle Sizes ◽  
Computed Tomograph ◽  
Air Cells ◽  
Scanning Electron ◽  
Unconventional Method

The paper deals with research related to the production of metal cellular aluminium systems, in which production is based on the application of sodium chloride particles. In this paper, the properties of porous aluminium materials that were produced by an unconventional method—by pressing salt particles into the melt of aluminium alloy—are described. The new methodology was developed and verified for the production of these materials. The main feature of this methodology is a hydraulic forming press and a simple-shaped foundry mould. For these purposes, four different groups of sodium chloride particle sizes (1 to 3, 3 to 5, 5 to 7 and 8 to 10 mm) were applied. The preferred aluminium foundry alloy (AlSi12) was used to produce the porous aluminium samples. Based upon this developed methodology, samples of porous aluminium materials were produced and analysed. Their weight and volume were monitored, their density and relative density were calculated, and their porosity was determined. In addition, the porosity of samples and continuity of their air cells were monitored as well. An industrial computed tomograph and a scanning electron microscope were applied for these purposes.

Effect of Crystal Orientation Agents on Morphology of Nano-CaCO3

2015 ◽  
Vol 723 ◽  
pp. 544-547
Author(s):  
Xiang Wei Cheng ◽  
Da Jin Xiong ◽  
Chao Huo
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Crystal Orientation ◽  
Average Particle ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
Calcite Crystal ◽  
X Ray ◽  
Different Shapes ◽  
Scanning Electron

Using intermittent bubbling carbonation method to prepare nanoCaCO3, the effect of crystal orientation agents on the morphology of nanoCaCO3 was studied. The nanoCaCO3 was characterized by means of field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), Laser particle analyzer. The results showed that the different shapes nanoCaCO3 was synthesized by adding different crystal orientation agents to control the shape of the product. The as-prepared CaCO3 were pure calcite crystal and the average particle sizes were within the range of 25.7 to 60.9 nm.

Control of the Crystal Morphological Characteristic and Size of Nano-PCC via Turbo-Mixing Reactive Precipitation

2015 ◽  
Vol 754-755 ◽  
pp. 770-774
Author(s):  
Mohd Darus Daud ◽  
Aimi Noorliyana Hashim ◽  
Azmi Rahmat ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Ahmad Hadzrul Iqwan Jalauddin
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Rotation Speed ◽  
Average Particle Size ◽  
Average Particle ◽  
Particle Sizes ◽  
Mixing Conditions ◽  
Precipitated Calcium Carbonate ◽  
Novel Technology ◽  
Scanning Electron

An innovative and novel technology method of processing called Turbo-Mixing Reactive Precipitation (TMRP) design proposed as an alternative to this current processing or conventional productions of fine precipitated calcium carbonate (nanoPCC) in turbo-mixing conditions. In this paper, the effect of the stirring rate onto morphology, particle sizes and reaction time of the precipitated CaCO3 particles was discussed. CaCO3 nanoparticles with an average particle size of approximately 15.75 nm were successfully obtained by stirring rotation speed at 900 rpm. The structural analysis was conducted using a Scanning Electron Microscope (SEM) and a Field Emission Scanning Electron Microscope (FESEM). The results showed that the increasing of the multiple’s impeller stirring rotation speed is in favor of the formation of the spherical vaterite.

Microstructure and Mechanical Properties of Ti-Al-Mo-V-Ta Alloys

2013 ◽  
Vol 785-786 ◽  
pp. 86-90
Author(s):  
D.H. Xiao ◽  
X.X. Li ◽  
X.Z. Wu ◽  
Dan Liu ◽  
Y.S. Zhang
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Relative Density ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alpha Beta ◽  
Hot Pressing Sintering ◽  
Scanning Electron

P/M Ti-Al-Mo-V-Ta alpha-beta alloys were processed by hot-pressing sintering technique. The effects of Ta additions on microstructure and properties of the Ti-5Al-4Mo-4V alloys were investigated using X-ray diffraction, optical microscope, scanning electron microscope and mechanical properties tests. The results show that minor Ta addition improves the relative density and the mechanical properties of P/M Ti-5Al-4Mo-4V alloys. After sintering for 4h at 1623 K, the relative density and compression strength of Ti-5Al-4Mo-4V-5Ta alloy are 99.3% and 1950 MPa.

An experimental study on the deformation behaviour and fracture mode of recycled aluminium alloy AA6061-reinforced alumina oxide undergoing high-velocity impact

2020 ◽  
Vol 234 (23) ◽  
pp. 4659-4670
Author(s):  
MK Mohd Nor ◽  
CS Ho ◽  
FNA Janudin
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Aluminium Alloy ◽  
Impact Velocity ◽  
Damage Evolution ◽  
Deformation Behaviour ◽  
Alumina Oxide ◽  
Impact Area ◽  
The Impact ◽  
Scanning Electron

The anisotropic behaviour and the damage evolution of recycled aluminium alloy-reinforced alumina oxide are investigated in this paper using Taylor impact test. The test is performed at various impact velocity ranging from 190 to 360 m/s by firing a cylindrical projectile towards anvil target. The deformation behaviour and the fracture modes are analysed using the digitized footprint of the deformed specimens. The damage initiation and the progression are observed around the impact surface and the surface 0.5 cm from the impact area using the scanning electron microscope. The deformed specimens showed several ductile fracture modes of mushrooming, tensile splitting and petalling. The critical impact velocity is defined below 280 m/s. The specimens showed a strong strain-rate dependency due to the damage evolution that is driven by severe localized plastic-strain deformation. The scanning electron microscope analysis showed the damage mechanism progress via voids initiation, growth and coalescence in the material. The micrograph within the footprint surface shows the presence of alumina oxide particles within the specimen. The microstructure analysis shows a significant refinement of the specimen particle at the surface located 0.5 cm above the impact area. ImageJ software is adopted in this work to measure the average size of voids within this surface. Non-symmetrical (ellipse-shaped) footprint around the footprints showed plastic anisotropic behaviour. The results in this paper provide a better understanding of the deformation behaviour of recycled materials subjected to dynamic loading. This information on mechanical response is crucial before any potential application can be established to substitute the primary sources.

scholarly journals Effect of Quartz-Silicon Dioxide Particulate on Tensile Properties of Aluminium Alloy Cast Composites

2011 ◽  
Vol 471-472 ◽  
pp. 727-732 ◽  
Author(s):  
Mohd Sayuti ◽  
Shamsuddin Sulaiman ◽  
B.T. Hang Tuah Baharudin ◽  
Mohd Khairol A. Arifin ◽  
T.R. Vijayaram ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silicon Dioxide ◽  
Aluminium Alloy ◽  
Tensile Properties ◽  
Tensile Tests ◽  
Moulding Process ◽  
Particulate Reinforced ◽  
Scanning Electron

This paper describes an experimental investigation of the tensile properties of quartz-silicon dioxide particulate reinforced LM6 aluminium alloy composite. In this experimental, quartz-silicon dioxide particulate reinforced LM6 composite were fabricated by carbon dioxide sand moulding process with variation of the particulate content on percentage of weight. Tensile tests were conducted to determine tensile strength and modulus of elasticity followed by fracture surface analysis using scanning electron microscope to characterize the morphological aspects of the test samples after tensile testing. The results show that the tensile strength of the composites decreased with increasing of quartz particulate content. In addition, this research article is well featured by the particulate-matrix bonding and interface studies which have been conducted to understand the processed composite materials mechanical behaviour. It was well supported by the fractographs taken using the scanning electron microscope (SEM). The composition of SiO2 particulate in composite was increased as shown in EDX Spectrum and Fractograph.

scholarly journals Tribological, Thermal and Corrosive behaviour of aluminium alloy 2219 reinforced by Si3N4 nanosized powder

2021 ◽  
Author(s):  
Manjunatha C J ◽  
B. Venkata Narayana ◽  
D Bino Prince Raja ◽  
Rimal Isaac R S
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Aluminium Alloy ◽  
Corrosion Behaviour ◽  
Thermo Gravimetric Analysis ◽  
Stir Casting ◽  
High Energy ◽  
Gravimetric Analysis ◽  
Test Pieces ◽  
Scanning Electron

Abstract The MMC technique is the most effective contrast method when compared with other techniques. By using the method of high energy stir casting, Aluminium alloy Al2219 is reinforced with various percentages of Si3N4 (0, 3, 6, and 9%) particles. X-ray diffraction along with Scanning electron microscope was performed to characterize the composite. The mechanical and thermal behaviours such as differential thermal analysis thermo gravimetric analysis/, tensile , wear and hardness behaviours were investigated. By using electro chemical potentiodynamic polarization test, the consequence of heat treatment on the corrosion behaviour of the composites when compared to its matrix in 3.5 % NaCl when at 600 rpm was also investigated. In this experimental study, the wear of the aluminium composites was significantly decreased on addition of Si3N4 particles. The study also revealed that, since the inclusion of Si3N4 in the samples and compared to the base aluminium alloy, the mechanical properties of the composites, such as wear resistance , hardness and tensile strength increased by percentage. The surface morphology and Scanning electron microscope analysis of worn surfaces in the test pieces unfold that with the increase in reinforcement content, wear rate decreases.

Multi-Phasic Nanocomposite Sol-Gel Processing of Cordierite

1988 ◽  
Vol 121 ◽  
Author(s):  
Ann Kazakos-Kijowski ◽  
Sridhar Komarneni ◽  
Rustum Roy
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Relative Density ◽  
Sol Gel ◽  
Heat Of Reaction ◽  
Nanocomposite Gels ◽  
Gel Processing ◽  
Scanning Electron ◽  
Three Components

ABSTRACTCordierite (Mg2Al4Si5O18) powders prepared from compositionally triphasic nanocomposite gels led to enhanced densification when compared to powders made by the conventional SSG route. The densification of the sintered cordierite pellets was determined by utilizing the Archimedes method and the microstructure of the pellets was examined with a scanning electron microscope (SEM). Bulk densities of monophasic, triphasic nanocomposite (two sols and one solution) and truly triphasic nanocomposite (three sols) pellets sintered at 1300°C for 2 hours were 2.01 g/cm3 (80% relative density), 2.42 g/cm3 (96% relative density) and 2.51 g/cm3 (100% relative density) respectively. The enhanced densification of α-cordierite utilizing triphasic nanocomposite sol-gel processing is, at least in part, due to the contribution of the heat of reaction from the three components.

The impact of soil structure and confining stress on the hydraulic conductivity of clays in brine environments

1992 ◽  
Vol 29 (5) ◽  
pp. 730-739 ◽  
Author(s):  
N. Yang ◽  
S. L. Barbour
Keyword(s):  
Electron Microscope ◽  
Sodium Chloride ◽  
Hydraulic Conductivity ◽  
Scanning Electron Microscope ◽  
Soil Structure ◽  
Confining Stress ◽  
Soil Structures ◽  
Initial Soil ◽  
Before And After ◽  
Scanning Electron

Numerous studies have been completed in recent years on the alteration of the hydraulic conductivity of clayey soils as a result of exposure to concentrated organic or inorganic permeants. These hydraulic conductivity changes have been attributed to either changes in microstructure, due to contraction of the diffuse double layer, or to the alteration of the macrostructure, as a result of volume changes leading to shrinkage fractures or fissures. In this paper, the change in hydraulic conductivity of a highly plastic natural clay during exposure to a concentrated sodium chloride (NaCl) solution is described. The performance of samples with three different initial soil structures, prepared by slurry, static compaction, and kneading compaction, were investigated under various levels of confining stress. Hydraulic conductivity tests were carried out before and after the samples were exposed to the NaCl solutions. Scanning electron microscope photography was used to compare the soil structures before and after brine permeation. The test results show that the alteration of hydraulic conductivity is strongly related to the initial soil structure and the level of confining stress. No significant change in the microfabric of the clay was observed; however, the size of the interaggregate pores appeared to increase as a result of the physicochemical volume change that occurred during brine permeation. The increase in hydraulic conductivity that occurred during brine permeation could be prevented by increasing the level of confining stress. The stress levels at which significant increases in hydraulic conductivity occurred appeared to be coincident with low levels of vertical stress which allowed the sample to undergo lateral shrinkage and a subsequent loss of confinement. Key words : hydraulic conductivity, clay soils, osmotic consolidation, sodium chloride brine, soil structure, scanning electron microscope.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

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