Applied sciences

Archives of Metallurgy and Materials

Content

Archives of Metallurgy and Materials | 2024 | vol. 69 | No 4

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Abstract

Light-powered micromotors are a new type of micromotor that can be used for water purification treatment. This paper focuses on the synthesis processes and its application in water remediation. This mini review will highlight the great potential of these light powered micromotor as well as the significance of preparing them for environmental applications. Photocatalytic micromotors or light-powered micromotors have been intensively researched over the last several years for several applications, such as environmental remediation, biomedicine and micropumps. It has been found that conventional wastewater treatment is commercially inefficient in water remediation. The emphasis then was on a new solution of using micromotor as a potential replacement for water remediation. Many studies have been carried out over the years on the synthesis of these light-powered micromotors, which revolves around the materials used, and applications. This paper, therefore, reflects on the advancement of light-powered micromotors and will be concentrating on the synthesis processes and its application in water remediation. This mini-review will highlight the great potential of these light-driven micromotors as well as the significance of preparing them for environmental applications.
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Authors and Affiliations

M.S. Osman
1 2
M. Ismail
3
K. Khairudin
1 4
M. Fathullah
5 2
ORCID: ORCID
C. Rojviriya
6
N.F. Abu Bakar
6
M.R. Mohd Radzi
1
N. Isa
1

  1. Universiti Teknologi MARA EMZI-UiTM Nanoparticles Colloids & Interface Industrial Research Laboratory (NANO-CORE), Chemical Engineering Studies, College of Engineering, Cawangan Pulau Pinang, Permatang Pauh Campus, 13500 Pulau Pinang, Malaysia
  2. Center of Excellence Geopolymer & Green Technology (CEGeoGTech), 01000 Kangar, Perlis, Malaysia
  3. EMZI Holding Sdn Bhd, H-2, Avenue 2/1, Kedah Halal Park,08000 Sungai Petani, Kedah, Malaysia
  4. Universiti Teknologi MARA Shah Alam, School of Chemical Engineering, College of Engineering, 40450 Shah Alam, Selangor, Malaysia
  5. Universiti Malaysia Perlis (UniMAP), School of Manufacturing Engineering, Pauh Putra Campus, 02600 Arau, Perlis, Malaysia
  6. Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, 30000, Thailand
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Abstract

In the current era, concern about the responsible disposal of industrial waste and its reuse has increased in all societies from the industry. Therefore, the researchers’ institution is focusing its efforts on developing more environmentally friendly products from recycled waste, particularly in the area of sustainable construction. For instance, one of recycled waste is Coal Bottom Ash (CBA), a by-product of coal combustion that is produced in large quantities from thermal power plants. The aims of this study to investigate the physical, chemical and element characteristics of CBA obtained from thermal power plant in Malaysia. Also, CBA compared with cement characteristics to be used as cement replacement in the concrete mixture. Therefore, numerous tests have been performed to investigate CBA’s physical and chemical characteristics. For physical properties such as specific gravity, particle size analysis, fineness modulus, bulk density and loss on ignition. For chemical properties such as X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) in an effort to obtain sustainable materials from thermal power plant waste. Based on the findings in this study, it can be concluded that CBA can be utilized as cement substitute in the production of concrete mixtures.
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Authors and Affiliations

Mohammad I. Al Biajawi
1
R. Embong
1
ORCID: ORCID
M.M. Al Bakri Abdullah
2
ORCID: ORCID

  1. Universiti Malaysia Pahang Al-Sultan Abdullah (UMPSA), Faculty of Civil Engineering Technology, Persiaran Tun Khalil Yaakob, 26300, Pahang, Malaysia
  2. Universiti Malaysia Perlis (UniMAP), Geopolymer & Green Technology, Centre of Excellence (CEGeoGTech), Perlis, Malaysia
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Abstract

The publication presents and reviews the results of a physical modelling study of the Cross Wedge Rolling process of ball-studs. The ball-studs was formed in a double system from C45 steel at 1050°C, while the physical modelling process was performed on a scale of 1:2.5 using Primo plasticine as the model material, which was formed at 5°C. For the real tests, steel tools were used, while for the model tests the tools were made of ABS plastic. The experimental tests were followed by measurements of the individual stud steps. The geometrical analysis of the specimens showed that the model material allowed the shape of the forging obtained in the rolling process to be accurately modelled. Based on the physical modelling studies of the Cross Wedge Rolling process of ball-studs, it was concluded that the ball-studs rolling process can be modelled using PRI MO plasticine. Based on the analysis of the physical modelling results obtained, it was concluded that physical modelling allows the Cross Wedge Rolling process to be modelled with a high convergence of the results obtained in real and physical tests.
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Authors and Affiliations

Ł. Wójcik
1
ORCID: ORCID
Z. Pater
1
ORCID: ORCID

  1. Lublin University of Technology, 38 D. Nadbystrzycka Str., 20-618 Lublin, Poland
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Abstract

A waste of electrical power cables becomes a major problem at the present time, so they must be disposed in order to preserve the environment, and to obtain a raw material for the industry with low cost. In this work, recycled materials is prepared by heating up the aluminum wires up to 650°C for melting to prepare the aluminum alloy as a matrix. Then, the matrix reinforced by the nanoparticles (30 nm) of aluminum oxide (Al2O3) to prepare the composite using the stir casting technique. The electrical discharge machining (EDM) as advanced machining, is used to evaluate the materials behavior through the operation. Taguchi method is used to design and determine the suitable input and output factors. The scanning electron microscope (SEM) and hardness are tested before and after machining. The results appeared that improving in microstructure, also the hardness of the composite improved (37.2% and 22.6%) before and after machining.
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Authors and Affiliations

S.H.A. Alfatlawi
1
ORCID: ORCID
N.M. Khabou
2
W.A. Mughir
1

  1. University of Babylon, College of Material’s Engineering, Iraq
  2. University of Sfax, Electromechanical Systems Laboratory (LASEM), National Engineering School of Sfax, BP 1173 3038 Sfax, Tunsia
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Abstract

Pulse-echo ultrasonic test, which is one of the non-destructive testing methods, was used to measure ultrasonic quantities such as longitudinal velocity (VL), shear velocity (VT) and attenuation coefficient (α) in FeCrMn composites. The corresponding elastic constants were determined depending on the longitudinal and transverse velocity. The aim was to reveal the correlation between the microstructural and mechanical properties of FeCrMn composites and ultrasonic quantities. The effect of adding Cr particles on VL and VT velocities is obviously attributed to the change in elastic and shear modulus of FeCrMn composites. It was found that both VL and VT velocities, Young’s modulus (E) and shear modulus (G), as well as hardness values, changed approximately linearly with increasing Cr content. In this study, samples with different volumetric compositions were produced using the powder metallurgy method. It has been revealed that both the applied method and the increase in the amount of Cr have a significant effect on the velocities of VL and VT. The increase in VL and VT is due to the increase of Cr particles, the homogeneous distribution of Cr, the formation of samples especially at a certain temperature, and the decrease of porosity. As a result of these, a decrease in attenuation values was observed depending on the mean grain size. Elastic constants were found to vary in the same way as ultrasonic velocities. By increasing the Cr content both the hardness values and the shear modulus were improved and a good correlation was observed with the grain size.
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Authors and Affiliations

V. Özkan Bilici
1
ORCID: ORCID
A. Yönetken
2
ORCID: ORCID

  1. Afyon Kocatepe University, Physics Dept., 03200, Afyonkarahisar, Turkey Turkey
  2. Afyon Kocatepe University, Engineering Faculty, Electrical Engineering Dept., ANS Campus 03200, Afyonkarahisar, Turkey
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Abstract

The relationship between barrel configurations and porosity of a Ni-based amorphous coating (AM) that is fabricated using a high-velocity air fuel (HVAF) process was revealed by both numerical and experimental methods. A computational fluid dynamics model was applied to investigate the gas-flow field and the behavior of in-flight particles with various barrel configurations. It is found that barrel length obviously affects the particle velocity and temperature while it has a slight influence on the particle velocity and temperature. The longer the barrel length (diameter), the higher the flame (particle) velocity and temperature. By analyzing both particle velocity and temperature, the optimal barrel configuration (4E) to achieve low-porosity coatings was predicted. These calculations were experimentally verified by the production of a low-porosity (2.09%) Ni-based AM that was fabricated by HVAF using the predicted optimal barrel configuration.
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Authors and Affiliations

Nianchu Wu
1
ORCID: ORCID
Tingting Li
1
Xiaotian Su
1

  1. Liaoning Petrochemical University, School of Mechanical Engineering, Fushun, 113001, P.R. China