Main Subjects : Material
Martensitic Stainless Steel Brazing by Using Ag-Cu-Ti as Active Filler Metal Alloys
Engineering and Technology Journal,
2023, Volume 41, Issue 6, Pages 1-8
DOI:
10.30684/etj.2023.136810.1325

Evaluation of PCL Electrospun Scaffolds Concentration on Metformin Hydrochloride Release Ratio
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1671-1682
DOI:
10.30684/etj.2021.131990.1079

The Impacts of Calcium Ions Substitution in Hydroxyapatite with Neodymium and Zinc on Biological Properties and Osteosarcoma Cells
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1650-1658
DOI:
10.30684/etj.2022.133915.1217

Epoxy-Nanoceramic Composites for 5G Antennas
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1795-1802
DOI:
10.30684/etj.2022.134894.1254

Characterization of the Efficiency of Photo-Catalytic Ultrafiltation PES Membrane Modified with Tungsten Oxide in the Removal of Tinzaparin Sodium
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1633-1641
DOI:
10.30684/etj.2022.134070.1219

Nanocatalyst for the Degradation of Plastic Waste to Produce Paints
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1757-1764
DOI:
10.30684/etj.2022.132459.1118

Investigation of Compression and Hardness for UHMWPE Bio-composites as Internal Bone Plate Fixation
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1783-1794
DOI:
10.30684/etj.2022.135083.1258

An Investigation on The Effect of Carbon Nanoparticles on The Properties of Carbon Brushes
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1744-1756
DOI:
10.30684/etj.2022.135387.1270
The demand for carbon brushes with specific properties and improvements in production economics in recent years has led to increased interest in metal-graphite composites. Metal matrix composites are considered excellent materials to obtain properties superior to those of the constituent phases and meet the specific requirements of material application. In the present study, we suggested a new composite material by utilizing nanomaterials to improve the properties of metal-graphite composite material usually used as carbon brushes. This has been achieved by adding different percentages of 0.1-0.5wt % of carbon nanotubes, carbon nanospheres, or both to the metal matrix composite. The samples were prepared by powder metallurgy technique. The XRD results gave a sharp line and indicated a high crystalline structure and little amorphous, which improved the conductivity performance of the composite produced within the structure of this work. The density measurement chart results showed an increase in the amounts of the carbon nano additives leading to a decrease in the density of the sample. The investigation of nano additives on hardness showed that increases in the additive led to reduced hardness. On the other hand, the resistivity values have reduced gradually when there is an increase in the amounts of the carbon nano additives, especially on the CNT, which gives better results than CNS, which we obtained the resistivity value =(0.32 Ωcm), Comparing with commercial-grade containing free of nano additives (1.3Ω cm).
Effect of Adding MgO on Microstructure of Zirconia Toughened Alumina (ZTA) Composite for Medical Applications
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1731-1743
DOI:
10.30684/etj.2022.134694.1245

Investigating the Effect of Different Parameters on Physical Properties of Metakaolin-Based Geopolymers
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1702-1711
DOI:
10.30684/etj.2022.132691.1138

The Effect of Ceo2 Addition on Transformation Temperatures and Wear Resistance of Cu-Al-Ni Shape Memory Alloys
Engineering and Technology Journal,
2022, Volume 40, Issue 12, Pages 1712-1722
DOI:
10.30684/etj.2022.132840.1144

Synthesis ZnO heterostructured nanophotocatalyst simulated solar light irradiation for removal contaminate Carbamazepine in aqueous solution
Engineering and Technology Journal,
2022, Volume 40, Issue 6, Pages 901-910
DOI:
10.30684/etj.2021.131136.1007

Structural Characterization of (Mg(1-x)pbxO)-NPs by Modified Pechini Method
Engineering and Technology Journal,
2022, Volume 40, Issue 6, Pages 11-20
DOI:
10.30684/etj.v40i6.2147

Preparation of CuO/ZnO Nano-Particles Using Sol-Gel Technique and Studying the Characterization
Engineering and Technology Journal,
2022, Volume 40, Issue 6, Pages 862-868
DOI:
10.30684/etj.v40i6.2104

Properties of Welded Copper Tubes Fabricated Via Friction crush Welding
Engineering and Technology Journal,
2022, Volume 40, Issue 6, Pages 840-847
DOI:
10.30684/etj.v40i6.2292

Electrostatic Deposition of Poly(Methyl Methacrylate)/Titanium Carbide Coatings on Austenitic 316L Stainless Steel Implant
Engineering and Technology Journal,
2022, Volume 40, Issue 6, Pages 918-925
DOI:
10.30684/etj.2022.131478.1038

Study the Growth of Apatite Layer on Biodegradable Glass as Bioactive Scaffolds
Engineering and Technology Journal,
2022, Volume 40, Issue 6, Pages 892-900
DOI:
10.30684/etj.2021.131678.1048

Effect of the Waste Rubber Tires Aggregate on Some Properties of Normal Concrete
Engineering and Technology Journal,
2022, Volume 40, Issue 1, Pages 275-281
DOI:
10.30684/etj.v40i1.2166
Waste rubber tires are considered to have substantial environmental and economic impacts, and they are non-biodegradable. This study aims to get rid of waste tires as much as possible and study their benefits and effects on concrete using (chips and crumbs) as an aggregate substitution to fine and coarse aggregates together in making concrete (CRC) and at different percentages of (5, 10, 15, 20, and 25) % by volume. This use can reduce the risk and effect of waste tires. The tests reported a reduction in workability, compressive, and flexural values with the increase in the substitution rate of rubber. Still, other properties such as density and thermal conductivity improved. The registered highest decrease was 2013 kg/cm³ to density and 0.56 (W/m.k) to thermal conductivity with replacement of 50% from waste rubber tiers as an aggregate. The workability registered the highest decrease of 35 mm, compressive strength was 18.5 MPa, and flexural was 3.35 MPa. However, the failure of the (CRC) samples test was not as brittle and abrupt as in the control sample (NSC) in the flexural test.
Preparation of Metakaolin Based Geopolymer Foam Using a Combination of Na and K Types of Alkali Activators
Engineering and Technology Journal,
2022, Volume 40, Issue 1, Pages 282-289
DOI:
10.30684/etj.v40i1.2188
In this research, the ordinary Portland cement (OPC) was mixed with metakaolin, activator, hydrogen peroxide, and olive oil to synthesize hybrid geopolymer foam. The obtained results indicated internal heat release throughout OPC hydration in the combination. OPC was employed as a calcium source in geopolymers (Geopolymer-Portland cement (HGPF)) to explore the curing process of geopolymers at ambient temperature. The functionality of geopolymer components and (HGPF) mixture, the elemental composition, and proportion analyses have been compared. A principal aim of this research focuses on developing geopolymer foam and conducting many tests such as physical tests related to the surface area and pores size and compression of the foam to investigate the capacity of applying this foam in different applications that require good strength. Furthermore, microstructure tests using SEM and XRD techniques have been conducted to examine surface structure components. Overall, the findings presented in this research show that the materials selected to develop the geopolymer foam were compatible with each other giving high porosity with acceptable compression via optimizing the processing parameters by RSM.
Recycling of Wood – Plastic Composite Prepared from Poly (Ethylene Terephthalate) and Wood Sawdust
Engineering and Technology Journal,
2021, Volume 39, Issue 11, Pages 1654-1662
DOI:
10.30684/etj.v39i11.2203
Plastic waste has become one of the humanities and the ecosystem balance serious environmental Challenges. Furthermore, it is the primary source of plastic pollution because it is inexpensive, widely available, and frequently discarded. Using various waste materials and side fractions as part of wood-plastic composites is one way to promote the circular economy (WPC). Several environmental benefits can be realized by using recycled plastic, including extending the usable life of plastic, reducing waste, contributing to the development of trash recycling, and preventing resource depletion. One of the most efficient recycling processes is glycolysis; the (PET) is depolymerized by ethylene glycol in continuous stirring reactors at temperatures between 200 and 220◦C using glycol as solvent. This work concentrates on the experimental investigation of composite materials from DE polymerization PET, Unsaturated polyester, and VV/55 as a matrix and wood sawdust as reinforcement. The composite samples were checked by the Hardness test, water test, and density test. According to the experimental results, the optimum value is at (2%) wood percentage, giving high hardness value, low density, and low water absorption.
Wild Clary Plant Extract as Corrosion Inhibitor for Carbon Steel in Seawater Medium
Engineering and Technology Journal,
2021, Volume 39, Issue 11, Pages 1646-1653
DOI:
10.30684/etj.v39i11.2151
Aqueous extract of wild clary has been used in place of a corrosion inhibitor in the corrosion control of carbon steel. The major components of this extract are Ethan amine, Amino-octadic, and 4H-Pyran-4-one. It has an excellent inhibition efficiency (IE) of 83.078% at a concentration of 20 (mL/L) and a temperature of 298 (K). The extract was characterized by FTIR and GC MS, where the antibacterial was tested and the protective film was analyzed on the samples using FTIR spectra. The protective film formed on the metal surface is confirmed using an electrochemical study by Potentiostat, which revealed that this extract was a mixed-type inhibitor.
Investigation of the Effect of Microcapsule Additive on Mechanical and Physical Properties of Concrete
Engineering and Technology Journal,
2021, Volume 39, Issue 11, Pages 1639-1645
DOI:
10.30684/etj.v39i11.2091
Cracks are a fundamental problem in concrete, so this research investigates an experimental study of the effect of adding SiO2 on the self-healing behaviour of concrete. The study is done by studying the physical properties, microstructure, and mechanical properties of concrete. Microcapsules were prepared to contain (cement and nano SiO2) in a (palettization (fluidize bed coating) method) with (5,10, and 15) % of cement weight. The ratio of the prepared concrete mixture was (1: 2: 4) and the ratio of water to cement (W / C) 0.45 by the weight of cement was also added as 0.6% Superplasticizer to all concrete mixtures. SiO2 MC is added with (2.5) % of the cement weight in the concrete mixture. In this study, porosity, density, and water absorption tests were performed to study the physical properties, compressive and bending strength to study mechanical properties. So, referring to the results, (SiO2 MC) was used as an effective effect in the self-healing cracking mechanism, and in improving the bending strength and compressive strength. Also, 10 % wt. was recorded as the best addition because it has a positive effect on properties to be applied in construction.
Investigation of Some Properties for Laminated Composite Used for Prosthetic Socket
Engineering and Technology Journal,
2021, Volume 39, Issue 11, Pages 1625-1631
DOI:
10.30684/etj.v39i11.2050
Polyester has been used as a prosthetic socket base. It is well documented that the raw material of the socket base should have exhibited good mechanical properties. Prosthetic socket is a device that connects an artificial limb with the amputee part. In this work, seven laminated composites were prepared using vacuum technique from polyester resin and reinforced with Jute, Carbon, Glass, and Perlon fibers. The objective of this study is to manufacture prosthetic sockets from different laminated composite materials (fibers reinforced polymer) to make high-strength and durable prosthetic socket design. The results showed that the best laminated composite specimens have three jute fiber layers with four carbon layers whose compression strength and hardness reach (67) MPa and (86) Shore-D, respectively. Also, the water absorption of the composite specimen of jute with carbon fibers is higher than that of the composite specimen of jute with glass fiber.
Improve the Corrosion Resistance of the Copper-Zinc Alloy by the Epoxy-WO3 Nanocomposite Coating
Engineering and Technology Journal,
2021, Volume 39, Issue 11, Pages 1669-1673
DOI:
10.30684/etj.v39i11.2225
Metal corrosion is one of the most critical challenges in industrial processes. In this research, nanocomposite coating was synthesized by blending tungsten trioxide (WO3) nanoparticles with Epoxy resin and applied on brass samples to evaluate the performance of corrosion protection under stressed environments. A dip-coating method was adopted to coat the brass sample's surface. Coated and uncoated brass samples have been subjected to corrosion tests to study the corrosion behavior when exposed to corrosive media. Obtained results indicated that the brass coated samples with mixed epoxy\tungsten trioxide (WO3) exhibited reasonable corrosion resistance because of the ceramic protective barrier on the surface of the metal. Therefore, the proposed methodology could be considered as a promising surface coating that promotes corrosion resistance under stressed industrial conditions.
Electrophoretic Deposition Used to Prepare and Analyze the Microstructure of Chitosan/Hydroxyapatite Nano-Composites
Engineering and Technology Journal,
2021, Volume 39, Issue 11, Pages 1693-1704
DOI:
10.30684/etj.v39i11.2181
This research studies the coating layer properties from chitosan and nano –hydroxyapatite made by pulsed electrophoretic deposition (PEPD) for biomedical applications. The 316L SS alloys were coated with hydroxyapatite in different solutions in 100 mL of suspension at a 30 V continuous voltage. To characterize the deposited coatings, X-ray diffraction spectroscopy (XRD), Fourier transform infrared (FTIR), Contact Angle, scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX),Yield deposition and Optical microscopy structural (OM) was used for coating layer, in addition to being calculated Zeta potential for suspensions. The aim of this study is to show that using the Pulsed EPD method at room temperature, a simple and low-cost solution for in situ synthesis of Nano -HAp within a chitosan matrix for biomedical applications can be demonstrated.
Preparation and Characterization of Polymer Blend and Nano Composite Materials Based on PMMA Used for Bone Tissue Regeneration
Engineering and Technology Journal,
2020, Volume 38, Issue 4A, Pages 501-509
DOI:
10.30684/etj.v38i4A.383
As the elderly population increases, the need for bone loss treatments is increasing. Vital substances used in such treatments are required to continue for a longer period and work more effectively. The particularly important biological material is poly methyl methacrylate (PMMA) bone cement, which is widely used in damaged bone replacement surgery. So, this study focused on the role of added some nanoparticles consist of zirconia (ZrO2), and magnesia (MgO) on the binary polymeric blend (Acrylic bone cement: 15% PMMA) for a bone scaffold. Where, ZrO2 and MgO nanoparticle was added with selected weight percentages (0, 0.5, 1, 1.5 and 2 wt.%), which were added to the polymer blend matrix. Some mechanical properties were studied including the tensile strength and young modulus for all the prepared samples. The chemical bonding of nanoparticles and synthetic binary polymeric blend composites was evaluated by Fourier Transform Infrared (FTIR) spectroscopy. Tensile strength and young modulus of binary polymeric blend reinforced with 1.5 wt.% ZrO2, and 1 wt.% MgO, significantly increased. The surface morphology of the fracture surface of tensile specimens was examined by Scanning electron microscope (SEM). The SEM images confirmed that the homogenous distribution of nanoparticles (ZrO2, and MgO) within the polymeric blend matrix.
Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC
Engineering and Technology Journal,
2020, Volume 38, Issue 4A, Pages 491-500
DOI:
10.30684/etj.v38i4A.351
In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.