Subjects -> METALLURGY (Total: 58 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access  
Advanced Device Materials     Open Access   (Followers: 3)
American Journal of Fluid Dynamics     Open Access   (Followers: 47)
Archives of Metallurgy and Materials     Open Access   (Followers: 8)
Asian Journal of Materials Science     Open Access   (Followers: 5)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 20)
Complex Metals     Open Access   (Followers: 1)
Corrosion Communications     Open Access   (Followers: 5)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 19)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 10)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 3)
International Journal of Metals     Open Access   (Followers: 6)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 8)
International Journal of Mining and Geo-Engineering     Open Access  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 23)
Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Proceedings of Higher Schools. Powder Metallurgy аnd Functional Coatings)     Full-text available via subscription   (Followers: 2)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 32)
Journal of Advanced Joining Processes     Open Access  
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Heavy Metal Toxicity and Diseases     Open Access  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 7)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 1)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 18)
Journal of Metallurgical Engineering     Open Access   (Followers: 2)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Engineering     Open Access  
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 42)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 31)
Metallurgical and Materials Transactions E     Full-text available via subscription   (Followers: 2)
Metallurgical Research & Technology     Full-text available via subscription  
Metallurgical Research and Technology     Full-text available via subscription   (Followers: 6)
Metallurgy and Foundry Engineering     Open Access  
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 33)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 7)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Rare Metals     Hybrid Journal   (Followers: 1)
Revista de Metalurgia     Open Access  
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Revista Remetallica     Open Access  
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 4)
Soldering & Surface Mount Technology     Hybrid Journal   (Followers: 1)
Stainless Steel World     Full-text available via subscription   (Followers: 17)
Transactions of the IMF     Hybrid Journal   (Followers: 14)
Transactions of the Indian Institute of Metals     Hybrid Journal   (Followers: 4)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 1)
Welding in the World     Hybrid Journal   (Followers: 4)
Welding International     Hybrid Journal   (Followers: 7)
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  
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JOM Journal of the Minerals, Metals and Materials Society
Journal Prestige (SJR): 1.054
Citation Impact (citeScore): 2
Number of Followers: 32  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1543-1851 - ISSN (Online) 1047-4838
Published by Springer-Verlag Homepage  [2469 journals]
  • Basic Physical Properties of Aluminum Alloys and Their Electrolyte Systems
           Prepared by Molten Salt Electrolysis Using Black Aluminum Dross as Raw
           Material

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      Abstract: The density and surface tension of the proposed molten salt system of different components Na3AlF6-AlF3-CaF2-BAD were measured by Archimedes and separation methods at 940–980°C. The dissolution rate of black aluminum dross (BAD) and aluminum oxide in the electrolyte after denitrification was compared. The aluminum alloy was prepared from BAD raw materials, and the influence of BAD content on alloy composition was studied. The results showed that the electrolyte system density and surface tension exhibited a downward trend with increasing temperature, aluminum fluoride content, and BAD content. Other impurity elements in BAD had only limited influence on the density and surface tension of the electrolyte system. The dissolution rate of denitrified BAD in the electrolyte was slightly greater than that of alumina. The content of each metal element in the aluminum alloy increased with increasing proportion of BAD.
      PubDate: 2022-01-26
       
  • On the Influence of AlSi10Mg Powder Recycling Behavior in the LPBF Process
           and Consequences for Mechanical Properties

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      Abstract: By using additive manufacturing techniques like the laser powder bed fusion (LPBF) process, parts can be manufactured with high material efficiency because unfused powder material can be reconditioned and reused in consecutive manufacturing jobs. Nevertheless, process by-products like spatters may influence the powder quality and hence alter the mechanical properties/performance of parts. In order to investigate these dependencies, a methodology and a standard build job for the recycling behavior of the lightweight aluminum alloy AlSi10Mg was developed and built with ageing powder in 10 consecutive jobs with no refreshing between the cycles. The powder properties and mechanical performance of parts at static load for two build directions (horizontally and vertically to substrate plate) was evaluated. The influence of build height effects on mechanical performance was investigated as well. The findings may indicate that the coarsening of the powder material during recycling could lead to improved mechanical properties for the AlSi10Mg alloy.
      PubDate: 2022-01-26
       
  • Plastic Flow Under Shear-Compression at the Micron Scale-Application on
           Amorphous Silica at High Strain Rate

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      Abstract: A new measurement technique based on microshear has been developed. This technique, inspired from a macroscopic test called the Shear Compression Specimen, was developed at the micron scale by making the specimen using FIB technology, and by compressing it using an in situ SEM nano-indenter. The experimental tests applied on the fused silica show a good repeatability of the data, at low and high strain rates (2000 s−1). Numerical simulation revealed that the deformation in the Microshear Compression Specimen is mainly shear. This approach allows a better understanding of surface shear properties at the micron scale, which is of primary importance for tribological surfaces. It can also help to better understand the surface mechanical properties of pressure dependent materials. Finally, since the shear is applied on a very small gauge in the specimen, it opens the way to very high strain rate experiments (104 s−1 strain rate).
      PubDate: 2022-01-26
       
  • CO2 Gasification of Densified Biomass: The Influence of K on Reaction Rate

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      Abstract: The Boudouard reactivity of metallurgical coke and densified charcoals was investigated in this study. Potassium is known to accumulate in ferromanganese furnaces and hence was evaluated as a catalyst of CO2 reactivity. Samples were impregnated using a gaseous impregnation technique with K2CO3.The reactivity experiments were designed to simulate conditions occurring in an industrial furnace, as used for production of Mn-alloys. To find out the catalytic effect of potassium, the concentration varied from a fraction of a percent up to 5 wt.%. The results show that with increasing potassium content, the CO2 reactivity of coke and charcoal increased, and this change was more significant for coke. The CO2 reactivities of coke and densified charcoal were much closer to each other at the highest content of potassium. Scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS) showed that potassium distributed on the surface as well as on deposited carbon particles formed on densified charcoal.
      PubDate: 2022-01-25
       
  • Comparative Analysis of Structure and Properties of Nb-B Inoculated Direct
           Chill Cast AA4032 Alloy Extruded from As-Cast and Homogenized Conditions

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      Abstract: Al-Si wrought piston alloys can lack properties due to inefficient grain refining. A novel Al-Nb-B grain refiner was introduced some time ago, but has still not been assessed in industry for wrought alloys. This paper describes the first trial of Al-Ni-B addition and its impact on the full-scale manufacturing, structure, and properties of the AA4032 products extruded with and without billet homogenization. It is shown that Nb-B inoculation gives opportunities not only to have a refined as-cast structure but also a more homogenous distribution of the solute. In contrast, homogenization drives nucleation and coarsening of the Mg2Si phase that is retained during further extrusion and heat treatment also affecting the precipitation and properties. It was observed that non-homogenized specimens perform better during machining and tensile testing compared to homogenized specimens. The results are supported by electron microscopy investigations of microstructure formation during different steps in downstream processing.
      PubDate: 2022-01-25
       
  • Synthesis, Characterization, and Surface Analysis of Near-β Ti20Nb20Zr
           Alloy Proceeded by Powder Metallurgy for Biomedical Applications

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      Abstract: A new near-β Ti20Nb20Zr alloy was designed using d-electron alloy design and the molybdenum equivalence approach. Ball milling was used to synthesize the Ti20Nb20Zr alloy, and then it was sintered using spark plasma sintering. The structure and microstructure of the designed alloy were studied via x-ray diffraction and scanning electron microscope. The surface analysis was studied using x-ray photoelectron spectroscopy. The result showed that after mechanical alloying, nanocrystalline β-Ti (BCC) and α-Ti (HCP) solid solutions were formed with crystallite sizes of 7.2 nm and 22.7 nm, respectively. The microstructure of the sintered Ti20Nb20Zr alloy consists of a β-Ti region with ultra-fine grains of α-Ti at the grain boundary. Surface analysis revealed that protective oxides of TiO2, Ti2O 3, ZrO2, and Nb2O5 were formed. The developed alloy showed enhanced wettability compared with commercial Ti-6Al-4V alloys.
      PubDate: 2022-01-25
       
  • Extraction Separation of Ti(IV) and Fe(II) Using D2EHPA from the Raffinate
           Obtained After Extraction of Scandium from Titanium Dioxide Waste Acid

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      Abstract: The raffinate obtained after extracting scandium from titanium dioxide waste acid (hereafter, waste acid-A) contains a lot of valuable components. The extraction separation process of Ti(IV) and Fe(II) from the raffinate using a D2EHPA-sulfonated kerosene extraction system was studied under different conditions. The results showed that the Ti(IV) extraction rate was 100% with 1.66% Fe(II) co-extracted using 30% D2EHPA with an O/A rate of 1:2 at 30°C for 20 min in a two-stage countercurrent test. Then, the extracted Ti(IV) was stripped with NH4HF2 solution. Under the optimal conditions, all the Ti(IV) was stripped, together with the stripping of 14.52% Fe(II). Moreover, the reaction mechanism of Ti(IV) with D2EHPA in sulfuric acid medium was determined using the results of the saturation capacity method and FT-IR analysis. Ti(IV) was extracted in the form of (TiO)2A6H2. Finally, a conceptual flow chart for recovering relatively high-purity titanium from the raffinate has been innovatively proposed.
      PubDate: 2022-01-25
       
  • Computational Evaluation of Flow-Induced Abrasion of Blade and Ladle in
           Kanbara Reactors for Hot Metal Desulfurization

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      Abstract: The impeller blades in Kanbara reactors for hot metal desulfurization often fail due to extreme erosion induced by the hot metal. Computer simulation has made it possible to evaluate the degree of abrasion and predict wear locations. In this work, a numerical model coupled with the erosion formula was used to quantitatively assess the shear stress and abrasion rate. Based on the simulation results, nonuniform local erosive wear was identified, showing that the zones of high erosion concentrated at the lower part of the blade and along two rings of the ladle lining. The impeller immersion depth has a negligible influence on the blade abrasion but remarkably affects the ladle sidewall and bottom. The quantitative correlations of abrasion rate as a function of blade dimension and rotation speed were obtained. The results can be used to identify the erosion problems and optimize impeller design and operation to extend the service life of both the impeller and the ladle.
      PubDate: 2022-01-25
       
  • Reduction and Melting Behavior of Pre-reduction Metallized Carbon-Bearing
           Pellets in Iron Bath Smelting Reduction Furnace

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      Abstract: Because of the problems associated with pulverized charge in rotary kilns of the rotary kiln pre-reduction and bath smelting process, we proposed that the pulverized charge was granulated moderately to produce carbon-bearing pellets, and the particle size range was limited. In this work, we mainly investigated the effect of smelting temperature and smelting time on the reduction and melting separation of the pellets. The results indicated that the pellets could achieve a high metallization ratio and favorable separation when the proportion of the pellets with particle size of 2–5 mm was more than 60%, the smelting temperature was 1500–1550°C, and the smelting time was 160–200 s. This moderate granulation of the pulverized charge is effective in reducing energy consumption and increasing production efficiency of the process when the range of particle sizes of the pellets is controlled.
      PubDate: 2022-01-25
       
  • Reuse of Electric Arc Furnace Slag as Filler for Nitrile Butadiene Rubber

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      Abstract: This work shows an innovative application for electric arc furnace (EAF) slag: its use as a filler for nitrile butadiene rubber (NBR). Composites with various EAF slag contents were tested. It was found that the polymer matrix significantly reduces the leaching of slag (determined according to the standard CEN-EN 12457-2) incorporated in the NBR. The processability characteristics determined by the rheometric curves highlight that the EAF slag accelerates the crosslinking kinetics, reducing the production cycle time. Mechanical characterization demonstrated that EAF slag increases hardness and compression modulus. The ability to recover an imposed deformation quantified by the compression set is reduced as the EAF slag amount increases but remains below an acceptable value. It can be stated that in sealing systems, the EAF slag as a filler for NBR positively affects the compound properties. Moreover, NBR filled with EAF slag also has magnetic properties compared with standard rubber.
      PubDate: 2022-01-25
       
  • The CFD Modeling of Multiphase Flow in an SKS Furnace: The Effect of
           Tuyere Diameter and Bath Depth

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      Abstract: CFD simulation using a multi-fluid VOF model on scaled-down SKS furnace multiphase flow was conducted, targeting the agitation performance under conditions of different tuyere diameters and bath depths, at a constant total gas volumetric flow rate. The results indicate that an increased bath depth contributes to the lateral movements of the matte and air phased, significantly promoting the agitation at the far side of the plumes. The characteristic of a deep bath allows larger tuyere diameters operated at a lower gas injection speed, to achieve comparatively smaller low velocity regions and dead zones. In addition, the wall shear stress was found to correlate with the distribution of low-velocity regions. Since the selections of tuyere diameter and bath depth are of major importance in the optimizing of flow fields, the results from this simulation offer good references for the future operation and design of SKS furnaces and other similar industrial vessels.
      PubDate: 2022-01-25
       
  • Low-Temperature Microwave Carbothermic Reduction Roasting of Antimony
           Sulfide Concentrate Based on the Dielectric Properties

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      Abstract: Here, we propose a clean one-step microwave carbothermic reduction process for direct reduction of antimony sulfide concentrate to metallic antimony using ZnO as the sulfur-fixing agent and carbon powder as the reducing agent. Analysis of the thermodynamics and dielectric properties theoretically verified the feasibility of preparation of metallic antimony by rapidly reducing antimony sulfide by microwaves. Preliminary reduction experiments were performed in the temperature range 400–800 °C, and the roasted products were analyzed by x-ray diffraction and scanning electron microscopy/energy-dispersive spectroscopy. The experimental results indicated that the reduction course of antimony was Sb2S3 → Sb2O3 → Sb and sulfur was fixed in the form of ZnS. The optimum conditions were roasting temperature of 500°C, 1.5 times the amount of ZnO, 30% carbon powder, and roasting time of 90 min. Under the optimized conditions, the recovery rate and sulfur fixation were 90.1% and 95.3%, respectively.
      PubDate: 2022-01-25
       
  • Effect of Temperature on the Oxidation Behavior of Al and Ti in Inconel®
           718 Alloy by ESR Slag with Different Amounts of CaO

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      Abstract: It is necessary to reduce the amount of CaF2 in the electroslag remelting (ESR) slag because it causes a high specific energy consumption and several environmental problems. Laboratory-scale experiments were performed to study the effect of temperature on the oxidation behavior of Al and Ti in Inconel® 718 alloy by the CaF2-CaO-Al2O3-MgO-TiO2 slag containing different amounts of CaO. The oxidation loss of Al in the nickel-based alloy can be restrained by increasing the amount of CaO up to about 10 wt.% in the slag at 1873 K. However, an excessive amount of CaO in the slag will result in the oxidation of Ti when TiO2 content is less than 15 wt.%. The slag containing 35 wt.% CaO and 15 wt.% TiO2 can maintain a homogeneous distribution of Al and Ti in the remelted ingot in the ESR process. The corresponding usage amount of CaF2 was decreased, which was beneficial for decreasing specific energy consumption and fluoride pollution during the ESR process.
      PubDate: 2022-01-25
       
  • The Potential of Machine Learning for Enhancing CO2 Sequestration,
           Storage, Transportation, and Utilization-based Processes: A Brief
           Perspective

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      Abstract: In the paper, we present a review of different types of CO2 capture, storage, transportation, and utilization (CCSTU) processes. We have also reviewed their further development by using machine learning (ML) methods. Some examples of carbon capture or separation technologies (CCT) are absorption, adsorption, membranes, chemical looping, pyrogenic carbon capture and storage (PyCCS), hydrates, and mineral sequestration, which we review here. We have also classified hybrid processes where multiple methods can be synergistically used for CO2 capture and utilization. ML methods have also been successfully utilized in CCSTU to enhance the efficiency of CCSTU by process optimization and incorporating new materials design. Based on the review, we have outlined some recommendations for future research, namely consideration of the carbon impact of AI-driven models, and more interactions among ML experts, experimentalists, and computational modelers, which will lead to a holistic approach rather than a competing attitude for rapid commercialization of low-carbon technologies. We also give examples of databases for future research.
      PubDate: 2022-01-24
       
  • Electroreduction of Antimony Sulfide Enhanced by Nitrogen Bottom Blowing
           in Molten NaCl-KCl-Na2S

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      Abstract: This work proposes a novel nitrogen bottom-blowing method to enhance mass transfer in the molten salt electrolysis process, improve current efficiency, and reduce electrolysis energy consumption. The effect of nitrogen agitation on the dissolution of Sb2S3 and Sb was studied. The effects of nitrogen flow rate, electrolytic temperature, cell voltage, and pole spacing on the distribution behavior of Sb during constant piezoelectric reduction were investigated. The results show that nitrogen agitation can obviously accelerate the dissolution of Sb2S3. The current efficiency of the cathode reaches 92.76%, the energy consumption is 1.78 kWh kg−1, and the grade of crude antimony is 98.5%. Compared to no nitrogen stirring, electrolytic current efficiency is improved by 19.87% and the energy consumption is saved by 20.89%. Furthermore, the appropriate flow rate of nitrogen accelerates the removal of sulfur from the reactor and avoids the formation of high-priced antimony compounds.
      PubDate: 2022-01-24
       
  • Atomistic Insight into the Texture Weakening and Shear-Shuffle Twinning
           Mechanism During Cold-Rolling of Magnesium

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      Abstract: Basal texture weakening and twinning are two important mechanisms causing enhancement in the formability of nanocrystalline magnesium. However, the atomistic perspective of these mechanisms along with structural evolution during the rolling process is unexplored. Here, we have implemented molecular dynamics simulations and modeled the cold-rolling process to study the dynamic twin nucleation through atomic shuffling and texture weakening mechanisms under the influence of compressive loads. Results show that twinning propagates along the grains under shear stress through twin boundary disconnection steps, whereas successive thickness reduction through multiple passes causes an overall texture weakening due to the RD splitting of basal orientation. Along with this, grain refinement is also found to contribute towards texture weakening. The findings of this work comply well with the experimental results and we hope that it can aid in demystifying the enigma related to structural evolution in nanostructured HCP metals during the rolling process.
      PubDate: 2022-01-21
       
  • Post-Processing Framework for As-Built LPBF Ti-6Al-4V Parts Towards
           Meeting Industry Functional Requirements

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      Abstract: Although metal additive manufacturing (MAM) technologies such as laser powder bed fusion (LPBF) are finding applications in aerospace industries, the as-built part properties are not consistently meeting the required functional requirements. As such, this study aims to develop a general qualification strategy and an overview of a conceptual post-processing framework to qualify LPBF parts for aerospace applications. The approach was to use data obtained from published journals and standards, which were organized into three data sets. The current understanding from the three data sets was used to develop the post-processing framework as applied to a Ti-6Al-4V aerospace component. The novelty of this article is two-fold. First, four fundamental attributes to structural integrity are collectively presented into one framework. Second, a clear step-by-step guideline is provided to easily identify relevant options on how each attribute should be qualified for industry application.
      PubDate: 2022-01-21
       
  • A Method for Predicting Powder Flowability for Selective Laser Sintering

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      Abstract: This work investigates a method for pre-screening material systems for selective laser sintering using a combination of revolution powder analysis (RPA) and machine learning. To develop this method, nylon was mixed with alumina or carbon fibers in different wt.% to form material systems with varying flowability. The materials were measured in a custom RPA device and the results compared with as-spread layer density and surface roughness. Machine learning was used to attempt classification of all powders for each method. Ultimately, it was found that the RPA method is able to reliably classify powders based on their flowability, but as-spread layer density and surface roughness were not able to be classified.
      PubDate: 2022-01-21
       
  • Preliminary Study on Machining of Additively Manufactured Ti-6Al-4V

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      Abstract: Additively manufactured metals differ from their conventionally produced counterparts due to the inherent material inhomogeneity, porosity, and thermal stress induced by the process. These differences make the machining of additively manufactured metals more difficult and cause premature tool failure or unexpected surface finish at certain conditions. This study takes the first step to investigate and identify the causes of these issues, particularly for Ti-6Al-4V. Printed and wrought samples, as well as heat treatment effect, are compared in a dry cutting condition at a cutting speed of 90 m/min in terms of cutting power, vibration, temperature, and produced surface finish. The results show a lower cutting power and more vibration for as-printed Ti samples, indicating a less ductile microstructure and inclusion of pores. Heat treatment can eliminate these phenomena. No significant difference is found in the produced surface finish at the current cutting condition.
      PubDate: 2022-01-21
       
  • Synthesis and Characterization of CeO2, Gr and rGO Nanocomposites at
           Different Temperature

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      Abstract: Novel cerium oxide (CeO2) nanoparticles (NPs), CeO2-Gr and CeO2-rGO nanocomposites with graphite (Gr), and different degrees (100°C, 300°C, and 500°C) of reduced graphene oxide (rGO) have been synthesized via a one-pot hydrothermal process in the presence of cetyltrimethylammonium bromide and aqueous ammonia. The obtained crystalline size of the CeO2 NPs was 27.19 nm from the XRD analysis, and this decreased to 10.46 nm in CeO2-rGO500. FTIR spectroscopy confirmed the presence of hydroxyl, carboxyl, and epoxy functional groups in the layers of the obtained nanocomposites. TGA/DSC analysis revealed attached CeO2 NPs over graphite and different degrees of rGO nanomaterials. The atomic concentrations of C1s, O1s, and Ce3d in prepared nanocomposites were 29.92%, 52.65%, and 17.43%, respectively. Huge enhancement was achieved for the CeO2-rGO500 nanocomposite in the atomic concentration of C1s (66.55%) and Ce3d (27.28%). The anchoring CeO2 nanocrystal on the rGO lattice structure dispersed uniformly and prevented the agglomeration over the thin film of carbon atoms, also enhancing the physicochemical properties, such as electric, thermal, morphology, and redox. However, the structural and physiochemical behavior of CeO2 NPs, CeO2-Gr, and CeO2-rGO nanocomposite materials is still controversial.
      PubDate: 2022-01-21
       
 
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