Science of Sintering最新文献_第9页

Structural and luminescence properties of SrGd2O4 nanocrystalline phosphor doped with Dy3+ and Sm3+ 掺杂Dy3+和Sm3+的SrGd2O4纳米晶荧光粉的结构和发光性能

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2203295s

Tijana Stamenković, Nadežda Radmilović, M. Nikolic, Jelena Erčić, V. Lojpur

{"title":"Structural and luminescence properties of SrGd2O4 nanocrystalline phosphor doped with Dy3+ and Sm3+","authors":"Tijana Stamenković, Nadežda Radmilović, M. Nikolic, Jelena Erčić, V. Lojpur","doi":"10.2298/sos2203295s","DOIUrl":"https://doi.org/10.2298/sos2203295s","url":null,"abstract":"In this manuscript, down-conversion nanopowders of SrGd2O4 doped with different concentrations of either Dy3+ or Sm3+ ions were examined in detail. All samples were prepared via glycine-assisted combustion method, primarily burned at 500?C for 1.5 h and additionally calcined at 1000?C for 2 h, at ambient room temperature. The XRD analysis showed that all samples crystallize as single phase and the orthorhombic lattice SrGd2O4. TEM analysis determined high degree of crystallinity of samples with grain size of approximately 200 nm for Dy3+ doped and 150 nm for Sm3+ doped SrGd2O4. For both samples SAED confirmed that diffraction rings correspond to the hkl plane indices of SrGd2O4, while EDS confirmed presence of Dy in crystal structure. Results of luminescent characterization demonstrated all appropriate emission peaks related to either Dy3+ or Sm3+ dopant ions. Investigation of dopant concentration revealed that the lowest values of both dopants have the most prominent emission peaks, while coordinates obtained from the CIE diagram showed emission shifting with the change of concentration.","PeriodicalId":21592,"journal":{"name":"Science of Sintering","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68809083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Removal of the As(V) and Sr(VI) from the water using magnetite/3D-printed wollastonite hybrid adsorbent 使用磁铁矿/ 3d打印硅灰石混合吸附剂去除水中的As(V)和Sr(VI)

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2201105p

Mina Popovic, Z. Veličković, J. Bogdanov, A. Marinković, M. Casas-Luna, Isaak Trajković, N. Obradović, V. Pavlović

{"title":"Removal of the As(V) and Sr(VI) from the water using magnetite/3D-printed wollastonite hybrid adsorbent","authors":"Mina Popovic, Z. Veličković, J. Bogdanov, A. Marinković, M. Casas-Luna, Isaak Trajković, N. Obradović, V. Pavlović","doi":"10.2298/sos2201105p","DOIUrl":"https://doi.org/10.2298/sos2201105p","url":null,"abstract":"In this study, the structure, morphology and composition of the synthesized magnetite/3D-printed wollastonite (3D_W/M) composite were characterized, and its adsorption performance with respect to As(V) and Cr(VI) were studied. Magnetite (MG) modified 3D printed wollastonite was obtained by two step procedure: modification of 3D_W with 3-aminoproylsilane (APTES) followed by controlled magnetite (MG) deposition to obtain 3D_W/M adsorbent. The structure/properties of 3D_W/M were confirmed by applying FTIR, XRD, TGD/DTA, and SEM analysis. The adsorption properties of hybrid adsorbents were carried out for As(V) and Cr(VI) removal - one relative to the initial pH value, the adsorbent mass, the temperature, and the adsorption time. Time-dependent adsorption study was best described by pseudo-second order equation, while Weber Morris analysis showed that intraparticle diffusion controled diffusional transport. Similar activation energy, 17.44 and 14.49 kJ?mol-1 for adsorption As(V) and Cr(VI) on 3D_W/M, respectively, indicated main contribution of physical adsorption. Determination of adsorption parameters was performed by applying different adsorption isotherm models, and the best fit was obtained using Freundlich model. The adsorption capacity of 24.16 and 29.6 mg g-1 for As(V) and Cr(VI) at 2?C, Co = 5.5 and 5.3 mg L-1, respectively, were obtained. Thermodynamic study indicated favourable process at a higher temperature. Preliminary fixed-bed column study and results fitting with Bohart-Adams, Yoon-Nelson, Thomas, and Modified dose-response model showed good agreement with results from the batch study.","PeriodicalId":21592,"journal":{"name":"Science of Sintering","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68808720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Microstructure and mechanical properties of aluminium matrix boron carbide and carbon nanofiber reinforced hybrid composites 铝基碳化硼与纳米碳纤维增强混杂复合材料的组织与力学性能

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2202125o

Faik Okay, S. Islak

{"title":"Microstructure and mechanical properties of aluminium matrix boron carbide and carbon nanofiber reinforced hybrid composites","authors":"Faik Okay, S. Islak","doi":"10.2298/sos2202125o","DOIUrl":"https://doi.org/10.2298/sos2202125o","url":null,"abstract":"In this study, aluminium matrix boron carbide (B4C) and carbon nanofiber (CNF) reinforced hybrid composite was produced by powder metallurgy method and their microstructure and mechanical properties were investigated. The samples were produced at 6 percentage volume ratios using hot pressing technique. Microstructure examination, hardness measurement, transverse rupture test, and wear tests were carried out in order to determine the mechanical properties of the samples. Also three-point bending test was performed to determine their transverse rupture strength (TRS). Wear tests were carried out based on the ball on disc method. The microstructure examination revealed that the reinforcing elements were relatively homogeneously distributed in the aluminium matrix. In addition, the fracture was brittle due to the notch effect and agglomeration occurred with increasing amount of CNF. As the CNF amount of the samples increased, their hardness values increased but their TRS values decreased. Results of the wear test indicate that the increased amount of CNF increased the wear resistance. The friction coefficient values of the samples varied between 0.535 and 0.646. When the hardness was examined together with TRS and wear test results, the most suitable sample was determined to be Al-7%B4C-1%CNF","PeriodicalId":21592,"journal":{"name":"Science of Sintering","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68808765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the optical and electrical characteristics of CuO/CuCo2O4 composites CuO/CuCo2O4复合材料的光学和电学特性研究

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2203265d

N. Deraz, H. Saleh, A. Abdel-karim

引用次数: 1

Powder metallurgy and hardness of the Ll-10Mg alloy reinforced with carbon nanotubes 碳纳米管增强l- 10mg合金的粉末冶金及硬度

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2204387s

J. Sánchez-Cuevas, G. Rosas, O. Navarro, C. Mercado-Zúñiga, L. Bretado-Aragón, F. Reynoso-Marín, J. Zárate-Medina

{"title":"Powder metallurgy and hardness of the Ll-10Mg alloy reinforced with carbon nanotubes","authors":"J. Sánchez-Cuevas, G. Rosas, O. Navarro, C. Mercado-Zúñiga, L. Bretado-Aragón, F. Reynoso-Marín, J. Zárate-Medina","doi":"10.2298/sos2204387s","DOIUrl":"https://doi.org/10.2298/sos2204387s","url":null,"abstract":"In this work, the multi-walled carbon nanotubes (MWCNTs) were purified with an acid treatment and subsequently dispersed using ultrasound and a nonionic surfactant solution of ethoxylated lauric alcohol 7 moles of ethylene oxide (E7E). Then, carbon nanotubes (CNTs) were used as a reinforcement phase (0.4 wt.% and 0.8 wt.%) in the Al- 10Mg alloy. The high-energy ball milling was employed for the nanocomposites processing, and the resulting powders consolidate by uniaxial pressure. Measurements of Vickers microhardness, nanohardness, displacement, and Young's modulus were carried out on the compacts. The samples were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis), Fourier-transform infrared spectroscopy (FT-IR), and Raman spectroscopy (RS). Good dispersion of MWCNTs was achieved using 0.5 mg/ml of the E7E surfactant. The CNTs were dispersed in the Al-10Mg matrix using 0.25 h of milling. After powders compaction, the Al-10Mg/0.4MWCNTs nanocomposite presented a microhardness of 190 HV, nanohardness of 3.5 GPa, and Young's modulus 116 GPa.","PeriodicalId":21592,"journal":{"name":"Science of Sintering","volume":"595 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68809570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fourier-transform infrared spectroscopy analysis of mechanochemical transformation kinetics of sodium carbonate to bicarbonate 碳酸钠向碳酸氢盐的机械化学转化动力学的傅里叶变换红外光谱分析

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2204481d

N. Djordjevic, M. Vlahović, Slavica Mihajlović, Sanja Martinović, Nenad Vušović, Jasmina Lozanović-Šajić

引用次数: 0

Investigation of the microstructure-hardness and wear performances of hybrid/composite materials Al2O3/SiC particle reinforced in AA 7075 matrix AA 7075基体中Al2O3/SiC颗粒增强杂化/复合材料显微组织、硬度及磨损性能研究

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2202177o

Zübeyde Özkan, Hakan Gökmeşe, U. Gökmen

{"title":"Investigation of the microstructure-hardness and wear performances of hybrid/composite materials Al2O3/SiC particle reinforced in AA 7075 matrix","authors":"Zübeyde Özkan, Hakan Gökmeşe, U. Gökmen","doi":"10.2298/sos2202177o","DOIUrl":"https://doi.org/10.2298/sos2202177o","url":null,"abstract":"As a result of advances in science and technology, the importance of metal matrix composite materials is increasing gradually today. However, in many studies, composite production is carried out with monotype ceramic particle reinforcement. In this study, the production, microstructure-hardness, and wear performance of composite-hybrid materials that had AA 7075 aluminum powder metal matrix and were reinforced by SiC and Al2O3 ceramic particles at different ratios were examined. The prepared Matrix and reinforcement powder mixtures were mixed for half an hour in the three-axis Turbula T2F type mixer and then, pressed unidirectionally and cylindrically under the pressure of 700 MPa. The pressed samples were sintered for 1 h at a temperature of 600oC in the argon atmosphere. Microstructure examinations were carried out using SEM (Scanning Electron Microscope) and optical microscope devices, while hardness measurements were obtained as a result of Brinell measurement. Wear performance of the test samples were tested in the Pin-on-disk type device at 10 N load and 500 rpm rotation speed by depending on the wear distances at 1000, 1500 and 2000 m. It was observed that hardness increased as the amount of ceramic particle in composite-hybrid samples increased. As a result of wear tests, in hybrid composites, compared to single-phase ceramic particle reinforced composites, weight losses increased depending on the increase in the reinforcement amount.","PeriodicalId":21592,"journal":{"name":"Science of Sintering","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68809053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dielectric properties of mechanically activated strontium titanate ceramics 机械活化钛酸锶陶瓷的介电性能

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2204401z

J. Živojinović, D. Kosanović, V. Blagojević, V. Pavlović, N. Tadic, B. Vlahovic, V. Pavlović

引用次数: 1

Artificial neural network applied on sintered BaTiO3-ceramic density 人工神经网络在烧结batio3陶瓷密度上的应用

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2204425r

B. Randjelovic, S. Ribar, V. Mitić, Bojana Markovic, H. Fecht, B. Vlahovic

{"title":"Artificial neural network applied on sintered BaTiO3-ceramic density","authors":"B. Randjelovic, S. Ribar, V. Mitić, Bojana Markovic, H. Fecht, B. Vlahovic","doi":"10.2298/sos2204425r","DOIUrl":"https://doi.org/10.2298/sos2204425r","url":null,"abstract":"It is very important to determine microstructure parameters of consolidated ceramic samples, because it opens new frontiers for further microelectronics miniaturization and integrations. Therefore, controlling, predicting and designing the ceramic materials? properties are the objectives in ceramic materials consolidating process, within the science of sintering. In order to calculate the precise values of desired microstructure parameter at the level of the grains? coating layers based on the measurements on the bulk samples, we applied the artificial neural networks, as a powerful mathematical tool for mapping input-output data. Input signals are propagated forward, as well as the adjustable coefficients that contribute the calculated output signal, denoted as error, which is propagated backwards and replaced by examined parameter. In our previous research, we used neural networks to calculate different electrophysical parameters at the nano level of the grain boundary, like relative capacitance, breakdown voltage or tangent loss, and now we extend the research on sintered material?s density calculation. Errors on the network output were substituted by different consolidated samples density values measured on the bulk, thus enabling the calculation of precise material?s density values between the layers. We performed the neural network theoretical experiments for different number of neurons in hidden layers, according to experimental ceramics material?s density of ?=5.4x103[kg/m3], but it opens the possibility for neural networks application within other density values, as well.","PeriodicalId":21592,"journal":{"name":"Science of Sintering","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68809712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical properties of biomass-derived silica nanoparticles reinforced PMMA composite material 生物质源二氧化硅纳米颗粒增强PMMA复合材料的力学性能

IF 1.5 4区材料科学

Science of Sintering Pub Date : 2022-01-01 DOI: 10.2298/sos2202211v

M. Vuksanović, I. Mladenović, N. Tomić, M. Petrović, V. Radojević, A. Marinković, R. Jančić-Heinemann

引用次数: 3