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Preparation and Tribological Properties of a Superhydrophobic TB6 Titanium Alloy 超疏水TB6钛合金的制备及其摩擦学性能
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-26 DOI: 10.1590/1980-5373-mr-2022-0446
Jialiang Guo, Fang Wang, J. Liou, Yuhuai Liu
.
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引用次数: 0
The Effect of Al-Cu Co-Dopants on Morphology, Structure, and Optical Properties of ZnO Nanostructures Al-Cu共掺杂物对ZnO纳米结构形貌、结构和光学性能的影响
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-26 DOI: 10.1590/1980-5373-mr-2022-0499
I. Sugihartono, S. T. Tan, A. Arkundato, R. Fahdiran, I. Isnaeni, E. Handoko, S. Budi, A. Budi
.
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引用次数: 1
Fast and Green Hematite (α-Fe2O3) and Akaganeite (β-FeOOH) Synthesis Using a Microwave-Assisted Hydrothermal Process with Single Precursor and No Stabilizing Agent 单前驱体无稳定剂微波辅助水热法快速合成绿赤铁矿(α-Fe2O3)和赤铁矿(β-FeOOH
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-26 DOI: 10.1590/1980-5373-mr-2023-0016
P. A. F. Diniz, K. S. B. Cavalcante, Josiane Carneiro Souza, G. Marques, Fernanda Hellen de S. Santos, Fiama M. Cutrim, Raelma B. Henriques, Leonardo T. B. Mendonça, U. M. Nascimento
.
{"title":"Fast and Green Hematite (α-Fe2O3) and Akaganeite (β-FeOOH) Synthesis Using a Microwave-Assisted Hydrothermal Process with Single Precursor and No Stabilizing Agent","authors":"P. A. F. Diniz, K. S. B. Cavalcante, Josiane Carneiro Souza, G. Marques, Fernanda Hellen de S. Santos, Fiama M. Cutrim, Raelma B. Henriques, Leonardo T. B. Mendonça, U. M. Nascimento","doi":"10.1590/1980-5373-mr-2023-0016","DOIUrl":"https://doi.org/10.1590/1980-5373-mr-2023-0016","url":null,"abstract":".","PeriodicalId":18331,"journal":{"name":"Materials Research-ibero-american Journal of Materials","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67304260","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
Austenitizing Temperature Effects on the Martensitic Transformation and its Influence on Simulated Welding Residual Stresses in a Microalloyed-Steel 奥氏体化温度对微合金钢马氏体相变的影响及其对模拟焊接残余应力的影响
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-26 DOI: 10.1590/1980-5373-mr-2022-0624
Salvatore Giuliano Peixoto Tropia de Abreu, R. Porcaro, G. Faria, L. Godefroid, I. C. Pereira, S. D. D. Souza
This study focused on the effects of different peak (austenitizing) temperatures (T p ) over the martensite start temperature (M s ) and its influence on the final residual stresses after welding simulation. For this purpose, the expansion coefficients obtained through physical (dilatometric) simulations of a high-strength low-alloy steel were considered for three peak temperatures: 1300 °C, 1150 °C, and 920 °C and a cooling rate of 25 °C/s. Aiming at clarifying the physical phenomenon behind GTAW welding, one carried out nonlinear transient thermomechanical finite-element (FE) analyses to reconstitute the welding process and simulate the subsequent formation of residual stresses in the HAZ. Once the heat source simulation was calibrated, four material models were created, one for each T p , and a fourth model considering a constant expansion coefficient, without considering the martensite transformation for comparison. A Three-bar model was evaluated to isolate the effects of T p (M s ) in the residual stresses. A composite plate model was also considered, in which the sheet HAZ was subdivided according to the reached peak temperature, and the respective material models were applied. The results show the importance of martensite transformation on the welding-induced residual stress and a clear trend of decreasing tensions with lowering the T p , especially over HAZ.
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引用次数: 0
Electrical and Optical Properties of Poly(vinyl chloride)/ZnS Nanocomposites Exposed to Gamma Radiation γ辐射下聚氯乙烯/ZnS纳米复合材料的电学和光学性能
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-19 DOI: 10.1590/1980-5373-mr-2022-0308
Nara E. Guimarães, Érika R. B. Ximenes, Lindomar Avelino da Silva, R. F. Santos, E. S. Araújo, Kátia A. S. Aquino
Poly(vinyl chloride) (PVC) is considered one of the most versatile polymers due to its interaction with different additives. On the other hand, binary sulfides have wide applications as zinc sulfide (ZnS), one of the first discovered semiconductors. This study aims to synthesize a nanocomposite material containing nano ZnS in the PVC matrix with a surfactant as a compatibilizer agent to evaluate its optical and electrical properties when exposed to gamma radiation. Our results showed that adding ZnS at 0.5 wt% concentration in the PVC matrix promoted the system from insulating to the semiconductor material. Therefore, gamma radiation has played an important role in nanocomposites’ optical and electrical properties with changes in electrical and electrical conductivity, constant dielectric parts, refraction index, optical band gap, and Urbach energy. Thus, our study points to the development of nanocomposite material, semiconductors, and features useful for applications in flexible electronics or optical-electronic devices.
聚氯乙烯(PVC)被认为是最通用的聚合物之一,因为它与不同的添加剂相互作用。另一方面,二元硫化物作为最早发现的半导体之一的硫化锌(ZnS)具有广泛的应用。本研究旨在以表面活性剂为相容剂,在聚氯乙烯基体上合成含纳米ZnS的纳米复合材料,以评估其在伽马辐射下的光学和电学性能。结果表明,在PVC基体中加入0.5 wt%浓度的ZnS,可以促进体系从绝缘向半导体材料的转变。因此,伽马辐射在纳米复合材料的电导率、恒定介电部分、折射率、光学带隙和乌尔巴赫能等方面的变化对纳米复合材料的光学和电性能起着重要的作用。因此,我们的研究指出了纳米复合材料、半导体的发展,以及在柔性电子或光电器件中的应用。
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引用次数: 0
Density Functional Theory Study of Metal-Organic Frameworks for Enhancement of Photo-Anode Properties 金属-有机骨架增强光阳极性能的密度泛函理论研究
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-19 DOI: 10.1590/1980-5373-mr-2022-0468
D. Kafi, A. Ayyash, Younus Khalaf Jabur
The optoelectronic properties of dye zinc and titanium-based metal-organic framework (MOF) compounds with regard to their application as photo-anode material characterized in solar cells were investigated. Analyses of the optoelectronic properties were performed on the MOF single crystal unit cell with adsorbed dye to determine the electronic and optical properties of the relevant materials. The electronic and optical properties were predicted by density functional theory (DFT) calculations. The results show that the absorption of light occurs for the examined MoF compounds from the near UV to the (visible) blue spectral range, at optical band gap sizes from 2.8 eV up to 3.88 eV. Dye sensitization of MOF with eosin Y or crown ether gave additive UV-Vis spectra. An improvement in band gap or an improved electron injection could be archived as well. Moreover, the light absorption does not solely depend on the linkers used, but also from the metal atoms in the secondary building unit. The fluorescence of MOFs depends on the linker and especially on the linker coordination and their rotation relative to each other. The utilizations of MOFs and their derivatives as electrodes, photoactive materials, charge carriers and additives in different solar cells are highlighted.
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引用次数: 0
Numerical Prediction for the Effects of Welding Interpass Temperature on the Thermal History and Microstructure of Duplex Stainless Steels 焊接道间温度对双相不锈钢热历史和组织影响的数值预测
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-19 DOI: 10.1590/1980-5373-mr-2022-0529
C. R. Xavier, Horácio Guimarães Delgado Junior, Matheus Gomes Rebello, Raí Ramos Lisbôa, Ana Carolina Martins Silva, J. A. Castro
Numerical simulation was used to predict the thermal behavior and the resulting microstructure at the heat-affected zone (HAZ) of a 170 mm diameter and 3.5 mm thickness super duplex stainless steel (SDSS) UNS S32750 tube. In order to evaluate the thermal response from the model, a usual welding situation involving interpass temperature (IT) and its influence on the HAZ microstructure was exploited. Thus, two superimposed autogenous welding passes were simulated, the first clockwise with the tube in the room temperature and the second, counterclockwise, with the tube at the temperature of 250 o C. Even subjected to successive thermal cycles and high interpass temperature, the proportion and morphology of the phases at the HAZ and Fusion Zone (FZ) did not present significant differences when comparing the two welding passes. Meanwhile, nitrogen losses should be avoided during welding in order to obtain a balanced microstructure in DSS welds, contributing to guarantee satisfactory toughness in addition to resistance to pitting corrosion. The predictions from the simulation were validated by using experimental results obtained from the autogenous TIG (Tungsten Inert Gas) process.
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引用次数: 0
Deposition of Ti-Based Thin Films on AISI 1020 Steel Substrates Using the Cathodic Cage Plasma Deposition Technique 利用阴极笼等离子沉积技术在AISI 1020钢衬底上沉积ti基薄膜
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-15 DOI: 10.1590/1980-5373-mr-2022-0291
Raul Felipe Barros da Silva, W. Cardoso, L. C. Gontijo, Bruno Poubel Pimentel, P. R. P. Viana, A. Galdino
The automotive industry is one of the largest industrial segments in the world market. The exhaust system of motor vehicles is responsible for the emission and treatment of toxic gasses released by the engine. In this sense, the application of titanium on an AISI 1020 steel substrate was carried out by plasma deposition using a cathode cage. The aim of this research was to evaluate the application of this material in the exhaust system of motor vehicles. The samples were characterized by scanning electron microscopy (SEM), confocal microscopy (CM), microhardness tests and corrosion resistance tests. The samples exhibited a thin film with higher titanium content and hardness than the uncoated sample. The corrosion potential also increased and the current density was lower than the uncoated sample. The conclusion is that the deposition of thin titanium films on AISI 1020 steel with CCPD has the potential to produce thin films.
汽车工业是世界市场上最大的工业部门之一。机动车的排气系统负责排放和处理发动机释放的有毒气体。在这种意义上,钛在aisi1020钢衬底上的应用是通过阴极笼等离子沉积进行的。本研究的目的是评价该材料在机动车排气系统中的应用。通过扫描电镜(SEM)、共聚焦显微镜(CM)、显微硬度测试和耐腐蚀测试对样品进行了表征。与未涂覆的样品相比,涂覆后的样品呈现出钛含量更高、硬度更高的薄膜。腐蚀电位升高,电流密度低于未涂覆样品。结果表明,用CCPD在AISI 1020钢表面沉积薄钛膜具有制备薄膜的潜力。
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引用次数: 1
Processing Biodegradable Blends of Hemicellulose with Polyhydroxybutyrate and Poly (Lactic Acid) 半纤维素-聚羟基丁酸-聚乳酸可生物降解共混物的制备
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-08 DOI: 10.1590/1980-5373-mr-2022-0390
Ívia Maria Lourenço Mendes, Michaella Socorro Bruce Fialho, R. Leão, E. Silveira, S. Luz
The bottleneck of hemicellulose as a bio-based material is its processability and property drawbacks (softening and hydrophilicity). Thus, mixing other biopolymers can be an alternative. This article proposes blending hemicellulose (10−50 wt%) with polyhydroxybutyrate (PHB) and poly (lactic acid) (PLA), using acetic acid and chloroform as casting solvents to improve its processability and thermal properties. The materials were thermally (TGA – thermogravimetric analysis), chemically (FTIR – Fourier transformer infrared) and morphologically (SEM – scanning electron microscopy) characterized. Finally, a multicriteria decision analysis (MCDA) evaluated the materials’ properties to identify the optimum combination (casting solvent, biopolymer and hemicelluloses proportion) for producing an optimal blend. The MCDA established that the blend of hemicellulose:PHB (10:90 wt/wt) produced with acetic acid was optimum considering melting temperature and the crystallinity criteria. Moreover, higher hemicellulose concentration in the blends decreased the MCDA success rate, indicating the worst properties. PLA blends showed a higher degradation temperature than PHB. The PHB blends produced with acetic acid demonstrated improved properties when compared to chloroform, revealing its potential as a solvent.
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引用次数: 1
Investigations on Tribological Behaviour of ZK60A Mg alloy-TiN Composites Synthesized via Powder Metallurgy Technique 粉末冶金ZK60A镁合金- tin复合材料摩擦学性能研究
IF 1.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-05-08 DOI: 10.1590/1980-5373-mr-2022-0467
H. Saravanan, M. Ravichandran, Dhinakaran Veeman, S. Alagarsamy
.
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引用次数: 0
期刊
Materials Research-ibero-american Journal of Materials
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