Materials Research-ibero-american Journal of Materials最新文献_第9页

A New Two-Step Method for Laser Cladding of Silicon Carbide in Wc-Co Substrates Wc-Co衬底激光熔覆碳化硅的两步法

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-06 DOI: 10.1590/1980-5373-mr-2022-0195

R. M. Volú, K. Zilnyk, S. Dyer, C. Santos, J. Jakutis Neto, G. Vasconcelos

{"title":"A New Two-Step Method for Laser Cladding of Silicon Carbide in Wc-Co Substrates","authors":"R. M. Volú, K. Zilnyk, S. Dyer, C. Santos, J. Jakutis Neto, G. Vasconcelos","doi":"10.1590/1980-5373-mr-2022-0195","DOIUrl":"https://doi.org/10.1590/1980-5373-mr-2022-0195","url":null,"abstract":"WC-Co cutting tools are widely used by the metalworking industry. In order to improve the properties of these tools, research on the application of wear-resistant coatings, such as polycrystalline diamond, are of great importance to several applications. It is known that the occurrence of high-stress levels between the coating and the substrate can lead to adhesion failures. One strategy to minimize these failures is applying an intermediate layer of SiC. In this work, the deposition of a SiC layer was carried out by a novel two-step laser cladding approach. Instead of cladding directly the pre-synthesized SiC on the substrates, a 200 µm silicon powder layer was pre-deposited on the WC-Co substrates and then irradiated with a 30 W CO 2 laser. To improve metallurgical bonding between the tungsten and the Si layer, all substrates were chemically attacked. This attack allows cobalt removal from the surface and increases surface roughness, improving the laser cladding process. After the SiC laser cladding, samples were coated with a 200 µm graphite powder layer and irradiated again by a CO 2 laser. The samples were characterized by SEM, EDS, and XRD analysis. The results showed that in the first step, an irradiation energy of about 0.27 J was enough to fuse the silicon powder to the substrate and in the second step, 0.13 J was enough to promote the reaction between silicon, carbon and the WC substrate, resulting in the in-situ synthesis of SiC. Finally, a new method was proposed for the deposition of SiC on WC-Co based substrates and the observed results allowed the proposal of an empirical equation to describe the chemical reactions of the process.","PeriodicalId":18331,"journal":{"name":"Materials Research-ibero-american Journal of Materials","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67301312","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

Combined Experimental and First Principles Study on Nanostructured NbFeSb Half-Heusler Alloy Synthesized by Mechanical Alloying 机械合金化合成纳米结构NbFeSb半heusler合金的实验与第一性原理相结合研究

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-06 DOI: 10.1590/1980-5373-mr-2022-0295

Cleverton Oliveira Dias, J. Monteiro, Leonardo Oliveira, P. Chaudhuri, S. M. Souza, D. M. Trichês

{"title":"Combined Experimental and First Principles Study on Nanostructured NbFeSb Half-Heusler Alloy Synthesized by Mechanical Alloying","authors":"Cleverton Oliveira Dias, J. Monteiro, Leonardo Oliveira, P. Chaudhuri, S. M. Souza, D. M. Trichês","doi":"10.1590/1980-5373-mr-2022-0295","DOIUrl":"https://doi.org/10.1590/1980-5373-mr-2022-0295","url":null,"abstract":"The Half-Heusler semiconductor alloys can be used efficiently as thermoelectric materials to transform the waste heat into useful electrical energy. The low-cost and large-scale production of suitable half-Heusler alloys are important in the present context. In this work, a nanostructured half-Heusler NbFeSb alloy is obtained by mechanical alloying with 15h of milling. The structural parameters of the sample are investigated by powder X-ray diffraction followed by Rietveld refinement. Differential scanning calorimetry indicates that the NbFeSb phase is stable up to about 420 K. The electrical resistivity is obtained as a function of temperature. A band gap of 0.37(3) eV is obtained from UV-Vis measurements. Density functional theory calculation shows an indirect band gap of 0.52 eV. Analyses of the obtained data indicate that structural defects and nanometric crystallites sizes present in the nanostructured NbFeSb produced by mechanical alloying do not degrade the electrical and optical properties of the compound.","PeriodicalId":18331,"journal":{"name":"Materials Research-ibero-american Journal of Materials","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67301682","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

Hydroxylation Studies on High-Solid Load Magnesia Aqueous Suspensions 高固载氧化镁水溶液悬浮液的羟基化研究

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-06 DOI: 10.1590/1980-5373-mr-2022-0329

R. Salomão, L. Fernandes

{"title":"Hydroxylation Studies on High-Solid Load Magnesia Aqueous Suspensions","authors":"R. Salomão, L. Fernandes","doi":"10.1590/1980-5373-mr-2022-0329","DOIUrl":"https://doi.org/10.1590/1980-5373-mr-2022-0329","url":null,"abstract":"The magnesia (MgO) hydroxylation behavior in dilute suspensions (below 50% volumetric solid loads) has been extensively studied over the past decades due to its role in refractory castables. However, its equivalent effects on concentrated systems have not been analyzed in such a systemic way, although they are known to be as or more deleterious than those observed in dilute systems. This study focuses on the hydroxylation behavior of different sources of magnesia (sinter and caustic magnesia) in aqueous suspensions prepared at various solids concentrations (17-96 vol%) and shaped by distinct methods. They were analyzed by thermogravimetry, apparent volumetric expansion measurements, X-ray diffraction, scanning electron microscopy, and in situ temperature measurements during curing. The ratio between experimental and theoretical extents of the hydroxylation degree resulted in the reaction yield. A comparison between samples containing the same water amount revealed those with caustic magnesia showed a faster evolution of hydroxylation degree, apparent volumetric expansion, and higher maximum internal temperature during curing. In both systems, the yield levels of compositions of heavier solid loads were higher, despite the small quantity of hydroxylation products formed. Significant differences in the products’ microstructure were observed and related to the ions’ mobility toward crystallization nuclei.","PeriodicalId":18331,"journal":{"name":"Materials Research-ibero-american Journal of Materials","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67302077","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

CuO and Ce-doped CuO Prepared by Microwave Hidrotermal Method in Photodegradation of Remazol Golden Yellow Dye 微波湿热法制备CuO及ce掺杂CuO光降解雷马唑金黄色染料

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-06 DOI: 10.1590/1980-5373-mr-2022-0300

M. R. Quirino, G. L. Lucena, Renata Júlia Cordeiro de Araújo, Adriano Ribeiro da Silva, Anely Maciel de Melo, I. Santos, L. Gama

引用次数: 1

Study on Mechanical Properties and Failure Mechanism of Medium Manganese TRIP Steel / DP590 Dissimilar Steel Resistance Spot Welding Joint 中锰TRIP钢/ DP590异种钢电阻点焊接头力学性能及失效机理研究

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-06 DOI: 10.1590/1980-5373-mr-2022-0373

Hongning Liu, Yunming Zhu, Yifeng Tian, Fufa Wei, Yongqiang Zhou, Zhengqiang Zhu

引用次数: 0

Experimental Investigation on the Effect of Stacking Sequence on Damage Resistance and Post-indentation Performance of Glass/Epoxy Laminates Under Different Loading Planes Using Acoustic Emission Monitoring 基于声发射监测的不同加载平面下堆叠顺序对玻璃/环氧复合材料抗损伤性能和压痕后性能影响的实验研究

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-01 DOI: 10.1590/1980-5373-mr-2022-0325

A. Bharathi, V. Arumugam, C. S. Kumar

引用次数: 1

Recycling of Firewood Ash Waste in Ceramic Floor Tiles with Low Water Absorption 低吸水陶瓷地砖中柴火灰渣的回收利用

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-01 DOI: 10.1590/1980-5373-mr-2022-0543

Fernanda Gomes, J. Holanda

引用次数: 0

Copper Binary and Ternary Alloys as Anticorrosive Coatings for Carbon Steel in a Saline Medium 铜二元和三元合金作为碳钢在盐水介质中的防腐涂层

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-01 DOI: 10.1590/1980-5373-mr-2023-0076

T. M. D. Souza, Gustavo Dionisio Mesquita, Bruno S. M. Loureiro, Lucas Ferreira da Silva Dias, D. C. B. Lago, L. Senna

引用次数: 0

Influence of Surface Treatment on The Mechanical and Viscoelastic Properties of Adhesive Joints Applied to The Oil and Gas Industry 表面处理对石油和天然气工业用粘接接头力学和粘弹性的影响

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-01 DOI: 10.1590/1980-5373-mr-2023-0025

C. E. Moraes, L. Santos, T. Leal, E. Botelho, M. Costa

引用次数: 0

Effect of the Heating Rate and Processing Time on Grain Growth of Hematite Nanopowders in Conventional and Microwave-Assisted Sintering 加热速率和加工时间对传统和微波辅助烧结纳米赤铁矿粉晶粒生长的影响

IF 1.7 4区材料科学

Materials Research-ibero-american Journal of Materials Pub Date : 2023-01-01 DOI: 10.1590/1980-5373-mr-2023-0058

Marina Magro Togashi, C. Perdomo, R. Kiminami

{"title":"Effect of the Heating Rate and Processing Time on Grain Growth of Hematite Nanopowders in Conventional and Microwave-Assisted Sintering","authors":"Marina Magro Togashi, C. Perdomo, R. Kiminami","doi":"10.1590/1980-5373-mr-2023-0058","DOIUrl":"https://doi.org/10.1590/1980-5373-mr-2023-0058","url":null,"abstract":"Microwave-assisted sintering of ceramic materials has proven to be a very favorable processing technique that can promote lower grain growth and densification with shorter dwell times. Hematite is considered a good microwave absorber due to its high loss tangent value, calculated in the range of 0.001 to 0.2 between room temperature and 750 ºC for 2.45 GHz 1 , thus showing good interaction with this electromagnetic radiation. However, there are few studies on grain growth kinetics of hematite during microwave sintering, as well as the relationship with grain growth parameters. Therefore, the aim of this work was to evaluate the effect of the heating rate and dwell time on grain growth kinetics, during microwave-assisted sintering (2.45 GHz) of hematite nanopowders. In an initial characterization, dilatometry tests were performed by conventional heating and microwave-assisted heating using the same heating rate (20 °C/min). From these results, the temperature ranges of the initial and intermediate stages of sintering and the onset of linear shrinkage were determined. Considering these results, the samples were sintered in a conventional oven from 750 ºC to 1200 ºC with increments of 50 ºC, varying the dwell time in 6, 12 and 36 minutes. Thus, the diffusional mechanism (N) could be calculated, a value used for the approximate calculation of microwave sintering kinetics. Additionally, sintering was performed in a microwave oven using three heating rates (20, 30 and 50 °C/min) to evaluate the effect of the heating rate on grain growth. The estimated activation energies for the grain growth process during microwave sintering were approximately 237.5 to 272.3kJ/mol, which were higher compared to conventional sintering, in the range of 206.0 to 242.0 kJ /mol. It was found that with increasing microwave heating rate, the activation energy for grain growth tends to be higher.","PeriodicalId":18331,"journal":{"name":"Materials Research-ibero-american Journal of Materials","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67304550","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