International Journal of Materials Science and Applications最新文献_第7页

Effect of Microstructural Variation of a Martensitic Stainless Steel on High Temperature Degradation Behavior 马氏体不锈钢显微组织变化对高温降解行为的影响

International Journal of Materials Science and Applications Pub Date : 2021-01-01 DOI: 10.11648/j.ijmsa.20211006.11

Giselly Bandeira Gomes Dias De Lima, Marcio Roberto Da Rocha

{"title":"Effect of Microstructural Variation of a Martensitic Stainless Steel on High Temperature Degradation Behavior","authors":"Giselly Bandeira Gomes Dias De Lima, Marcio Roberto Da Rocha","doi":"10.11648/j.ijmsa.20211006.11","DOIUrl":"https://doi.org/10.11648/j.ijmsa.20211006.11","url":null,"abstract":": Martensitic stainless steels are chromium steels with a small addition of Ni. They have a good combination of mechanical properties and corrosion resistance, due to their Cr content [12]. The degradation processes are present in several industrial equipments and, generate repair or replacement actions in a periodic way. In an attempt to minimize these problems, several studies have been developed with this purpose. However, due to the several variables involved in the process, both in design and equipment operation, there is still a fertile field for an effective understanding of these degradation problems. For example, one can cite the effects that the different microstructures developed in martensitic stainless steels, materials commonly used in severe service conditions, present on the behavior of resistance to oxidation of the material. And, also, the environment in which the material is inserted. In a high-temperature environment, impurities are found, among them, compounds such as vanadium pentoxide, which act vigorously in the progression of the oxidation process. Oxidation tests are necessary to relate the behavior and influence exerted on the oxide layer by grain refinement. Thus, the present work aims to analyze the influence of the microstructure of the martensitic stainless steel AISI 420, with application of different treatments. The behavior of this steel was evaluated under different oxidation conditions, in contact with a solution containing Vanadium Pentoxide, and as a control parameter the mass variation of the samples. Analysis of the microstructures and the corrosion/oxidation products were carried out via Optical Microscopy, Scanning Electron Microscopy. As result it was verified the importance of the microstructure in the material's resistance to the action of degradation by oxidation, and its influence on the oxide layer formation process.","PeriodicalId":14116,"journal":{"name":"International Journal of Materials Science and Applications","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84374633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Testing and Fabrication of Metal Matrix Composite for Automotive Applications 汽车用金属基复合材料的实验测试与制造

International Journal of Materials Science and Applications Pub Date : 2021-01-01 DOI: 10.11648/j.ijmsa.20211006.12

Alie Wube Damtew, R. Thiyagarajan

引用次数: 0

Nurturing Plasmonic Properties of Nanocomposite Thin Films: The Importance of Optimum Oblate Shape 培养纳米复合薄膜的等离子体特性:最佳扁圆形状的重要性

International Journal of Materials Science and Applications Pub Date : 2021-01-01 DOI: 10.32732/jma.2021.10.2.73

R. Laha

{"title":"Nurturing Plasmonic Properties of Nanocomposite Thin Films: The Importance of Optimum Oblate Shape","authors":"R. Laha","doi":"10.32732/jma.2021.10.2.73","DOIUrl":"https://doi.org/10.32732/jma.2021.10.2.73","url":null,"abstract":"Metal nanoparticles (MNPs) embedded dielectric thin films are very crucial for many optoelectronic applications. This report investigates various ways of tuning the plasmonic properties of such nanocomposite thin films. For this, the well-known plasmon resonance condition was first generalized to include the shape and volume fraction of MNPs. This was followed by deriving an empirical formula for the resonance position (λR) which was worked out to be the positive root of a quadratic equation. The coefficients of the deduced quadratic relation involve the parameters obtained from the empirical fit to some of the experimental dielectric functions of MNPs available in literature. The derived working formula enables research community to tune the LSPR of nanocomposites in the whole range of visible wavelengths. The derived formula also concluded that with known lower volume fractions, shape of MNPs affects λR the most, compared to the other parameters. The derived formula was validated by calculating the full extinction spectra. It was shown for the first time that there exists an optimum value of oblate shape to give maximum resonance for a given nanocomposite.","PeriodicalId":14116,"journal":{"name":"International Journal of Materials Science and Applications","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74685784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Improvement of the System of Diagnostics of Metal Structures and Mechanisms of Foundry Cranes 铸造起重机金属结构与机构诊断系统的改进

International Journal of Materials Science and Applications Pub Date : 2021-01-01 DOI: 10.11648/j.ijmsa.20211004.12

Pеnchuk Valentin Alekseevich, Sidorov Vladimir Anatolyevich

引用次数: 0

Design of Piezoelectric Tile for Energy Harvesting: Experimental Approach 能量收集用压电瓦的设计:实验方法

International Journal of Materials Science and Applications Pub Date : 2021-01-01 DOI: 10.32732/jma.2021.10.2.83

Ehsan Maani Miandoab, A. Jafari, Aref Valipour

引用次数: 1

Slope Stability Analysis of the Gbeni Earth Dam (GB3) in Rutile - Sierra Leone 金红石-塞拉利昂Gbeni土坝(GB3)边坡稳定性分析

International Journal of Materials Science and Applications Pub Date : 2020-12-16 DOI: 10.11648/J.IJMSA.20200906.11

S. S. Turay, Osman Koroma, Abdul A. Koroma

{"title":"Slope Stability Analysis of the Gbeni Earth Dam (GB3) in Rutile - Sierra Leone","authors":"S. S. Turay, Osman Koroma, Abdul A. Koroma","doi":"10.11648/J.IJMSA.20200906.11","DOIUrl":"https://doi.org/10.11648/J.IJMSA.20200906.11","url":null,"abstract":"Earth slopes stability analysis is important in the design and construction of earth dams under different loading conditions. Several factors such as difference in water level or rapid drawdown in the reservoir, right after construction, and steady - state seepage may result in instability of Earth Dams for all possible combinations. In this study, three scenarios were evaluated for the Gbeni Earth Dam (GB3) at Sierra Rutile Mining Company in Sierra Leone. It is a zoned earth-filled embankment dam with respective upstream and downstream slopes of 1:3 and 1:2, having a horizontal sand blanket downstream. The upstream slope was subjected to both rapid drawdown in the reservoir of the earth dam and end of construction condition when there is no water present in the reservoir, whilst the downstream slope was assessed for steady seepage and end of construction conditions. The shape of the critical slip surface of both slopes was evaluated using a circular failure surface. The objective of this study was to assess the stability of these slopes under the above conditions using traditional analysis according to the theory of limit states and safety factor in GEO 5 software and its subprograms. The level of water on the upstream and downstream banks, the geotechnical properties of soil materials and boundary conditions of the dam were used as contribution variables and safety factors as the desired output. The study found out that the factor of safety against sliding of the upstream slope marginally drops within the short period after the start of rapid drawdown of water in the reservoir of the dam. Also, the downstream slope was found to be more stable under steady seepage. This accounts for the uncertainties involved in the strength of material, pore pressures in impervious clay core material, and long-term loading condition.","PeriodicalId":14116,"journal":{"name":"International Journal of Materials Science and Applications","volume":"49 1","pages":"66"},"PeriodicalIF":0.0,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75461486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Atmospheric Pollution on Building Materials in the Urban Environment 城市环境中大气污染对建筑材料的影响

International Journal of Materials Science and Applications Pub Date : 2020-11-15 DOI: 10.32732/jma.2020.9.2.70

A. Kuzmichev, V. Azarov, A. V. Kuzmichev

引用次数: 1

Development of Flame-Resistant Cotton Fabrics with Casein Using Pad-dry-cure and Supercritical Fluids Methods 用垫干固化和超临界流体法制备酪蛋白阻燃棉织物

International Journal of Materials Science and Applications Pub Date : 2020-10-17 DOI: 10.11648/J.IJMSA.20200904.11

Sechin Chang, B. Condon, Sunghyun Nam

{"title":"Development of Flame-Resistant Cotton Fabrics with Casein Using Pad-dry-cure and Supercritical Fluids Methods","authors":"Sechin Chang, B. Condon, Sunghyun Nam","doi":"10.11648/J.IJMSA.20200904.11","DOIUrl":"https://doi.org/10.11648/J.IJMSA.20200904.11","url":null,"abstract":"Traditional pad-dry-cure (PDC) and supercritical carbon dioxide (scCO2) methods were used to study the effectiveness of cotton fabrics treated with casein from bovine milk and eco-friendly inorganic materials, urea and diammonium phosphate. Trials were completed successfully. Thermogravimetric analysis (TGA), microscale combustion calorimeter (MCC), 45° angle and vertical flammability (clothing textiles test) and limiting oxygen index (LOI) tests were carried out for the treated cotton fabrics. When the treated fabrics were tested using the 45° angle flame, the ignited fabrics self-extinguished and left behind a streak of char. Treated higher add-on fabrics were neither consumed by flame, nor produced glowing embers upon self-extinguishing. All untreated cotton fabrics showed limiting oxygen index (LOI) values of about 18% oxygen in nitrogen. For formulations with casein, urea and diammonium phosphate, LOI values of treated fabrics were 29-40% oxygen in nitrogen when add-on values for the formulation were 9.5-18.7wt%. Furthermore, scanning electron microscope (SEM) was employed to characterize the chemical structure on the treated fabrics, as well as, the surface morphology of char areas of treated and untreated fabrics. The results indicate that fabrics treated with casein are flame resistant. The treated fabrics exhibited improved thermal stability, as evidenced by increased ignition times and lower heat release rates. The results of this study show that casein coated flame-resistant fabrics can be readily applied to textile fabrics using a continuous process that is ideal for commercial and industrial applications.","PeriodicalId":14116,"journal":{"name":"International Journal of Materials Science and Applications","volume":"47 1","pages":"53"},"PeriodicalIF":0.0,"publicationDate":"2020-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90904322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Review on Biosynthesis, Characterization and Antibacterial Activity of Silver Nanoparticles 纳米银的生物合成、表征及抗菌活性研究进展

International Journal of Materials Science and Applications Pub Date : 2020-10-13 DOI: 10.11648/j.ijmsa.20200903.12

Tizeta Abera

{"title":"Review on Biosynthesis, Characterization and Antibacterial Activity of Silver Nanoparticles","authors":"Tizeta Abera","doi":"10.11648/j.ijmsa.20200903.12","DOIUrl":"https://doi.org/10.11648/j.ijmsa.20200903.12","url":null,"abstract":"Recently, nanotechnology has attracted great attention due to its wide applications for different fields of science. Nanoparticles are a cluster of atoms in the range of 1-100 nm that provides mechanical, optical, electrical, and structural advanced, and also an increased surface area than the original substance. Nanostructure materials have got an enhancement to the feature of life and preservation of the environment. Now a day’s silver nanoparticles have gained attention due to its uses in various areas of human interest in the industry, medicine, human health, and agriculture. It is the most popular metallic nanoparticles in antimicrobial, antioxidant, and anti-cancer properties as different researchers reported. The objective of this review is to brief recent progress in the biosynthesis of AgNPs. This review may have a great contribution in the field of green synthesis, characterization, and antibacterial activities of AgNPs. There are three types of nanoparticles synthesis approaches they are physical, chemical, and biological methods. The biological method for the synthesis of AgNPs is a preferable approach due to its simplicity, cost-effectiveness, easily scale up to the industry and non-toxicity. Plants and their parts contain carbohydrates, fats, proteins, nucleic acids, pigments, and several types of secondary metabolites which act as reducing agents to produce nanoparticles from metal salts without producing any toxic by-product. In this review, different researches reported different particle size of AgNPs (0.011 – 90 nm) and shape by using different plant material. I conclude This review is concerned with the green synthesis of AgNPs, characterization, and antibacterial activity of AgNPs.","PeriodicalId":14116,"journal":{"name":"International Journal of Materials Science and Applications","volume":"1 1","pages":"47"},"PeriodicalIF":0.0,"publicationDate":"2020-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76935777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A Review Paper on: Effect of Different Types of Filler Materials on Marshall Characteristics of Bitumen Hot Mix 不同填料对沥青热混合料马歇尔特性影响的研究综述

International Journal of Materials Science and Applications Pub Date : 2020-09-25 DOI: 10.11648/J.IJMSA.20200903.11

Gazi Mohammad Harun-Or-Rashid, Mohammad Mohayminul Islam

{"title":"A Review Paper on: Effect of Different Types of Filler Materials on Marshall Characteristics of Bitumen Hot Mix","authors":"Gazi Mohammad Harun-Or-Rashid, Mohammad Mohayminul Islam","doi":"10.11648/J.IJMSA.20200903.11","DOIUrl":"https://doi.org/10.11648/J.IJMSA.20200903.11","url":null,"abstract":"Bituminous hot mix is one of the most widely used and costly flexible pavement layer. It involves a huge outlay of investment. Precise engineering and usage of proper materials can make it more cost efficient, durable, convenient for users and most importantly ecofriendly. To reduce the cost of construction engineers all over the globe are investigating for the alternative material to obtain same amount of output (strength, stability and durability) by paying a little. There are four constituents of a hot mix, coarse aggregate, fine aggregate, binder and filler. Filler in the bitumen hot mix fill the void in between the aggregates which is very important for strength and stability of the pavement. But the fillers are conventionally used (cement and lime) are very costly which affect the total cost of construction. That’s why the researchers emphasized on the waste material to serve this purpose as well as to keep the environment clean. A large range of waste material like fly ash, bagasse ash, marble dust, stone dust, brick dust, kiln dust, waste concrete dust, foundry sand, bio gypsum, ceramic dust etc. has been use as a filler for numerous research works by the researchers globally. The materials yielded very satisfactory results. Fly ash, bagasse results in nearly same Marshall properties (stability, OBC, %VFA, %VMA, %Va) like the conventional one. Although the brick dust and stone dust provide a high amount of air voids but they also result high stability. More or less all these non-conventional materials are capable to fully or partially replace the conventional filler. This study focused on the effect on the Marshall hot mix design properties after using these fillers mentioned above.","PeriodicalId":14116,"journal":{"name":"International Journal of Materials Science and Applications","volume":"48 1","pages":"40"},"PeriodicalIF":0.0,"publicationDate":"2020-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79820792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4