Procedia Materials Science最新文献_第10页

Properties of NiMnGa Alloys Ultra Rapidly Solidified by Suction Casting 吸铸超快速凝固NiMnGa合金的性能研究

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.04.111

Esteban Rodoni , Jorge M. Levingston , SebastiánDeghi , Daniel E. Lescano , Gabriela Pozo López , Silvia E. Urreta , Luis M. Fabietti

{"title":"Properties of NiMnGa Alloys Ultra Rapidly Solidified by Suction Casting","authors":"Esteban Rodoni , Jorge M. Levingston , SebastiánDeghi , Daniel E. Lescano , Gabriela Pozo López , Silvia E. Urreta , Luis M. Fabietti","doi":"10.1016/j.mspro.2015.04.111","DOIUrl":"10.1016/j.mspro.2015.04.111","url":null,"abstract":"<div>Ni2MnGa alloys are obtained by suction casting in water chilled cylindrical copper moulds 50mm long and 1-4mm in diameter; the microstructure and the magnetic properties are then investigated as functions of the cylinder diameter. The solidification substructures are characterized by scanning electron microscopy and confocal microscopy. The martensitic transformation temperatures, determined by magnetization vs. temperature measurements, are lower than those measured in bulk Ni2MnGa single crystals (202K). The demagnetization curves measured from saturation in the martensitic state show two steps: the first is at about+130 mT and the larger second one at relatively large inverse fields (about -300 mT), except in cylinders 4mm in diameter, where these steps overlap at low inverse fields. These steps are likely to arise from a demagnetization mechanism involving field induced twin boundary motion in a few martensite variants,indicating a ferromagnetic shape memory effect in the cylinders.</div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"8 ","pages":"Pages 577-585"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.04.111","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75788597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Materials Surface Science Applied to the Investigation of Cultural Heritage Artefacts 材料表面科学在文物调查中的应用

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.04.005

Marc Aucouturier , Evelyne Darque-Ceretti

{"title":"Materials Surface Science Applied to the Investigation of Cultural Heritage Artefacts","authors":"Marc Aucouturier , Evelyne Darque-Ceretti","doi":"10.1016/j.mspro.2015.04.005","DOIUrl":"10.1016/j.mspro.2015.04.005","url":null,"abstract":"<div>The skill of ancient artisans manufacturing artistic or everyday artworks surprises the modern material scientists. We show, through the study of archaeological pieces, how laboratory research instruments use enlightens the fabrication processes of unique items at antic periods. The specificity of surface science research favouring non-invasive means for investigations on museum objects is emphasised. The examples concern:- Nanostructured layers on ceramic surface to obtain the so-called lustre effect, invented by ancient Islam potters;- Intentional coloration of metallic objects by chemical patination, attested in Egypt on 2nd millenary BC and still applied by Japanese artisans;- The history of gilding objects: leaf gilding, mercury gilding, and other processes;- The Fresco technique, a perennial wall painting, known by ancient Roman and propagated through centuries.The examples open new fields belonging to the modern materials science, to understand the mechanism involved in processes with the constraint that one does not know all the fabrication steps.</div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"9 ","pages":"Pages 31-47"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.04.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73099074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An Investigation of Eddy Current, Solid Loss, Induced Voltage and Magnetic Torque in Highly Pure Thin Conductors, Using Finite Element Method 用有限元法研究高纯薄导体中的涡流、固体损耗、感应电压和磁转矩

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.11.016

M. Jalali Mehrabad, M.H. Ehsani

引用次数: 4

Effect of Salt Additives on the Fabrication of Poly (vinylidene fluoride-co-hexafluropropylene) (PVDF-HFP) Nanofiber Membranes for Air Gap Membrane Distillation 盐添加剂对气隙膜蒸馏制备聚偏氟乙烯-共六氟丙烯(PVDF-HFP)纳米纤维膜的影响

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.11.132

A. Hemmat , S.M. Ghoreishi , J. Karimi Sabet

{"title":"Effect of Salt Additives on the Fabrication of Poly (vinylidene fluoride-co-hexafluropropylene) (PVDF-HFP) Nanofiber Membranes for Air Gap Membrane Distillation","authors":"A. Hemmat , S.M. Ghoreishi , J. Karimi Sabet","doi":"10.1016/j.mspro.2015.11.132","DOIUrl":"10.1016/j.mspro.2015.11.132","url":null,"abstract":"<div>In the past few years, application of electrospun nanofiber has gained intensive attention for membrane distillation (MD) that exhibit promising results. In this study the effects of three salt additives including calcium carbonate (CaCO3), lithium chloride (LiCl) and calcium chloride (CaCl2) on the morphology, hydrophobicity, porosity and permeation performance of poly (vinylidene fluoride-co-hexafluropropylene) (PVDF-HFP) nanofiber membranes were investigated. Scanning electron microscopy (SEM), geniometer, gravimetric method and air gap MD (AGMD) setup were used to characterize the resultant PVDF-HFP membranes. It was observed that addition of LiCl and CaCl2 improved the electrospinability of polymer dope solution and changes the morphology of fibers from beaded fiber to a uniform fiber structure. Also the membrane made from the dope with LiCl as the additive salt possessed the highest porosity of % 89. The membrane hydrophobicity was affected less by CaCO3 as compared with LiCl and CaCl2. The synthesized membrane was applied in desalination via air gap membrane distillation, in which a water permeation flux of 13.6, 12.2 and 9.8 Lh-1m-2 were obtained when LiCl, CaCl2 and CaCO3 was used as the additive, respectively.</div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"11 ","pages":"Pages 370-375"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.11.132","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74520096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Performance Improvement of P3HT:CdSe Hybrid Solar Cell by Modifying Hole Injection Layer 通过修改空穴注入层改善P3HT:CdSe混合太阳能电池性能

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/J.MSPRO.2015.11.003

K. O. Aghmiyoni, V. Ahmadi, F. A. Roghabadi

引用次数: 7

Corn Starch 80:20 “Waxy”:Regular, “Native” and Phosphated, as Bio-Matrixes for Edible Films 玉米淀粉80:20“蜡质”:常规，“天然”和磷酸盐，作为可食用薄膜的生物基质

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.04.077

Tomy J. Gutiérrez , Noé J. Morales , María Soledad Tapia , Elevina Pérez , Lucía Famá

引用次数: 46

Wear Analysis of PM Compacts with Bainitic Microstructures, Under Unlubricated Sliding Conditions 无润滑滑动条件下含贝氏体组织的PM压实件磨损分析

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.05.033

Ceferino Steimbreger , Esa Vuorinea , Pernilla Johansson

{"title":"Wear Analysis of PM Compacts with Bainitic Microstructures, Under Unlubricated Sliding Conditions","authors":"Ceferino Steimbreger , Esa Vuorinea , Pernilla Johansson","doi":"10.1016/j.mspro.2015.05.033","DOIUrl":"10.1016/j.mspro.2015.05.033","url":null,"abstract":"<div>Ferrous and non-ferrous alloys can be processed by PM. Complex shapes and good surface finishes can be achieved, leading to promising applications, if mechanical properties are demonstrated to be high enough. At the same time, both bainitic and carbide free bainitic microstructures have proved to be excellent candidates for wear applications. Therefore, the aims of this project were steered towards analysing wear behaviour of PM compacts, in relation to their bainitic microstructures.Three materials were employed and two conditions were taken into account: materials before and after austempering. A reference material was considered, corresponding to Distaloy DC with Mo and Ni. Microstructure was analysed in all the cases by means of optical and scanning electron microscope and it was related to the behaviour observed. Pin on plate reciprocating sliding test without lubricant was utilised in order to measure friction coefficient and specific wear rate in the pins. Effects of alloying elements were also examined.It was found that austempering decreased impact resistance, but enhanced hardness in Distaloy DC. In contrast, the other two materials presented the opposite behaviour. However, the presence of additional alloying elements in the initial composition fulfilled to increase wear resistance, compared to the reference material. A possible interaction between pores and oxides that may influence wear behaviour was observed. Si allowed carbide free bainitic microstructure to form but heterogeneity could not be prevented. Therefore, the advantage of this microstructure could not be fully used. Results obtained in the present work can lead to new wear applications for PM products, containing bainitic microstructures.</div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"9 ","pages":"Pages 578-589"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.05.033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73801732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Combustion Syntheses of CoAl2O4 Powders Using Different Fuels 不同燃料下Co3O4粉末的燃烧合成

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.04.104

María Celeste Gardey Merino , Alfredo L. Estrella , Mariana E. Rodriguez , Leandro Acuña , María Silvina Lassa , Gustavo E. Lascalea , Patricia Vázquez

{"title":"Combustion Syntheses of CoAl2O4 Powders Using Different Fuels","authors":"María Celeste Gardey Merino , Alfredo L. Estrella , Mariana E. Rodriguez , Leandro Acuña , María Silvina Lassa , Gustavo E. Lascalea , Patricia Vázquez","doi":"10.1016/j.mspro.2015.04.104","DOIUrl":"10.1016/j.mspro.2015.04.104","url":null,"abstract":"<div>This research intends to analyse the potential use of CoAl2O4 as an opaque pigment for solar collector selective paints. The opacity of the pigment occurs when the average crystallite size is micrometric. The CoAl2O4 samples were synthesized through combustion methods using aspartic acid (Asp) or lysine (Lys) as fuels. The powders obtained were calcined at temperatures between 600°C and 1100°C. Afterwards, the product was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). It was observed a CoAl2O4 phase in all the samples. The lowest average crystallite size was ≈24nm corresponding to the sample obtained with Asp and calcined at 600°C, while both powders calcined at 1100°C showed sizes higher than 200nm. In the light of these results it is suggested the use of even higher calcination temperatures so as to obtain opaque pigments for solar collectors selective paints.</div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"8 ","pages":"Pages 519-525"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2015.04.104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79363811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 31

Effect of Processing Parameters on Compressive Strength of Metakaolinite Based Geopolymers: Using DOE Approach 工艺参数对偏高岭石基地聚合物抗压强度的影响——基于DOE方法

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/J.MSPRO.2015.11.047

M. Ghanbari, A. Hadian, A. Nourbakhsh

引用次数: 13

Thermosetting Polymer and Nano Clay Based Natural Fiber Bio- Composites 热固性聚合物和纳米粘土基天然纤维生物复合材料☆

Procedia Materials Science Pub Date : 2015-01-01 DOI: 10.1016/j.mspro.2015.06.095

K. Deepak, N. Srinivasa Reddy, T.V. Seshaiah Naidu

引用次数: 25