Preparation and Characterization of MOS Capacitors for in Situ Measurement during Radiation Damagestudies
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): María Luján Ibarra , Marcela Barrera , Martín Alurralde Space radiation environment is composed by a variety of particles with energies ranging from keV to some GeV. These particles are either trapped into the magnetic field of the Earth or are passing through the Solar System. Some of the satellite electronics is based on silicon devices which suffer degradation due to environmental radiation. To study heavy ion and other particles effects we designed and fabricated MOS (metal oxide semiconductor) ad hoc capacitors. Radiation damage te...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Study by Magnetic Barkhausen Noise of a 1020 Steel and 99.9% Nickel Plate
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): Cynthia Hucailuk , Nicolás Nuñez , Darío Torres When a low frequency external variable magnetic field is applied to a ferromagnetic material, a movement of its magnetic domains due to the realignment in the direction of the applied field occurs. This realignment produces a signal which is captured by a coil in the surface of the studied sample, as a high frequency noise (1kHz – 1MHz), known as magnetic Barkhausen noise (MBN). In this paper, the study of the signals obtained by the MBN technique in 1020 steel and 99.9% nickel samples i...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Phase Development During Thermal Treatment of a Fast-setting Cordierite-mullite Refractory
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): N.E. Hipedinger , A.N. Scian , E.F. Aglietti Cordierite based materials are widely used in high temperature applications due to their good thermo-mechanical properties and thermal shock resistance. They are generally employed in the kiln furniture (shelves, brackets, bearing plates) for firing ceramic pieces. Because of its low expansion coefficient and dielectric properties, cordierite is also used in advanced ceramics, catalyst supports automotive, industrial waste gas purification and parts subjected to sudden temperature changes. The l...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Synthesis and Characterization of Copper Nanoparticles/Polyvinyl Chloride (Cu NPs/PVC) Nanocomposites
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): A. Guzman , J. Arroyo , L. Verde , J. Rengifo In the present work, two-synthesis method for copper nanoparticles (Cu NPs) in polyvinyl chloride polymer (PVC) has been developed by adding previously synthesized NPs to the resin and by an in situ synthesis of the NPs. The resin was mixed with additives to enhance obtaining a pasty mixture called plastisol. The obtained plastisol is liquid at room temperature and have viscoelastic and pseudoplastic properties. The plastisol showed changes in its mechanical properties by heat action, like a r...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Study of Acoustic Emission in a Compression Test of Andesite Rock
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): D.A. Filipussi , C.A. Guzmán , H.D. Xargay , C. Hucailuk , D.N. Torres In the compression test of a material's sample, elastic waves produced by dynamic processes are known as acoustic emissions (AE). These waves, which propagate from the source to the material surface, arrive to the piezoelectric sensor where they are converted to electric signs and transformed into the typical AE parameters. These parameters will be employed for the evaluation of failure mechanisms present in the test. In this work, the mechanic behaviour of andesite'...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Artificial Additions for Cement: Reproduction in Laboratory of Fluidized Bed Ash
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): A. Guilarducci , L. Beltramini , M.F. Carrasco , M. Chiovetta , R. Grether This paper presents aexperimental laboratory simulation of wastes that will be produced as a result of the implementation of a circulating fluidized bed (CFB) steam generator that is being built in the town of Rio Turbio in the province of Santa Cruz (Argentina).For this analysis, the information published in the environmental impact study conducted by the GrupoIsoluxCorsán SA and Others - JV (2008) was used. The design data associated with the operation of the p...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Corrosion in 316L Porous Prostheses Obtained by Gelcasting
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): Ricardo W. Gregorutti , Cecilia I. Elsner , Liliana Garrido , Andrés Ozols Gelcasting (GC) process, usually used for ceramic moulding, is adapted for producing spongy or porous metal osteosynthesis components destined to bone void filling. The main objective of the interconnected porosity is to improve the osteoconductive of metal matrix by ingrowth of bone. Further, porosity reduces metal density and Young module, which causes bone resorption, leading to implant failure, phenomenon known as stress shielding. The employed GC is based on ...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Phenomenological Modeling of Mo in a Hot Isostatic Pressing (HIP) Process
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): Diego Gómez , Rodrigo Palma To analyze the behavior of molybdenum powders during hot isostatic pressing (HIP) at sintering temperatures, microscopic modeling of plastic densification mechanisms, power-law creep and diffusion based on equations found byArzt et al. [Metallurgical Transactions (1983) 14A] was performed. The results show that at high temperatures (T> 0.5T m , where T m is the meltingtemperature) and pressures higher than 15MPa, high relative densities (D> 0.95) can be obtained by power-law creep and diffusion ...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Study of the Formation of Cu-24at.%Al by Reactive Milling
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): M.F. Giordana , N. Muñoz-Vásquez , M. Garro-González , M.R. Esquivel , E. Zelaya In this work, powders of Cu and Al were milled with a proportion equal to 24% atomic Al, using low and medium energy mills. The initial, intermediate and final stages of the resulting powder are analyzed using scanning electron microscopy, X-ray diffraction and different transmission electron microscopy techniques. The structure and microstructure achieved in each step of the milling process are compared to the results of Cu-16at.% Al and Cu-30at.%Al obta...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
High Temperature Mechanical Behavior of Porous Cordierite-based Ceramic Materials Evaluated Using 3-point Bending
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): Sebastián E. Gass , María Laura Sandoval , Mariano H. Talou , Analía G. Tomba Martinez , María Andrea Camerucci , Eva Gregorová , Willi Pabst Cordierite-based ceramics are an important segment of the present ceramic industry. In the last years, cordierite-based porous ceramics have received great attention as light structural materials, thermal insulting and catalyst supports, among others. For these applications, a combination of high porosity and low weight of the component are required, together with mechanical stability even a...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Comparison of Tribological Properties of Stainless Steel with Hard and Soft DLC Coatings
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): Ana Gasco Owens , Sonia Brühl , Silvia Simison , Christian Forsich , Daniel Heim Stainless steels are widely used in chemical, petrochemical and food-processing industries due to their good anticorrosion properties. However, they generally exhibit poor tribological properties which limit their applications in tribocorrosive conditions. Surface modifications, like diamond-like carbon (DLC) coatings, can be an optimal technological solution to overcome this problem. These films have attracted considerable attention because of their outsta...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Ordering in the Solid Solution U(Al,Si)3
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): P.H. Gargano , P.R. Alonso , G.H. Rubiolo UAl3 - USi3 equilibrium phase diagram has already been analyzed by the present authors in a previous work based in a set of ab initio calculated energies for volume relaxed ordered structures. We evaluate in this work the formation energy of the disordered phase U(Al,Si)3 through a cluster expansion method from ab initio calculated total energies for full relaxed ordered structures. Total energies were calculated through a DFT based FP LAPW method in the GGA approximation, including scalar relativi...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Combustion Synthesis of Ultrafine Powders of Co3O4 for Selective Surfaces of Solar Collectors
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): M. Celeste Gardey Merino , M. Emilia Fernández de Rapp , Mónica Pinto , M. Elisa Etchechoury , M. Silvina Lassa , J. Miguel Martín Martínez , Gustavo E. Lascalea , Patricia G. Vázquez Solar selective paints, with the addition of Co3O4 as a pigment, are used to improve energetic efficiency in solar collectors. Although Co3O4has been obtained by different methods, references about combustion synthesis are scarce. Co3O4 powders have been synthesized by stoichiometric and non-stoichiometric routes using aspartic acid (Asp) or tri-hyd...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Thickness Dependence of Crystalline Structure of Al-doped ZnO Thin Films Deposited by Spray Pyrolysis
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): F.A. Garcés , N. Budini , R.D. Arce , J.A. Schmidt In this work, we have investigated the influence of thickness on crystalline structure of Al-doped ZnO films. Transparent conducting oxide films were grown by the spray pyrolysis technique from precursors prepared via the sol-gel method. We determined the structural properties of the films by performing X-ray diffraction and mosaicity measurements, which evidenced an increase of disorder and inhomogeneity between crystalline domains as the films thickened. This behavior was attributed to...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
Hardening and Coherent Precipitates Size Evolution with Aging Fe-12Al-12V Alloy
Publication date: 2015 Source:Procedia Materials Science, Volume 9 Author(s): Pedro A. Ferreirós , Paula R. Alonso , Gerardo H. Rubiolo Fe-Al based alloys have a remarkable potential for high temperature structural applications, provided that the limitation of their low creep resistance is solved. Third element addition (Nb, Ti, Zr or Ta) has proved to perform the task, at the expense of a low ductility. In previous works we have investigated ferritic alloys in the Fe-Al-V system with coherent precipitation of L21 phase (Fe2AlV) and have identified phases in equilibrium at the vertical section Fe1-2xAlxVx. We have ...
Source: Procedia Materials Science - July 3, 2015 Category: Materials Science Source Type: research
