Relevant bibliographies by topics / Aluminum oxide – Analysis

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  2. Dissertations / Theses
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  5. Conference papers

Academic literature on the topic 'Aluminum oxide – Analysis'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Aluminum oxide – Analysis"

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Zudov, A. I. "Thermodepolarization Analysis of Aluminum — Anodic Aluminum Oxide Electret Systems." Russian Physics Journal 48, no. 8 (August 2005): 848–53. http://dx.doi.org/10.1007/s11182-005-0211-1.

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Jamaludin, Shamsul Baharin, Josef Hadipramana, Mohd Fitri Mohd Wahid, Kamarudin Hussin, and Azmi Rahmat. "Microstructure and Interface Analysis of Glass Particulate Reinforced Aluminum Matrix Composite." Advanced Materials Research 795 (September 2013): 578–81. http://dx.doi.org/10.4028/www.scientific.net/amr.795.578.

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A characterization of microstructure and interface was made on the composites Al-4 % Cu reinforced with 15 wt. % glass particulate. The composite was fabricated by powder metallurgy followed by solution treatment and artificial ageing. The microstructures of the composite showed that the glass particulates were in-homogenously distributed in the matrix and segregated near copper. The aluminum oxide layer was found between aluminum, copper and glass particulate. Micro cracks were observed in the aluminum oxide layer and at the interface between aluminum oxide layer and aluminum. Hardness increased as ageing time increased. Interface behavior and aging time influenced the hardness of the composite.
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Paparazzo, E. "XPS analysis of iron aluminum oxide systems." Applied Surface Science 25, no. 1-2 (February 1986): 1–12. http://dx.doi.org/10.1016/0169-4332(86)90021-8.

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Kurdi, B. N., and D. G. Hall. "Analysis of electromagnetic modes of aluminum–aluminum-oxide–gold tunnel junctions." Physical Review B 34, no. 6 (September 15, 1986): 3980–87. http://dx.doi.org/10.1103/physrevb.34.3980.

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Wang, Yun, Ji Kang Yan, Guo You Gan, Jing Hong Du, and Jian Hong Yi. "Thermodynamic Analysis of Aluminum Oxide-Coated Titanium Didoxide." Advanced Materials Research 412 (November 2011): 410–14. http://dx.doi.org/10.4028/www.scientific.net/amr.412.410.

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In order to improve the dispersion of TiO2, use the surface coating technology to form the aluminium ion film on the surface of TiO2, so as to achieve the aim of modification. Use the aqueous solution sedimentary drying method to make the alumina coating experiment under as certain technical condition, use the test like the scanning electron microscopy and transmission electron microscope, etc to analyze the coating powder’s dispersive and coating situation. The paper started from the angle of ion sedimentary reaction equilibrium, made the thermodynamics analysis on the coating on the surface of TiO2 and got the [Al]T-pH relationship diagram about the aluminium ion, and then confirm the PH extent for the aluminium ion’s completed sedimentation. The result indicated that, when the PH value reached from 8 to 12, the aluminium ion would completely precipitate.
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Jung, Y. W., J. S. Byun, D. H. Woo, and Y. D. Kim. "Ellipsometric analysis of porous anodized aluminum oxide films." Thin Solid Films 517, no. 13 (May 2009): 3726–30. http://dx.doi.org/10.1016/j.tsf.2008.12.051.

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Kim, Mira, Yeongwoo Kim, Hakyoung Lee, Chan-Young Park, Won-Ki Lee, Taeho Kang, and Kwon Taek Lim. "Analysis of Polymer Hybrid-coated Anodic Aluminum Oxide." Molecular Crystals and Liquid Crystals 622, no. 1 (November 22, 2015): 120–24. http://dx.doi.org/10.1080/15421406.2015.1105037.

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Graham, Mike J. "Modern Analytical Techniques in High Temperature Oxidation and Corrosion." Materials Science Forum 522-523 (August 2006): 61–68. http://dx.doi.org/10.4028/www.scientific.net/msf.522-523.61.

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Modern analytical techniques are useful to characterize oxide films and to study oxide growth processes. This paper will summarize some of our work on the high temperature oxidation of both metals and semiconductors. Systems considered include binary III-V semiconductors, e.g. GaAs, which unlike silicon does not normally form high-quality native oxide. For GaAs, the influence of deuterium in the substrate and surface platinum have been evaluated with respect to oxide growth. Both aluminum-containing alloys (FeCrAl and NiAl) and semiconductors (AlGaAs, InAlAs and InAlP) are included. The objective is to produce good quality protective and insulating aluminum-containing oxides. In these studies, the application of several modern surface- analytical techniques, particularly Auger electron spectroscopy, X-ray photoelectron spectroscopy and secondary ion mass spectrometry, complemented by other techniques, e.g. transmission electron microscopy and X-ray analysis provides useful information on the chemical composition of the oxides and leads to a better understanding of oxidation and corrosion phenomena. In the case of AlGaAs and InAlP, thermal oxidation produces aluminum-containing oxides that have good insulating characteristics which makes the oxide films potentially useful for some device applications.
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Baca-Arroyo, Roberto. "Synthesis of an Aluminum Oxide-Based Functional Device Engineered by Corrosion/Oxidation Process." Crystals 10, no. 9 (August 21, 2020): 734. http://dx.doi.org/10.3390/cryst10090734.

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A disordered aluminum oxide grown on recycled aluminum sheets was synthesized by a corrosion/oxidation process. First, aluminum sheets recovered from unusable beverage cans were mechanically polished and dried in air atmosphere. Second, corrosion and oxidation into the aqueous solutions were the synthesis stages to produce aluminum oxide. Phase formation and electrical conduction of aluminum-oxide layers were validated by X-ray diffraction analysis and current–voltage plots at room temperature. An aluminum oxide-based structure operating under unusual principles at an extended lifetime resulted when an aluminum-oxide layer was inserted between two aluminum electrodes. This was attributed to an unusual electrical conduction. Some suggested models from the circuit theoretic properties are discussed here for potential usefulness for the aluminum oxide synthesized, as an environmental-friendly material that can be further useful into a sustainable scenario.
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Xamidov, Anvar, Farhodjon Hoshimov, Shavkat Mamatkulov, Khakimjan Butanov, Mirakhmat Yunusov, and Olim Ruzimuradov. "Catalytic Activity of Ni, Co, Mo Supported Anodic Aluminum Oxide Nanocomposites." Bulletin of Chemical Reaction Engineering & Catalysis 15, no. 3 (November 10, 2020): 845–52. http://dx.doi.org/10.9767/bcrec.15.3.8480.845-852.

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Nanostructured catalysts based on porous aluminum oxide (PAO) and some 3d metals, such as: nickel, cobalt, and molybdenum, have been obtained by anodic oxidation and impregnation. The synthesis of porous aluminum oxide with a highly ordered pore structure with pore sizes of 50 nm and a thickness of 50 µm is carried out by the method of two-stage anodic oxidation. The catalysts are obtained by impregnation of 3d metals into nanosized pores of aluminum oxide. The obtained catalysts based on nickel and porous Al2O3 are studied by scanning electron microscopy (SEM-EDX). The results of SEM-EDX analysis shows that a spongy structure with filament sizes of 100 nanometers containing particles of 3d metals formed on the surface of the aluminum oxide matrix. The results are presented on the activity of nickel and heterogenic cobalt and molybdenum nanoparticles in the reaction of hydrogenation of hexene to hexane. The results show that the yield temperature of the hexane is decreased and the yield of hexane is observed at 200 °C with Ni/Al2O3 catalysts, and a similar yield of hexane mass is achieved at temperatures higher than 250 °C with Co-Mo/Al2O3 and traditional nickel catalysts on kieselguhr. Copyright © 2020 BCREC Group. All rights reserved
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Dissertations / Theses on the topic "Aluminum oxide – Analysis"

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Dai, Congxia. "An advanced data acquisition system & noise analysis on the aluminum reduction process." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=2850.

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Thesis (M.S.)--West Virginia University, 2003.
Title from document title page. Document formatted into pages; contains ix, 82 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 75-78).
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Venzant, Kenneth L. "Analysis of residual stresses in laser trimmed alumina microelectronic substrates." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07102009-040540/.

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Walker, Justin I. "Spectroscopic Analysis of Materials for Orthopaedic and Energy Conversion Applications." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1226948982.

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Gignac, Lynne Marie. "Processing and characterization of RF sputtered alumina thin films." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184611.

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Thin films of alumina were deposited on ferrite (NiₓZn₍₁₋ₓ₎Fe₂O₄), glass, single crystal silicon and graphite substrates by RF sputtering. Though standard, amorphous Al₂O₃ films are readily soluble in hot phosphoric acid, these sputtered films exhibited only reluctant etchability by the acid. Experiments were initially performed to understand the parameters in the sputtering process which were influential in the formation of unetchable films. The results showed that a high concentration of water vapor or oxygen molecules in the sputtering chamber during deposition was the most significant variable controlling the growth of unetchable films. The films were categorized according to their degree of solubility in H₃PO₄ and were examined using various microanalytical characterization techniques. TEM analysis directly showed the existence of crystalline γ-Al₂O₃ in the film at the film-substrate interface. The γ-Al₂O₃ phase grew with a preferred orientation coincident with the substrate orientation--as in heteroepitaxial growth. The occurrence of this film phase was related to the oxygen partial pressure, the substrate material, and the substrate temperature and was believed to be the cause of the film's incomplete etching behavior.
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Johnson, Brian Ivins. "Preparation and Detailed X-Ray Photoelectron Spectroscopy and Spectroscopic EllipsometryAnalysis of Ultrathin Protective Coatings." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8119.

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Ultra-thin films (UTFs) are important in many applications, seen in the semiconductor industry, in chromatography, in sensing, in microfluidics, in aerospace, and in robotics. They also protect materials from corrosion, change surface energies, limit water intrusion into materials, allow material self-cleaning and self-healing, provide scratch resistance, and impart other specific chemical properties. In many cases, UTFs drastically alter surface properties and therefore their applications. It is imperative that proper and consistent characterization be performed on coatings to confirm and understand their desired properties. In Chapter two, Al oxidation under MgF2 protective layers is studied using real time X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry (SE). These tools allowed me to monitor Al oxidation for both short (hours) and long (months) periods of time. XPS revealed the chemical changes that took place in these materials as a function of time, and these changes were verified with SE. These studies help increase an understanding of aluminum changes under MgF2 protective layers. The third chapter demonstrates ab initio calculations guided X-ray photoelectron spectroscopy (XPS) analysis of surfaces functionalized with fluorinated silanes. This study addresses deficiencies in the literature where CF2:CF3 ratios from experimental XPS data do not match theoretical CF2:CF3 ratios. In a systematic approach, I developed semi-empirical models directed both by ab initio calculations and adjustable, empirical parameters. These models were effective in describing the raw data and exceeded fitting methods used in literature. In Chapter four, SiO2 UTFs with variable thicknesses deposited on Eagle XG® glass substrates are characterized. Challenges associated with this work consisted of similar optical functions of the film and substrate as well as backside reflections from the substrate. These obstacles were met using a multi-sample analysis (MSA), a variable angle spectroscopic ellipsometric approach, and mechanical abrasion/roughening of the substrate backside. With these approaches, I developed a model that precisely fit the data collected from all the samples and gave the correct optical function of the material along with thickness values for each film. Surface characterization represents a commitment of resources. It takes time to make measurements, and it takes time to analyze and understand the results. As presented in this work, I increase understanding of ultra-thin films at interfaces using both a multi-tool approach as well as using multiple analytical methods on data collected from each tool.
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Bedin, Flávia Caroline. "Coprecipitados de alumínio e cério com 8-hidroxiquinolina: obtenção e comportamento térmico." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1114.

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O presente estudo teve como foco avaliar a influência das variáveis pH, temperatura e tempo de agitação na obtenção e no comportamento térmico dos coprecipitados de alumínio e cério com 8-hidroxiquinolina. O processo de síntese foi realizado através da metodologia de coprecipitação, utilizando como agente precipitante a 8-hidroxiquinolina. Para um melhor controle das variáveis influentes no sistema de precipitação, pH, temperatura e tempo de agitação, elaborou-se um planejamento experimental, semelhante ao planejamento estatístico, visando a otimização do processo. Foram utilizados, pH: 5, 10 e 7,5; temperatura: 25, 60 e 42,5 °C; tempo de agitação de 1, 2 e 3 h. Foram obtidos coprecipitados de todas as combinações das variáveis possíveis, esperando ter como resposta a influência de cada uma das variáveis no comportamento térmico dos complexos obtidos. Após síntese dos complexos os mesmos foram submetidos à análise de espectroscopia no infravermelho, onde se constatou a presença dos mesmos compostos para todas as condições. Foi realizada a análise térmica a fim de determinar a influência de cada um dos fatores sob o comportamento térmico dos complexos obtidos. A análise foi efetuada em atmosfera oxidativa, variando a taxa de aquecimento em 5, 10 e 20 °C min-1. Com o auxílio das curvas de análise térmica, observou-se que todas as variáveis tiveram influência no comportamento térmico dos materiais, sendo o pH, a variável que apresentou a diferença mais significativa entre os processos. A fim de determinar as fases dos óxidos obtidos após o tratamento térmico, utilizou-se a análise de difratometria de raios-X e, por meio desta, constatou-se que apesar as diferenças dos comportamentos térmicos dos materiais, as fases obtidas para todas as condições foram as mesmas, ou seja, uma mistura de óxido de alumínio e óxido de cério.
The present study had as focus to evaluate the influence of the PH variables, temperature and time of agitation to obtain and the thermal behavior of co-precipitation of aluminum and cerium with 8-hidroxiquinolina. The process of syntheses was accomplished through the methodology of co-precipitation, using as precipitant agent the 8-hidroxiquinolina. For a better control of the variables that influence the precipitation system, pH, temperature and agitation time, it was elaborated an experimental planning, similar to the static planning, having as goal the optimization of the process. It was utilized, pH: 5, 10 and 7.5; temperature: 25, 60 and 42.5 ºC; agitation periods of 1, 2 and 3 h. It was obtained co-precipitation of all the variables possible combinations, hoping to have the influence of each variable on the thermal behavior of the complexes obtained. After syntheses of the complex the same were submitted to the spectroscopy analysis on the infrared where it was established the presence of the same compounds for all the conditions. The thermal analysis was done with the goal to determinate the influence of each one of the factors of the thermal behavior of the obtained complexes. The analysis was done in an oxidative atmosphere, varying the heating rate in 5, 10 and 20 º C min. With the aid of the thermal analysis curves, it was observed that all the variables had influence in the thermal behaviors of the materials, being the pH, the variable that presented the most significant difference between the processes. To determine the phases of the oxides obtained after the thermal treatment, it was used the x-ray diffraction analysis and, by that, it was established that despite the differences in the thermal behavior of the materials, the phases obtained to all the conditions were the same, meaning, a mixture of oxide of aluminum and cerium oxide.
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Poduri, Shripriya Darshini. "THEORETICAL MODELING AND ANALYSIS OF AMMONIA GAS SENSING PROPERTIES OF VERTICALLY ALIGNED MULTIWALLED CARBON NANOTUBE RESISTIVE SENSORS AND ENHANCING THEIR SENSITIVITY." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/51.

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Vertically aligned Multiwalled Carbon Nanotubes (MWCNTs) were grown in the pores of Anodized Aluminum Oxide (AAO) templates and investigated for resistive sensor applications. High Sensitivity of 23% to low concentration (100 ppm) of ammonia was observed. An equivalent circuit model was developed to understand the current flow path in the resistive sensor. This helped us in achieving high sensitivities through amorphous carbon (a-C) layer thickness tailoring by employing post-growth processing techniques like plasma etching. A simulation model in MATLAB was developed to calculate the device resistance and the change in the sensitivity as a function of device parameters. The steady state response and transient response of the model to the number of ammonia molecules and its adsorption rate were studied. Effects of oxygen plasma, argon plasma and water plasma etch on thinning of the a-C layer were studied. In order to enhance the sensitivity, the top and bottom a-C layers were replaced by a more conductive metal layer. This also helped in understanding the current flow in the device and in the estimation of the resistivity of the a-C layer.
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Santos, Thales Borrely dos. "Controle de propriedades de filmes finos de óxido de alumínio através da assistência de feixe iônico." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-03062017-212721/.

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Este trabalho tem por objetivo a caracterização de filmes finos de óxido de alumínio produzidos por deposição assistida por feixe de íons Ar+. Tal caracterização consiste em estabelecer a relação entre os parâmetros de produção (energia do feixe e uxo relativo de Ar), a composição e a estrutura dos lmes. Para tanto, utiliza-se técnicas de microscopia de força atômica, difração de raios-x, reetividade de raios-x e análise por feixe iônico. Resultados mostram que amostras produzidas à temperatura ambiente e à 450 oC são amorfas independentemente da energia do feixe iônico. Filmes formados com assistência de feixe possuem qualidade superior àqueles formados por deposição física de vapor. O bombardeamento de íons Ar+ mostra-se capaz de controlar a concentração de hidrogênio, a estequiometria, a rugosidade, o tamanho dos grãos e a densidade dos lmes nos. Amostras com excelente qualidade baixa rugosidade, estequiometria próxima da ideal e boa densidade foram produzidas utilizando íons com energia dentre 300 eV e 600 eV.
The scope of this work is the characterization of aluminum oxide thin films produced by Ar+ ion beam assisted deposition. This characterization consists in establishing the relationship between production parameters (ion beam energy and argon relative ux), structure and composition of these lms. In order to undertake this task, the following techniques were used: atomic force microscopy, x-ray diraction, x-ray reectivity and ion beam analysis. Results show that samples produced at room temperature and at 450 oC are amorphous regardless the ion beam energy. Films grown under ion assistance have better characteristics than the ones deposited by physical vapor deposition. The ion beam bombardment is capable of controlling hydrogen concentration, stoichiometry, roughness, grain size and density of alumina samples. High quality lms at surface and increased density lms with near ideal stoichiometry were produced with 300 eV and 600 eV ion beam energy.
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Carossi, Lory Cantelli. "Propriedades ópticas da alumina anódica porosa e o efeito do guia de onda." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/9003.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Nanoporous anodic alumina films (NAA) may present different behavior to reflectance and photoluminescence techniques, with Fabry-Pérot interferences and waveguide properties. This phenomenon makes possible the use of NAA as transducer signal in optical sensors. In this work, we investigated how the pre-treatment, the number of steps of anodizing, the anodizing electrolyte mode and temperature affect electrochemical characteristics, morphological and optical mainly NAA. As a result, it was noticeable that the realization of electropolishing is necessary for both the NAA with good regularity as to make it possible to obtain a spectrum with the Fabry-Pérot interference. If the fabrication of NAA is done in two steps, it is possible to obtain reflectance spectra and luminescence fringed with better amplitudes, areas and heights. Regarding the anodizing mode, both the NAA anodized in galvanostatic how potentiostatic showed similar morphologies and spectra with fringes, but the interferences were better defined when the galvanostatic mode was performed. Regarding the temperature, it was noticeable that the change of this parameter leads influences the porous oxide thickness. The spectrum of the luminescence and reflectance increasing the electrolyte temperature caused an increase in interference. However, the range and resolution of interference decreased with increasing temperature. The oxide thicknesses were estimated by energy variation (?E), graph slope between order and 1/? and fast Fourier transform (FFT) techniques. The ratio of film thickness and pore diameter (L/dp) was performed to validate the NAA films with better waveguides property. Moreover, the surface composition analysis of NAA films anodized in phosphoric acid, oxalic acid and mixtures thereof by backscattering spectroscopy Rutherford (RBS) was performed. From simulations it was possible to note that the amount of carbon in the porous oxide structure is practically zero, which may indicate that the origin of the luminescence is related to the presence of more centers F.
Filmes de alumina anódica porosa (AAP) podem apresentar, espectros de reflectância e luminescência com interferências de Fabry-Pérot e propriedades de guias de onda. Esse fenômeno possibilita que a AAP possa ser utilizada como plataforma em sensores ópticos. Neste trabalho, foi investigado como o pré-tratamento, o número de etapas de anodização, o modo de anodização e a temperatura do eletrólito afetam características eletroquímicas, morfológicas e principalmente ópticas da AAP. Como resultado, foi possível notar que a realização do eletropolimento é necessário para obter tanto a AAP com boa regularidade como para que seja possível obter um espectro com as interferências Fabry-Pérot. Se a fabricação da AAP for feita em duas etapas, é possível obter espectros de reflectância e luminescência com franjas com melhores amplitudes, áreas e alturas. Com relação ao modo de anodização, tanto as AAPs anodizadas em modo galvanostático como potenciostático apresentaram morfologias semelhantes e espectros com franjas, mas as interferências foram melhor definidas quando o modo galvanostático foi realizado. Com relação à temperatura, foi possível notar que a mudança desse parâmetro ocasiona influencia na espessura do óxido poroso. Quanto aos espectros de luminescência e reflectância, o aumento da temperatura do eletrólito ocasionou um aumento no número de interferências. Entretanto, a amplitude e a resolução das interferências diminuíram com o aumento da temperatura. A espessura do filme poroso foi estimada pelas técnicas de variação de energia (?E), coeficiente angular do gráfico entre ordem da interferência e 1/? e através da transformada rápida de Fourier (FFT). E foi utilizada a razão entre a espessura do filme e diâmetro do poro (Esp/Dp) para averiguar os filmes de AAP com guias de onda que pudessem ser utilizadas como substratos para sensores ópticos. Além disso, foi realizada a análise de composição superficial dos filmes de AAP anodizados em ácido fosfórico, oxálico e mistura destes ácidos pela técnica de espectroscopia de retroespalhamento de Rutherford (RBS). A partir das simulações realizadas foi possível notar que a quantidade que carbono na estrutura do oxido poroso é praticamente nula, o que pode indicar que a origem da luminescência está relacionada à presença dos centros F.
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Dias, Marcio Soares. "Desenvolvimento de modelos analiticos para propriedades termicas e condução de calor transiente em varetas combustiveis nucleares." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266280.

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Orientadores: Elizabete Jordão, Vanderley de Vasconcelos
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: A dependência com a temperatura das propriedades térmicas dos materiais faz com que a análise do transiente térmico em varetas combustíveis de reatores nucleares seja não-linear. Tradicionalmente, métodos de diferenças finitas ou de elementos finitos são utilizados para resolver este problema. A remoção efetiva do calor gerado nas varetas combustíveis constitui uma das considerações primárias no projeto de reatores nucleares. Os fabricantes de combustíveis nucleares e as geradoras de energia elétrica de fonte nuclear devem demonstrar a segurança do reator através da análise dos resultados de situações transientes diversas. Estes transientes podem ocorrer tanto em operação normal, quanto em situações de acidentes e devem ser analisados para assegurar que a vareta combustível manterá sua integridade para todas estas condições. A equação de transferência de calor para o combustível é não-linear. Esta equação não-linear de diferenciais parciais pode ser convertida em uma forma linear por meio da transformação baseada nas propriedades térmicas. Este trabalho apresenta a análise teórica aplicada no desenvolvimento de um modelo analítico, aqui chamado de variacionais relativos e direcionado para a modelagem de propriedades térmicas de materiais cerâmicos de aplicação nuclear, em particular o dióxido de urânio, UO2, e o óxido de alumínio, Al2O3. As propriedades térmicas modeladas são aquelas envolvidas no processo de condução de calor em materiais cristalinos: expansão térmica, calor específico, condutividade térmica e as suas formas integrais. No processo de avaliação de dados foram utilizados cerca de 5500 medidas de propriedades físicas e térmicas disponíveis na literatura aberta. Com base neste desenvolvimento é estabelecida a relação linear entre a variação de entalpia e a integral de condutividade térmica do UO2. Esta relação permite resolver, analiticamente, as distribuições espacial e temporal de temperaturas no combustível nuclear para as condições de estado estacionário e de transiente. A solução encontrada aplica-se igualmente outros sistemas onde o balanço de energia seja determinado pelo equilíbrio entre calor armazenado e calor transportado. A modelagem analítica desenvolvida amplia as possibilidades de avaliação crítica da consistência de propriedades térmicas e físicas dos materiais
Abstract: The temperature dependence of the material thermal properties makes the transient thermal analysis of reactor fuel pins to be non-linear. Traditionally, finite difference or finite element methods have been used to solve this problem. Effective heat removal from the fuel pins of a nuclear reactor poses one of the primary considerations in reactor design. Nuclear fuel vendors and nuclear electricity utilities must demonstrate the safety of the reactor by thorough examination of the outcome of various transient situations. These transient effects may occur in normal operation as well as in accident situations and must be analysed to insure the fuel pin maintains its integrity. The governing heat transfer equation for the fuel is non-linear. This non-linear, partial differential equation can be recast into a linear form by introducing a transformation based on material property. This work presents the theoretical analyses to develop a analytical model, here named model of relative variationals, for modelling of thermal properties of nuclear ceramic materials, in matter uranium dioxide, UO2, and aluminium oxide, Al2O3. The modeled thermal properties are those involved in the process of heat transport in crystalline materials: thermal expansion, specific heat, thermal conductivity and their integral forms. In the data evaluation process were used about 5500 measures of physical and thermal properties available in the open literature. Based on this development, the linear relationship has been established between the UO2 enthalpy and thermal conductivity integral. This relationship enables the heat conduction equation to be solved analytically for steady state and transient conditions. The solution is also applied in other systems where the balance of energy is determined by the equilibrium between stored heat and transported heat. The developed analytical modelling enlarges the possibilities for critical evaluation of the thermal and physical properties of the materials
Doutorado
Sistemas de Processos Quimicos e Informatica
Doutor em Engenharia Química
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Books on the topic "Aluminum oxide – Analysis"

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Walton, Simon John. Analysis of the aluminium oxide layer by Auger Electron Spectroscopy. Wolverhampton: University of Wolverhampton, 1993.

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ZnO bao mo zhi bei ji qi guang, dian xing neng yan jiu. Shanghai Shi: Shanghai da xue chu ban she, 2010.

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Wharmby, Angela. Interferences affecting the analysis of aluminum in waters by solvent extraction-atomic absorption spectrometry: A comparison of two solvent extraction procedures using the Oxine-MIBK system. Alberta Environmental Centre, Water and Wastewater Research, 1994.

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H, Jaskowiak Martha, and Lewis Research Center, eds. High temperature mechanical characterization and analysis of Al₂O₃/Al₂O₃ composites. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1999.

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Book chapters on the topic "Aluminum oxide – Analysis"

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Zhang, Jian-liang, Zhen-yang Wang, Xiang-dong Xing, and Zheng-jian Liu. "Effect of Aluminum Oxide on Compressive Strength of Pellets and Its Mechanism Analysis." In 5th International Symposium on High-Temperature Metallurgical Processing, 377–83. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118887998.ch47.

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Beck, Markus, Karl-Heinz Lang, Otmar Vöhringer, and Detlef Löhe. "Thermal-Mechanical Fatigue of the Oxide Dispersion Strengthened Aluminium Al-1.5 Al2 O3." In Microstructural Investigation and Analysis, 273–78. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527606165.ch44.

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Dispinar, Derya. "Melt Quality Assessment." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-120052503.

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It is well known that the reaction of liquid aluminum with the moisture in the environment results in two products: aluminum oxide and hydrogen gas that dissolves in aluminum. Both of these products are considered to be detrimental to the properties of aluminum alloys. Therefore, test equipment has been developed to check the levels of these defects in the melt. Many of these involve expensive and consumable tools. In addition, an experienced personnel may be required to interpret the results. Nonetheless, aluminum oxide is harmless as long as it remains on the surface. The problem begins when this oxide is entrained into the liquid aluminum such as turbulence during transfer or mold filling in a non-optimized design. This can only happen by folding of the oxide. During this action, rough surface of the oxides comes in contact to form no bonds. These defects are known as bifilms that have certain characteristics. First, they act as cracks in the cast parts since they are oxides. It is important to note that aluminum oxide has thin amorphous oxide (known as young oxides) and thick crystalline oxide (γ-Al2O3) that may be formed in a casting operation. Second, almost zero force is required to open these bifilms due to the unbonded folded oxide skins. Thus, these defects can easily form porosity by unravelling during solidification shrinkage. On the other hand, the formation of porosity by hydrogen is practically impossible. Theoretically, hydrogen has high solubility in the liquid but it has significantly low solubility in solid aluminum. Thus, it is suspected that hydrogen is rejected from the solidification front to form hydrogen gas and porosity. However, the hydrogen atom has the smallest atomic radii and high diffusibility. Therefore, segregation of hydrogen in front of the growing solid is difficult. In addition, the energy required for hydrogen atoms to segregate and form hydrogen gas molecule is around 30,000 atm. Under these conditions, porosity formation by hydrogen is not likely to be achieved. Hydrogen probably stays in a supersaturated state or diffuses homogeneously through the cast part. The effect of hydrogen can only be seen when it can diffuse into the unbonded gap between the bifilms to open them up to aid the unravelling of bifilms to form porosity. This phenomenon can be easily detected by a very simple test called reduced pressure test. When a sample is solidified under vacuum, the bifilms start to open up. Since all porosity is formed by bifilms, the cross section of the sample solidified under vacuum can be analyzed by means of image analysis software. The sum of maximum length of pores can be measured as an indication of melt quality. Since bifilms are the most detrimental defects, this value is called “bifilm index” given in millimetres, which makes this test the only test that can quantify aluminum melt quality in such detail including both the effects of bifilms and hydrogen together. Several Al-Si alloys were used at various conditions: degassing with lance, ceramic diffusers, and graphite rotary has been compared. Gravity sand casting, die casting, and low-pressure die casting methods were evaluated. The effect of grain refiners and modifiers was studied. And the evolution of the bifilm index has been presented.
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Tao, Shaohu, Jianping Peng, Yuezhong Di, Kejia Liu, Kun Zhao, and Naixiang Feng. "Electrochemical Study of Potassium Fluoride in a Cryolite-Aluminum Oxide Molten Salt." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000409.

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Selective and efficient electrochemical methods to characterize aluminum are necessary. Current methods are based on potentiodynamic polarization, recurrent potential double pulses, chronopotentiometry, open-circuit chronopotentiometry, and potentiostatic electrolysis, but have not been used to characterize the deposition of aluminum in Na3AlF6-Al2O3-KF molten salts. The control processes of the formation of aluminum-tungsten inter-metallic compounds, and the deposition of aluminum have been investigated by using steady-state potentiodynamic cathodic polarization curves. The dissolution loss rate of aluminum was determined with an increase in KF concentration by the analysis of recurrent potential double pulses. Using chronopotentiometry, it was confirmed that the deposition potential of aluminum shifted more negative as the KF concentration increased, and a higher KF concentrations induced a higher cathodic overpotential. From open-circuit potential measurements and scanning electron micrographs, it was concluded that aluminum(III) ions react with tungsten substrates to form an aluminum-tungsten compound, and the reaction mechanism of aluminum was determined. These electrochemical methods applied with aluminum electrolysis were accurate, efficient, and reliable.
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Tiryakioğlu, Murat, and Nelson Netto. "Friction Stir Processing: Effect on Microstructure and Mechanical Properties in Cast Aluminum Alloys." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000347.

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Microstructural and mechanical data from the literature of friction stir processed (FSPed) cast aluminum alloys were reanalyzed. Results indicated that friction stir processing (FSP) produced more homogeneous microstructures, with finer eutectic Si particles, grains, and intermetallics. However, a relationship between microstructural measures and process parameters could not be established. Regardless of the resultant microstructure, structural casting defects, i.e., pores and oxide films, were reduced in size or completely eliminated after FSP. Consequently, ductility and fatigue life were drastically improved by FSP. Quality index analysis showed that some FSPed specimens have a higher structural quality than aerospace and premium quality castings, and can be used to determine the intrinsic properties of cast aluminum alloys.
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Deshpande-Purohit, Pritee, Shashikant Vagge, and Bhavana Shrigadi. "Cyclic Oxidation of Combined LTA/YSZ and Alumina Thermal Spray Coatings." In Advanced Surface Coating Techniques for Modern Industrial Applications, 71–87. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4870-7.ch003.

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Thermal barrier coatings protect the substrate from thermal diffusion, oxidation, phase transformations, elastic deformation, plastic deformation, creep deformation, thermal expansion, thermal radiation. It allows parts and components of gas turbines to withstand high temperature upto1650 °C. Cylic oxidation behavior of alumina incorporated, lanthanum titanium aluminum oxide (LaTi2Al9O19), and yttria stabilized zirconia (YSZ), that is LTA/YSZ top ceramic layer coating, was investigated. Two coating combinations, L 100 having top LTA layer thickness of 100 µm and L 150 having top layer of LTA having thickness 150 µm, were tested for thermal cycles at the temperature of 1100°C. The performances of these coatings were compared with conventional YSZ coatings. Microstructure studies, EDX, and XRD analysis demonstrated the formation of mainly LTA, LaAlO3, Al2TiO5, Al2O3, and TiO2 at 1100°C in both coatings. But in L 150 coating, the rate of oxidation was found slower than L 100 coating. Annealed L 150A and L 100A specimens show cyclic oxidation life of 272th and 250th cycles, respectively.
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Fathy Mubarak, Mahmoud, Alshimaa Maher Ahmed, and Sahar saad Gabr. "Nanoporous Carbon Materials toward Phenolic Compounds Adsorption." In Nanopores [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96380.

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Nanoporous carbon-based sorbents are used to generate a three-dimensional real-space model of the nanoporous structure using the concept of Gaussian random fields. This pore model is used to derive important pore size characteristics, which are cross-validated against the corresponding values from gas sorption analysis. After filling the model pore structure with an aqueous electrolyte and rearranging the ions via a Monte Carlo simulation for different applied adsorption potentials. In comparison to nanopores formed from solid-state membranes (e.g., silicon oxide, aluminum oxide, polymer membranes, glass, hafnium oxide, gold, etc.) and very recently 2D materials (e.g., boron nitride, molybdenum disulfide, etc.), those nanopores produced from carbon materials (e.g., graphene, carbon nanotubes (CNTs), diamond, etc.), especially those from graphene appear to be perfect for adsorption process. The thickness of carbon structures nanopores can be as thin as 0.35 nm, resembling the height of the base spacing. Moreover, the sizes of carbon structures nanopores can be precisely fabricated and tuned to around 1.0 nm, the similar size of many heavy metals and organic pollutants molecules. Furthermore, carbon materials are chemically stable and feature-rich surface chemistry. Therefore, various carbon nanopore sequencing techniques have been developed. Finally, in this chapter the adsorption of phenolic compounds on nanoporous carbon specifically the active carbon are overviewed and how to affect the heterogeneity of activated carbon surface, PH of the solution on the efficiency of adsorption.
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Andala, Dickson Mubera, Erick Mobegi, Mildred Nawiri, and Geoffrey Otieno. "Fabrication of Metal Oxide-Biopolymer Nanocomposite for Water Defluoridation." In Advances in Environmental Engineering and Green Technologies, 242–71. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1871-7.ch013.

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Fluoride contamination in groundwater affects about 150 million people worldwide. In this study, the authors focused on synthesizing biopolymer metal oxide nanocomposite for fluoride removal. Nanocomposite material was done using SEM. As(V), Al, Ti, Zr, and Fe water samples were analysed by ICP-MS (inductively coupled plasma-mass spectrometry). Fluoride level was determined using the standard method – Ion-Selective Electrode method. Preliminary results indicate arsenic (V) removal was below the 10 ppb and fluoride less than 1.5 ppm as prescribed by WHO. The removal efficiency was after 60-70 minutes with recyclability of 11 cycles. The nanocomposite worked well in all pH ranges 6.5-8.5. A filter cartridge biopolymer metal oxide nanocomposite constituting of template aluminium homogenized in the aggregated network of chitosan was developed as an adsorbent for fluoride from the water with better adsorption limit.
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Andala, Dickson Mubera, Erick Mobegi, Mildred Nawiri, and Geoffrey Otieno. "Fabrication of Metal Oxide-Biopolymer Nanocomposite for Water Defluoridation." In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 1264–94. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch053.

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Fluoride contamination in groundwater affects about 150 million people worldwide. In this study, the authors focused on synthesizing biopolymer metal oxide nanocomposite for fluoride removal. Nanocomposite material was done using SEM. As(V), Al, Ti, Zr, and Fe water samples were analysed by ICP-MS (inductively coupled plasma-mass spectrometry). Fluoride level was determined using the standard method – Ion-Selective Electrode method. Preliminary results indicate arsenic (V) removal was below the 10 ppb and fluoride less than 1.5 ppm as prescribed by WHO. The removal efficiency was after 60-70 minutes with recyclability of 11 cycles. The nanocomposite worked well in all pH ranges 6.5-8.5. A filter cartridge biopolymer metal oxide nanocomposite constituting of template aluminium homogenized in the aggregated network of chitosan was developed as an adsorbent for fluoride from the water with better adsorption limit.
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Kuchariková, Lenka, Eva Tillová, Juraj Belan, and Milan Uhríčik. "Porosity in Aluminum Alloy Castings." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000291.

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The inclusions and impurities (such as oxides, carbide, defect, and so on) are formed mostly during the casting process. These inclusions and impurities reduce material properties because an increase in porosity has a tendency to form failure and corrosion of aluminum alloys. The effect of porosity on the fatigue life of AlSi9Cu3 cast alloy was studied, examining the effect of porosity size, distribution, and morphology on the fatigue behavior changes, using image analysis software. A comparison of the fatigue properties was made between material casted into a metallic mold and the material casted into a sand mold under the same conditions of gravity die casting. The fatigue properties were studied on equipment Vibrophores Amsler 50–250 HFP 5100 for material casted into a metallic mold and on Rotoflex for materials casted into a sand molds. The results show that porosity has the greatest detrimental effect on fatigue life. It was found that fatigue life decreases with increasing size of the pores surface. The experimental material casted into the metallic mold had about 98.78% smaller porosity size in comparison to the material casted into the sand mold; therefore, it showed better fatigue and mechanical properties.
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Conference papers on the topic "Aluminum oxide – Analysis"

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Mamun, Md Abdulla Al, Sakib Muhammad Mohtasim, and M. N. Islam. "Property analysis of sintered porous aluminum oxide." In Proceedings of the 13th International Conference on Mechanical Engineering (ICME2019). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0037605.

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Shin, Young Bong, and Hee Chul Lee. "Residual stress analysis of anodic aluminum oxide thin films for infrared emitter device application." In Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXX, edited by Keith A. Krapels and Gerald C. Holst. SPIE, 2019. http://dx.doi.org/10.1117/12.2518815.

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Chen, Chun-Ko, and Sheng-Hui Chen. "Analysis of nano-channel array fabricated by multi-step anodic aluminum oxide method." In 2011 IEEE 4th International Nanoelectronics Conference (INEC). IEEE, 2011. http://dx.doi.org/10.1109/inec.2011.5991761.

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Hsieh, Yu-Chen, Ching-Ching Yang, Chih-Chung Yang, Yu-Hsuan Lin, Kuo-Cheng Huang, and Wen-Tse Hsiao. "Residual Stress Analysis of Aluminum-doped Zinc Oxide Films under Laser-Induced Recovery Process." In 7th International Conference on Photonics, Optics and Laser Technology. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0007363601340138.

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Khowamnuaychok, K., C. Luangchaisri, I. Chatnuntawech, and C. Muangphat. "Studies on the uniformity and hexagonality of anodic aluminum oxide by image analysis methods." In 3RD ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2017 (EGM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5002477.

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Moss, Jamey, Sam Subramanian, Vince Soorholtz, Michael Thomas, Mark Gerber, and C. M. Chan. "Failure Analysis of Autoclave-Stressed SRAMs with Aluminum Fuses." In ISTFA 1999. ASM International, 1999. http://dx.doi.org/10.31399/asm.cp.istfa1999p0293.

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Abstract Several hundred units were subjected to autoclave stress as part of the qualification of a new fast static RAM. Many units failed after autoclave stress, and these parts recovered after conventional depotting using nitric acid and a hot plate. Based on the recovery of the units, the failures were determined to be fuse-related because the nitric acid cleared the fuse cavities during depotting. Chemical analysis after thermally extracting the die from the package revealed an antimony-rich material in failing fuse cavities. Source of the antimony was linked to antimony trioxide added to the plastic package as a fire retardant. However, it was unclear whether the antimony-rich material caused the failure or if it was an artifact of thermal depotting. A new approach that did not thermally or chemically alter the fuse cavities was employed to identify the failing fuses. This approach used a combination of back-side grinding, dimpling, and back-side microprobing. The antimony-rich material found in the fuse cavity was confirmed using SEM and TEM-based EDS analysis, and it is believed to be a major contributing factor to fuse failures. However, it is unclear whether the short was caused by the antimony-rich material or by a reaction between that material and residual aluminum (oxide) left in the fuse cavity after the laser blows.
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Arminio Frech Junior, Paulo Roberto de Aguiar, Hamilton José de Mello, and Eduardo Carlos Bianchi. "ANALYSIS OF ROUGHNESS IN SYNTHETIC DIAMONDS USED IN THE SINGLE POINT DRESSING OF ALUMINUM OXIDE GRINDING WHEELS." In 23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro, Brazil: ABCM Brazilian Society of Mechanical Sciences and Engineering, 2015. http://dx.doi.org/10.20906/cps/cob-2015-0123.

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Tiari, Saeed, Mahboobe Mahdavi, Viren Thakore, and Stacy Joseph. "Thermal Analysis of a High-Temperature Heat Pipe-Assisted Thermal Energy Storage System With Nano-Enhanced Phase Change Material." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86481.

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In this study, the thermal characteristics of a high-temperature latent heat thermal energy storage system assisted by highly conductive nanoparticles and finned heat pipes are investigated numerically. A transient two-dimensional model is developed using the commercial CFD package of ANSYS-FLUENT18.2 to analyze the thermal performance of the storage unit during the charging process. Copper oxide (CuO) and aluminum oxide (Al2O3) are the nanoparticles introduced to enhance the thermal conductivity of the phase change material (PCM) which is potassium nitrate (KNO3) with melting temperature of 335°C. The effects of different types and volume fractions of nanoparticles, as well as the quantities of embedded heat pipes have been studied. The results revealed that increasing the volume fraction of nanoparticles leads to the increase of the melting rate and input heat flux of the system. It was also found that the dispersion of aluminum oxide in the PCM provides a faster charging process in comparison to the case with copper oxide nanoparticles. In addition, the results showed that the quantity of heat pipes has a significant impact on the thermal performance of the storage unit.
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Dai, S., J. P. Delplanque, E. J. Lavernia, and R. H. Rangel. "Modeling of Reactive Spray Atomization and Deposition." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0341.

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Abstract Recent experimental investigations of reactive spray deposition of aluminum alloys have indicated that oxides could not be detected for atomization gas oxygen contents lower than 10%. In order to elucidate this behavior, an analysis of the oxidation kinetics during reactive spray deposition based on the Mott-Cabrera theory of oxidation is proposed herein. A linear growth law is obtained that indicates that the oxide growth rate decreases with decreasing temperature or oxygen pressure. Furthermore, the oxide growth rate is found to decrease faster at low oxygen pressure with decreasing temperature as well as at low temperature with decreasing oxygen pressure. Calculations of the width of oxide stringers as a function of oxygen content and superheat temperature based on this analysis are in good agreement with the experimental observations.
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ANFIMOV, N., G. KARABADYAK, B. KHMELININ, Y. PLASTININ, and A. RODIONOV. "Analysis of mechanisms and the nature of radiation from aluminum oxide in different phase states in solid rocket exhaust plumes." In 28th Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-2818.

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