Aluminium Oxide
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Mechanical properties and morphological characteristics of ARALL reinforced with TRGO doped epoxy resin
ABSTRACT Mechanical properties in tension, bending, fatigue and lap-shear in two different proportions (0.5%wt and 1%wt) of TRGO (Thermally Reduced Graphite Oxide) doped ARALL (Aramid Aluminium Laminate) were examined. The materials and their failure modes were characterized morphologically by examination through SEM (Scanning Electron Microscopy). Some mech
Matéria (Rio J.). Publicado em: 06/12/2018
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2. Mechanical properties and morphological characteristics of ARALL reinforced with TRGO doped epoxy resin
ABSTRACT Mechanical properties in tension, bending, fatigue and lap-shear in two different proportions (0.5%wt and 1%wt) of TRGO (Thermally Reduced Graphite Oxide) doped ARALL (Aramid Aluminium Laminate) were examined. The materials and their failure modes were characterized morphologically by examination through SEM (Scanning Electron Microscopy). Some mech
Matéria (Rio J.). Publicado em: 06/12/2018
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3. Evaluation of kaolin and bauxite from the Amazonian region addition on mechanical-, physical-, chemical properties and microstructural characterization of red ceramic industry clay of Manaus metropolitan region
ABSTRACT The present work investigated properties of red ceramic from the Amazonian region after the addition of kaolin and bauxite mixture with 0, 10, 20 and 30%wt. in red ceramic industry clay. Assessed mechanical properties were flexural strength and Young's modulus. The assessed physical properties were density and porosity. The microstructural images we
Matéria (Rio J.). Publicado em: 18/10/2018
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4. NON-CRYSTALLINE COPPER OXIDE HIGHLY DISPERSED ON MESOPOROUS ALUMINA: SYNTHESIS, CHARACTERIZATION AND CATALYTIC ACTIVITY IN GLYCEROL CONVERSION TO ACETOL
Polymeric precursor method and wet impregnation route were applied to synthesize copper and aluminium-based catalysts in order to obtain a material with interesting properties in catalytic reactions. The changes in the structural, morphological and textural properties due to the choice of preparation method were characterized by different techniques, such as
Quím. Nova. Publicado em: 2016-07
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5. Aluminothermic reduction of Cr2O3 contained in the ash of thermally treated leather waste
In this study the viability of utilising ashes with high chromium oxide content, obtained by thermal treatment of footwear leather waste, in the production of low-carbon ferrochromium alloy (Fe-Cr-LC) by aluminothermic reduction was investigated. The following key-factors were selected for process modelling: the quantity of aluminium (Al) employed in the rea
Braz. J. Chem. Eng.. Publicado em: 2013-03
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6. Nanocompósitos de epóxi reforçados com nanopartículas de óxido de alumínio (Alfa Alumina) ou óxido de titânio (Titânia) / Epoxy nanocomposites reinforced by aluminium oxide (alfa alumina) or titaniun oxide (titane) nanoparticles
Recentes pesquisas têm demonstrado que a adição de pequenas quantidades de nanopartículas a uma matriz pode afetar significativamente suas propriedades. Neste trabalho foram estudadas as propriedades de nanocompósitos de matriz epóxi aditivadas com duas concentrações nanopartículas de alumina alfa ou óxido de titânio (2,5% m/m e 5,0%m/m). O objeti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/11/2011
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7. Low temperature synthesis of magnesium oxide and spinel powders by a sol-gel process
Magnesium oxide and magnesium aluminate (MgAl2O4) spinel (MAS) powders have been synthesized by a simple aqueous sol-gel process using citrate polymeric precursors derived from magnesium chloride, aluminium nitrate and citrate. The thermal decomposition of the precursors and subsequent formation of cubic MgO and MAS were investigated by X-ray diffraction (XR
Materials Research. Publicado em: 2010-09
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8. Caracterização de sistemas cerâmicos aluminizados infiltrados por vidro, por meio de microscopia eletrônica de varredura e resistência à flexão / Characterization of glass-infused alumina-based ceramic systems by means of scanning electron microscopy and flexural strength
Objective: The purpose of this study was to characterize and compare glass-infused alumina-based ceramic systems by using X-Ray diffraction, scanning electron microscopy (SEM) and flexural strength with a three-point bending test. The ceramic systems used were: (IC)- In-Ceram Alumina (VITA), (VC)- Vitro-Ceram (Angelus) and (AG)- Alglass (Celmat). The c
Publicado em: 2009
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9. Luminescence dosimeter based on magnesium doped aluminum oxide: production and characterization. / Confecção e caracterização de dosímetro luminescente de óxido de alumínio dopado com magnésio.
The aim of the present work is to obtain and characterize luminescent dosimeters made of magnesium doped aluminium oxide, for ionizing radiation dosimetry purposes. The material is produced by Pechini Method (US Patent 3.330.697, 1967), starting from a polymer that generates powder ceramic, after firing at predetermined temperatures. Dosimetric measurements
Publicado em: 2008
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10. Comparative study of the adaptation between metallic copings and alumina, in system In-Ceram, before and after cementation / Estudo comparativo da adaptação entre copings metalicos e de alumina, no sistema In-Ceram, antes e apos cimentação
The purpose of this study was to evaluate the marginal fit before and after cementation of metal and aluminium oxide In-Ceram copings, on bovine teeth preparation using two kinds of cement. Sixty bovine incisors were embedded in resin and the coronal portions of the teeth were prepared to receive complete crowns usin a 4103 diamond bur under refrigeration wi
Publicado em: 2007
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11. Productive flexibilizacion and local development: the net of subcontração of the Alunorte / Flexibilização produtiva e desenvolvimento local : a rede de subcontração da Alunorte
This dissertation examines the creation of a network of service companies, subcontracted by Alunorte, as a consequence of the production flexibility process of the alumina industry, located in the industrial sector of the city of Barcarena, State of Pará. The main goal of the present study is to analyze if the relations established between the big industry
Publicado em: 2006
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12. Óxido misto de ítrio-alumínio dopado com Eu(III)
In this work, we report the synthesis and the photoluminescence features of Eu(III)-doped yttrium-aluminium oxide obtained by non-hydrolytic sol-gel routes. After heating the powders above 600 ºC the XRD patterns show the presence of the Y4Al2O9 (YAM) and Y3Al5O12 (YAG) phases. At 800 and at 1500 ºC the PL spectra display the Eu(III) lines characteristic o
Química Nova. Publicado em: 2005-03