Semi Solid Processing
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Effect of Pouring Temperature and Water Cooling on the Thixotropic Semi-solid Microstructure of A319 Aluminium Cast Alloy
The cooling slope (CS) casting is the simplest and cheapest technique for producing feedstock materials with non-dendritic microstructure. Such materials are required for semi-solid metal (SSM) processing methods such as thixoforming. In the present investigation, the effect of the pouring temperature and the water cooling on the thixotropic microstructure o
Mat. Res.. Publicado em: 2015-02
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2. Analysis of semi-solid processing for metal matrix composite synthesis using factorial design
The main goal in this work is to conduct a quantitative analysis of the mechanical stir casting process for obtaining particulate metal matrix composites. A combined route of stirring at semi-solid state followed by stirring at liquid state is proposed. A fractional factorial design was developed to investigate the influence and interactions of factors as: t
Materials Research. Publicado em: 31/01/2012
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3. Produção de biogás a partir de glicerol oriundo de biodiesel / Biogas production from glycerol generated on biodiesel industry
The Brazilian legislation demands the use of biodiesel mixed with diesel in an increasing rate. This raise on biodiesel production implies also on an increase on generation of glycerol, which is a liquid or semi-solid waste with high concentration of salts (approximately 46.1 g\ CL POT.-\ /L) and organic matter (1260 gCOD/L in average). Despite being widely
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2011
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4. Discriminação entre estádios de maturação e tipos de processamento de pós-colheita de cafés arábica por microextração em fase sólida e análise de componentes principais
A fruit chemical composition reflects its maturation stage. For coffee, it is also the reflex of the post-harvesting processing type, dry, semi-wet and wet. The object of this work was to verify if headspace solid phase microextraction coupled to gas chromatography (HS-SPME-GC) could be used to discriminate between samples harvested in different maturation s
Química Nova. Publicado em: 2011
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5. Composição do leite e diagnóstico de mastite em caprinos) = Milk composition and mastitis diagnosis in goats / Milk composition and mastitis diagnosis in goats
Background: Milk is one of the most used foodstuffs by humans in their diet. The quality of goat milk is already regulated by Law, which takes into consideration its physical-chemical and microbiological composition parameters. Several factors contribute for the alteration of the physical-chemical and microbiological parameters of caprine milk. These include
Publicado em: 2011
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6. Nanofibres characterization through image processing techniques. / Caracterização de nanofibras através de técnicas de processamento de imagens.
The electrospinning technique represents a simple and convenient process to provide polymers and ceramics bers with both solid and hollow interiors that are exceptionally long in length, uniform in diameter, varying within the interval of few nanometers to several microns, and diversied in composition. Despite the versatility and potencially the scanning ele
Publicado em: 2009
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7. Study of the potencial of national and argentinean bentonites to obtasin organophilic bentonites in aqueous dispersion and semi-solid medium to be applied in polymer nanocomposite / Estudo do potencial de bentonitas nacionais e argentinas na obtenção de bentonitas organofilicas em dispersão aquosa e meio semi-solido visando a aplicação em nanocompositos polimericos
Seven bentonites were evaluated to verify the potential to obtain the organophilic clay. The characterization by X-ray diffraction to evaluate the basal spacings was made, as well as the characterization by swelling capacity test, in water and in xylene, to evaluate the hydrophilic and organophobic character, by X-ray dispersive energy to indentify the prese
Publicado em: 2009
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8. Analysis of the application potentiality of nodular cast iron ASTM A536 60-40-18 as raw material for thixoforming processes / Estudo da potencialidade da aplicação do ferro fundido nodular ASTM A536 60-40-18 como materia prima para processos de tixoconformação
This work analyses the thixoability, the viability of actual production of thixotropic semi-solid of ferritic nodular cast iron ASTM A536 60-40-18, as well as the phase transformations taking place in the process. Thixoability evaluation is made through thermal analysis by Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC) tests
Publicado em: 2009
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9. Estudo da viabilidade de produção de esponjas da liga A2011 a partir do estado semi-solido / Study of the feasibility of production of A2011 sponges from the alloy in semi-solid state
The work analyses the possibility of the production of cellular material by pressing the A2011 alloy in the thixotropic semi-solid state, into a space holder pre-form. Space holder particles used are NaCl, which are removed from the product after the forming operation, resulting the porous material. It is investigated the influence of the thixoforming temper
Publicado em: 2006
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10. Estudo de variáveis de composição e processo para controle da compressibilidade
Brake pads for automotive brake systems represent one of the most complex composite materials since they contain many components with widely varying physical and chemical properties. This multiphase nature is necessary to satisfy a wide variety of performance related demands. Processing conditions also have a major influence on the properties of these comple
Publicado em: 2006
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11. Citric acid production by solid-state fermentation on a semi-pilot scale using different percentages of treated cassava bagasse
Citric acid is commercailly important product used in several industrial processes. Solid-state fermentation (SSF) has become an alternative method for citric acid production using agro-industrial residues such as cassava bagasse (CB). Use of CB as substrate can avoid the environmental problems caused by its disposal in the environment. The aim of this work
Brazilian Journal of Chemical Engineering. Publicado em: 2005-12
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12. Study about the drawability, in the solid state, of the thixocast A5052 aluminium alloy and the viability of its thixodrawing / Estudo sobre a estampabilidade, no estado solido, da liga de aluminio A5052 tixofundida, e viabilidade da sua tixoestampagem
This work presents an analysis of the viability of drawing A5052 sheets in the semisolid state. Initially, to produce thixocast sheets, rolled commercial sheets were submitted to partial melting by different temperatures and holding times, to analyse the sheets draw ability in the solid state. The parameters utilised were: 627°C for 5 and 10 minutes, and 63
Publicado em: 2005