- Rua Professor Aristídes Novis, 02 - Federação - Zip Code: 41210-630 - Salvador - BA - Brazil
- +55 71 997040099
- UFSCar - Federal University of São Carlos, DEMa, Graduate Studentadd
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O processo de fundição mais rápido, econômico e convencional é o de moldagem em areia a verde, onde o ligante principal é uma argila umedecida (bentonita). Entretanto, devido a exigências tecnológicas, são utilizados também ligantes... more
O processo de fundição mais rápido, econômico e convencional é o de moldagem em areia a verde, onde o ligante principal é uma argila umedecida (bentonita). Entretanto, devido a exigências tecnológicas, são utilizados também ligantes tóxicos como resinas furânicas, fenólicas ou uretânicas. Novas tecnologias vêm sendo desenvolvidas para a recuperação e inertização das areias, porém as resinas disponíveis atualmente têm como limitação "ecológica" sua origem química. Após sua utilização estes moldes são descartados, e assim, os ligantes tóxicos tornam-se um problema ambiental. Desta maneira, a substituição destes ligantes por compostos orgânicos derivados de fontes renováveis como a resina poliuretana derivada do óleo de mamona minimiza os impactos ambientais, conduzindo o processo de fundição rumo à sustentabilidade, necessária devido ao aumento do rigor da legislação ambiental. Devido ao comportamento térmico do poliuretano vegetal, que se decompõem de maneira mais acentuada...
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The geopolymers (inorganic polymers formed basically of silicates) have attracted increasing attention from academia for several reasons, particularly because it is considered a sustainable material where industrial by-products (fly ash... more
The geopolymers (inorganic polymers formed basically of silicates) have attracted increasing attention from academia for several reasons, particularly because it is considered a sustainable material where industrial by-products (fly ash and blast furnace slag) can be used as raw material, and is based on a low energy cost process. Such materials find applications in virtually all industrial sectors, depending on the molar ratio Si:Al, responsible for its properties. Currently the application of large volumes of geopolymers is focused on replacement of Portland cement, a material with an extremely aggressive process of obtaining to the environment. However, due to their similar properties to the ceramic material and increase search for new applications, studies of porous geopolymers are also of great interest. Processing routes currently used to obtain porous geopolymers are based on the civil construction for the production of aerated concrete with closed porosity, limiting their ap...
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Effect of mixing speed and surfactant content on total porosity With the aim of evaluate the effect the rotation speed and of the surfactant content on total porosity, two amounts of surfactant were used. Figure 3.A (left) is for samples... more
Effect of mixing speed and surfactant content on total porosity With the aim of evaluate the effect the rotation speed and of the surfactant content on total porosity, two amounts of surfactant were used. Figure 3.A (left) is for samples containing 2 wt% of surfactant (Tween 80) and Figure 3.B (right) shows how porosity changed with the addition of 4 wt% of surfactant. For both surfactant contents, the total porosity produced was measured for three different speed rotation, as 800, 1500 and 2000 rpm. After these preliminary experiments, all studies were conducted on samples with 68 wt% solid content. Fig. 3 also shows the morphology of samples produced using either 2 (left) or 4 (right) wt% of Tween 80 surfactant (mixing speed = 1500 rpm). Highly porous foams possessing fully interconnected pores were produced by this method.