Abstract
In this work, compositions containing transparent glass bottles and banana leaves (desiccated and crushed), with different mass fractions (30-50%), were prepared for obtaining cellular materials for thermal insulation purposes. The formulated and prepared compositions were uniaxially pressed (10 MPa) and the compact powders fired between 700 and 850°C for 30 min in order to investigate the effect of the banana leaves on the formation of pores and on the thermal and mechanical properties of the processed glass foams. The results indicated that the obtained glass foams with porosities between 58.5 and 87.5%, compressive strength ranging between 1.17 and 3.50 MPa and thermal conductivity ranging between 0.06 and 0.15 W/mK, are potential candidates to work as thermal insulators with appropriate properties for a specific application.
Highlights
Several different materials can be used for the manufacture of porous ceramics such as alumina, mullite, silicon carbide, zirconia and hydroxyapatite
The use of glass foams is viable in applications involving temperatures lower than 500 °C, for example in thermal insulation systems used in building such as panels, blocks, roofs, fireplaces, grills, among others[1]
As observed, combining the techniques of dilatometry and differential scanning calorimetry (DSC), it can follow the thermal behavior of the transparent glass bottle (TGB)
Summary
Several different materials can be used for the manufacture of porous ceramics such as alumina, mullite, silicon carbide, zirconia and hydroxyapatite. The use of glass foams is viable in applications involving temperatures lower than 500 °C, for example in thermal insulation systems used in building such as panels, blocks, roofs, fireplaces, grills, among others[1]. These materials are characterized by high porosity (> 60% vol.) which can be opened, closed or mixed. The distribution and amount of pores determine specific properties, such as low density and thermal conductivity, high surface area, permeability and chemical and thermal stability[1,4,5]. Glass foams have mechanical strength and chemical and thermal stabilities greater than the polymeric foams typically employed in such cases[1,6,7]
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