Influence of processing parameters on the microstructure of the eco‐friendly glass foam

Abstract

Among the several e-waste (electronic and electrical waste) generated, one of the most worrisome are those derived from fluorescent lamps. 1 Although these lamps class are one of the most popular sources of light, its recycling is still marginal. 1,2 Recycled glass-based scrap can greatly reduce the energy and raw material required to produce new materials, such as glass foams (GF). [3][4][5][6][7] The production of this material is an economically attractive alternative for glass recycling. 6,7 GF are highly porous materials produced by the addition of a foaming agent (FA) to the glass powder followed by a heat treatment for gas release by the FA to enable the pores formation throughout the vitreous matrix. 4,5,8 The low thermal conductivity, dimensional stability, low bulk density, non-flammable, and higher operating temperatures than

Glass foam of high compressive strength produced from photovoltaic module waste glass, eggshell, and clay

“…18 This oxide will thermally decompose into CaO and CO 2 to give the porous structure to the GFs. 6,[8][9] From Figure 1, the presence of two zones of mass loss of the white eggshell is observed: the first zone, beginning from ca. 250 • C and ending at ca.…”

“…28 In this condition, CO 2 was retained in the glass structure and consequently produced the porous structure of the GFs. 8 Figure 3 and Figure S2 present the respective microstructures and macrostructures of the GFs. From Figures 2A and 3A,D, it is possible to state that 90G10E has heterogeneous distribution as well as average pore diameter of .07 ± .001 mm and .125 ± .002 mm for temperatures of 750 and 800 • C, respectively.…”

“…This observation, however, did not favor the development of the GF. 8,13 For a low percentage of clay (5%), inclusion of clay favored ceramic body's expansion. The 85G10E5C sample achieved larger volumetric expansion of 95% ± 2.62% and 114% ± 5.24% at 750 and 800 • C, respectively (Figure 2B).…”

“…The thermal conductivity of GF is affected by factors such as the size and shape of the pores of the material as well as the thermal conductivities of both the inner fluid of the pores and the glass matrix. 8,13 Small pore sizes as well as low thermal conductivities of the fluid inside the pores and glass matrix, tend to reduce the heat transfer rate of GFs. 8,13 Additionally, porosity can influence the heat transfer phenomenon through GFs.…”

“…In recent years, different glass-based scraps have been used for production of GFs. The majority of the studies on porous ceramic materials focused on the potential of recycling glass, [6][7][8][9] and others on the possibility of producing materials with different thermal properties. [10][11][12][13] When evaluating insulation of ceramic materials, mechanical properties are usually ignored.…”