Abstract
Ceramic foams were prepared from ceramic tile polishing waste and fly ash with borax as a fluxing agent at 925 °C. The foaming mechanism of SiC and the effects of borax on the mechanical properties, cellular morphology, and phase composition were investigated. The addition of 18 wt% borax lowered the sintering temperature by 300 °C and accelerated the passive oxidation of SiC, thus promoting the foaming process. The optimum ceramic foam obtained at 925 °C featured a homogenous porous structure, with an average pore diameter, low bulk density, high compressive strength, and high porosity of 1.20 mm, 0.55 g/cm3, 7.8 MPa, and 79.4%, respectively. The excellent mechanical properties make ceramic foams potential candidates for lightweight panels for partition walls and ceiling tiles in building applications.
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