Abstract
Class F flyash has been sintered by microwave and conventional processes. The sintering was carried out in a temperature range of 800 to 1000 °C. Densities up to 2.2 g/cm 3, and diametral tensile strength up to 26 MPa (corresponding diametral compressive strength 78 MPa) were achieved after sintering for 10–20 min. The microwave sintered samples were denser and thus stronger than the samples conventionally sintered at the same temperature for the same time. The sintered bodies are glass-ceramic material, with mullite (Al 6Si 2O 13) as the major crystalline phase.
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