Abstract
In this paper attempt was made to study the simultaneous effects of alumina type, antioxidant wt% and sintering temperature on Permanent Linear Change (PLC) behavior of Alumina-Magnesia-Graphite refractories. Using Box-Behnken experimental design, by taking different weight percentages of brown fused alumina, calcined bauxite and Al-antioxidant into account, 13 compositions and sintering temperatures for different samples were prepared. Three different statistical and econometric models have been proposed to estimate the PLC of all different compositions. In addition, further investigations show that the cubic regression model can significantly estimate and forecast the PLC behavior of all tested and none tested samples. XRD results indicate that the amount of spinel phase has decreased with increasing the addition of brown fused alumina at the expense of calcined bauxite as well as increasing Al-antioxidant wt%.
Keywords
)