Exp. No T1(°C) T2(°C) t2(h) 10%alumina 25%alumina 50% alumina 1 1150 1000 4 81.19 80.30 74.39 2 1150 1050 8 82.51 80.35 74.83 3 1150 1100 12 83.03 83.16 74.11 4 1200 1000 8 83.43 82.76 75.31 5 1200 1050 12 84.28 84.32 75.74 6 1200 1100 4 86.09 83.00 74.75 7 1250 1100 12 79.94 82.62 75.63 8 1250 1050 4 79.61 80.65 75.56 9 1250 1100 8 82.22 84.11 76.31

Table 2: Design of experiments by Taguchi method accompany with the values of composites density corresponding to each experiment.