Upon consideration of the SiO₂-Al₂O3 phase diagram, Figure 12.27, for each pair of the fol- lowing list of compositions,

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Upon Consideration Of The Sio Al O3 Phase Diagram Figure 12 27 For Each Pair Of The Fol Lowing List Of Compositions 1 (38.29 KiB) Viewed 21 times

Upon consideration of the SiO₂-Al₂O3 phase diagram, Figure 12.27, for each pair of the fol- lowing list of compositions, which would you judge to be the more desirable refractory? Justify your choices. (a) 20 wt% Al₂O3-80 wt% SiO₂ and 25 wt% Al₂O3-75 wt% SiO₂ (b) 70 wt% Al₂O3-30 wt% SiO₂ and 80 wt% Al₂O3-20 wt% SiO₂