Find the maximum temperature to which the fol- lowing two magnesia–alumina refractory mate...

Find the maximum temperature to which the fol- lowing two magnesia–alumina refractory materials may be heated before a liquid phase will appear.

(a) A spinel-bonded alumina material of composition 95 wt% Al2O3–5 wt% MgO.

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(b) A magnesia–alumina spinel of composition 65 wt% Al2O3–35 wt% MgO. Consult Figure 10.24.

Figure 10.24 The magnesium oxide–aluminum oxide phase diagram; ss denotes solid solution.