Find the maximum temperature to which the following two magnesia???alumina refractory materials may be heated before a

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Find the maximum temperature to which the following 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.

(b) A magnesia-alumina spinel of composition 65 wt% Al2O3-35 wt% MgO.

Consult Figure.

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