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A Novel Processing Route for Alumina/Mullite-Based Refractory Materials

It makes use of a dissolution process of aluminium isopropylate and a subsequent, but slow increase of the pH value in the processing solution by stepwise addition and decomposition of urotropine. The pH value increase results in a precipitation of aluminium hydroxide, and in the presence of mullite particles and alumina particles a homogeneous solid body is formed after hydrolysis and drying. While it is not possible to obtain intact samples without alumina addition the combined presence of alumina and mullite particles lead to intact and crack-free parts even after sintering at 1650 °C.


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