Abstract
Powders of ZrO 2Al 2O 3 synthesized by spray pyrolysis of aqueous solutions of nitrates have been subjected to high-pressure rapid-heating compaction at 700–900 C. The original amorphous phase undergoes decomposition during heat treatment via a series of metastable crystalline solid solutions to the equilibrium phases of monoclinic ZrO 2 and α-alumina. The application of high pressure results in a substantial decrease in the temperature required for each transformation. Maximum densification during pressure-assisted sintering appears to occur at the lowest temperature (700 C), in which the predominant phase is a tetragonal ZrO 2Al 2O 3 solid solution, with a small amount of partitioned γ-alumina. Under these optimum conditions, the crystalline size is 10–20 nm with no evidence of porosity.
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