Abstract
We describe a new method for processing Si 3N 4mulliteAl 2O 3 nanocomposites by reaction sintering of the green compacts after partial oxidation treatment. Bimodal powder compacts used in this process were prepared by a colloidal filtration method. Si 3N 4 and Al 2O 3 powders were dispersed in aqueous suspensions at pH=10 with the aid of an electrosteric stabilizer, polymethacrylic acid. A binary mixture of Al 2O 3 powder was used to attain high green densities. This process results in the following morphology: nanometer-sized Si 3N 4 particles that are distributed in the mullite phase which is embedded in an Al 2O 3 matrix.
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