We describe a new method for processing Si3N4mulliteAl2O3 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. Si3N4 and Al2O3 powders were dispersed in aqueous suspensions at pH=10 with the aid of an electrosteric stabilizer, polymethacrylic acid. A binary mixture of Al2O3 powder was used to attain high green densities. This process results in the following morphology: nanometer-sized Si3N4 particles that are distributed in the mullite phase which is embedded in an Al2O3 matrix.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics