It is argued that the sintering and densification of Si3N4 based ceramics, using transition metal or rare earth metal oxide additives, can be described as an electronic mechanism involving a transfer of electrons into the Si3N4–SiO2 valence band: this is consistent with a recently proposed model of bonding at metal/ceramic interfaces. Transition metal/rare earth metal oxides with a ‘metallic’ character tend to aid densification during sintering of Si3N4–β sialon whereas insulator type metal oxides are less effective densifiers. MST/1855.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering