Corundum ceramics with a eutectic zinc-bearing additive

The sintering specifics of ceramics based on aluminum oxide with a eutectic zinc-containing additive are investigated. It is established that introduction of 1% sintering additive in the GLMK alumina makes it possible at 1450°C to obtain ceramics with zero open porosity, a mean density of 3.84 g/cm3, and a bending strength of 310 ± 40 MPa. This ceramics has a sealed porosity of around 1% and an average size of corundum crystals equal to 5 – 8 μm.