The content of glass phase has an important influence on the production and quality of Al2O3 ceramics.
The glass phase plays a role in the bonding of the Al2O3 ceramic slabs, which together with the dispersed crystalline phases, can fill the pores in the ceramic and make the ceramic materials compact.
The glass phase can also inhibit the growth of the crystal, and prevent the crystal form change when the temperature changes.
The glass phase also has a negative effect on the ceramic. The mechanical properties of the crystal phase is lower than that of the crystalline phase, and the thermal stability is poor, and it will begin to soften at lower temperatures.
Glass structure is loose, often in the structure of the gap filled with some metal ions. Under the action of the electric field, the polarization can be easily produced, so that the insulating property of the ceramic material is decreased, and the dielectric loss is increased.