Sintering behavior of Cr2O3–Al2O3 ceramics

We investigated the sintering behavior of Cr2O3–Al2O3 ceramic materials. In our observation of the isothermal shrinkage behavior of Cr2O3–Al2O3 ceramic, the activation energy of sintering reaction was measured to be 102 kJ/mol, that is, the near value of the activation energy of diffusion of Al ions in Al2O3 single crystal. Therefore the diffusion of cations is believed to control the sintering behavior of this material. With the addition of TiO2, (the compound chosen to accelerate the diffusion of cations) to Cr2O3–Al2O3, the sintering behavior was accelerated.