The sinterabilities of fine zirconia powders including 5mass% Y2O3 were investigated with emphasis oh the effect of Al2O3. The powders were pressed into a disk and sintered at 1300-1500°C in air. With a small amount of Al2O3, high-density sintered bodies were obtained at a low temperature. The shrinkage of powder compact in the course of heating was measured by a dilatometric method, indicating that the powder compact including a small amount of Al2O3 increased the densification rate. The activation energies of sintering were determined by analyzing the densification curves. The activation energy for initial stage of sintering decreased by including a small amount of Al2O3. It is, therefore, concluded that the effect of Al2O3 increased the densification rate because of decreasing the activation energy for initial stage of sintering.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering