抄録
Based on the isotropic growth law, GSn-GS0n=Kt, the n-value of high purity Al2O3 was found to be n=2.4 during sintering, and to be n=3 at annealing stage after reaching the theoretical density. The grain growth rates, K-values, of pure Al2O3 and of Al2O3 doped with additives were evaluated; for example, K (Al2O3) =5.11×10-22 (m3/s) at 1400°C. The influence of ten inorganic additives on the isotropic grain growth law, the pinning effect of the secondary phase on the grain boundaries, and pore elimination are also discussed.
