Grain-growth rate constant of hot-pressed alumina ceramics

Pure alumina ceramics was prepared by hot pressing to investigate the process of grain growth. The relationship between densification and grain growth was shown and the grain-growth rate constants at different applied pressures were determined by the grain-growth law employed and the experimental results obtained. It was concluded that the grain-growth rate constant decreased with increasing applied pressure, but the difference of the constant under different pressures was slight when the applied pressures were high enough for obtaining high density. (C) 2000 Elsevier Science B.V. All rights reserved.