In this paper, Al2O3 ceramics with sintering additives, Y2O3 and SiC were prepared. SiC were added at 10, 15 and 20 wt.%, Respectively. Y2O3 was constant at 3 wt.%. The specimens were carried out the heat treatment for 0.5 hr, 1 hr, and 10 hrs at three different temperatures (1473 K, 1573 K and 1673 K). In acidic solution, the hardness of the corroded AS10 specimen was similar to regardless of the temperature at 0.5 hr and 1 hr. The probability distribution of 10 hrs was decreased than asreceived specimen as temperature increase. The corroded AS15 specimen for 0.5 hr was similar except to the highest 1673K. The 1673 K-1hr and 10hrs specimens showed the lowest probability distribution, but others were similar. The probability distribution of the corroded AS20 specimens for 0.5 hr and 1hr were similar regardless of temperature. The probability distribution of 10h decreased as temperature increase. In alkaline solution, the hardness of the corroded AS10 specimen at 0.5 hr was similar to regardless of the temperature. The probability distribution of 1 hr and 10hrs had large dispersion as temperature increase. The corroded AS15 and AS20 specimen for 1 hr and 10hrs was smaller than the corroded as-received specimen. The compositions of Al2O3 ceramic were found to be corroded by acidic and alkaline solutions. The shape parameters and scale parameters of the Weibull statistical analysis can be used to predict the life of the alumina ceramics.

Keywords: Al2O3 ceramics, SiC weight ratio, Heat treatment time and temperature, Corrosion, Vickers hardness, Weibull statistical analysis.