화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.85, No.8, 2102-2106, 2002
Relationship between transformation temperature and time-temperature-transformation curves of tetragonal-to-monoclinic martensitic transformation in zirconia-yttria system
The tetragonal --> monoclinic (t --> m) martensitic phase transformation in ZrO2-0.5-4 mol% Y2O3 proceeds during isothermal aging at various temperatures from 350 to 800 K; i.e., the transformation increases sigmoidally with aging time. The time-temperature-transformation (T- T- T) curves show a typical C shape, with very high rate for lower Y2O3-content specimens, and the rate decreases with higher Y2O3 content. The transformation temperature (M.) of the t --> m transformation obtained from dilatation curves during the cooling stage coincides well with C curves above the nose temperature. The t --> m transformation should occur isothermally, as suggested by a nucleation and growth mode.