HlP処理(Y,Ce)-TzP/Al_2O_3複合体の機械的強度と水熱条件下の相安定性に及ぼす組成の影響

概要

論文の詳細を見る
The effect of alumina content and composition of tetragonal zirconia (TZP) on the fracture strength and hydrothermal stability of (Y,Ce)-TZP/Al_2O_3 composites HIPped at 1400°to 1600℃ under 147 MPa for 0.5 h in Ar were studied. (Y, Ce)-TZP/Al_203 composites HIPped at 1400℃ exhibited the maximum density and maximum bending strength. The mean values of bending strength of HIPped (Y, Ce)-TZP/Al_2O_3 composites were 1800 MPa for (4Y, 4Ce)-TZP/25 wt%Al_2O_3 composites, 1700 MPa for (2.5Y, 4Ce)-TZP/25 wt%AI_2O_3 composites, and 1600 MPa for (2.5Y, 5.5Ce)-TZP/25 wt%Al_2O_3 composites. The phase stability of HIPped (Y, Ce)-TZP/Al_2O_3 composites under hydrothermal conditions at 180℃ and 1 MPa increased with increasing alumina content. Dispersion of Al_2O_3 into (Y, Ce)-TZP was useful to enhance the bending strength, to suppress the tetragonal→monoclinic phase transformation and grain growth of zirconia and to improve the resistance to low-temperature degradation.
社団法人日本セラミックス協会の論文
1991-05-01