1991 Volume 40 Issue 454 Pages 927-933
Y-TZP has both high sinterability and superior mechanical properties, but the fracture strength is degraded by annealing at such low temperatures as 100-300°C. In order to improve the heat degradation of TZP containing 3mol%-Y2O3, a fabrication technique for surface modification of TZP was developed. The method consists of infiltrating a porous powder compact with open porosity of about 53% by the application of Y(NO3)3 solution using a suitable brush and subsequently firing at 1400°C in air to decompose the infiltrant and to densify the powder compact.
Y-TZP surface-modified by infiltration of Y(NO3)3 solution did not show the tetragonal to monoclinic zirconia transformation after aging in hot water of 200°C for 100 hours at all even through the examination by thin film X-ray diffraction. Therefore, this infiltration technique may prove to be very valuable when designing TZP for structural applications.