Y-TZPの表面改質による熱劣化の改善

概要

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Y-TZP has both high siterablity and superior mechanical properties, but the fracture strength is degraded by annealing at such low temperatures as 100〜300℃. In order to improve the heat degradation of TZP containing 3 mol%-Y_2O_3, 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(NO_3)_3 solution using a suitable brush and subsequently firing at 1400℃ in air to decompose the infiltrant and to densify the powder compact. Y-TZP surface-modified by infiltration of Y(NO_3)_3 solution did not show the tetragonal to monoclinic zirconia transformation after aging in hot water of 200℃ 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.
社団法人日本材料学会の論文
1991-07-15