Lee, DY Kim, DJ Song, YS 2024-01-21T13:33:36Z 2024-01-21T13:33:36Z 2021-09-05 2000-09-30 0921-5093 https://pubs.kist.re.kr/handle/201004/141088 Tetragonal (t) zirconia-alumina composites were prepared by adding Al2O3 into t-ZrO2 solid solutions doped with Y2O3 and Nb2O5 ((Y,Nb)-TZP/Al2O3). The effect of Fe2O3 addition on chromaticity, hydrothermal stability, and mechanical properties of the composites was investigated by adding Fe2O3 in 0.1 mol% intervals in the range of 0.1-0.5 mol%. Although monolithic (Y,Nb,Fe)-TZPs containing more than 0.2 mol% Fe2O3 showed t --> m phase transformation after autoclaving for 20 h at 180 degrees C under 3.5 MPa water vapor pressure, no m-ZrO2 was observed for the aged (Y,Nb,Fe)-TZP/Al2O3 composites containing 0-0.5 mol% Fe2O3, probably due to the preferential solid solubility of Fe2O3 in Al2O3, the presence of the rigid Al2O3 particles, and the inherent phase stability of (Y,Nb)-TZP. The optimized strength and the fracture toughness of (Y,Nb,Fe)-TZP/Al2O3 composites were 700 MPa and 8.5 MPa m(1/2), respectively, when 0.1 mol% of Fe,O, was added. Both monoliths and composites showed a gradual color change from a slight white ivory to a pale yellowish brown with increasing the Fe,O, concentration. (C) 2000 Elsevier Science S.A. All rights reserved. English ELSEVIER SCIENCE SA TEMPERATURE PHASE-STABILITY FRACTURE-TOUGHNESS Y-TZP ZIRCONIA CERAMICS Y2O3 Chromaticity, hydrothermal stability, and mechanical properties of t-ZrO2/Al2O3 composites doped with yttrium, niobium, and ferric oxides Article 10.1016/S0921-5093(00)00937-0 1 MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.289, no.1-2, pp.1 - 7 MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 289 1-2 1 7 scie scopus 000088628300001 2-s2.0-0034273530 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Metallurgy & Metallurgical Engineering Article TEMPERATURE PHASE-STABILITY FRACTURE-TOUGHNESS Y-TZP ZIRCONIA CERAMICS Y2O3 tetragonal zirconia composite chromaticity hydrothermal stability