TY - JOUR
T1 - Mechanical properties and low-temperature aging of tetragonal zirconia polycrystals processed by hot isostatic pressing
AU - Muñoz-Saldaña, J.
AU - Balmori-Ramírez, H.
AU - Jaramillo-Vigueras, D.
AU - Iga, T.
AU - Schneider, G. A.
N1 - Funding Information:
The authors thank Consejo Nacional de Ciencia y Tec-nología (CONACYT), and coordinación general de pos-grado e investigación-Instituto Politécnico Nacional (CGPI-IPN), for financial support of this project. The assistance of M. Machida from National Industrial Research Institute of Nagoya (NIRIN) to perform the hot isostatic pressing (HIP) experiments, T. Scholz for the nanoindentation experiments, and of N. Claussen and M. Swain for helpful discussion is greatly appreciated.
PY - 2003/10
Y1 - 2003/10
N2 - The influence of grain size and density of yttria-tetragonal zirconia polycrystals (Y-TZPs) ceramics on mechanical properties and on low-temperature aging degradation (LTD) in air and in hot water was investigated. A TZP powder containing 3 mol% Y2O3 was consolidated by slip casting and densified by the sintering/hot isostatic pressing (HIP) method. Only the presintered samples that contained less than 0.15% open porosity reached near full density after HIP. The best conditions to reach full density were found to be attained by presintering and HIP both at 1400 °C. At these conditions, some of the best mechanical properties such as modulus of rupture and Weibull modulus reached 1397 ± 153 MPa and, 10.6, respectively. These values were clearly higher than those obtained from sintered bodies and samples hot isostatically pressed at 1600 °C. Aging degradation of 3Y-TZP materials can be avoided through microstructural design. Fully dense materials with a critical grain size <0.36 μm did not show any evidence of degradation after extreme aging conditions at pressurized autoclaving in hot water at 100, 200, and 260 °C for 8 h. We propose a criterion to predict degradation in air as well as in hot water for the characterized materials based on the microstructure and density control of the samples.
AB - The influence of grain size and density of yttria-tetragonal zirconia polycrystals (Y-TZPs) ceramics on mechanical properties and on low-temperature aging degradation (LTD) in air and in hot water was investigated. A TZP powder containing 3 mol% Y2O3 was consolidated by slip casting and densified by the sintering/hot isostatic pressing (HIP) method. Only the presintered samples that contained less than 0.15% open porosity reached near full density after HIP. The best conditions to reach full density were found to be attained by presintering and HIP both at 1400 °C. At these conditions, some of the best mechanical properties such as modulus of rupture and Weibull modulus reached 1397 ± 153 MPa and, 10.6, respectively. These values were clearly higher than those obtained from sintered bodies and samples hot isostatically pressed at 1600 °C. Aging degradation of 3Y-TZP materials can be avoided through microstructural design. Fully dense materials with a critical grain size <0.36 μm did not show any evidence of degradation after extreme aging conditions at pressurized autoclaving in hot water at 100, 200, and 260 °C for 8 h. We propose a criterion to predict degradation in air as well as in hot water for the characterized materials based on the microstructure and density control of the samples.
UR - http://www.scopus.com/inward/record.url?scp=0242575980&partnerID=8YFLogxK
U2 - 10.1557/JMR.2003.0337
DO - 10.1557/JMR.2003.0337
M3 - Artículo
SN - 0884-2914
VL - 18
SP - 2415
EP - 2426
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 10
ER -