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- Title
Phase stability after aging and its influence on pin-on-disk wear properties of Ce-TZP/Al<sub>2</sub>O<sub>3</sub> nanocomposite and conventional Y-TZP.
- Authors
Kenji Tanaka; Jiro Tamura; Keiichi Kawanabe; Masahiro Nawa; Masaki Uchida; Tadashi Kokubo; Takashi Nakamura
- Abstract
Recently zirconia/alumina composites have been examined by many researchers as the new generation of bearing materials in total joint replacements. In this study, the phase stability of a Ce-TZP/Al2O3 nanocomposite and conventional Y-TZP after aging, and its influence on wear resistance, were investigated. Very slight phase transformation was observed in both types of ceramics 18 months after the implantation of Ce-TZP/Al2O3 or Y-TZP samples into rabbit tibiae. However, Y-TZP showed marked phase transformation (approximately 80%) after aging in an autoclave (121°C) for 190 h or in physiological saline at 62°C for 18 months, whereas the new composite remained almost resistant to degradation. According to the results of self-pairing pin-on-disk wear tests using ceramic specimens with or without autoclave aging, the wear factor was almost the same between Ce-TZP/Al2O3 samples with and without aging (6.74 ± 0.36 × 10-8 and 6.04 ± 0.95 × 10-8 mm3/Nm, respectively). In contrast, although non-aged Y-TZP had the lowest wear factor (4.88 ± 0.51 × 10-8 mm3/Nm) of all specimens tested, aged Y-TZP showed 10-fold greater wear than nonaged Y-TZP. The present study suggests that Ce-TZP/Al2O3 nanocomposite has much greater phase stability than Y-TZP, and that its wear properties are not influenced by aging. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res 67A: 200207, 2003
- Subjects
ZIRCONIUM oxide; ALUMINUM oxide; COMPOSITE materials; CERAMICS
- Publication
Journal of Biomedical Materials Research, Part A, 2003, Vol 67, Issue 1, p200
- ISSN
1549-3296
- Publication type
Article
- DOI
10.1002/jbm.a.10006