Phase stability after aging and its influence on pin-on-disk wear properties of Ce-TZP/Al2O3 nanocomposite and conventional Y-TZP.
Phase stability after aging and its influence on pin-on-disk wear properties of Ce-TZP/Al2O3 nanocomposite and conventional Y-TZP.
复制标题
Ce-TZP/Al2O3 纳米复合材料和传统 Y-TZP 老化后的相稳定性及其对销盘磨损性能的影响。
DOI：
10.1002/jbm.a.10006
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Takashi Nakamura
中科院分区：
文献类型：
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作者：
Kenji Tanaka;J. Tamura;K. Kawanabe;M. Nawa;M. Uchida;T. Kokubo;Takashi Nakamura
近年来，氧化锆/氧化铝复合材料作为新一代全关节置换术的承载材料受到了许多研究者的研究。研究了Ce-TZP/Al(2)O(3)纳米复合材料与常规Y-TZP时效后的相稳定性及其对耐磨性的影响。Ce-TZP/Al(2)O(3)或Y-TZP植入兔胫骨18个月后，两种陶瓷均出现了非常轻微的相变。然而，Y-TZP在高压灭菌器（121℃）中老化190小时或在62℃的生理盐水中老化18个月后，表现出明显的相变（约80%），而新复合材料几乎保持抗降解性。采用高压灭菌器时效或不时效的陶瓷试样进行自配对销盘磨损试验结果表明，Ce-TZP/Al(2)O(3)试样的磨损因子与未时效的陶瓷试样几乎相同(分别为6.74 +/- 0.36 × 10（-8）和6.04 +/- 0.95 × 10（-8) mm(3)/Nm）。相比之下，尽管未时效Y-TZP的磨损系数最低(4.88 +/- 0.51 x 10(-8) mm(3)/Nm)，但时效Y-TZP的磨损程度是未时效Y-TZP的10倍。研究表明，Ce-TZP/Al(2)O(3)纳米复合材料的相稳定性远高于Y-TZP，且其磨损性能不受时效的影响。
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/Al(2)O(3) 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/Al(2)O(3) or Y-TZP samples into rabbit tibiae. However, Y-TZP showed marked phase transformation (approximately 80%) after aging in an autoclave (121 degrees C) for 190 h or in physiological saline at 62 degrees 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/Al(2)O(3) samples with and without aging (6.74 +/- 0.36 x 10(-8) and 6.04 +/- 0.95 x 10(-8) mm(3)/Nm, respectively). In contrast, although non-aged Y-TZP had the lowest wear factor (4.88 +/- 0.51 x 10(-8) mm(3)/Nm) of all specimens tested, aged Y-TZP showed 10-fold greater wear than nonaged Y-TZP. The present study suggests that Ce-TZP/Al(2)O(3) nanocomposite has much greater phase stability than Y-TZP, and that its wear properties are not influenced by aging.