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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Phase stability after aging and its influence on pin-on-disk wear properties of Ce-TZP/Al_2O_3 nanocomposite and conventional Y-TZP
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Phase stability after aging and its influence on pin-on-disk wear properties of Ce-TZP/Al_2O_3 nanocomposite and conventional Y-TZP

机译：老化后的相稳定性及其对Ce-TZP / Al_2O_3纳米复合材料和常规Y-TZP的针盘磨损性能的影响

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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_2O_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_2O_3 or Y-TZP samples into rabbit tibiae. However, Y-TZP showed marked phase transformation (approximately 80 percent) after aging in an autoclave (121 deg C) for 190 h or in physiological saline at 62 deg 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_2O_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_2O_3 nanocomposite has much greater phase stability than Y-TZP, and that its wear properties are not influenced by aging.
机译：最近，许多研究人员已将氧化锆/氧化铝复合材料作为全关节置换中的新一代轴承材料进行了研究。在这项研究中，研究了Ce-TZP / Al_2O_3纳米复合材料和常规Y-TZP老化后的相稳定性及其对耐磨性的影响。在将Ce-TZP / Al_2O_3或Y-TZP样品植入兔胫骨中18个月后，两种陶瓷都观察到非常轻微的相变。然而，Y-TZP在高压釜（121摄氏度）中老化190小时或在生理盐水中于62摄氏度下老化18个月后，表现出明显的相变（约80％），而新的复合材料几乎保持了抗降解的能力。根据使用带有或不带有高压釜老化的陶瓷样品的自配对针盘磨损测试的结果，带有和不带有老化的Ce-TZP / Al_2O_3样品之间的磨损系数几乎相同（6.74 +-0.36 X 10〜 （-8）和6 04 +-0 95 X 10〜（-8）mm〜3 / Nm）。相比之下，尽管未老化的Y-TZP的磨损系数最低（4.88±0.51 X 10〜（-8）mm〜3 / Nm），但老化的Y-TZP的磨损比未老化的Y-TZP高10倍Y-TZP。本研究表明，Ce-TZP / Al_2O_3纳米复合材料的相稳定性比Y-TZP大得多，并且其磨损性能不受老化的影响。

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