医用氧化锆陶瓷老化的渗流机理
Percolative Mechanism of Aging in Zirconia-Containing Ceramics for Medical Applications
摘要：
近年来，氧化锆陶瓷全髋关节假体股骨头断裂的几起事件引起了医学界和科学界对氧化锆假体老化问题的关注。这种骨折会立即引起局部组织反应，需要紧急医疗干预以防止进一步的并发症。因此，氧化铝和氧化铝/Y-TZP陶瓷替代氧化钇稳定氧化锆（Y-TZP）髋关节假体已被推广。在本研究中，我们发现了氧化铝/Y-TZP复合材料中Y-TZP浓度的上限（16 vol. %）以避免将来的衰老问题。这一限制与一系列氧化铝/Y-TZP复合材料的红外（IR）反射率测量的逾渗阈值相一致。
英文摘要：
Recently, several episodes of fracture of zirconia ceramic femoral heads of total hip prostheses have alarmed the medical and scientific community regarding aging problems in zirconia prostheses. Such fractures cause immediate local tissue reactions, which require urgent medical intervention to prevent further complications. As a result, it has been promoted that yttria-stabilized zirconia (Y-TZP) hip prostheses be substituted by alumina and alumina/Y-TZP ceramics. In the present investigation, we have found an upper limit of Y-TZP concentration in alumina/Y-TZP composites (16 vol.%) to avoid future aging problems. This limit coincides with the percolation threshold measured by infrared (IR) reflectance in a series of alumina/Y-TZP composites.
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