Ceramic Physics Laboratory & Research Institute for Nanoscience, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, Kyoto, Japan.
Biomaterials. 2010 Sep;31(27):6901-8. doi: 10.1016/j.biomaterials.2010.05.035. Epub 2010 Jun 30.
The aim of this paper is to clarify at the nanometer scale the relevant factors influencing the hydrothermal resistance to polymorphic transformation of alumina/zirconia composites, primary candidates for artificial joint applications. The topographic distribution of oxygen vacancies and lattice strain on the composite surface were visualized by means of cathodoluminescence spectroscopy and mapped as a function of exposure time in a thermally activated water vapor environment (i.e., simulating the exposure in human body). Systematically monitoring the optical activity of oxygen vacancies in both alumina and zirconia phases also revealed the effect of surface lattice strain accumulation on the kinetics of polymorphic transformation. From the presented data, an explicit role is evinced for surface oxygen vacancy formation in the alumina matrix, an important step in the complex cascade of mechanochemical events determining the superior environmental resistance of the composite.
本文旨在从纳米尺度上阐明影响氧化铝/氧化锆复合材料水热抗多晶转变的相关因素，这些复合材料是人工关节的主要候选材料。通过阴极发光光谱法对复合材料表面的氧空位和晶格应变的形貌分布进行可视化，并在热激活水汽环境中（即模拟人体暴露环境）作为暴露时间的函数进行映射。系统监测氧化铝和氧化锆相中氧空位的光学活性，也揭示了表面晶格应变积累对多晶转变动力学的影响。从所呈现的数据中，可以明显看出氧化铝基体中氧空位的形成在决定复合材料优异环境阻力的复杂机械化学事件级联中起着重要作用。
