Keuper Melanie, Berthold Christoph, Nickel Klaus Georg
Eberhard Karls University Tuebingen, Faculty of Science, Department of Geosciences, Applied Mineralogy, Wilhelmstraße 56, 72074 Tuebingen, Germany.
Eberhard Karls University Tuebingen, Faculty of Science, Department of Geosciences, Applied Mineralogy, Wilhelmstraße 56, 72074 Tuebingen, Germany.
Acta Biomater. 2014 Feb;10(2):951-9. doi: 10.1016/j.actbio.2013.09.033. Epub 2013 Oct 1.
We present new findings on the low-temperature degradation of yttria-stabilized zirconia at 37°C over several years and at high and low partial pressures of water. With the aid of focused ion beam cross-section confirmation studies we are able to show an extensive linear, continuous degradation without retardation, even at low temperatures and low water pressures. The characteristic layer growth and its inferred rate constant imply a lifetime of tens of years under simple tension and open the possibility of studying the longevity of these ceramics more rigorously. In addition, we show reproducibility complications of accelerated aging tests by the use of different autoclaves and possible implications for standardized procedures.
我们展示了关于氧化钇稳定氧化锆在37°C下、数年时间里以及在高、低水分压条件下低温降解的新发现。借助聚焦离子束截面确认研究，我们能够表明，即使在低温和低水压下，也会发生广泛的线性、持续降解且无延缓现象。特征层生长及其推断的速率常数意味着在简单拉伸下其寿命可达数十年，并为更严格地研究这些陶瓷的寿命提供了可能性。此外，我们展示了使用不同高压釜进行加速老化试验时的可重复性问题以及对标准化程序可能产生的影响。
