用于生物医学应用的氧化锆-氧化铝复合材料的寿命估计。
Lifetime estimation of a zirconia-alumina composite for biomedical applications.
作者信息
Fabbri Paride, Piconi Corrado, Burresi Emiliano, Magnani Giuseppe, Mazzanti Francesca, Mingazzini Claudio
机构信息
Faenza Technical Unit on Material Technologies (UTTMATF), ENEA, Faenza, Italy.
GHIMAS S.p.A. MeLab, Brindisi, Italy; Institute of Orthopedics and Traumatology, Catholic University, Roma, Italy.
出版信息
Dent Mater. 2014 Feb;30(2):138-42. doi: 10.1016/j.dental.2013.10.006. Epub 2013 Nov 15.
OBJECTIVES
In this work long term stability of a zirconia toughened alumina (ZTA) composite was investigated.
METHODS
Accelerated aging tests under hydrothermal environment, in autoclave and hot water, at different temperature, was conducted on material sample. Tetragonal to monoclinic transformation was evaluated by XRD analysis and the monoclinic content was plot as a function of the exposure time. The kinetic of transformation was studied by means Mehl-Avrami-Johnson (MAJ) nucleation and growth model.
RESULTS
An activation energy for tetragonal to monoclinic transformation of 99 kJ/mol was found by the Arrhenius plot of reaction rate, value in agreement with other bibliography works regarding Y-TZP and alumina-zirconia composites. The in vivo hydrothermal stability simulation, estimated by the obtained activation energy, predicts in 65 years the time necessary to reach 25 vol% of monoclinic phase.
SIGNIFICANCE
These results support the material suitability in biomedical field, especially in dentistry applications as implantology.
目的
在本研究中，对氧化锆增韧氧化铝（ZTA）复合材料的长期稳定性进行了研究。
方法
对材料样品在不同温度下于高压釜和热水中的水热环境下进行加速老化试验。通过X射线衍射分析评估四方相向单斜相的转变，并将单斜相含量绘制成暴露时间的函数。通过Mehl-Avrami-Johnson（MAJ）成核和生长模型研究转变动力学。
结果
通过反应速率的阿累尼乌斯图发现四方相向单斜相转变的活化能为99 kJ/mol，该值与其他关于钇稳定四方氧化锆多晶体（Y-TZP）和氧化铝-氧化锆复合材料的文献报道一致。根据获得的活化能估算的体内水热稳定性模拟结果预测，在65年内达到25体积%单斜相所需的时间。
意义
这些结果支持了该材料在生物医学领域的适用性，特别是在牙科植入等牙科应用中。
Zotero 插件