Protection of yttria-stabilized zirconia for dental applications by oxidic PVD coating.
Protection of yttria-stabilized zirconia for dental applications by oxidic PVD coating.
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DOI：
10.1016/j.actbio.2014.09.042
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发表时间：
2015
影响因子：
9.7
通讯作者：
C. Hübsch;P. Dellinger;H. Maier;F. Stemme;M. Bruns;M. Stiesch;L. Borchers
中科院分区：
文献类型：
--
作者：
C. Hübsch;P. Dellinger;H. Maier;F. Stemme;M. Bruns;M. Stiesch;L. Borchers
在这项研究中，氧化锆陶瓷上的透明物理气相沉积（PVD）涂层的应用进行了研究，作为一种方法，以延缓牙科应用的氧化锆的低温降解。采用磁控溅射法在标准化的3 Y-TZP片上沉积了氧化钛（TixOy）和氧化钛-氧化铝-氧化钛（TixOy-AlxOy-TixOy）的透明单层膜。使用X射线光谱和飞行时间二次离子质谱，涂层的组成进行了验证，并确定了每种类型的涂层的约50 nm的厚度。在134 °C和3巴下在水蒸气中老化涂覆和未涂覆的样品4、8、16、32、64和128小时后，使用X射线衍射测定单斜相含量，并在双轴弯曲强度测试中评估其对机械性能的影响。此外，从水热老化样品的断裂表面的扫描电子显微镜图像测量的转化区的深度。结果表明，PVD涂层的应用延缓了氧化锆陶瓷的四方相到单斜相的转变。在老化的第一阶段，涂层样品的单斜相含量显著低于未涂层样品，并且在老化128 h后，显示出仅为12-15 μm厚的转变区，而对照组中为30 μm厚。双轴弯曲强度在老化过程中下降了约10%，并且不受PVD涂层应用的影响。
In this study, the application of transparent physical vapor deposition (PVD) coatings on zirconia ceramics was examined as an approach to retard the low-temperature degradation of zirconia for dental applications. Transparent monolayers of titanium oxide (TixOy) and multilayers consisting of titanium oxide–alumina–titanium oxide (TixOy–AlxOy–TixOy) were deposited onto standardized discs of 3Y-TZP using magnetron sputtering. Using X-ray photospectroscopy and time-of-flight secondary-ion mass spectrometry, the compositions of the coatings were verified, and an approximate thickness of 50 nm for each type of coating was ascertained. After aging the coated and uncoated samples in water vapor at 134 °C and 3 bar for 4, 8, 16, 32, 64 and 128 h, the monoclinic phase content was determined using X-ray diffraction, and its impact on mechanical properties was assessed in biaxial flexural strength tests. In addition, the depth of the transformation zone was measured from scanning electron microscopy images of the fracture surfaces of hydrothermally aged samples. The results revealed that the tetragonal-to-monoclinic phase transformation of the zirconia ceramic was retarded by the application of PVD coatings. During the first stages of aging, the coated samples exhibited a significantly lower monoclinic phase content than the uncoated samples and, after 128 h of aging, showed a transformation zone which was only ∼12–15 μm thick compared to ∼30 μm in the control group. Biaxial flexural strength decreased by ∼10% during aging and was not influenced by the application of a PVD coating.