Focused ion beam tomography of zirconia degraded under hydrothermal conditions

Jiménez‐Piqué, E.; Ramos, Alfeu Saraiva; Muñoz-Tabares, J.A.; Hatton, Alexandra; Soldera, F.; Mücklich, Frank; Anglada, M.

doi:10.1016/j.jeurceramsoc.2012.02.011

Cited by 32 publications

(15 citation statements)

References 26 publications

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“…However, several studies recently showed that the orientation of microcracks was not favourable for water penetrating. Although the extent of microcracking increased as the transformation zone grew [16,18,21], the thickness of the transformation layer was larger than the thickness of the layer in which microcracks were detected and the microcracking networks on the degraded layer tended to orient parallel to the surface, suggesting that microcracking was not a rapid route for water to reach the transformation front [16,18,35]. In this work, residual stress mapping in the subsurface region of aged 3Y-TZP clearly showed tensile stress accumulation at the transformation front (Fig.…”

Section: Linear Kineticsmentioning

confidence: 98%

Lifetime estimation of zirconia ceramics by linear ageing kinetics

et al. 2015

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Section: Linear Kineticsmentioning

confidence: 98%

Lifetime estimation of zirconia ceramics by linear ageing kinetics

et al. 2015

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“…It was observed by TEM that degradation microcracks develop anisotropically, with the crack planes mainly orientated along planes roughly parallel to the free surface [11]. The spatial distribution of microcracks in the degraded volume was also measured by means of focused ion beam (FIB) tomography [12], confirming the anisotropic distribution.…”

Section: Introductionmentioning

confidence: 69%

“…Since the cylindrical micropillars have been milled with their axis perpendicular to the degraded surface and degradation microcracks are roughly parallel to the original surface exposed to aging [12,22], a high proportion of them are orientated along planes perpendicular to the compression axis. However, since these cracks are entirely intergranular, they follow the orientation of grain boundaries, so the local crack orientation ranges over different angles with the stress axis.…”

Section: Discussionmentioning

confidence: 99%

Micropillar compression inside zirconia degraded layer

Camposilvan

Anglada

2015

Journal of the European Ceramic Society

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In the dental field, Yttria-doped Tetragonal Polycrystalline Zirconia (Y-TZP) plays an important role due to its high mechanical properties, good aesthetics and bio-inert behavior. Surface mechanical properties are crucial for Y-TZP especially when it comes to osseointegration or contact loading, since it may undergo a spontaneous aging phenomenon when exposed to humid environment, creating a thin degraded layer that affects surface integrity. In this work, polished samples of Y-TZP have been artificially aged, and micropillars with diameters in the range 3.3 μm -0.3 μm have been milled by FIB inside the degraded layer and in the reference non-aged surface. Reproducible stress-strain curves were obtained by testing the micropillars in compression, demonstrating that this technique is suitable for assessing the degraded surface properties. Mechanical and failure behavior are significantly different for the degraded micropillars due to the presence of microcracks, while important differences are observed when reducing the micropillar diameter.

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“…Considering the length scale of microstructural features of hardmetals, FIB tomography emerges as a quite interesting technique as it provides reconstructions in the order a few microns in volume and with resolutions in the order of some nanometers, i.e. very suitable for characterization of phases [31], damage [32] or microcracks [33].…”

Section: Introductionmentioning

confidence: 99%

Focused ion beam tomography of WC-Co cemented carbides

Jiménez‐Piqué

Turon-Viñas

Chen

et al. 2017

International Journal of Refractory Metals and Hard Materials

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The microstructure of three different grades of WC-Co cemented carbides has been reconstructed in three dimensions after sequential images obtained by focused ion beam.The three-dimensional microstructual parameters are compared against the well-know two-dimensional parameters of grain size, phase percentages and mean free path. Results show good agreement with the exception of individual grain recognition, which could not be univocally segmented. In the case of mean free path, the three-dimensional image depicts a more realistic image of the metal interconnections in the composite.For the grade with coarser grain size, the obtained tomography is translated in a finite element modelling mesh, and elastic residual stresses are estimated from sintering to room temperature. Calculated thermal stresses agree with experimental results and show significant local variations in their value due to the complex microstructure of cemented carbides.

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Focused ion beam tomography of zirconia degraded under hydrothermal conditions

Cited by 32 publications

References 26 publications

Lifetime estimation of zirconia ceramics by linear ageing kinetics

Lifetime estimation of zirconia ceramics by linear ageing kinetics

Micropillar compression inside zirconia degraded layer

Focused ion beam tomography of WC-Co cemented carbides

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