Temperature Dependence of the Elastic Moduli of Monoclinic Zirconia

Chan, S. H.; Fang, Y.; Grimsditch, M.; Li, Zhuang; Nevitt, M. V.; Robertson, W. M.; Zouboulis, E. S.

doi:10.1111/j.1151-2916.1991.tb07177.x

Cited by 115 publications

(35 citation statements)

References 6 publications

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“…The obtained values of the parameters of EOS are summarized in Table I together with previous data from x-ray diffraction 14,15 and Brillouin scattering experiments. 28 Consequently, both Samples 1 and 2 indicate negative large values of K 0 , 3(1), and 4(2), respectively. The obtained EOS from all of the pressure-volume data of both the samples also showed negative K 0 of 3.6(6) and K 0 of 159(3) GPa; the obtained EOS is plotted in the figure as a solid line.…”

Section: -4mentioning

confidence: 99%

“…The lattice compression usually tends TABLE I. Parameters of the equation of state for each sample of the monoclinic phase of ZrO 2 : the volume of ZrO 2 (unit cell volume/Z) at ambient pressure V 0 , the bulk modulus K 0 , and pressure derivative of bulk modulus K 0 together with previous data from x-ray diffraction 14,15 and Brillouin scattering experiments. 28 Sample to weaken the covalent bonds for oxides. Therefore, the abnormal softening may be a result of a change in the chemical bonding properties.…”

Section: -4mentioning

confidence: 99%

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Observation of the negative pressure derivative of the bulk modulus in monoclinic ZrO2

et al. 2018

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Using synchrotron radiation x-ray diffraction techniques, the equation of state of monoclinic ZrO2 has been investigated under a hydrostatic pressure condition at 298 K. Monoclinic ZrO2 transformed to the orthorhombic I phase at between 5.7 and 7.0 GPa. Lattice constants of monoclinic ZrO2 refined from the Reitveld analysis showed extreme anisotropic pressure dependence. From the pressure–volume data, using least-squares fit of the Birch–Murnaghan formula, the bulk modulus, K0 and its pressure derivative: K0′, were estimated to be 159(3) GPa and −3.6(6), respectively. A negative K0′ suggests the abnormal softening of the elastic modulus in monoclinic ZrO2 with compression. First-principles calculations supported present experimental results.

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Section: -4mentioning

confidence: 99%

Section: -4mentioning

confidence: 99%

Observation of the negative pressure derivative of the bulk modulus in monoclinic ZrO2

et al. 2018

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“…[6], such changes were ascribed to the presence of the microcracks network, which reduces the contact stiffness. In fact, if it is accepted that the elastic modulus of monoclinic zirconia is similar to tetragonal zirconia or few tens of GPa higher [26,27], the sole phase change cannot explain the observed variation.…”

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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“…Indeed, the elastic stiffness S(x) at the grain level is strongly anisotropic [27], with a Young modulus E ranging from 106 GPa to 328 GPa depending on the direction of loading with respect to the monoclinic crystal lattice. The local stress can be linked with the macroscopic one using a stress concentration tensor B(x)…”

Section: Discussionmentioning

confidence: 99%

Neutron diffraction measurements of residual stress distribution in large zirconia based refractory bricks produced by electro-fusion and casting

Örs

Gouraud

Guinebretière

et al. 2017

Journal of the European Ceramic Society

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a b s t r a c tElectro-fusion and casting is used to produce large refractory bricks (∼250 kg) containing a high amount of ZrO 2 . These bricks are used in glass-making furnaces where good mechanical performance is required at very high temperatures (>1500• C). During the manufacturing procedure, they develop large residual stresses as a result of the cooling conditions and structural phase transformations they underwent. This leads to stress concentration and crack formation at different length scales. In order to characterize these phenomena, a 'multi-scale' analysis approach is under development, where different internal strain measurement methods are combined. In this approach we benefit from different gauge volumes provided by various diffraction methods, ranging from a few hundred nanometres to a few tens of millimetres. In the present paper, the results of neutron diffraction measurements on large ZrO 2 blocks are given. These results show the level of internal strains at the millimetre scale, based on (311) reflection of the monoclinic ZrO 2 . Overall, a range of 0.025% tensile to 0.1% compressive strain was observed. Clear strain gradients were also visible, as larger values in the interior of the block were encountered.

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Temperature Dependence of the Elastic Moduli of Monoclinic Zirconia

Cited by 115 publications

References 6 publications

Observation of the negative pressure derivative of the bulk modulus in monoclinic ZrO2

Observation of the negative pressure derivative of the bulk modulus in monoclinic ZrO2

Micropillar compression inside zirconia degraded layer

Neutron diffraction measurements of residual stress distribution in large zirconia based refractory bricks produced by electro-fusion and casting

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