The use of Larson–Miller parameters to monitor the evolution of Raman lines of tetragonal zirconia with high temperature aging

Limarga, Andi M.; Iveland, Justin; Gentleman, Molly M.; Lipkin, Don M.; Clarke, David R.

doi:10.1016/j.actamat.2010.10.049

Cited by 40 publications

(27 citation statements)

References 20 publications

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“…The sense of the shift suggests that the tetragonal phase is under tension, in accordance with the observation in Ref. [46]. By implication, the cubic phase would be under compression.…”

Section: Discussionsupporting

confidence: 77%

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Effect of phase transformations on the fracture toughness of t′ yttria stabilized zirconia

Loganathan

Gandhi

2012

Materials Science and Engineering: A

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“…The sense of the shift suggests that the tetragonal phase is under tension, in accordance with the observation in Ref. [46]. By implication, the cubic phase would be under compression.…”

Section: Discussionsupporting

confidence: 77%

“…The peak at $ 260 cm À 1 shifted to higher wave numbers. The shift of these Raman peaks has been interpreted as the manifestation of strain in the tetragonal phase [46].…”

Section: Fracture Toughness Variation With Thermal Exposurementioning

confidence: 99%

Effect of phase transformations on the fracture toughness of t′ yttria stabilized zirconia

Loganathan

Gandhi

2012

Materials Science and Engineering: A

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“…Several transmission electron microscopy (TEM) studies have corroborated this interpretation, but others have revealed microstructural evidence suggestive of spinodal decomposition . A recent Raman spectroscopy study further substantiates the latter perspective …”

Section: Introductionmentioning

confidence: 87%

“…Previous attempts to characterize phase evolution in both electron beam physical vapor deposition (EBPVD) and air‐plasma spray (APS) TBCs have employed a wide range of analytical techniques. Among these are X‐ray (XRD) and neutron diffraction, Raman spectroscopy, and electron microscopy . Although each of these techniques offers a unique perspective on the process, they are rarely used in conjunction, resulting in incongruous interpretations of t′ phase stability.…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution upon Aging of Air‐Plasma Sprayedt′‐Zirconia Coatings: I—Synchrotron X‐Ray Diffraction

et al. 2012

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Phase evolution accompanying the isothermal aging of free‐standing air‐plasma sprayed (APS) 7–8 wt% yttria‐stabilized zirconia (8YSZ) thermal barrier coatings (TBCs) is described. Aging was carried out at temperatures ranging from 982°C to 1482°C in air. The high‐temperature kinetics of the phase evolution from the metastable t′ phase into a mixture of transformable Y‐rich (cubic) and Y‐lean (tetragonal) phases are documented through ambient temperature X‐ray diffraction (XRD) characterization. A Hollomon–Jaffe parameter (HJP), T[27 + ln(t)], was used to satisfactorily normalize the extent of phase decomposition over the full range of times and temperatures. Comparison to vapor deposited TBCs reveal potential differences in the destabilization mechanism in APS coatings. Furthermore, the lattice parameters extracted from Rietveld refinement of the XRD patterns were used to deduce the stabilizer concentrations of the respective phases, which suggest a retrograde tetragonal solvus over the temperature range studied. In concert with a complementary microstructural study presented in Part II, this effort offers new insights into the mechanisms governing the phase evolution and raises implications for the high‐temperature use of 8YSZ ceramics.

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“…This is represented schematically on the zirconia-rich portion of the zirconia-yttria phase diagram reproduced in figure 8. (Recent TEM observations and our previous Raman shift data [16] suggest that the phase decomposition is a coherent transformation so the lines will be slightly modified from those in figure 8). In essence, with high-temperature aging, phase separation by diffusion of the Y 3+ and oxygen vacancies occurs creating a two-phase composite consisting of a mixture of tetragonal and cubic phases.…”

Section: Effect Of Phase Decomposition On Thermal Conductivitymentioning

confidence: 99%

Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia

et al. 2012

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The thermal conductivity of yttria-stabilized zirconia (YSZ) thermal barrier coatings increases with high temperature aging. This common observation has been attributed to the densification of the coatings as porosity sinters out and pores and cracks spheroidize to minimize their surface energy. We show that the thermal conductivity of fully-dense 3 mol% Y 2 O 3 stabilized zirconia (3YSZ) also increases with high temperature aging, indicating that densification and pore shape changes alone are not responsible for all the observed increase in thermal conductivity of coatings. Instead, there are increases due to a combination of phase separation and grain growth. The increase in thermal conductivity can be described by a LarsonMiller parameter. It is also found that the increase in thermal conductivity with aging is greatest when measured at room temperature and decreases with increasing measurement temperature. At 1000 o C, the thermal conductivity is almost temperature independent and the changes in thermal conductivity with aging are less than 15%, even after aging for 50 hours at 1400 o C.

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The use of Larson–Miller parameters to monitor the evolution of Raman lines of tetragonal zirconia with high temperature aging

Cited by 40 publications

References 20 publications

Effect of phase transformations on the fracture toughness of t′ yttria stabilized zirconia

Effect of phase transformations on the fracture toughness of t′ yttria stabilized zirconia

Phase Evolution upon Aging of Air‐Plasma Sprayedt′‐Zirconia Coatings: I—Synchrotron X‐Ray Diffraction

Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia

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