Low thermal conductivity without oxygen vacancies in equimolar YO1.5+TaO2.5- and YbO1.5+TaO2.5-stabilized tetragonal zirconia ceramics

Shen, Yonghang; Leckie, Rafael M.; Levi, Carlos G.; Clarke, David R.

doi:10.1016/j.actamat.2010.04.040

Cited by 91 publications

(46 citation statements)

References 17 publications

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“…Furthermore, both Raghavan [6] and Shen et al [10] have demonstrated that compositions along the ZrO2-YTaO4 join have especially low thermal conductivity provided the transformation to monoclinic zirconia is prevented from occurring. The low thermal conductivities are attributed to the extensive mass disorder associated with compositions along the join.…”

Section: Introductionmentioning

confidence: 99%

“…Materials having compositions lying in the two-phase field between the co-doped tetragonal ZrO2 and the orthorhombic 'O' phase were found to partially transform on cooling and consequently, they were not studied further. Also shown in Figure 1 are compositions whose thermal conductivities have been reported elsewhere [10,12,13]. Compositions within the fluorite single-phase field were also not explored since their thermal conductivities have already been reasonably well studied [14] and were found earlier to have lower fracture toughness [15].…”

Section: Introductionmentioning

confidence: 99%

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Thermal conductivity of single- and multi-phase compositions in the ZrO2–Y2O3–Ta2O5 system

Limarga

Shian

Leckie

et al. 2014

Journal of the European Ceramic Society

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117

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Compositions in the ZrO2-Y2O3-Ta2O5 system are of interest as low thermal conductivity, fracture resistant oxides for the next generation thermal barrier coatings (TBC). Multiple phases occur in the system offering the opportunity to compare the thermal properties of single, two-phase, and three-phase materials. Despite rather large variations in compositions almost all the solid solution compounds had rather similar thermal conductivities and, furthermore, exhibited only relatively small variations with temperature up to 1000 o C. These characteristics are attributed to the extensive mass disorder in all the compounds and, in turn, small interfacial Kapitza (thermal) resistances. More complicated behavior, associated with the transformation from the tetragonal to monoclinic phase, occurs on long-term annealing in air of some of the compositions. However, the phases in two of the compositional regions do not change with annealing in air and their thermal conductivities remain unchanged suggesting they may be suitable for further exploration as thermally stable TBC overcoats.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of single- and multi-phase compositions in the ZrO2–Y2O3–Ta2O5 system

Limarga

Shian

Leckie

et al. 2014

Journal of the European Ceramic Society

Self Cite

117

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“…It has been shown that doping of YSZ with sub-tetravalent oxides could further reduce thermal conductivity of YSZ as it leads to the formation of oxygen vacancies that strongly scatter phonons [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

Kulczyk-Malecka

Zhang

Carr

et al. 2016

Surface and Coatings Technology

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Influence of embedded MoSi 2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings, Surface & Coatings Technology (2016), doi:10.1016/j.surfcoat.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D Abstract:To prolong the lifetime of thermal barrier coatings (TBCs) recently a new method of microcrack healing has been developed, which relies on damage initiated thermal decomposition of embedded molybdenum disilicide (MoSi 2 ) particles within the TBC matrix.While these MoSi 2 particles have a beneficial effect on the structural stability of the TBC, the high thermal conductivity of MoSi 2 may have an unfavourable but as yet unquantified impact on the thermal conductivity of the TBCs.In this work the thermal conductivity of spark plasma sintering (SPS) produced yttria-

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“…More recently, in a series of papers, Levi and colleagues have elaborated on the phase stabilities in the zirconia-rich portion of the phase diagram, more clearly delineating the phase fields and relating some of the physical properties such as fracture toughness and thermal conductivity to the phase content. [3,4] They have also explicitly considered the opportunities for phases in this system as prospective thermal barrier coatings. [5] Much less is known about the phase fields in the vicinity of YTaO4 and reference to the phase diagram compilations of the American Ceramic Society [6] indicates that along the Y2O3-Ta2O5 join there are two other phases, YTa3O9 and Y3TaO7, in addition to YTaO4.…”

Section: Introductionmentioning

confidence: 99%

The tetragonal–monoclinic, ferroelastic transformation in yttrium tantalate and effect of zirconia alloying

et al. 2014

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Oxide compositions of equimolar YO1.5 and TaO2.5 in the Y-Ta-Zr-O system have attractive properties for high temperature applications including as thermal barrier coatings. The effect of zirconia concentration, from 0 to 20 mole percent cation, on the tetragonal to monoclinic phase transition has been studied using high temperature X-ray diffraction, Raman spectroscopy, and electron microscopy. The transformation is reversible and the temperature variation of an order parameter based on the spontaneous strain is consistent with the transformation being ferroelastic, a critical feature for toughening at high temperatures. The presence of twin domains further supports this conclusion. Additionally, stabilization of the tetragonal phase with increasing ZrO2 is evident from the amount of partially retained tetragonal phase at room temperature.2

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Low thermal conductivity without oxygen vacancies in equimolar YO1.5+TaO2.5- and YbO1.5+TaO2.5-stabilized tetragonal zirconia ceramics

Cited by 91 publications

References 17 publications

Thermal conductivity of single- and multi-phase compositions in the ZrO2–Y2O3–Ta2O5 system

Thermal conductivity of single- and multi-phase compositions in the ZrO2–Y2O3–Ta2O5 system

Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

The tetragonal–monoclinic, ferroelastic transformation in yttrium tantalate and effect of zirconia alloying

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