Grain-Size-Dependent Thermal Transport Properties in Nanocrystalline Yttria-Stabilized Zirconia

Yang, Ho‐Soon; Thompson, L. J.; Bai, G. R.

doi:10.1557/proc-703-v4.7

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…(2) has been widely used to study the ETC for many nanocrystalline materials238910111213, in fact, its value calculated by Eq. (2) is usually larger than almost all of the experimental or simulated values3912.…”

mentioning

confidence: 99%

Relative importance of grain boundaries and size effects in thermal conductivity of nanocrystalline materials

Dong

Wen

Melnik

2014

Sci Rep

170

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A theoretical model for describing effective thermal conductivity (ETC) of nanocrystalline materials has been proposed, so that the ETC can be easily obtained from its grain size, single crystal thermal conductivity, single crystal phonon mean free path (PMFP), and the Kaptiza thermal resistance. In addition, the relative importance between grain boundaries (GBs) and size effects on the ETC of nanocrystalline diamond at 300 K has been studied. It has been demonstrated that with increasing grain size, both GBs and size effects become weaker, while size effects become stronger on thermal conductivity than GBs effects.

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mentioning

confidence: 99%

Relative importance of grain boundaries and size effects in thermal conductivity of nanocrystalline materials

Dong

Wen

Melnik

2014

Sci Rep

170

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“…In the classical Kapitza formalism, the lattice thermal conductivity is linked to the average grain size as follows:

{normalλ}_{lat .}^{} = {normalλ}_{lat .}^{\infty} {()(, 1 + R_{K}^{} λ_{normallat .}^{\infty} \cdot \frac{1}{〈d〉})}^{- 1}

…”

Section: Theoretical Modeling Of the Grain Size Dependence Of The Latmentioning

confidence: 99%

“…These models are based on the Debye approximation of phonon density of state and connect R GB to the overlap between the phonon dispersion at the grain‐boundary interface. However, these models fail to predict R GB , in particular at the high‐temperature limit . Nevertheless, in some cases, the acoustic mismatch and diffuse mismatch models can define, respectively, upper and lower limits of R GB .…”

Section: Introductionmentioning

confidence: 99%

“…However, these models fail to predict R GB , in particular at the high-temperature limit. 7,8 Nevertheless, in some cases, the acoustic mismatch and diffuse mismatch models can define, respectively, upper and lower limits of R GB . Recently, Crocombette and Gelebart 9 predicted R GB of silicon carbide, based on a combination of molecular dynamic and finite element calculations.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Grain Boundaries on the Lattice Thermal Transport Properties of Insulating Materials: A Predictive Model

Gheribi¹,

Chartrand²

2014

J. Am. Ceram. Soc.

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We present two theoretical models to predict the lattice thermal conductivity degradation of insulating materials at high temperature (above one‐third of the Debye temperature). This degradation is due to the presence of grains, with known sizes and shapes, inducing thermal resistance at their boundaries. The first model is derived directly from the kinetic theory of gases (KTG). The formulation of the second is based on a localized continuum model (LCM), assuming phonon Umklapp scattering and the Debye approximation of phonon density of state. The two proposed models are purely predictive, as no experimental information related to the grain size dependence of the thermal conductivity is necessary for the parameterization of the models. The predictive accuracy of the two proposed models is tested on several different types of electrically insulating compounds. Although the model derived from the KTG is similar to the well‐known Kapitza thermal resistance formalism, it fails to predict the grain size dependence of the lattice thermal conductivity. The one derived from a LCM is a new formalism predicting, with good accuracy, the lattice thermal conductivity as a function of the average grain size. It is applicable for microstructures with a grain size typically above 20–50 nm.

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“…It was found that with increasing particle velocity and temperature the coating is densified and the thermal conductivity increases 14,15 . The quantitative effect of grain boundaries on the thermal conductivity was analyzed which shows that the thermal conductivity of small grains is lower compared to large grains [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y<sub>2</sub>O<sub>3</sub> Stabilized Zirconia (8 %YSZ)

Hu¹,

Khan²,

Wang³

et al. 2017

Preprint

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In this paper, the effect of microstructure on the thermal conductivity of plasma-sprayed Y2O3 stabilized ZrO2 (YSZ) thermal barrier coatings (TBCs) is investigated. Nine freestanding samples deposited on aluminum-base superalloy are studied. Cross-section morphology such as pores, cracks, m-phase content, grain boundary density of the coated samples are examined by scanning electron microscopy (SEM) and electron back-scattered diffraction (EBSD). Multiple linear regressions are used to develop quantitative models which describe the relationship between the particle parameters, m-phase content and the microstructure such as porosity, crack-porosity, the length density of small-angle-crack and the length density of big-angle-crack. Moreover, the relationship between microstructure and thermal conductivity is investigated. Results reveal that the thermal conductivity of the coating is mainly determined by the microstructure and grain boundary density at room temperature (25 ℃) and by the length density of big-angle-crack, monoclinic phase content and grain boundary density at high temperature (1200 ) ℃ .

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Grain-Size-Dependent Thermal Transport Properties in Nanocrystalline Yttria-Stabilized Zirconia

Cited by 7 publications

References 5 publications

Relative importance of grain boundaries and size effects in thermal conductivity of nanocrystalline materials

Relative importance of grain boundaries and size effects in thermal conductivity of nanocrystalline materials

Effect of Grain Boundaries on the Lattice Thermal Transport Properties of Insulating Materials: A Predictive Model

Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y<sub>2</sub>O<sub>3</sub> Stabilized Zirconia (8 %YSZ)

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