Grain-size dependent thermal conductivity of Gd2Zr2O7 ceramics

Wang, Haomin; Du, Xiaofeng; Shi, Yang; Deng, Mao; Wang, Jun; Qi, Jianqi; Huang, Zhangyi

doi:10.1016/j.ceramint.2022.02.283

Cited by 11 publications

(1 citation statement)

References 28 publications

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“…How to effectively quantify the multiscale features of ceramic materials is certainly remaining as an outstanding problem. As an example, the grain size in ceramic materials usually exhibits a statistical distribution, 3,4 which exactly reflects an aspect of the multiscale nature of the structure, and commonly the linear intercept technique [5][6][7] is used to measure it. Although this method has been improved in two-phase polycrystalline ceramics by correcting the length of the test lines used and the number of intercepts, 8 it neglects the morphology and orientation of the grains.…”

Section: Introductionmentioning

confidence: 99%

A uniform rule between hardness and structure hierarchy of ceramics in both direct and inverse Hall–Petch regimes

et al. 2023

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The MicroStructure Hierarchy Descriptor (μ$\umu$SHD) has built a bridge in linking the structure hierarchy and properties of ceramic materials. Here, a new variable Asc$Asc$, which stands for the average of scales present in a ceramic microstructure, based on the μ$\umu$SHD, is constructed and calibrated. It is found that the Asc$Asc$ is not only related to the size scales, but also the morphological features in microstructures, due to an inheritance from the μ$\umu$SHD. The Asc$Asc$ is positively linear correlated with the average grain size d, but the relationship changes to be nonlinear when the morphology of grains is considered. In the Hall–Petch regime, the Vickers hardness HV of both, ZrO2–SiC composite ceramics and a class of high entropy metallic borides, is found to increase with the decrease of Asc$Asc$ index. For the case study of ZrO2 ceramic, a uniform rule is found to be valid in both the direct and inverse Hall–Petch regimes that the Asc$Asc$ varies in an opposite trend as the HV varies with d.

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Section: Introductionmentioning

confidence: 99%

A uniform rule between hardness and structure hierarchy of ceramics in both direct and inverse Hall–Petch regimes

et al. 2023

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A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y₃NbO₇ Ceramic

Chen

Zou

et al. 2023

Adv Funct Materials

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Dissipation of heat efficiently from a hot object via radiation while minimizing the inward heat conduction is the key requirement of radiation thermal protection. In this study, a Ca‐Cr co‐doped Y3NbO7 coating with lamellar porous structure is fabricated, which shows an ultra‐low thermal conductivity (<0.7 W m−1 K−1) and near‐unity emissivity (>0.9) across a broad wavelength range of ≈1–24 µm. This record high emissivity to thermal conductivity ratio (≈1.3) is experimentally and theoretically revealed from a multi‐scale perspective. The diffusoin‐mediated thermal conduction feature of niobates combined with lamellar porous structure of the coating reduces its thermal conductivity to an impressive 0.5 W m−1 K−1 at 25 °C, surpassing the theoretical amorphous limitation of 0.72 W m−1 K−1. Experiments and FDTD calculation results demonstrate that the intrinsic emissivity dips at shallow extinction wavelengths (1 and 8 µm) and strong phonon‐polariton resonances wavelengths (>13 µm) can be effectively compensated by the multiple scattering/absorption and gradual modulation of conical shape/effective refractive index induced by surface micro‐protrusion structures, respectively. Furthermore, the coating exhibits robust mechanical and thermal stability with a high bonding strength (18.3 MPa) and thermal expansion coefficient (≈11 × 10−6 K−1 at 1200 °C) comparable to YSZ, showing great potential in the radiation thermal protection field.

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Structure and properties of RE2HE2O7 thermal barrier ceramics designed with high-entropy at different sites

Wei,

Ma,

Hong

et al. 2024

Bull Mater Sci

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Grain-size dependent thermal conductivity of Gd2Zr2O7 ceramics

Cited by 11 publications

References 28 publications

A uniform rule between hardness and structure hierarchy of ceramics in both direct and inverse Hall–Petch regimes

A uniform rule between hardness and structure hierarchy of ceramics in both direct and inverse Hall–Petch regimes

A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y₃NbO₇ Ceramic

Structure and properties of RE2HE2O7 thermal barrier ceramics designed with high-entropy at different sites

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Grain-size dependent thermal conductivity of Gd2Zr2O7 ceramics

Cited by 11 publications

References 28 publications

A uniform rule between hardness and structure hierarchy of ceramics in both direct and inverse Hall–Petch regimes

A uniform rule between hardness and structure hierarchy of ceramics in both direct and inverse Hall–Petch regimes

A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y3NbO7 Ceramic

Structure and properties of RE2HE2O7 thermal barrier ceramics designed with high-entropy at different sites

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A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y₃NbO₇ Ceramic