Pyrochlore-fluorite dual-phase high-entropy ceramic foams with extremely low thermal conductivity from particle-stabilized suspension

Xuanyu Meng; Jie Xu; Jiatong Zhu; Ping Zhang; Artur Rydosz; Michael J. Reece; Feng Gao

doi:10.1016/j.scriptamat.2020.113714

Pyrochlore-fluorite dual-phase high-entropy ceramic foams with extremely low thermal conductivity from particle-stabilized suspension

Xuanyu Meng, Jie Xu, Jiatong Zhu, Ping Zhang, Artur Rydosz, Michael J. Reece, Feng Gao

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

59 Scopus citations

Abstract

Low thermal conductivity is highly desirable for porous ceramics for thermal insulation applications at high temperature. In this work, (La_0.2Nd_0.2Sm_0.2Gd_0.2Yb_0.2)₂Zr₂O₇ high-entropy powders with a pyrochlore-fluorite dual-phase structure were prepared by a solid-state reaction method. (La_0.2Nd_0.2Sm_0.2Gd_0.2Yb_0.2)₂Zr₂O₇ high-entropy ceramic foams were fabricated using a particle-stabilized foaming method. The as-prepared high-entropy ceramic foams exhibit high porosity (87.99%-96.89%) and low thermal conductivity (0.045-0.102 W/(m·K)). The (La_0.2Nd_0.2Sm_0.2Gd_0.2Yb_0.2)₂Zr₂O₇ high-entropy ceramic foam from a 20 wt% suspension sintered at 1500°C has a porosity of 96.89% and a thermal conductivity of 0.045 W/(m·K). The results indicate that pyrochlore-fluorite dual-phase high-entropy ceramic foams from particle-stabilized foams are candidate materials for high-temperature insulation applications.

Original language	English
Article number	113714
Journal	Scripta Materialia
Volume	194
DOIs	https://doi.org/10.1016/j.scriptamat.2020.113714
State	Published - 15 Mar 2021

Keywords

High-entropy ceramics
Particle-stabilized foams
Pyrochlore-fluorite structure
REZrO
Thermal conductivity

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10.1016/j.scriptamat.2020.113714

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@article{aee64e5624f644a4b288116135e65eeb,

title = "Pyrochlore-fluorite dual-phase high-entropy ceramic foams with extremely low thermal conductivity from particle-stabilized suspension",

abstract = "Low thermal conductivity is highly desirable for porous ceramics for thermal insulation applications at high temperature. In this work, (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy powders with a pyrochlore-fluorite dual-phase structure were prepared by a solid-state reaction method. (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy ceramic foams were fabricated using a particle-stabilized foaming method. The as-prepared high-entropy ceramic foams exhibit high porosity (87.99%-96.89%) and low thermal conductivity (0.045-0.102 W/(m·K)). The (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy ceramic foam from a 20 wt% suspension sintered at 1500°C has a porosity of 96.89% and a thermal conductivity of 0.045 W/(m·K). The results indicate that pyrochlore-fluorite dual-phase high-entropy ceramic foams from particle-stabilized foams are candidate materials for high-temperature insulation applications.",

keywords = "High-entropy ceramics, Particle-stabilized foams, Pyrochlore-fluorite structure, REZrO, Thermal conductivity",

author = "Xuanyu Meng and Jie Xu and Jiatong Zhu and Ping Zhang and Artur Rydosz and Reece, {Michael J.} and Feng Gao",

note = "Publisher Copyright: {\textcopyright} 2021",

year = "2021",

month = mar,

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doi = "10.1016/j.scriptamat.2020.113714",

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T1 - Pyrochlore-fluorite dual-phase high-entropy ceramic foams with extremely low thermal conductivity from particle-stabilized suspension

AU - Meng, Xuanyu

AU - Xu, Jie

AU - Zhu, Jiatong

AU - Zhang, Ping

AU - Rydosz, Artur

AU - Reece, Michael J.

AU - Gao, Feng

PY - 2021/3/15

Y1 - 2021/3/15

N2 - Low thermal conductivity is highly desirable for porous ceramics for thermal insulation applications at high temperature. In this work, (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy powders with a pyrochlore-fluorite dual-phase structure were prepared by a solid-state reaction method. (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy ceramic foams were fabricated using a particle-stabilized foaming method. The as-prepared high-entropy ceramic foams exhibit high porosity (87.99%-96.89%) and low thermal conductivity (0.045-0.102 W/(m·K)). The (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy ceramic foam from a 20 wt% suspension sintered at 1500°C has a porosity of 96.89% and a thermal conductivity of 0.045 W/(m·K). The results indicate that pyrochlore-fluorite dual-phase high-entropy ceramic foams from particle-stabilized foams are candidate materials for high-temperature insulation applications.

AB - Low thermal conductivity is highly desirable for porous ceramics for thermal insulation applications at high temperature. In this work, (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy powders with a pyrochlore-fluorite dual-phase structure were prepared by a solid-state reaction method. (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy ceramic foams were fabricated using a particle-stabilized foaming method. The as-prepared high-entropy ceramic foams exhibit high porosity (87.99%-96.89%) and low thermal conductivity (0.045-0.102 W/(m·K)). The (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 high-entropy ceramic foam from a 20 wt% suspension sintered at 1500°C has a porosity of 96.89% and a thermal conductivity of 0.045 W/(m·K). The results indicate that pyrochlore-fluorite dual-phase high-entropy ceramic foams from particle-stabilized foams are candidate materials for high-temperature insulation applications.

KW - High-entropy ceramics

KW - Particle-stabilized foams

KW - Pyrochlore-fluorite structure

KW - REZrO

KW - Thermal conductivity

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DO - 10.1016/j.scriptamat.2020.113714

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SN - 1359-6462

VL - 194

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 113714

ER -

Pyrochlore-fluorite dual-phase high-entropy ceramic foams with extremely low thermal conductivity from particle-stabilized suspension

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