Porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7: A novel high‐entropy ceramic with high porosity and excellent thermal stability

With the rapid development of hypersonic vehicles, the thermal protection systems face great challenges due to the severe aerodynamic heat. As a result, conventional fiber insulation tiles would experience severe shrinkage at high temperatures (>1500°C), endangering the safety of the aircraft. To...

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Published in:Journal of the American Ceramic Society 2024-10, Vol.107 (10), p.6921-6929
Main Authors: Zhou, Jiaxin, Zeng, Dawei, Wu, Zhen, Sun, Luchao, Wang, Jingyang
Format: Article
Language:English
Subjects:
Activated sintering
Aerodynamic stability
Dimensional stability
Entropy
good high‐temperature stability
High temperature
high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 ceramic
Hypersonic vehicles
low thermal conductivity
Porosity
Porous materials
superhigh porosity
Thermal conductivity
Thermal insulation
Thermal protection
Thermal resistance
Thermal stability
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creator Zhou, Jiaxin
Zeng, Dawei
Wu, Zhen
Sun, Luchao
Wang, Jingyang
description With the rapid development of hypersonic vehicles, the thermal protection systems face great challenges due to the severe aerodynamic heat. As a result, conventional fiber insulation tiles would experience severe shrinkage at high temperatures (>1500°C), endangering the safety of the aircraft. To solve the problem, a high‐entropy effect was introduced to increase the high‐temperature resistance of thermal insulation materials, and highly porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 was prepared by in situ reaction sintering process in this work. The fabricated porous samples present excellent overall properties, including superhigh porosity (95.09%–93.10%), lightweight (0.29–0.41 g/cm3), and very low thermal conductivity (0.066–0.085 W/(m·K)). More importantly, porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 has outstanding high‐temperature dimensional stability. Although the porosity of the sample is higher than 90%, its linear shrinkage at 1550°C for 2 h is less than 1%. The results demonstrate that porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 is a promising thermal insulation material in extreme high‐temperature environments. This work develops a new style of high‐temperature resistance thermal insulation material, and the prepared porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 ceramic has the merits of superhigh porosity, lightweight, high strength, and very low thermal conductivity. Especially, the new material has excellent high‐temperature dimensional stability (shrinkage 
doi_str_mv 10.1111/jace.19955
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As a result, conventional fiber insulation tiles would experience severe shrinkage at high temperatures (&gt;1500°C), endangering the safety of the aircraft. To solve the problem, a high‐entropy effect was introduced to increase the high‐temperature resistance of thermal insulation materials, and highly porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 was prepared by in situ reaction sintering process in this work. The fabricated porous samples present excellent overall properties, including superhigh porosity (95.09%–93.10%), lightweight (0.29–0.41 g/cm3), and very low thermal conductivity (0.066–0.085 W/(m·K)). More importantly, porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 has outstanding high‐temperature dimensional stability. Although the porosity of the sample is higher than 90%, its linear shrinkage at 1550°C for 2 h is less than 1%. The results demonstrate that porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 is a promising thermal insulation material in extreme high‐temperature environments. This work develops a new style of high‐temperature resistance thermal insulation material, and the prepared porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 ceramic has the merits of superhigh porosity, lightweight, high strength, and very low thermal conductivity. Especially, the new material has excellent high‐temperature dimensional stability (shrinkage &lt; 1%, at 1550°C) and solves the problem that conventional fiber insulation tiles would generate severe shrinkage (6.6%–15.3%) at high temperatures.</description><identifier>ISSN: 0002-7820</identifier><identifier>EISSN: 1551-2916</identifier><identifier>DOI: 10.1111/jace.19955</identifier><language>eng</language><publisher>Columbus: Wiley Subscription Services, Inc</publisher><subject>Activated sintering ; Aerodynamic stability ; Dimensional stability ; Entropy ; good high‐temperature stability ; High temperature ; high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 ceramic ; Hypersonic vehicles ; low thermal conductivity ; Porosity ; Porous materials ; superhigh porosity ; Thermal conductivity ; Thermal insulation ; Thermal protection ; Thermal resistance ; Thermal stability</subject><ispartof>Journal of the American Ceramic Society, 2024-10, Vol.107 (10), p.6921-6929</ispartof><rights>2024 The American Ceramic Society.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000-0003-2570-578X ; 0000-0002-4748-8512 ; 0000-0001-5195-4697</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Zhou, Jiaxin</creatorcontrib><creatorcontrib>Zeng, Dawei</creatorcontrib><creatorcontrib>Wu, Zhen</creatorcontrib><creatorcontrib>Sun, Luchao</creatorcontrib><creatorcontrib>Wang, Jingyang</creatorcontrib><title>Porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7: A novel high‐entropy ceramic with high porosity and excellent thermal stability</title><title>Journal of the American Ceramic Society</title><description>With the rapid development of hypersonic vehicles, the thermal protection systems face great challenges due to the severe aerodynamic heat. As a result, conventional fiber insulation tiles would experience severe shrinkage at high temperatures (&gt;1500°C), endangering the safety of the aircraft. To solve the problem, a high‐entropy effect was introduced to increase the high‐temperature resistance of thermal insulation materials, and highly porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 was prepared by in situ reaction sintering process in this work. The fabricated porous samples present excellent overall properties, including superhigh porosity (95.09%–93.10%), lightweight (0.29–0.41 g/cm3), and very low thermal conductivity (0.066–0.085 W/(m·K)). More importantly, porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 has outstanding high‐temperature dimensional stability. Although the porosity of the sample is higher than 90%, its linear shrinkage at 1550°C for 2 h is less than 1%. The results demonstrate that porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 is a promising thermal insulation material in extreme high‐temperature environments. This work develops a new style of high‐temperature resistance thermal insulation material, and the prepared porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 ceramic has the merits of superhigh porosity, lightweight, high strength, and very low thermal conductivity. 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As a result, conventional fiber insulation tiles would experience severe shrinkage at high temperatures (&gt;1500°C), endangering the safety of the aircraft. To solve the problem, a high‐entropy effect was introduced to increase the high‐temperature resistance of thermal insulation materials, and highly porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 was prepared by in situ reaction sintering process in this work. The fabricated porous samples present excellent overall properties, including superhigh porosity (95.09%–93.10%), lightweight (0.29–0.41 g/cm3), and very low thermal conductivity (0.066–0.085 W/(m·K)). More importantly, porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 has outstanding high‐temperature dimensional stability. Although the porosity of the sample is higher than 90%, its linear shrinkage at 1550°C for 2 h is less than 1%. The results demonstrate that porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 is a promising thermal insulation material in extreme high‐temperature environments. This work develops a new style of high‐temperature resistance thermal insulation material, and the prepared porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 ceramic has the merits of superhigh porosity, lightweight, high strength, and very low thermal conductivity. Especially, the new material has excellent high‐temperature dimensional stability (shrinkage &lt; 1%, at 1550°C) and solves the problem that conventional fiber insulation tiles would generate severe shrinkage (6.6%–15.3%) at high temperatures.</abstract><cop>Columbus</cop><pub>Wiley Subscription Services, Inc</pub><doi>10.1111/jace.19955</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0003-2570-578X</orcidid><orcidid>https://orcid.org/0000-0002-4748-8512</orcidid><orcidid>https://orcid.org/0000-0001-5195-4697</orcidid></addata></record>
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subjects Activated sintering
Aerodynamic stability
Dimensional stability
Entropy
good high‐temperature stability
High temperature
high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 ceramic
Hypersonic vehicles
low thermal conductivity
Porosity
Porous materials
superhigh porosity
Thermal conductivity
Thermal insulation
Thermal protection
Thermal resistance
Thermal stability
title Porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7: A novel high‐entropy ceramic with high porosity and excellent thermal stability
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