Significantly reduced thermal conductivity through dual-site high-entropy strategy in rare-earth hexaaluminates

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-05-01 DOI:10.1016/j.ceramint.2025.01.520

Lin Zhou, Ji-Xuan Liu, Pai Peng, Qinghong Zhang, Guo-Jun Zhang

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引用次数: 0

Abstract

LaMgAl₁₁O₁₉ (LMA) is an important thermal barrier coating (TBC) material due to its remarkable fracture toughness, excellent sintering resistance and better thermal stability, but the relatively high thermal conductivity limits its application. In this work, single-site high-entropy rare-earth hexaaluminates (La_0.2Nd_0.2Sm_0.2Eu_0.2Gd_0.2)MgAl₁₁O₁₉ (HE-L), La(Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2)Al₁₁O₁₉ (HE-M) and dual-site high-entropy rare-earth hexaaluminates (La_0.2Nd_0.2Sm_0.2Eu_0.2Gd_0.2)(Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2)Al₁₁O₁₉ (HE-LM) ceramics were successfully fabricated by solid-state reaction sintering, and their phase evolution process, mechanical and thermal properties were analyzed. The phase evolution process for the high-entropy rare-earth hexaaluminate is similar to that of the single-component LMA. The dual-site HE-LM ceramic exhibits a significant increase in Vickers hardness (13.63 GPa), fracture toughness (4.18 MPa‧m^1/2) and a decrease in thermal conductivity (2.02–2.55 W·m⁻¹·K⁻¹, 25–1100 °C) as compared to the LMA ceramics. This work demonstrates the excellent mechanical and thermophysical properties of the HE-LM ceramics. It is expected that the high-entropy rare-earth hexaaluminates will be a promising candidate for TBC.

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通过双位高熵策略显著降低了稀土六铝酸盐的导热性

LaMgAl11O19 （LMA）具有优异的断裂韧性、优异的烧结性能和较好的热稳定性，是一种重要的热障涂层（TBC）材料，但相对较高的导热系数限制了其应用。本文采用固相反应烧结法制备了单位高熵稀土六铝酸盐（La0.2Nd0.2Sm0.2Eu0.2Gd0.2）MgAl11O19 （HE-L）、La(Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)Al11O19 （HE-M）和双位高熵稀土六铝酸盐（La0.2Nd0.2Sm0.2Eu0.2Gd0.2）（Mg0.2Co0.2Ni0.2Cu0.2Zn0.2）Al11O19 （HE-LM）陶瓷，并对其相演化过程、力学性能和热性能进行了分析。高熵稀土六铝酸盐的相演化过程与单组分LMA相演化过程相似。与LMA陶瓷相比，双点HE-LM陶瓷的维氏硬度（13.63 GPa）和断裂韧性（4.18 MPa·m1/2）显著提高，导热系数（2.02 ~ 2.55 W·m−1·K−1,25 ~ 1100℃）显著降低。这项工作证明了HE-LM陶瓷优异的机械和热物理性能。高熵稀土六铝酸盐有望成为TBC的理想材料。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.