Low thermal conductivity and enhanced thermal cycling performance of (Sm0.2Gd0.2Dy0.2Er0.2Yb0.2)2Zr2O7 coating

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-05-27 DOI:10.1111/jace.20629

Yali Yu, Yang Lu, Guanghua Liu, Jian Sun, Wei Liu, Yuxian Cheng, Xiangyang Liu, Wei Pan, Chunlei Wan

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引用次数: 0

Abstract

In this work, the thermal performance of the high-entropy (Sm_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Zr₂O₇ (HEFO) coating was evaluated. The as-sprayed HEFO coating exhibited a significantly lower initial thermal conductivity of <0.80 W·m⁻¹·K⁻¹, almost half of that of the conventional yttria-stabilized zirconia (YSZ) coating (∼1.2 W·m⁻¹·K⁻¹). When subjected to prolonged sintering at 1300°C for 40 h, the thermal conductivity of the HEFO coating gradually increased to ∼1.1 W·m⁻¹·K⁻¹ at 1200°C. Moreover, the HEFO coating demonstrated a thermal expansion coefficient of approximately 11 × 10⁻⁶ K⁻¹, which aligns with that of YSZ coatings. The HEFO coating showed improved durability during thermal cycling tests at 1100°C in air, and its lifetime was 919 cycles. The improvement can be attributed to the excellent phase stability and chemical compatibility.

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（Sm0.2Gd0.2Dy0.2Er0.2Yb0.2）2Zr2O7涂层导热系数低，热循环性能增强

本文对高熵（Sm0.2Gd0.2Dy0.2Er0.2Yb0.2）2Zr2O7 （HEFO）涂层的热性能进行了评价。喷涂后的HEFO涂层的初始热导率为0.80 W·m−1·K−1，几乎是传统氧化钇稳定氧化锆（YSZ）涂层（约1.2 W·m−1·K−1）的一半。在1300℃下长时间烧结40 h后，HEFO涂层的导热系数在1200℃时逐渐提高到~ 1.1 W·m−1·K−1。此外，HEFO涂层的热膨胀系数约为11 × 10−6 K−1，与YSZ涂层的热膨胀系数一致。在1100℃的空气热循环试验中，HEFO涂层的耐久性得到了提高，其寿命达到了919次。这种改进可归因于优异的相稳定性和化学相容性。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.