A high-entropy (Er0.25Y0.25Ho0.25Yb0.25)2Si2O7 ceramic with good thermal properties and water-vapor corrosion resistance

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-10-15 DOI:10.1111/ijac.14953

Bingqing Zhao, Wei Xie, Hailong Wang, Jinpeng Zhu, Mingliang Li, Bei Cai

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Abstract

A high-entropy rare-earth disilicate (Er_0.25Y_0.25Ho_0.25Yb_0.25)₂Si₂O₇ (hereinafter referred to as (EYHY)₂Si₂O₇) ceramic was synthesized by a heat treatment process combined with spark plasma sintering. According to the experimental results, (EYHY)₂Si₂O₇ presents good phase stability and low thermal conductivity ([1.48–2.35] W∙m⁻¹∙K⁻¹) from room temperature to 1200°C. Its coefficient of thermal expansion is (3.89–5.32) × 10⁻⁶ K⁻¹ from 200 to 1400°C, similar to SiC-based materials ([4.5–5.5] × 10⁻⁶ K⁻¹). Due to the multiple doping effects, (EYHY)₂Si₂O₇ exhibits outstanding corrosion resistance performance in water-vapor corrosion tests. Its weight loss is 1.79 mg/cm² after corrosion at 1600°C for 30 h in the presence of 50% H₂O-50% O₂, which is lower than the corresponding four single components Re₂Si₂O₇ (Er₂Si₂O₇, Y₂Si₂O₇, Ho₂Si₂O₇, and Yb₂Si₂O₇) under the same conditions. Therefore, high-entropy (EYHY)₂Si₂O₇ ceramics are regarded as potential environmental barrier coatings materials for SiC ceramic matrix composites.

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一种高熵（Er0.25Y0.25Ho0.25Yb0.25）2Si2O7陶瓷，具有良好的热性能和抗水蒸气腐蚀性能

采用热处理与放电等离子烧结相结合的方法合成了高熵稀土二硅酸盐（Er0.25Y0.25Ho0.25Yb0.25）2Si2O7（以下简称（EYHY）2Si2O7）陶瓷。实验结果表明，（EYHY）2Si2O7在室温至1200℃范围内具有良好的相稳定性和较低的热导率（[1.48-2.35]W∙m−1∙K−1）。在200 ~ 1400℃范围内，其热膨胀系数为（3.89 ~ 5.32）× 10−6 K−1，与sic基材料（[4.5 ~ 5.5]× 10−6 K−1）相似。由于多重掺杂作用，（EYHY）2Si2O7在水蒸气腐蚀试验中表现出优异的耐腐蚀性能。在50% H2O-50% O2存在下，1600℃腐蚀30 h后，其失重量为1.79 mg/cm2，低于相同条件下对应的四种Re2Si2O7单组分（Er2Si2O7、Y2Si2O7、Ho2Si2O7和Yb2Si2O7）。因此，高熵（EYHY）2Si2O7陶瓷被认为是潜在的SiC陶瓷基复合材料环境屏障涂层材料。

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阿拉丁

Re2O3

来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;