{"title":"Rare-earth compositional screening of high-entropy diborides for improved oxidation resistance","authors":"Haifeng Tang, Zihao Wen, Yiwen Liu, Lei Zhuang, Hulei Yu, Yanhui Chu","doi":"10.1111/jace.20123","DOIUrl":null,"url":null,"abstract":"<p>Compositional screening is an important strategy to improve the oxidation resistance of high-entropy diborides (HEB<sub>2</sub>), yet the related studies are limited. Here, we report a rare-earth (RE) element compositional screening strategy to improve the oxidation resistance of HEB<sub>2</sub>. To be specific, the single-phase (Hf<sub>0.28</sub>Zr<sub>0.28</sub>Ta<sub>0.28</sub>RE<sub>0.16</sub>)B<sub>2</sub> (HEB<sub>2</sub>-RE) samples with 12 different RE elements are fabricated via ultrafast ultrahigh-temperature synthesis and spark plasma sintering techniques, and their oxidation resistance is explored by isothermal oxidation tests. The results show that the as-obtained HEB<sub>2</sub>-Sc samples possess the best oxidation resistance among all the as-fabricated HEB<sub>2</sub>-RE samples. Such outstanding oxidation resistance is ascribed to the enhanced viscosity of the generated B<sub>2</sub>O<sub>3</sub> glass originating from the solid solution of (Zr, Me)<sub>0.84</sub>Sc<sub>0.16</sub>O<sub>2</sub> complex oxides, as confirmed by transmission electron microscope observations and first-principles calculations.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 1","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.20123","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
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Abstract
Compositional screening is an important strategy to improve the oxidation resistance of high-entropy diborides (HEB2), yet the related studies are limited. Here, we report a rare-earth (RE) element compositional screening strategy to improve the oxidation resistance of HEB2. To be specific, the single-phase (Hf0.28Zr0.28Ta0.28RE0.16)B2 (HEB2-RE) samples with 12 different RE elements are fabricated via ultrafast ultrahigh-temperature synthesis and spark plasma sintering techniques, and their oxidation resistance is explored by isothermal oxidation tests. The results show that the as-obtained HEB2-Sc samples possess the best oxidation resistance among all the as-fabricated HEB2-RE samples. Such outstanding oxidation resistance is ascribed to the enhanced viscosity of the generated B2O3 glass originating from the solid solution of (Zr, Me)0.84Sc0.16O2 complex oxides, as confirmed by transmission electron microscope observations and first-principles calculations.
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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:
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