掺稀土的 ZrB2-MoSi2 陶瓷：致密化和氧化行为

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-10-15 DOI:10.1016/j.jeurceramsoc.2024.116992

Laura Silvestroni , Hai-Tao Liu , Diletta Sciti , Xin-Gang Wang , Guo-Jun Zhang

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引用次数: 0

摘要

研究了稀土氧化物（REO）（Nd2O3 和 Eu2O3）对无压烧结 ZrB2-MoSi2 陶瓷复合材料的致密化和氧化行为的影响。加入 REO 后形成的 REO 硅酸盐在烧结温度下呈液态，有助于物质转移机制。在 1500 °C 下进行 0.5-4 小时的氧化研究表明，Eu2O3 可以提高 ZrB2-MoSi2 系统的抗氧化性，尤其是在长时间暴露后，而 Nd2O3 则会导致陶瓷加速降解。研究发现，分散在二氧化硅和氧化锆中的 Eu 改变了玻璃相的流变特性，从而在阻止氧气从大气进入次表层方面发挥了重要作用，从而显著提高了抗氧化性。

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Rare earth-doped ZrB2-MoSi2 ceramics: Densification and oxidation behavior

The effect of rare earth oxides (REO), Nd₂O₃ and Eu₂O₃, on the densification and oxidation behavior of pressureless sintered ZrB₂-MoSi₂ ceramic composites was investigated. Addition of REO results in the formation of REO-silicates which are liquid at the sintering temperature and contribute to matter transfer mechanisms. Oxidation studies at 1500 °C for 0.5–4 h evidenced that Eu₂O₃ can improve oxidation resistance in the ZrB₂-MoSi₂ system, especially after prolonged exposition, whilst Nd₂O₃ induces faster degradation of the ceramic. It was found that the Eu dispersed both in silica and in zirconia modifies the rheological properties of the glassy phase thus playing an important role in hindering oxygen inward from the atmosphere to the subsurface, resulting in a noticeable improvement of the oxidation resistance.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.