A new high entropy rare earth disilicate ceramic (Lu1/8Yb1/8Sc1/8Er1/8Y1/8Ho1/8Dy1/8Tb1/8)2Si2O7: High temperature corrosion of water vapor and molten calcium–magnesium–aluminosilicate (CMAS)

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-02-01 DOI:10.1016/j.jallcom.2024.173687

Xu Wang , Feihan Xu , Mingyu Meng , Ling Liu , Xinchun Tian , Lihong Gao , Shizhen Zhu , Zhuang Ma

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Abstract

A new β-(Lu_1/8Yb_1/8Sc_1/8Er_1/8Y_1/8Ho_1/8Dy_1/8Tb_1/8)₂Si₂O₇ ((8RE_1/8)₂Si₂O₇) disilicate was prepared using a solid reaction process to protect SiC_f/SiC CMC component materials. The thermal properties and corrosion resistance of (8RE_1/8)₂Si₂O₇ were systematically studied. Experimental results showed that (8RE_1/8)₂Si₂O₇ exhibited lower thermal conductivity than that of one-component silicate materials, only 1.80 (W•m⁻¹•K⁻¹) at 1000 °C. Meanwhile, (8RE_1/8)₂Si₂O₇ also exhibited superior water vapor and CMAS corrosion resistance. The weight loss was 1.05 × 10⁻⁴ g/cm² after 200 h corrosion at 1400 °C. When it interacted with CMAS at 1300 ℃ for 48 h, the reaction layer was only 16 µm. Therefore, (8RE_1/8)₂Si₂O₇ could be regarded as a remarkable candidate for T/EBC.

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一种新型高熵稀土二硅酸盐陶瓷（Lu1/8Yb1/8Sc1/8Er1/8Y1/8Ho1/8Dy1/8Tb1/8）2Si2O7：水蒸气和熔融钙镁铝硅酸盐（CMAS）的高温腐蚀性能

采用固体反应工艺制备了一种新的β-(Lu1/8Yb1/8Sc1/8Er1/8Y1/8Ho1/8Dy1/8Tb1/8)2Si2O7（(8RE1/8)2Si2O7）二硅酸盐，用于保护 SiCf/SiC CMC 成分材料。对 (8RE1/8)2Si2O7 的热性能和耐腐蚀性能进行了系统研究。实验结果表明，(8RE1/8)2Si2O7 的热导率低于单组分硅酸盐材料，在 1000 °C 时仅为 1.80 (W-m-1-K-1)。同时，(8RE1/8)2Si2O7 还具有优异的抗水蒸气和 CMAS 腐蚀性。在 1400 °C 下腐蚀 200 小时后，重量损失为 1.05 × 10-4 g/cm2。在 1300 ℃ 下与 CMAS 作用 48 小时后，反应层仅为 16 μm。因此，(8RE1/8)2Si2O7 可被视为 T/EBC 的理想候选材料。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.