High-entropy environmental barrier coating for the ceramic matrix composites
High-entropy environmental barrier coating for the ceramic matrix composites
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陶瓷基复合材料的高熵环境阻隔涂层
DOI：
10.1016/j.jeurceramsoc.2019.02.022
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发表时间：
2019-07-01
影响因子：
5.7
通讯作者：
Wang, Yiguang
中科院分区：
文献类型：
--
作者：
Dong, Yu;Ren, Ka;Wang, Yiguang
采用溶胶-凝胶法制备了一种新型高熵材料（Yb 0.2Y 0.2Lu 0.2Sc 0.2Gd 0.2）（2）Si 2 O 7（（5 RE（0.2））（2）Si 2 O 7），并将其作为SiC基复合材料的环境阻隔涂层（EBC）进行了研究。X射线衍射和透射电子显微镜的结果表明，稀土元素均匀分布在单一的单斜相。研究发现，（SRE 0.2）（2）Si_2O_7具有良好的相稳定性，与SiC基复合材料的热膨胀系数匹配良好，并且具有优异的抗水蒸气腐蚀性能。（SRE 0.2）（2）Si_2O_7涂层C-f/SiC复合材料的水蒸气腐蚀试验进一步证实了（SRE 0.2）（2）Si_2O_7适合用作EBC材料，并能有效地保护C-f/SiC复合材料免受水蒸气损伤。
A novel high-entropy material, (Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)(2)Si2O7 ((5RE(0.2))(2)Si2O7) was prepared by the sol-gel method and investigated as a promising environmental barrier coating (EBC) for SiC-based composites. The results of X-ray diffraction and transmission electron microscopy indicated that rare-earth elements were distributed homogeneously in the single monoclinic phase. Moreover, it was found that the new material (SRE0.2)(2)Si2O7 had good phase stability, well-matched coefficient of thermal expansion with SiC-based composite, and excellent resistance to water-vapor corrosion. The water-vapor corrosion test of (SRE0.2)(2)Si2O7 coated C-f/SiC composites further confirmed that (SRE0.2)(2)Si2O7 was suitable for application as EBC material and could provide effective protection to C-f/SiC composites from water-vapor damage.