材料科学
稀土
腐蚀
涂层
热稳定性
磷灰石
化学气相沉积
热膨胀
热障涂层
化学工程
复合材料
纳米技术
冶金
工程类
作者
Zhenyue Luo,Jianing Jiang,Shunxi Dong,Chang Ling Zhou,Kaiyue Lü,Yunchuan Xie,Zhuo-Ping Duan,Yan Huang,Tingyang Chen,Longhui Deng,Xueqiang Cao
标识
DOI:10.1016/j.ceramint.2024.04.057
摘要
The novel potential environmental barrier coating materials, two high-entropy rare earth disilicates (HEDs) (Gd0.2Ho0.2Er0.2Yb0.2Lu0.2)2Si2O7 and (Sc0.2Ho0.2Er0.2Yb0.2Lu0.2)2Si2O7 were prepared by the solid-phase method. Both the HEDs showed remarkable high-temperature phase stability and an appropriate thermal expansion coefficient (CTE) that matched that of SiCf/SiC. In addition, both the HEDs possessed above 20% lower thermal conductivity at 1000 °C (1.37 and 1.42 W·m-1·K-1, respectively) compared to traditional single-component rare earth disilicate material YbDS, and they also exhibited higher mechanical properties and good resistance to water vapour corrosion at 1300 °C. Moreover, the corresponding free-standing coatings obtained after deposition by atmospheric plasma spraying (APS) showed excellent resistance to CMAS corrosion, primarily because of the formation of an apatite layer.
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