Calcium-Magnesium-Aluminosilicate (CMAS) corrosion resistance of high entropy rare-earth phosphate (Lu0.2Yb0.2Er0.2Y0.2Gd0.2)PO4: A novel environmental barrier coating candidate
Calcium-Magnesium-Aluminosilicate (CMAS) corrosion resistance of high entropy rare-earth phosphate (Lu0.2Yb0.2Er0.2Y0.2Gd0.2)PO4: A novel environmental barrier coating candidate
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DOI：
10.1016/j.jeurceramsoc.2023.06.030
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发表时间：
2023-06
影响因子：
5.7
通讯作者：
Keith Bryce;Yueh-Ting Shih;Liping Huang;Jie Lian
中科院分区：
文献类型：
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作者：
Keith Bryce;Yueh-Ting Shih;Liping Huang;Jie Lian
合成了单相（Lu0.2Yb0.2Er0.2Y0.2Gd0.2） po4，并对其热性能和耐CMAS性能进行了研究，以探索其作为环境屏障涂层（EBC）候选材料的潜力。高熵磷酸盐（Lu0.2Yb0.2Er0.2Y0.2Gd0.2） po4表现出较低的热导率（2.86 W m−1K−1at 1250 K），比所有单组分xenotime相稀土磷酸盐。（Lu0.2Yb0.2Er0.2Y0.2Gd0.2）PO4球团与CMAS在1300℃下相互作用，形成致密均匀的Ca8MgRE(PO4)7反应层，阻止了CMAS向球团的渗透。在1400℃和1500℃时，（Lu0.2Yb0.2Er0.2Y0.2Gd0.2）PO4-CMAS腐蚀表现为CMAS通过晶界渗透到反应层外的颗粒中，sio2析出物残留在颗粒表面。在优化材料设计和高熵稀土磷酸盐作为先进EBC应用候选者的性能的背景下，讨论了持续时间、温度和成分对抗CMAS腐蚀的影响。
Single phase (Lu0.2Yb0.2Er0.2Y0.2Gd0.2)PO4was synthesized, and its thermal properties and CMAS resistance were investigated to explore its potential as an environmental barrier coating (EBC) candidate. The high entropy phosphate (Lu0.2Yb0.2Er0.2Y0.2Gd0.2)PO4displays a lower thermal conductivity (2.86 W m−1K−1at 1250 K) than all the single component xenotime phase rare-earth phosphates. Interaction of (Lu0.2Yb0.2Er0.2Y0.2Gd0.2)PO4pellets with CMAS at 1300 °C led to the formation of a dense and uniformed Ca8MgRE(PO4)7reaction layer, which halted the CMAS penetration into the bulk pellet. At 1400 and 1500 °C the (Lu0.2Yb0.2Er0.2Y0.2Gd0.2)PO4-CMAS corrosion showed CMAS penetrating beyond the reaction layer into the bulk pellet via the grain boundaries, and SiO2precipitates remaining at the pellet surface. The effects of duration, temperature, and compositions on the resistance against CMAS corrosion are discussed within the context of optimizing materials design and performance of high entropy rare-earth phosphates as candidates for advanced EBC applications.