A new high-entropy ceramic (Lu0.2Yb0.2Er0.2Tm0.2Sc0.2)2Si2O7 ((5RE0.2)2Si2O7) was proposed as a potential environmental barrier coating (EBC) material for ceramics matrix composites in this work. Experimental results showed that the (5RE0.2)2Si2O7 synthesized by solid-phase sintering was a monoclinic solid solution and had good phase stability proved by no obvious absorption/exothermic peak in the DSC curve from room temperature to 1400 °C. It performed a lower coefficient of thermal expansion (2.08 ×10−6-4.03 ×10−6 °C−1) and thermal conductivity (1.76–2.99 W•m−1•°C−1) compared with the five single principal RE2Si2O7. In water vapor corrosion tests, (5RE0.2)2Si2O7 also exhibited better water vapor corrosion resistance attributed to the multiple doping effects. The weight loss was only 3.1831 × 10−5 g•cm−2 after 200 h corrosion at 1500 °C, which was lower than that of each single principal RE2Si2O7. Therefore, (5RE0.2)2Si2O7 could be regarded as a remarkable candidate for EBCs. 

High-entropy rare-earth disilicate (Lu0.2Yb0.2Er0.2Tm0.2Sc0.2)2Si2O7：A potential environmental barrier coating material

Micro-sized nanoaggregates: Spray-drying-assisted fabrication and applications

Thermal cycling behavior and failure mechanism of the Si-HfO2 environmental barrier coating bond coats prepared by atmospheric plasma spraying

Thermal Cycling Behavior and Failure Mechanism of the Si-Hfo2 Environmental Barrier Coating Bond Coats Prepared by Atmospheric Plasma Spraying

LuPO4 ceramics have been synthesized by chemical precipitation and calcination approaches. The phase stability and the thermal properties of the ceramics as well as the thermochemical reactions between LuPO4 pellet and calcium–magnesium–alumina–silicate at 1300℃ have been investigated. The results indicated that LuPO4 has a relatively lower thermal conductivity (1.86 W m-1 K-1 at 1200 ℃) and a well-matched coefficient of thermal expansion (5.92 × 10-6 K-1) with SiC based ceramic matrix composites. No phase transformation occurs in single phase LuPO4 during the heating from room temperature to 1300 ℃. Corrosion tests showed that CMAS can dissolve LuPO4 and cause precipitation of crystalline phases such as Lu2Si2O7, CaAl2Si2O8, CaMgSi2O6, Ca2Lu8 (SiO4)6O2 and Ca8MgLu (PO4)7. Extending the corrosion duration results in the formation of Ca2Lu8 (SiO4)6O2 apatite and other crystalline phases with a dendritic-like structure in the CMAS layer. CMAS corrosion resistance of LuPO4 is significantly greater than Lu2Si2O7 since less LuPO4 need to be dissolved to form a protective apatite barrier layer. Ca8MgLu (PO4)7 tends to form a continuous reaction layer at the CMAS/LuPO4 interface. This dense and continuous layer can effectively inhibit molten CMAS penetration into LuPO4.

Thermal properties and Calcium-Magnesium-Alumina-Silicate (CMAS) resistance of LuPO4 as environmental barrier coatings

Superior compound coatings prepared by low-temperature vanadium-nitrocarburizing duplex treatment

Water vapor corrosion behavior and failure mechanism of plasma sprayed mullite/Lu2Si2O7-Lu2SiO5 coatings

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Superior compound coatings prepared by low-temperature vanadium-nitrocarburizing duplex treatment

Water vapor corrosion behavior and failure mechanism of plasma sprayed mullite/Lu2Si2O7-Lu2SiO5 coatings