Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 35, Issue 12, Pages 2892-2896Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.08.012
Keywords
(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4; High-entropy ceramics; Al(2)O(3)f/Al2O3 ceramic matrix composites; Environmental barrier coating materials; Interphase material; Thermal expansion coefficient; Thermal conductivity; Solution synthesis; Rare-earth phosphates; Monazite
Funding
- National Natural Science Foundation of China [51672064, U1435206]
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Low thermal conductivity, matched thermal expansion coefficient and good compatibility are general requirements for the environmental/thermal barrier coatings (EBCs/TBCs) and interphases for Al2O3f/Al2O3 composites. In this work, a novel high-entropy (HE) rare-earth phosphate monazite ceramic (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is designed and successfully synthesized. This new type of HE rare-earth phosphate monazite exhibits good chemical compatibility with Al2O3, without reaction with Al2O3 as high as 1600 degrees C in air. Moreover, the thermal expansion coefficient (TEC) of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 (8.9 x 10(-6)/degrees C at 300-1000 degrees C) is close to that of Al2O3. The thermal conductivity of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 at room temperature is as low as 2.08 W.m(-1).K-1, which is about 42% lower than that of LaPO4. Good chemical compatibility, close TEC to that of Al2O3, and low thermal conductivity indicate that HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is suitable as a candidate EBC/TBC material and an interphase for Al2O3f/Al2O3 composites. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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