Investigation on improving the comprehensive performance of environmental barrier coating materials by high-entropy multiphase design

Abstract It is difficult to obtain a single-phase environmental barrier coating material that simultaneously offers the advantages of low thermal conductivity, a suitable coefficient of thermal expansion, and excellent corrosion resistance. Herein, to synthesize the advantages of single-phase materials, we have developed an effective approach for the design of high-entropy multiphase ceramics of rare earth oxides and silicates. Such a specific design approach is capable of making high-entropy RE 2 SiO 5 /RE 2 O 3 and RE 2 SiO 5 /RE 2 Si 2 O 7 (RE = Lu, Yb, Tm, Er, Ho, and Y) multiphase ceramics as two types of potential environmental barrier coating materials for Al 2 O 3f /Al 2 O 3 and SiC f /SiC ceramic matrix composites.