Abstract
A novel high-entropy material,(Y0.2Gd0.2Er0.2Yb0.2Lu0.2)2Zr2O7 was successfully synthesized by the solid state reaction method and spark plasma sintering,and investigated as a promising thermal barrier coating material.Rare-earth elements were distributed homogeneously in the pyrochlore structure.It was found that the prepared high-entropy ceramic maintains pyrochlore structure at the temperature up to 1600℃,and it possesses a similar thermal expansion coefficient(10.2×10-6 K-1 at 25-900℃)to that of YSZ,low thermal conductivity(＜0.9 W m-1 K-1 at 100-1000℃)and good CMAS resistance(infiltration depth is 22 μm after annealed at 1300℃for 24 h).The corrosion process was investigated,and RE elements distributing homogeneously in(Y0.2Gd0.2Er0.2Yb0.2 Lu0.2)2Zr2O7 show different diffusion rates in CMAS.RE3+with a larger radius(closer to Ca2+)is easier to react with CMAS to form an apatite phase.
基金项目
National Key Research and De-velopment Program of China(2016YFB070204)
Na-tional Natural Science Foundation of China(52072381)
Na-tional Natural Science Foundation of China(U1904217)
NETL
NSTL
万方数据