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EM in ScienceDirect
Figure/Table detail
Corrosion performance of high-entropy (Ho
0.2
Er
0.2
Tm
0.2
Yb
0.2
Lu
0.2
)
2
Si
2
O
7
environmental barrier coating material under CMAS conditions at 1500 ℃
Zhang Zhenya, Yuan Shuai, Zhu Zihao, Gao Wei, Meng Yifan, Xue Zhaolu, Xiang Tengfei, Shen Yizhou, Yan Kai, Gyawali Gobinda, Zhang Shihong
Extreme Materials
, DOI:
10.1016/j.exm.2026.01.001
Materials
Thermal conductivity
(W∙m
-1
∙K
-1
)
Temperature range
(℃)
(5RE
0.2
)
2
Si
2
O
7
1.46-3.49
20-1500
Lu
2
Si
2
O
7
1.8-4.3
20-1000
[
12
]
Yb
2
Si
2
O
7
1.8-4.4
20-1000
[
12
]
Tm
2
Si
2
O
7
——
——
Er
2
Si
2
O
7
4.6±0.4
20
[
20
]
Ho
2
Si
2
O
7
1.5-5.9
20-1200
[
14
]
Table 2.
Thermal conductivity of (5RE
0.2
)
2
Si
2
O
7
and each single principal RE
2
Si
2
O
7
Other figure/table from this article
Fig.1
Schematic diagram of preparation of (5RE
0.2
)
2
Si
2
O
7
powder and bulk.
Fig.2
XRD patterns (a), Rietveld refinement of XRD pattern (b), Raman spectrum (c), and crystal structure (d) of high-entropy (5RE
0.2
)
2
Si
2
O
7
Table 1
Crystal structure parameters of high-entropy (5RE
0.2
)
2
Si
2
O
7
and individual RE
2
Si
2
O
7
Fig. 3
Microstructure, EDS maps, and elemental composition of high-entropy (5RE
0.2
)
2
Si
2
O
7
ceramic
Fig. 4
Heat capacity (a), thermal diffusivity coefficient (b), and thermal conductivity (c) of high-entropy (5RE
0.2
)
2
Si
2
O
7
ceramic
Fig. 5
TG/DSC curves of high-entropy (5RE
0.2
)
2
Si
2
O
7
from room temperature to 1500 °C
Fig. 6
Schematic diagram of microhardness of high-entropy (5RE
0.2
)
2
Si
2
O
7
Fig.7
XRD patterns of the molten CMAS corrosion of (5RE
0.2
)
2
Si
2
O
7
pellets for different times at 1500℃
Fig.8
Surface morphologies of the molten CMAS corrosion of (5RE
0.2
)
2
Si
2
O
7
pellets for various durations at 1500 °C
Table 3
Atomic ratios (at%) of the corresponding points in
Fig. 8
Fig. 9
Cross-sectional microstructures of the molten CMAS corrosion of (5RE
0.2
)
2
Si
2
O
7
pellets for different times at 1500 °C.
Table 4
Atomic ratios (at%) of the corresponding points in
Fig. 9
Fig. 10
Cross-sectional microstructures and EDS maps of (5RE
0.2
)
2
Si
2
O
7
and Yb
2
Si
2
O
7
pellets after CMAS corrosion for 20 h at 1500 ℃
Fig.11
Reaction layer thickness in (5RE
0.2
)
2
Si
2
O
7
ceramic (a), and average apatite formation rate (μm/h
0.5
) vs. corrosion time
0.5
(h
0.5
) for Yb
2
Si
2
O
7
ceramic (b) pellets during CMAS corrosion for different times at 1500 ℃
