Author Affiliations
State Key Laboratory of Ultra High Temperature Composite Materials, Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, Chinashow less
1. Phase characterizations of high-entropy oxide powders
2. TEM analyses of M2R3O powders
3. Surface and cross-section morphologies of high-entropy oxide coatings
4. XRD patterns of high-entropy oxide coatings
5. Binary phase diagrams of HfO
2-RE
2O
3 and ZrO
2-RE
2O
3 (RE=Sm, Er and Y)
[30] 6. Surface temperature curves of high-entropy oxide coatings during ablation
7. Macro morphologies of high-entropy oxide coatings after ablation
8. Mass ablation ratios and line ablation ratios of high- entropy oxide coatings
9. XRD patterns of high-entropy oxide coatings after ablation
10. Cross-section morphologies and EDS analyses of high-entropy oxide coatings after cyclic ablation for 180 s(a-c) M1R3O; (d-f) M2R3O; (g-i) M3R3O
11. Comparison of ablation resistances between high-entropy oxide coatings and other coatings in the same ablation environment
S1. TEM analysis of M1R3O powders
S2. TEM analysis of M3R3O powders
S3. XRD refinement patterns of high-entropy oxide powders
S4. Thermal conductivities of high-entropy oxides
S5. Surface microstructures of high-entropy oxide coatings after ablation (a-c) M2R3O coatings; (d-f) M3R3O coatings
| Hf | Zr | Sm | Er | Y | Si | O |
---|
Spot A/(%, in atom) | 10.5 | 5.6 | 9.3 | 8.5 | 8.4 | — | 57.7 | Spot B/(%, in atom) | 5.6 | 4.7 | 5.1 | 8.7 | 10.4 | 3.8 | 61.7 |
|
Table 1. EDS element point scanning analysis
Label | Constituent | $\frac{n(\text{Hf}+\text{Zr})}{n(\text{Sm}+\text{Er}+\text{Y})}$ |
---|
M1R3O | (Hf0.125Zr0.125Sm0.25Er0.25Y0.25)O2-δ | 1/3 | M2R3O | (Hf0.2Zr0.2Sm0.2Er0.2Y0.2)O2-δ | 2/3 | M3R3O | (Hf0.25Zr0.25Sm0.167Er0.167Y0.167)O2-δ | 3/3 |
|
Table 1. Compositions and component molar ratios of high-entropy oxides in this study
Parameter | Value |
---|
Current/A | 410-430 | Voltage/V | 100-120 | Primary gas Ar/(L·min-1) | 65-70 | Second gas H2/(L·min-1) | 3.5-5.0 | Powder flow Ar/(L·min-1) | 5-7 | Spray distance/mm | 100 | Powder feed rate/(g·min-1) | 5-6 |
|
Table 2. Parameters of SAPS for high-entropy oxide coatings