Full
Outline
To improve the service temperature of high-temperature components in engines and search for high-temperature resistant and high thermal insulation thermal barrier coating materials to replace YSZ， a high entropy rare earth zirconate ceramic material is designed based on a multi-element rare earth doping modification strategy， combined with the phase structure formation law， size disorder， and thermal conductivity theory of rare earth zirconate. The A-site high entropy of rare earth zirconate is synthesized using solid-phase synthesis method to prepare two high entropy ceramic materials （Sm0.2Gd0.2Eu0.2Lu0.2Dy0.2）2Zr2O7. The microstructure， phase stability， and thermal physical properties of high entropy ceramic materials are studied. The results indicate that （Sm0.2Gd0.2Eu0.2Lu0.2Dy0.2）2Zr2O7 ceramic material has a defect fluorite structure， a dense ceramic material structure， no obvious defects， and the synthesized ceramic material configuration entropy shows that it belongs to a high entropy system； after sintering at 1400 ℃， the （Sm0.2Gd0.2Eu0.2Lu0.2Dy0.2）2Zr2O7 ceramic material shows no significant grain growth， no precipitation of single oxides phases， and exhibits good high-temperature stability； at 1000 ℃ and 1200 ℃， the thermal conductivity of （Sm0.2Gd0.2Eu0.2Lu0.2Dy0.2）2Zr2O7 ceramic material is 1.781 W·m-1·K-1 and 2.056 W·m-1·K-1， respectively. Compared with conventional rare earth zirconate and YSZ materials， it has lower thermal conductivity and is a promising material for ultra-high temperature thermal barrier coatings.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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