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8%（mass fraction）Y2O3 partially stabilized zirconia （8YSZ） is a currently commonly-used top-coat material for thermal barrier coatings （TBCs） applied to turbine blades in aero-engines. However， its volume change induced by high-temperature phase transitions above 1200 ℃ can easily lead to cracking and failure of TBCs. Sc2O3 is employed as an alternative stabilizer to fabricate 8%Sc2O3-92%ZrO₂（mole fraction） ceramics （8SSZ） via a solid-state synthesis method. The thermophysical properties of 8SSZ and conventional 8YSZ， including thermal expansion coefficient （CTE）， thermal conductivity， and high-temperature phase/grain stability， are systematically compared. The results show that after heat treatment at 1400 ℃ in a muffle furnace， the CTE of 8SSZ measured by a dilatometer ranges from 8.91×10-6 K-1 to 10.7×10-6 K-1， which is comparable to that of 8YSZ. Thermal conductivity tests reveal that 8SSZ exhibits a thermal conductivity of 2.59 W/（m·K）， approximately 20% lower than that of 8YSZ. X-ray diffraction （XRD） and scanning electron microscopy （SEM） results demonstrate that 8SSZ maintains phase stability without phase transitions after 500 h at 1400 ℃， outperforming 8YSZ in high-temperature phase stability. However， 8SSZ still exhibits the issue of excessive grain growth.
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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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