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The thermal barrier coatings (TBC) and environmental barrier coatings (EBC) are essential for advanced gas turbine engines, and their development history is briefly reviewed in this article. In order to champion the enormous challenge from much harsher operating conditions in next generation engines, numerous innovations of coating materials and novel designs of coating microstructures have been investigated. The most potential paths to develop new generation TBC and EBC are now becoming increasingly clear. The best novel TBC system may be based bond coat of nanocrystalline γ' phase and top coat of low thermal conductivity La2Zr2O7 or YTaO4, because the former is excellent chemically and mechanically compatible to single crystal Ni−base superalloy substrates, and leads to lower thermal stresses, and the latter is structurally stable at much higher temperatures, and has superior resistance against CMAS attack and high CTE similar to YSZ. One of the best ceramic candidates for thermal / environmental barrier coatings is the high−entropy rare earth silicates based on β−Yb2Si2O7, as it is resistant against CMAS and steam corrosion, and has extremely low thermal conductivity and good CTE match with CMC. A further topic of concern is dual−phase ceramics technologies, which are effective in fracture toughness enhancement and capable of improving corrosion resistance and thermal barrier capability.
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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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