Abstract
Thermal barrier coatings (TBCs) play a vitally important role in protecting the hot parts of a gas turbine from high temperature and corrosion effectively. More and more attention has been paid to the performance modification of ZrO2-based ceramics and seeking for new ceramic materials to meet requirements of gas turbine TBCs. The working principle, merits, and demerits of main technologies for coating preparation are elaborated in this paper, and the properties of new ceramic materials are reviewed. It is found that the thermal conductivity, thermal stability, mechanical properties, and other performances of traditional ZrO2-based ceramics could be improved effectively by doping modification. The emphases for new ceramic materials research were put on pyrochlores, magnetoplumbites, rare-earth tantalates, etc. Rare-earth tantalates with great potentials as new top ceramic materials were described in detail. In the end, the development directions of advanced top ceramic coatings, combining doping modification with preparation technology to regulate and control structure property of high-performance ceramic material, were put forward.
Highlights
High-performance gas turbines have been widely used as power sources for aircrafts, large ships, and electric power production [1]
ZrO2as sintering, corrosion, phase transformation, oxidation that occur based ceramic materials are in service, many researchers have tried to use various mateZrO2 -based ceramic materials are in service, many researchers have tried to use various rials to modify themthem by doping, hoping to further improve theirtheir service life. life
In the development of high-performance thermal barrier coatings (TBCs), in addition to the modification reIn the development of high-performance TBCs, in addition to the modification research of ZrO2 ceramic coating, some new top ceramic materials have been explored
Summary
High-performance gas turbines have been widely used as power sources for aircrafts, large ships, and electric power production [1]. Mehboob of new top ceramic materials, on the one hand, researchers doped ZrO2 -based ceramic et al [25] summarized the deterioration mechanism of TBCs and strategies to extend their materials to improve their high-temperature resistance, corrosion resistance, and other service life, and introduced some new ceramic materials with lower thermal conductivity properties, such as Gd2 O3 , Yb2 O3 , Nd2 O3 , Sc2 O3 , etc., on the other hand, they actively and greater stability higher to temperatures, such zirconates and stannates develop new ceramicatmaterials replace 6–8YSZ so asastorare-earth meet the needs of development,. Thakare et al [26]ofretrospected preparation techniques current developThe research and development these new TBCs have greatly improved and the performance and life of high-temperature end service materials. Schematic diagram of the penetration process of CaO-MgO-Al2O3-SiO2 (CMAS) into atmospheric plasma sprayTBCs [4]: (a) Structure of TBCs, (b) CMAS depositing on the TBCs surface, (c) Liquefied CMAS penetrating the ic coating
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