Hot corrosion behavior of Y4Al2O9 ceramics for thermal barrier coatings exposed to calcium-magnesium-alumina-silicate at 1250 °C

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

“…Yttrium aluminum garnet (Y 3 Al 5 O 12 , YAG) has excellent stability under 2243 K, with thermal expansion coefficient being 7.5-9.1 × 10 −6 /K, Vickers hardness being 16.5-17 GPa, fracture toughness being 1.8 MPa•m 1/2 (298 K). With a strong creep resistance, its low oxygen permeability makes bond coat hard to oxidating, and it hardly reacts with CMAS [131,132]. Although its thermal conductivity is slightly higher (2.4-3.1 W/(m•K)) at high temperature, it can be greatly reduced through the structure design (0.91 W/(m•K), 1273 K) [133].…”

Y1/6Yb5/6TaO4/8YSZ composite ceramics with enhanced mechanical and thermal properties

“…In recent decades, researchers have been focused on developing new TBC materials. Several potential TBCs, for example, Y 4 Al 2 O 9 , RE 2 M 2 O 7 , RE 2 SiO 5 , RE 2 SiO 7 , RE TaO 4 , and RE 3 TaO 7 , where RE = Y, Pr, Sm, Eu, Yb, Gd, and Tm and M = Zr, Ce, Ti, Mo, and Sn, have been proposed 10–24 . In 2007, Clarke and Levi proposed YTaO 4 as a promising TBC because its ferroelasticity is similar to that of yttria‐stabilized zirconia (YSZ) 25 .…”

“…Several potential TBCs, for example, Y 4 Al 2 O 9 , RE 2 M 2 O 7 , RE 2 SiO 5 , RE 2 SiO 7 , RETaO 4 , and RE 3 TaO 7 , where RE = Y, Pr, Sm, Eu, Yb, Gd, and Tm and M = Zr, Ce, Ti, Mo, and Sn, have been proposed. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] In 2007, Clarke and Levi proposed YTaO 4 as a promising TBC because its ferroelasticity is similar to that of yttriastabilized zirconia (YSZ). 25 Since then, tantalates have gained considerable attention, inducing more research on the subject.…”