The effect of CMAS interaction on thermal cycle lifetime of YSZ based thermal barrier coatings

Research on crack propagation behaviour of EB-PVD TBCs based on TGO evolution

“…Doleker and Ozgurluk et al 7,11,12 have conducted a series of researches on studying the TGO growth and kinetic behaviors of different ceramic top coat structures, results show that coatings composed of lanthanide oxide such as La 2 Zr 2 O 7 and Gd2Zr 2 O 7 exhibit better performance because of the lower oxygen permeability. While Bal et al 13,14 proved that CMAS (CaO 2 , MgO 2 , Al 2 O 3 , SiO 2 ) and hot corrosion to the TBCs can also bring a negative influence on the TGO kinetic behaviour and interfacial bonding strength. TGO growing process compared by different thermal oxidation temperatures has also been analyzed by Parlakyigit et al 15 .…”

Effect of test parameters in the exposure of Ca–Mg–Al–silicate on yttria stabilized zirconia

“…3,4 CMAS can degrade the coating system by infiltrating the coating, stiffening the microstructure upon cooling and reducing compliance and/or dissolving the coating and reacting to form secondary products. [5][6][7][8][9][10][11][12][13][14][15][16][17] In these systems, the secondary products are largely controlled by the amount of RE content of the coating material. Some secondary products, like Ca 2 RE 8 (SiO 4 ) 6 O 2 apatites, form as a protective barrier against further CMAS infiltration and are considered a viable mitigation strategy.…”

“…With the increase in engine operating temperatures, of particular interest is the infiltration and reaction of calcium–magnesium–aluminosilicate (CMAS) glass caused by the ingestion of silicious particulates such as desert sand or volcanic ash 3,4 . CMAS can degrade the coating system by infiltrating the coating, stiffening the microstructure upon cooling and reducing compliance and/or dissolving the coating and reacting to form secondary products 5–17 . In these systems, the secondary products are largely controlled by the amount of RE content of the coating material.…”

CMAS Corrosion Behavior of Nanostructured YSZ and Gd-Yb-Y-Stabilized Zirconia Coatings

“…To find and develop coatings with improved resistance to CMAS corrosion, research institutes have focused substantial research in the following directions: first, developing novel ceramic coating materials, such as RE 2 Zr 2 O 7 [13][14][15], REPO 3 [16], Ti 2 AlC [17], and Hf 6 Ta 2 O 17 [18]; second, doping YSZ with oxides, including rare earth oxide-doped YSZ [19,20] and Al-and Ti-doped YSZ [21][22][23]; third, depositing protective layers on the surface of the coatings, such as the Pt layer [24] and Al 2 O 3 layer [25]; fourth, designing dual-layer ceramic coating structures, such as Gd 2 Zr 2 O 7 /YSZ [26,27] and La 2 Ce 2 O 7 /YSZ [28]; fifth, optimization treatments on the surface of the ceramic coatings, such as reducing the surface roughness of coatings [29], laser modification [30], and creating micro-nano double-scale structure [31].…”