High-temperature interface stability of tri-layer thermal environmental barrier coatings

Optimization of spraying process and stoichiometric stage of plasma‐sprayed Yb2Si2O7 environmental barrier coating

“…reported that plasma‐sprayed Yb 2 SiO 5 /Yb 2 Si 2 O 7 /Si EBCs had excellent thermal shock resistance at 1350°C, and most of the penetrating cracks in Yb 2 SiO 5 coating stopped spreading at the Yb 2 SiO 5 –Yb 2 Si 2 O 7 interface 16 . APS is one of the common methods for the preparing EBCs due to its high deposition efficiency and economy 16–20 . However, due to the high temperature of plasma flame flow, it is easy to cause the decomposition of spraying powder to produce new phases with large CTE 11,16–17 .…”

“…According to the literature reports, [14][15][16][17] 16 APS is one of the common methods for the preparing EBCs due to its high deposition efficiency and economy. [16][17][18][19][20] However, due to the high temperature of plasma flame flow, it is easy to cause the decomposition of spraying powder to produce new phases with large CTE. 11,[16][17] At the same time, cracks and pores will occur in plasma-sprayed Yb 2 Si 2 O 7 coating, which will reduce mechanical properties and high-temperature water-oxygen corrosion resistance.…”

Corrosion behavior and mechanism of ytterbium silicates environmental barrier coatings subjected to thermal cycling in water vapor

“…[4][5][6] Rare-earth silicates, especially Yb 2 SiO 5 (YbMS) and Yb 2 Si 2 O 7 (YbDS), have been considered as promising EBC materials due to their low coefficient of thermal expansion (CTE), superior high-temperature stability, and water vapor corrosion resistance. [6][7][8][9][10][11][12][13] The performance of corrosion resistance, such as high-temperature water vapor and calcium-magnesium-alumino-silicates (CMAS), is essential to the applications of rare-earth silicates as EBCs. Nasiri et al reported that the bulk RE 2 SiO 5 (RE = Y, Er, Yb, Lu) reacted with water vapor to form disilicate at 1350 • C in static air with 90% water vapor.…”