Estudio De La Evolución De Esfuerzos Residuales Debido Al Ataque De Depósitos Vítreos (Cmas) en Recubrimientos De Barrera Térmica

Determination of residual stresses in thermal barrier coating due to the amount of CMAS infiltration

“…This relationship is paramount because help us to determine the critical stated of the TBC before delamination, detachment or even a total destruction of the TBC. In this study, the residual stress profile of the ceramic layer (TC) of a thermal barrier coating due to CMAS infiltration was determined using the Modified Layer Removal Method [22] and the method of Noda et al [23]. We show the effect of the relationship between the amount of CMAS infiltrated and the magnitude of the residual stress profile.…”

“…On the other hand, the TC was deposited by an APS system, model 9MB by Sulzer, with a powder feed rate of 45 g/min and a distance of 90 mm. The voltage and current of the gun were set at 67 V and 600 A, respectively [23]. The mean thickness of this layer was 180±5 µm.…”

“…To calculate the residual stresses on the coatings, the physical properties of the materials were used (AISI 304), BC (CoNiCrAlY) y TC (YSZ), shown in Table 3. The profile of the residual stress in the TBCs was determined by the technique MRCMRB [22] and Noda Equations [23].…”

“…The Noda equations [23] were taken as the basis for determining residual stresses due to the difference between thermal expansion coefficients between TC, BC and substrate (Thermal Stress), as shown below.…”