2021
DOI: 10.1115/1.4049414
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Environmental Barrier Coating Oxidation and Adhesion Strength

Abstract: Plasma Spray- Physical Vapor Deposition (PS-PVD) environmental barrier coatings (EBCs) of Yb2Si2O7 were deposited on SiC and exposed in a steam environment (90% H2O/O2) at 1426°C to form a thermally grown oxide (TGO) layer between the substrate and EBC. In advanced ceramic material systems such as coated ceramic matrix composites (CMCs), the TGO layer is the weak interface in coated CMC systems and directly influences component lifetimes. The effect of surface roughness and TGO thickness on the adhesion streng… Show more

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Cited by 22 publications
(11 citation statements)
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“…29,30 The physics of resin flow into a mold under pressure is similar to the seepage problem and so similar approaches have been used also to model the flow of resin into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] The models are used in these cases to determine the resin flow front and mold filling times corresponding to different infiltration conditions.…”
Section: Methodsmentioning
confidence: 99%
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“…29,30 The physics of resin flow into a mold under pressure is similar to the seepage problem and so similar approaches have been used also to model the flow of resin into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] The models are used in these cases to determine the resin flow front and mold filling times corresponding to different infiltration conditions.…”
Section: Methodsmentioning
confidence: 99%
“…31 Implementation in stationary industrial gas turbines (IGTs) is arguably a more difficult task, as required component lifetimes are on the order of ≥30 kh. 2,32 Although TGO formation kinetics as a life-limiting parameter 33,34 have yet to be established, it is critical to establish a methodology capable of gauging EBC effectiveness in reducing underlying silica formation.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Harder F I G U R E 3 (A) Schematic illustration of sample assembling, and (B) possible failure sites for adhesive strength test by tensile method. 52 et al 53 tested the adhesive strength of single-layer Yb 2 Si 2 O 7 EBCs on bulk SiC substrate with different oxidation times using a tensile method, and they found a rapid decrease in the adhesive strength due to the generation of TGO during the oxidation process. It is a direct indication that slowing down the growth of TGO can extend the lifetime of the coating.…”
Section: Adhesionmentioning
confidence: 99%
“…Therefore, testing more samples is necessary in order to obtain a reliable value of adhesive strength. Harder et al 53 . tested the adhesive strength of single‐layer Yb 2 Si 2 O 7 EBCs on bulk SiC substrate with different oxidation times using a tensile method, and they found a rapid decrease in the adhesive strength due to the generation of TGO during the oxidation process.…”
Section: Basic Propertiesmentioning
confidence: 99%