Understanding the influence of microstructure on hot corrosion and erosion behavior of suspension plasma sprayed thermal barrier coatings
نویسندگان
چکیده
Thermal barrier coatings (TBCs) are bilayer systems comprising a 7–8 wt% yttria partially stabilized zirconia (YSZ) top coat deposited over metallic bond coat. Suspension plasma spraying (SPS) is an advanced and attractive processing technique due to its capability yield variety of microstructures, including the desired columnar microstructure for enhanced strain tolerance durability. This work attempts investigate desirable microstructural features in SPS processed TBCs mitigate hot corrosion minimize erosion related losses that often responsible coating degradation. were utilizing three different spray conditions obtain distinct (column density, interpass [IP] porosity bands, column width), content, mechanical properties. Apart from comprehensive characterization SEM, XRD micro-indentation tests, as-deposited subjected hot-corrosion tests presence vanadium pentoxide sodium sulfate as corrosive salts. Post-corrosion analysis revealed complete infiltration molten salts all investigated TBCs. However, delamination cracks generated infiltrated species minimal case with higher fracture toughness. The differences properties also led performance, possessing total content high toughness best resisting damage. Post-erosion micro-hardness showed superior resistance. Based on results subsequent post-mortem failed specimens, plausible damage mechanisms proposed. Findings this provide new insights developing tolerant microstructures durability when exposed environments. • varying deposited. Influence parameters (suspension feed rate, distance, etc.) examined. Desirable identified corrosion.
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ژورنال
عنوان ژورنال: Surface & Coatings Technology
سال: 2021
ISSN: ['1879-3347', '0257-8972']
DOI: https://doi.org/10.1016/j.surfcoat.2021.127306