Journal
CORROSION SCIENCE
Volume 168, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108587
Keywords
Thermal barrier coatings; Hexagonal boron nitride; Volcanic ash; Non-wetting; Silica-phobicity
Funding
- Freigeist Fellowship of the Volkswagen Stiftung on Volcanic Ash Deposition in Jet Engines [89705]
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Yttria-stabilized zirconia thermal barrier coatings (YSZ TBCs) are prone to degradation by atmospheric contaminants such as volcanic ash, posing a serious threat to their durability. Here we demonstrate that hexagonal boron nitride (h-BN) additives to YSZ coatings (h-BN YSZ), exhibit resistance against volcanic ash interaction at 1250 degrees C. In preliminary tests performed under vacuum, h-BN YSZ coatings demonstrate greatly inhibited wetting against molten volcanic ash drops. Under oxidizing conditions, h-BN YSZ provide enhanced wetting and chemical resistance over conventional coatings. This study lays groundwork for the development of novel additives which are physico-chemically resilient against molten volcanic ash wetting.
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