Segmentation cracks in plasma spray coatings: Formation dynamics and chracterization

Conference Dates

June 24-29, 2018


Segmentation cracks in Air Plasma Sprayed (APS) Thermal Barrier Coatings (TBCs) have been recognized as crucial micro-structural asset for increasing the in-plane strain tolerance of the coatings and thus enhancing the TBC durability. These vertically cracked coatings also show excellent in-plane fracture toughness. This combination has allowed wide spread use of these coatings in gas turbine engines. Although industrially successful, there is limited scientific studies on the formation dynamics of such cracks, and their relationship to process conditions and performance. This is especially of importance as efforts are underway to find alternative to Yttria Stabilized Zirconias for higher temperature thermal barrier applications.

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