Abstract
The adhesion of alumina scale to the metal substrate Zr-doped β-NiAl is studied to determine the effects of the alloy substrate and bond coat on the adhesion. Three general factors contributed to the ideal scale formation and adhesion: no major redistribution of alloying elements within the metal substrate; segregation of Zr to the metal-scale interface and the scale grain boundaries; and ability to tolerate stresses generated in the scale. Several potential strategies are suggested to form more adherent alumina scales in practical thermal barrier coating systems: add more Al to aluminide coatings; investigate bond coat microstructures or phases; identify the elements detrimental to scale adhesion; and add reactive elements to PtAl coatings.
Original language | English |
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Pages (from-to) | 109-125 |
Number of pages | 17 |
Journal | NASA Conference Publication |
Issue number | 207429 |
State | Published - May 1998 |
Event | Proceedings of the 1997 Thermal Barrier Coating Workshop - Cincinnati, OH, USA Duration: 19 May 1997 → 21 May 1997 |