Substrate and bond coat compositions: Factors affecting alumina scale adhesion

Bruce Pint, Ian Wright, Woo Lee, Ying Zhang, Karin Prussner, Kathleen Alexander

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

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 languageEnglish
Pages (from-to)109-125
Number of pages17
JournalNASA Conference Publication
Issue number207429
StatePublished - May 1998
EventProceedings of the 1997 Thermal Barrier Coating Workshop - Cincinnati, OH, USA
Duration: 19 May 199721 May 1997

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