| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1656327 | Surface and Coatings Technology | 2016 | 10 Pages |
•γ' Ni3Al bond coats resist rumpling during cyclic oxidation tests to 1204 °C.•Fourier transform of surface profile scan quantifies rumpling.•γ' coating resist TGO spallation more than (Pt,Ni)Al despite faster oxidation.•High strength and creep resistance of Ni3Al provides rumpling resistance.
The behavior of two new high-strength γ'-Ni3Al-base bond coats have been compared to a baseline β-(Pt,Ni)Al bond coat via thermal cycling to a maximum temperature of 1204 °C. The rumpling amplitude of the γ' coating is significantly lower than the (Pt,Ni)Al as characterized by a nondestructive optical profilometry technique. The γ' coatings resist rumpling and spallation of the thermally grown oxide in spite of faster oxidation compared to Pt-modified NiAl. This behavior is analyzed using an analytical rumpling model to explain that the improved bond coat strength is the major contributing factor to rumpling inhibition.
