The Effect of Pt Content on the Scale Development on β-NiAl at Very Early Oxidation Stages

Pt effect on early stage oxidation behaviour of Pt-diffused γ-Ni/γ’-Ni3Al coatings

“…Platinum addition has been shown to alter the transformation dynamics of θ-Al2O3 to α-Al2O3 [12,13]. However, the precise mechanism for this is still unclear.…”

“…Therefore, it is important to investigate the early stage oxidation behaviour for a reliable estimation of TGO performance. However, despite the large number of studies about Pt effect on long-term oxidation as mentioned above, only limited attempts [11][12][13][14] have focused on the impact of Pt on early stage of oxidation behaviour of Ni-Al alloys or coatings. In addition, some controversial views regarding Pt effect on the early stage θ-Al2O3 to α-Al2O3 transformation have been reported.…”

“…In addition, some controversial views regarding Pt effect on the early stage θ-Al2O3 to α-Al2O3 transformation have been reported. For instance, J. Jedlinski et al [12] found that Pt resulted in earlier development of α-Al2O3 (faster θ-to αalumina transition) for β-NiPtAl alloy at 1100°C oxidation, whereas Y. Cadoret, et al [13] concluded that Pt can slow down θ-Al2O3 to α-Al2O3 transition by studying the early stage oxidation of Ni50Al50 and Ni40Pt10Al50 alloys at 900 and 1100°C, respectively. H. Svensson and co-workers [14] concluded that Pt has no effect on this phase transformation by studying the initial oxidation of β-NiPtAl alloys.…”