Oxidation resistance of Pt-modified γ/γ′ Ni-Al at 1150°C

Ford, S.I.; Kartono, R.; Young, David J.

doi:10.1016/j.surfcoat.2009.08.027

Cited by 12 publications

(4 citation statements)

References 13 publications

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“…Indeed, Ford and al. [55] have shown in a study on Pt-rich γ-γ′ alloys, that a content of Hf higher than 0.25 at.% and lower than 0.8 at.% (optimum at 0.5 at.%) was necessary to obtain the slowest oxidation kinetics. Nevertheless, their study was done on massive samples, at 1150 °C and with more Pt (30 at.%) which allows a higher solubility of Hf [16].…”

Section: Adherentmentioning

confidence: 99%

Thermal cycling behavior of EBPVD TBC systems deposited on doped Pt-rich γ–γ′ bond coatings made by Spark Plasma Sintering (SPS)

Selezneff

Boidot

Hugot³

et al. 2011

Surface and Coatings Technology

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Section: Adherentmentioning

confidence: 99%

Thermal cycling behavior of EBPVD TBC systems deposited on doped Pt-rich γ–γ′ bond coatings made by Spark Plasma Sintering (SPS)

Selezneff

Boidot

Hugot³

et al. 2011

Surface and Coatings Technology

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“…However, co-deposition has been proven to be problematic [31,46]. Thus much of what is known about Hf effects in -NiAl had initially been gained from Hf-doped model cast alloys or where the Hf-doping was accomplished by substrate interdiffusion or pre-sputtered Hf [28,[47][48].…”

mentioning

confidence: 99%

Oxidation Behavior of Hf-Modified Aluminide Coatings on Inconel-718 at 1050°C

Wang¹,

Smialek²,

Suneson³

2014

J. Coat. Sci. Technol.

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Al were cyclic oxidation tested at 1050°C in air on Inconel-718 substrates for up to 4370h. The Pt-diffused specimen failed most quickly, < 100 h, while the simple-NiAl aluminide maintained a positive weight change for ~1300 h. The Pt-modified aluminides clearly improved the cyclic oxidation behavior of both simple and Hf-modified aluminides, sustaining a zero weight change only after 3600 and 4000 h, respectively. The Hf additions did not immediately appear to produce as strong an improvement as expected, however, they were more highly ranked when normalized by coating thickness. They also decreased surface rumpling, important for TBC durability. Hf-rich NiAl grain boundaries, formed during coating processing, resulted in HfO2 particles in the scales and oxide pegs at the metal interface, all suggesting some level of over-doping. The high sulfur content of the substrate influenced spalling to bare metal and re-healing to less protective Ni(Al,Cr)2O4 spinel-type and (Ti,Cr,Nb)O2 rutile scales. The evolution of these surface features have been documented over 100 to 4370 h of exposure. The coating aluminum content near failure was ~2-3 wt. %.

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“…This slightly lower k p obtained for the AM1 could be attributed to the presence of hafnium in the AM1 alloy. Indeed, Hf can be found in grain boundaries of α-Al 2 O 3 [6] and is known to have a beneficial effect on the oxidation kinetics of Ni-Al [31,32].…”

Section: Isothermal Oxidationmentioning

confidence: 99%