A study on characterization of pack-cemented aluminide coating on metals

AbstractTo investigate phase evolution of β-(Ni,Pt)Al/γ-(Ni3Al) in thermal barrier coating bond coat systems, specimens were subjected to 1200°C cyclic and isothermal heating. By removing the thermally grown oxide (TGO) after every 10 hours of heating, aluminum (Al) depletion from the bond coat was accelerated. Non-accelerated and accelerated Al-depletion samples were examined with scanning electron microscopy after every 10 hours of cyclic and isothermal heating. Observations from after the first 10 hours of thermal exposure show distinct microstructural differences. After 50 hours of heating, cyclic accelerated Al-depletion samples show more distinct grain boundaries and a higher proportion of-(Ni3Al) phase than isothermalaccelerated Al-depletion samples. Through instrumented micro-indentation, trends in elastic modulus were determined for isothermal and cyclic accelerated Al-depletion specimens.

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Microstructural and topographical characterization of the pack cemented aluminide coating applied on Inconel-600

Surface Topography Metrology and Properties ◽

10.1088/2051-672x/ac00fa ◽

2021 ◽

Author(s):

Sina Mahini ◽

Shahin Khameneh Asl ◽

Taher Rabizadeh ◽

Hossein Aghajani

Keyword(s):

Aluminide Coating ◽

Inconel 600

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Characterization of Si-aluminide coating and oxide scale microstructure formed on γ-TiAl alloy during long-term oxidation at 950 °C

Intermetallics ◽

10.1016/j.intermet.2017.04.015 ◽

2017 ◽

Vol 87 ◽

pp. 81-89 ◽

Cited By ~ 24

Author(s):

R. Swadźba ◽

L. Swadźba ◽

B. Mendala ◽

B. Witala ◽

J. Tracz ◽

...

Keyword(s):

Oxide Scale ◽

Tial Alloy ◽

Aluminide Coating

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Erratum to “Characterization of the degraded microstructures of a platinum aluminide coating” [Mater. Sci. Eng. A 360 (2003) 7–17]

Materials Science and Engineering A ◽

10.1016/j.msea.2004.10.024 ◽

2005 ◽

Vol 393 (1-2) ◽

pp. 399-400 ◽

Cited By ~ 3

Author(s):

H.J. Kim ◽

M.E. Walter

Keyword(s):

Aluminide Coating ◽

Platinum Aluminide

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Characterization of the Microstructural Degradation of Platinum Modified Aluminide Coating

Materials Science Forum ◽

10.4028/www.scientific.net/msf.755.29 ◽

2013 ◽

Vol 755 ◽

pp. 29-38 ◽

Cited By ~ 2

Author(s):

M.A. González ◽

D.I. Martínez ◽

C.T. Saucedo ◽

I. Guzmán ◽

J.C. Díaz

Keyword(s):

Degradation Mechanism ◽

Aluminide Coating ◽

Turbine Blades ◽

Diffusion Coating ◽

Two Phase ◽

Phase Coating ◽

Blade Failure ◽

Conventional Microscopy ◽

Al Coating

This work presents the degradation mechanism of the platinum modified aluminide diffusion coating of the GTD 111 SC Ni-base superalloy turbine blades after 16000 h of exposition at different thermal cycles (critical heating temperatures reported ~1000°C and 1120°C). The initial coating condition and the evolution of degradation were characterized applying conventional microscopy and backscatter scanning electron microscopy. The initial microstructure condition consisted of a two phase coating (intermetallics PtAl2 dispersed in a matrix β-(Ni,Pt)Al). The major microstructure degradation was associated with: intermediate and interdiffusion zones growing, partial transformation of β-(Ni,Pt)Al to γ´-Ni3Al, and the dissolution of the intermetallic PtAl2 resulting in a more brittle single phase β-(Ni,Pt)Al coating. The degradation facilitates spallation and crack initiation, resulting in the loss of the coating and by consequence the blade failure.

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