The Interdiffusion Behavior of NiCoCrAlYHf Coating Deposited by Arc Ion Plating on Carburized Ni-Based Single Crystal Superalloy

In the present study, arc ion plating (AIP) was used to prepare a NiCoCrAlYHf coating (HY5 coating) on a carburized third-generation single-crystal superalloy DD10. The interdiffusion behavior of the carburized superalloy with an HY5 coating was investigated for a 1000 h oxidation time at 1100 °C. Carburization enhanced the interfacial bonding force and improved the microstructure of the NiCoCrAlYHf coating. An interdiffusion zone (IDZ) formed after a 300 h oxidation time, and the formation of a carburized layer effectively suppressed an inward diffusion of cobalt, aluminium, and chromium to the DD10 superalloy as well as an outward diffusion of nickel and refractory elements for instance rhenium and tungsten to the HY5 coating that occurred in static air at 1100 °C. The roles of the carburized layer in affecting thermal cyclic oxidation and element interdiffusion were studied. Subsequently, a modified form of the Boltzmann–Matano analysis was used to present the interdiffusion coefficients of aluminium.

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Hot corrosion of arc ion plating NiCrAlY and sputtered nanocrystalline coatings on a nickel-based single-crystal superalloy

Corrosion Science ◽

10.1016/j.corsci.2017.04.004 ◽

2017 ◽

Vol 123 ◽

pp. 27-39 ◽

Cited By ~ 31

Author(s):

Jinlong Wang ◽

Minghui Chen ◽

Yuxian Cheng ◽

Lanlan Yang ◽

Zebin Bao ◽

...

Keyword(s):

Single Crystal ◽

Hot Corrosion ◽

Single Crystal Superalloy ◽

Arc Ion Plating ◽

Ion Plating

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Isothermal Oxidation of Pt Modified and Ru Modified Aluminide Coating on a Fourth Generation Single Crystal Superalloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.522-523.301 ◽

2006 ◽

Vol 522-523 ◽

pp. 301-308

Author(s):

Yuki Matsuoka ◽

Yasuo Matsunaga ◽

Kiyokazu Nakagawa ◽

Shigeji Taniguchi

Keyword(s):

Single Crystal ◽

Aluminide Coating ◽

Isothermal Oxidation ◽

Single Crystal Superalloy ◽

Fourth Generation ◽

Outward Diffusion ◽

Secondary Reaction Zone ◽

Refractory Elements ◽

Topologically Close Packed ◽

Pt Modification

Isothermal oxidation behavior of a 4th generation Ni-base single crystal superalloy with Pt-modified and Ru-modified aluminide coating was examined in a temperature range 1223 to 1373 K in air. Both Pt and Ru modification improve the oxidation resistance of a simple aluminide coating, especially above 1273 K. They allow thin protective and continuous Al2O3 scales to be intact for at least 500 h at temperatures up to 1323 K. However, the Pt modification drastically accelerates the formation of a secondary reaction zone (SRZ). This suggests that Pt promotes the formation of a topologically close-packed phase by lowering the solubility of refractory elements in γ-Ni. In contrast, the Ru modification reduces the SRZ, and is expected to enhance the phase stability under the coating by preventing the depletion of Ru due to its outward diffusion.

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