Experimental and thermodynamic analysis of differences in phase transformation of Pt-modified nickel aluminide coating during isothermal and cyclic oxidation

Ru coating prior to aluminizing is one of the effective methods to reduce the harmful intermediate layer that forms under the coating (SRZ) on a 4th generation Ni-base SC superalloy. This study examined the short-term isothermal oxidation behavior of this Ru-modified coating at 1373 K in air. Surface observation by SEM showed that the scale becomes flat and uniform in comparison to simple aluminide coating. XRD and cross-sectional analysis results also showed that phase transformation from β-NiAl to γ’-Ni3Al seldom occurs in the Ru-modified coating layer leading to the prevention of local oxidation.

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Cyclic-Oxidation of RexOy-Modified Aluminide Coating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.557-559.1721 ◽

2012 ◽

Vol 557-559 ◽

pp. 1721-1726

Author(s):

Yong Dong Wang ◽

Yue Bo Zhou

Keyword(s):

Composite Film ◽

Cyclic Oxidation ◽

Aluminide Coating ◽

Pack Cementation ◽

Reactive Element ◽

Aluminide Coatings ◽

Oxidation In Air

Reactive reactive element oxide RexOy (Re=Ce, Y)-modified aluminide coatings were developed by aluminizing the as-codeposited Ni-RexOy composite film using pack cementation method at 1100°C for 4 h. By comparison, aluminizing was also performed with the same condition on an as-deposited Ni film without RexOy particles. SEM/EDAX and TEM results indicated that the co-deposited CeO2 or Y2O3 particls were homogeneously dispersed in the finer-grain nanocrystalline Ni grains. The cyclic oxidation in air at 900°C indicated that the RexOy -modified aluminide coatings were profoundly spallation resistance as compared to the RexOy -free coatings due to the formation of a continuous adherent α-Al2O3 scale.

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Increase in ductility of Pt-modified nickel aluminide coating with high temperature ageing

Acta Materialia ◽

10.1016/j.actamat.2015.12.008 ◽

2016 ◽

Vol 105 ◽

pp. 505-518 ◽

Cited By ~ 16

Author(s):

Vladimir A. Esin ◽

Vincent Maurel ◽

Paul Breton ◽

Alain Köster ◽

Serge Selezneff

Keyword(s):

High Temperature ◽

Nickel Aluminide ◽

Aluminide Coating ◽

Temperature Ageing

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Improving cyclic oxidation resistance of Ni3Al-based single crystal superalloy with low-diffusion platinum-modified aluminide coating

Journal of Material Science and Technology ◽

10.1016/j.jmst.2020.05.007 ◽

2020 ◽

Vol 54 ◽

pp. 132-143 ◽

Cited By ~ 1

Author(s):

H. Liu ◽

M.M. Xu ◽

S. Li ◽

Z.B. Bao ◽

S.L. Zhu ◽

...

Keyword(s):

Single Crystal ◽

Oxidation Resistance ◽

Cyclic Oxidation ◽

Aluminide Coating ◽

Single Crystal Superalloy

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Comparison of Isothermal with Cyclic Oxidation Behavior of “Cr-Aluminide” Coating on Inconel 738LC at 900 °C

Oxidation of Metals ◽

10.1007/s11085-016-9657-5 ◽

2016 ◽

Vol 87 (1-2) ◽

pp. 57-74 ◽

Cited By ~ 4

Author(s):

M. Salehi Doolabi ◽

B. Ghasemi ◽

S. K. Sadrnezhaad ◽

A. Feizabadi ◽

A. HabibollahZadeh ◽

...

Keyword(s):

Cyclic Oxidation ◽

Oxidation Behavior ◽

Aluminide Coating ◽

Inconel 738Lc

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Effect of Hf Addition on High Temperature Properties of Ir-Containing Alloy Coatings

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.1689 ◽

2007 ◽

Vol 546-549 ◽

pp. 1689-1694 ◽

Cited By ~ 2

Author(s):

Hideyuki Murakami ◽

K. Kamiya ◽

Akihiro Yamaguchi ◽

Ying Na Wu ◽

Seiji Kuroda

Keyword(s):

High Temperature ◽

Cyclic Oxidation ◽

Flat Surface ◽

Small Difference ◽

Aluminide Coating ◽

High Temperature Properties ◽

Aluminide Coatings ◽

Cyclic Oxidation Test ◽

Hf Addition ◽

Pack Cementation Process

In the present study, high temperature properties of Ir-modified and Ir-Hf-modified aluminide coatings on Ni-based single crystal superalloy TMS-82+ were discussed. They were prepared by depositing pure Ir and Ir-Hf alloys on TMS-82+ using magnetron sputtering and EB-PVD, followed by a conventional Al-pack cementation process. The effects of Hf addition on the oxidation resistance and top-coat spallation resistance were investigated. Cyclic oxidation test at 1423K for 1h as one heating cycle revealed that while there is a small difference in oxidation kinetics and spallation lives between Ir and Ir-Hf coatings, drastic difference in surface morphology was observed. After 50 oxidation cycles the Ir-modified aluminide coating showed surface rumpling whereas the Ir-Hf modified aluminide coatings kept the flat surface. It was also revealed that excessive addition of Hf promoted the internal oxidation, resulting in the deterioration of substrates. These results agree with the conventional Pt-modified aluminide coatings and Ni-Al-Hf alloys.

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