Oxidation resistance: One barrier to moving beyond Ni-base superalloys

Pint, Bruce A.; DiStefano, J.R.; Wright, I.G.

doi:10.1016/j.msea.2005.09.091

Cited by 129 publications

(73 citation statements)

References 53 publications

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“…[18]. Since the Mo 5 Si 3 phase is difficult to stabilize under the conditions described by Yang et al [17], Fe as further minor alloying element was added by Azim et al [15] [19].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Oxidation Resistance of Mo–Si–B–Ti Alloys by Pack Cementation

et al. 2017

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Abstract.As new high temperature structural materials, Mo-Si-B alloys satisfy several requirements such as oxidation and creep resistance. Recently, novel Ti-rich Mo-Si-B alloys have shown an increased creep resistance compared to Ti-free alloys. However, due to the formation of a duplex SiO 2 -TiO 2 oxide layer, which allows for fast ingress of oxygen, the oxidation resistance is poor. To improve the oxidation resistance a borosilicate based coating was applied to a Mo-12.5Si-8.5B-27.5Ti (in at.%) alloy. After co-deposition of Si and B by pack cementation at 1000 °C in Ar, a conditioning anneal at 1400 °C is used to develop an outer borosilicate layer followed by an inner MoSi 2 and Mo 5 Si 3 layer. During both isothermal and cyclic oxidation after an initial mass loss during the first hours of exposure, a steady state is reached for times up to 1000 h at temperatures ranging from 800 to 1200 °C demonstrating a significantly enhanced oxidation resistance.

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“…[18]. Since the Mo 5 Si 3 phase is difficult to stabilize under the conditions described by Yang et al [17], Fe as further minor alloying element was added by Azim et al [15] [19].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Oxidation Resistance of Mo–Si–B–Ti Alloys by Pack Cementation

et al. 2017

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“…NBSAs are currently operating at near melting point temperatures [3,[14][15][16]. Further temperature increases would result in the dissolution of the strengthening phase and subsequent melting of the alloy.…”

Section: Introductionmentioning

confidence: 99%

“…Further temperature increases would result in the dissolution of the strengthening phase and subsequent melting of the alloy. Alternatively, new materials with higher melting temperatures, high strengths and good corrosion resistance could be employed to replace NBSAs [14,15]. Fischer et al [17] stated that problems encountered in the aerospace industry could be solved by using Pt-based alloys, because they have proved to do exceptionally well in various high temperature applications, including areas such as glass manufacturing, handling of corrosive substances, etc.…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Corrosion Resistance of Pt-Based Superalloys in 0.2% SO2-N2 Gas

Potgieter¹,

Maledi²

2014

TOMSJ

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Pt-based superalloys are a new generation of materials intended to be used in various high temperature applications. Effluent gases emitted to the environment during combustion operations can lead to degradation of high temperature materials with deleterious effects on mechanical integrity and the corrosion of alloys. This paper focuses on sulphidation of one quaternary, and four ternary, Pt-based superalloys of various chemical compositions. Pt-based superalloys were exposed at 900°C in a reducing environment. The alloys were compared to coated and uncoated Ni-based superalloys (NBSAs). X-Ray diffraction (XRD), Scanning electron microscopy (SEM) and Raman spectroscopy were used to characterize corrosion products that formed. The Pt-based superalloys exhibited higher corrosion resistance than NBSAs as a result of the formation of a protective Al 2 O 3 scale, whereas NBSAs suffered internal sulphidation and formed Cr and Ni sulphide corrosion compounds. The formation of brittle needle-like phases and the transformation of the NiAl phase to Ni 3 Al, led to early failure of the coated alloy. Pt-based superalloys alloyed with Co showed poor corrosion resistance as a result of depletion of alloying elements.

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“…Temperature in these engines can exceed 1650˚C and metal temperature can reach 1200˚C. TBCs insulate the superalloy, thus allowing engines to work at higher temperature with higher efficiency [4][5][6][7][8]. Oxidation of the bond coat is a primary failure mechanism of commercial TBCs and a potential weak link for improving coatings lifetime.…”

Section: Introductionmentioning

confidence: 99%

Zirconium Modified Aluminide Coatings Obtained by the CVD and PVD Methods

Romanowska¹,

Zagula-Yavorska

Sieniawski³

et al. 2013

OJMetal

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The paper presents the comparison of the structures of the zirconium modified aluminide coatings deposited on pure nickel by the CVD and PVD methods. In the CVD process, zirconium was deposited from the ZrCl 3 gas phase at the 1000˚C. Zirconium thin layer (1 or 7 μm thick) and aluminum thin layer (1.0, 0.7 or 0.5 μm thick) were deposited by the EB-PVD method. Deposition velocity was about 1 m/min. The layers obtained by the Electron Beam Evaporation method were subjected to diffusion treatment for 2 h in the argon atmosphere. The obtained coatings were examined by the use of an optical microscope (microstructure and coating thickness) a scanning electron microscope (chemical composition on the cross-section of the modified aluminide coating) and XRD phase analysis. Microstructures and phase compositions of coatings obtained by different methods differ significantly. NiAl(Zr), Ni 3 Al and Ni(Al) phases were found in the CVD aluminide coatings, whereas Ni 5 Zr, Ni 7 Zr 2 and γNi(Al,Zr) were observed in coatings obtained by the PVD method. The results indicate that the microstructure of the coating is strongly influenced by the method of manufacturing.

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Oxidation resistance: One barrier to moving beyond Ni-base superalloys

Cited by 129 publications

References 53 publications

Enhanced Oxidation Resistance of Mo–Si–B–Ti Alloys by Pack Cementation

Enhanced Oxidation Resistance of Mo–Si–B–Ti Alloys by Pack Cementation

High Temperature Corrosion Resistance of Pt-Based Superalloys in 0.2% SO2-N2 Gas

Zirconium Modified Aluminide Coatings Obtained by the CVD and PVD Methods

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