Influences of annealing and hafnium concentration on the microstructures of sputter deposited β-NiAl coatings on superalloy substrates

Bestor, Michael A; Martens, R. L.; Holler, Robert A.; Weaver, M.L.

doi:10.1016/j.intermet.2010.07.001

Cited by 18 publications

(17 citation statements)

References 58 publications

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“…3 shows representative cross-sectional SEM images of the as-deposited coatings. Similar to our previous study [35], the coatings were found to be adherent to the underlying substrates with columnar zone T microstructures consisting of dense arrays of poorly defined fibrous grains [55]. The coating compositions, as determined via WDS, were found to be close to nominal compositions of the sputtering targets.…”

Section: Resultssupporting

confidence: 83%

“…6b). While the chemistries of these precipitates have not been quantified, they have been found to be Hf-rich and are thus presumed to be HfO 2 [35]. Similar observations have been made by Guo and co-workers [67,68] in their investigations of EB-PVD NiAleHf coatings.…”

Section: Precipitatessupporting

confidence: 66%

“…The potential presence of a-Cr precipitates within the NiAlCrHf coating could not be determined from the XRD results due to the fact that a-Cr and NiAl have nearly identical lattice parameters [46]. TEM results for as-deposited NiAle1Hf coatings have been presented previously [35]. Fig.…”

Section: Resultsmentioning

confidence: 99%

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Influences of chromium and hafnium additions on the microstructures of β-nial coatings on superalloy substrates

2011

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Section: Resultssupporting

confidence: 83%

Section: Precipitatessupporting

confidence: 66%

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Influences of chromium and hafnium additions on the microstructures of β-nial coatings on superalloy substrates

2011

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“…Mo, W and Re according to the EDX results. During high temperature annealing, the chemical composition gap between the coating and substrate provided the primary driving force for coating/substrate inter-diffusion which enhanced the adhesion between the coating and substrate [29]. The white arrows in Fig.…”

Section: Fabrication and Characterization Of The Coatingsmentioning

confidence: 99%

A magnetron sputtered microcrystalline β-NiAl coating for SC superalloys. Part I. Characterization and comparison of isothermal oxidation behavior at 1100°C with a NiCrAlY coating

Hou¹,

Zhu²,

Zhang³

et al. 2015

Applied Surface Science

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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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Influences of annealing and hafnium concentration on the microstructures of sputter deposited β-NiAl coatings on superalloy substrates

Cited by 18 publications

References 58 publications

Influences of chromium and hafnium additions on the microstructures of β-nial coatings on superalloy substrates

Influences of chromium and hafnium additions on the microstructures of β-nial coatings on superalloy substrates

A magnetron sputtered microcrystalline β-NiAl coating for SC superalloys. Part I. Characterization and comparison of isothermal oxidation behavior at 1100°C with a NiCrAlY coating

Zirconium Modified Aluminide Coatings Obtained by the CVD and PVD Methods

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