Al-O-N based duplex coating system for improved oxidation resistance of superalloys and NiCrAlY coatings

S. K. Jha; Y. H. Sohn; S. Sastri; N. Gunda; J. A. Haynes

doi:10.1016/j.surfcoat.2003.09.044

Al-O-N based duplex coating system for improved oxidation resistance of superalloys and NiCrAlY coatings

S. K. Jha
, Y. H. Sohn
, S. Sastri
, N. Gunda
, J. A. Haynes

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Performance of an Al-O-N based duplex coating system (DCS) was examined in order to improve the high-temperature oxidation resistance of superalloys and the low-pressure plasma sprayed NiCrAlY coatings. The DCS (∼5 μm thick) was deposited using pulsed DC reactive magnetron sputtering as an external coating on Rene'N5 superalloy with and without NiCrAlY coating. DCS coatings were characterized using photo-stimulated luminescence spectroscopy, optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy before and after high-temperature oxidation. As-deposited DCS contained varying amounts of α-, γ-Al₂O₃ and amorphous phases depending on the chemistry and surface characteristics of the substrate. Heat treatment at 1121 °C (2050 °F) for 2 h in air facilitated complete phase transformation to equilibrium α-Al₂O₃ in the DCS. Improvement in oxidation resistance was observed for DCS specimens during 250-h oxidation at 1121 °C (2050 °F). In particular, DCS was found to be very effective as an external coating on the rough (as-sprayed) NiCrAlY surface. The superior oxidation resistance of the specimens with DCS may be attributed to the formation of slow-growing and adherent alumina scale and the prevention of Ni/Cr-rich oxide formation.

Original language	English
Pages (from-to)	224-232
Number of pages	9
Journal	Surface and Coatings Technology
Volume	183
Issue number	2-3
DOIs	https://doi.org/10.1016/j.surfcoat.2003.09.044
State	Published - May 24 2004

Keywords

Coatings
Oxidation
Photostimulate luminescence
Residual stress
Thermally grown oxide

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10.1016/j.surfcoat.2003.09.044

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title = "Al-O-N based duplex coating system for improved oxidation resistance of superalloys and NiCrAlY coatings",

abstract = "Performance of an Al-O-N based duplex coating system (DCS) was examined in order to improve the high-temperature oxidation resistance of superalloys and the low-pressure plasma sprayed NiCrAlY coatings. The DCS (∼5 μm thick) was deposited using pulsed DC reactive magnetron sputtering as an external coating on Rene'N5 superalloy with and without NiCrAlY coating. DCS coatings were characterized using photo-stimulated luminescence spectroscopy, optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy before and after high-temperature oxidation. As-deposited DCS contained varying amounts of α-, γ-Al2O3 and amorphous phases depending on the chemistry and surface characteristics of the substrate. Heat treatment at 1121 °C (2050 °F) for 2 h in air facilitated complete phase transformation to equilibrium α-Al2O3 in the DCS. Improvement in oxidation resistance was observed for DCS specimens during 250-h oxidation at 1121 °C (2050 °F). In particular, DCS was found to be very effective as an external coating on the rough (as-sprayed) NiCrAlY surface. The superior oxidation resistance of the specimens with DCS may be attributed to the formation of slow-growing and adherent alumina scale and the prevention of Ni/Cr-rich oxide formation.",

keywords = "Coatings, Oxidation, Photostimulate luminescence, Residual stress, Thermally grown oxide",

author = "Jha, \{S. K.\} and Sohn, \{Y. H.\} and S. Sastri and N. Gunda and Haynes, \{J. A.\}",

year = "2004",

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doi = "10.1016/j.surfcoat.2003.09.044",

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TY - JOUR

T1 - Al-O-N based duplex coating system for improved oxidation resistance of superalloys and NiCrAlY coatings

AU - Jha, S. K.

AU - Sohn, Y. H.

AU - Sastri, S.

AU - Gunda, N.

AU - Haynes, J. A.

PY - 2004/5/24

Y1 - 2004/5/24

N2 - Performance of an Al-O-N based duplex coating system (DCS) was examined in order to improve the high-temperature oxidation resistance of superalloys and the low-pressure plasma sprayed NiCrAlY coatings. The DCS (∼5 μm thick) was deposited using pulsed DC reactive magnetron sputtering as an external coating on Rene'N5 superalloy with and without NiCrAlY coating. DCS coatings were characterized using photo-stimulated luminescence spectroscopy, optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy before and after high-temperature oxidation. As-deposited DCS contained varying amounts of α-, γ-Al2O3 and amorphous phases depending on the chemistry and surface characteristics of the substrate. Heat treatment at 1121 °C (2050 °F) for 2 h in air facilitated complete phase transformation to equilibrium α-Al2O3 in the DCS. Improvement in oxidation resistance was observed for DCS specimens during 250-h oxidation at 1121 °C (2050 °F). In particular, DCS was found to be very effective as an external coating on the rough (as-sprayed) NiCrAlY surface. The superior oxidation resistance of the specimens with DCS may be attributed to the formation of slow-growing and adherent alumina scale and the prevention of Ni/Cr-rich oxide formation.

AB - Performance of an Al-O-N based duplex coating system (DCS) was examined in order to improve the high-temperature oxidation resistance of superalloys and the low-pressure plasma sprayed NiCrAlY coatings. The DCS (∼5 μm thick) was deposited using pulsed DC reactive magnetron sputtering as an external coating on Rene'N5 superalloy with and without NiCrAlY coating. DCS coatings were characterized using photo-stimulated luminescence spectroscopy, optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy before and after high-temperature oxidation. As-deposited DCS contained varying amounts of α-, γ-Al2O3 and amorphous phases depending on the chemistry and surface characteristics of the substrate. Heat treatment at 1121 °C (2050 °F) for 2 h in air facilitated complete phase transformation to equilibrium α-Al2O3 in the DCS. Improvement in oxidation resistance was observed for DCS specimens during 250-h oxidation at 1121 °C (2050 °F). In particular, DCS was found to be very effective as an external coating on the rough (as-sprayed) NiCrAlY surface. The superior oxidation resistance of the specimens with DCS may be attributed to the formation of slow-growing and adherent alumina scale and the prevention of Ni/Cr-rich oxide formation.

KW - Coatings

KW - Oxidation

KW - Photostimulate luminescence

KW - Residual stress

KW - Thermally grown oxide

UR - https://www.scopus.com/pages/publications/2442461052

U2 - 10.1016/j.surfcoat.2003.09.044

DO - 10.1016/j.surfcoat.2003.09.044

M3 - Article

AN - SCOPUS:2442461052

SN - 0257-8972

VL - 183

SP - 224

EP - 232

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 2-3

ER -

Al-O-N based duplex coating system for improved oxidation resistance of superalloys and NiCrAlY coatings

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Keywords

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