High temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings

H. Chen; M. Fan; W. Zhu; A. D. Norton

doi:10.1016/j.surfcoat.2020.125431

High temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings

H. Chen, M. Fan, W. Zhu, A. D. Norton

Department of Mechanical, Materials and Manufacturing Engineering

Research output: Journal Publication › Article › peer-review

19 Citations (Scopus)

Abstract

This paper investigates the high temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings. Three CoNiCrAlY coatings with different fractions of internal oxides were prepared by varying the standoff distance and the oxygen-to-acetylene ratio. The high temperature oxidation behaviour of the combustion flame sprayed CoNiCrAlY coatings were examined in air at 1100 °C. Microstructural analysis revealed that spinel oxides and alumina scale formed in the CoNiCrAlY coatings which have low content of internal oxide stringers. NiCo-oxides, which exhibit polyhedral morphology, were found in the coating with high content of internal oxide stringers. In addition, it is found that the internal oxidation initiated in the concave regions at the oxide/coating interface and internal nitridation occurred at long exposure conditions.

Original language	English
Article number	125431
Journal	Surface and Coatings Technology
Volume	385
DOIs	https://doi.org/10.1016/j.surfcoat.2020.125431
Publication status	Published - 15 Mar 2020

Keywords

CoNiCrAlY coatings
Combustion flame spray
Internal nitridation
Internal oxidation
Oxide morphology

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.surfcoat.2020.125431

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title = "High temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings",

abstract = "This paper investigates the high temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings. Three CoNiCrAlY coatings with different fractions of internal oxides were prepared by varying the standoff distance and the oxygen-to-acetylene ratio. The high temperature oxidation behaviour of the combustion flame sprayed CoNiCrAlY coatings were examined in air at 1100 °C. Microstructural analysis revealed that spinel oxides and alumina scale formed in the CoNiCrAlY coatings which have low content of internal oxide stringers. NiCo-oxides, which exhibit polyhedral morphology, were found in the coating with high content of internal oxide stringers. In addition, it is found that the internal oxidation initiated in the concave regions at the oxide/coating interface and internal nitridation occurred at long exposure conditions.",

keywords = "CoNiCrAlY coatings, Combustion flame spray, Internal nitridation, Internal oxidation, Oxide morphology",

author = "H. Chen and M. Fan and W. Zhu and Norton, {A. D.}",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

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day = "15",

doi = "10.1016/j.surfcoat.2020.125431",

language = "English",

volume = "385",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

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TY - JOUR

T1 - High temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings

AU - Chen, H.

AU - Fan, M.

AU - Zhu, W.

AU - Norton, A. D.

PY - 2020/3/15

Y1 - 2020/3/15

N2 - This paper investigates the high temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings. Three CoNiCrAlY coatings with different fractions of internal oxides were prepared by varying the standoff distance and the oxygen-to-acetylene ratio. The high temperature oxidation behaviour of the combustion flame sprayed CoNiCrAlY coatings were examined in air at 1100 °C. Microstructural analysis revealed that spinel oxides and alumina scale formed in the CoNiCrAlY coatings which have low content of internal oxide stringers. NiCo-oxides, which exhibit polyhedral morphology, were found in the coating with high content of internal oxide stringers. In addition, it is found that the internal oxidation initiated in the concave regions at the oxide/coating interface and internal nitridation occurred at long exposure conditions.

AB - This paper investigates the high temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings. Three CoNiCrAlY coatings with different fractions of internal oxides were prepared by varying the standoff distance and the oxygen-to-acetylene ratio. The high temperature oxidation behaviour of the combustion flame sprayed CoNiCrAlY coatings were examined in air at 1100 °C. Microstructural analysis revealed that spinel oxides and alumina scale formed in the CoNiCrAlY coatings which have low content of internal oxide stringers. NiCo-oxides, which exhibit polyhedral morphology, were found in the coating with high content of internal oxide stringers. In addition, it is found that the internal oxidation initiated in the concave regions at the oxide/coating interface and internal nitridation occurred at long exposure conditions.

KW - CoNiCrAlY coatings

KW - Combustion flame spray

KW - Internal nitridation

KW - Internal oxidation

KW - Oxide morphology

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U2 - 10.1016/j.surfcoat.2020.125431

DO - 10.1016/j.surfcoat.2020.125431

M3 - Article

AN - SCOPUS:85078916386

SN - 0257-8972

VL - 385

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

M1 - 125431

ER -

High temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings

Abstract

Keywords

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