Effects of surface modification on thermal cycling lifetime of thermal barrier coatings with HVOF NiCrAlY bond coat

Liyong Ni; Chungen Zhou

doi:10.1016/j.pnsc.2012.04.007

Effects of surface modification on thermal cycling lifetime of thermal barrier coatings with HVOF NiCrAlY bond coat

Liyong Ni
, Chungen Zhou^*

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University

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

27 Scopus citations

Abstract

NiCrAlY bond coat was prepared by HVOF (high-velocity oxygen fuel) spray on nickel-based superalloy. Surface treatments like grit-blasting, shot-peening and vacuum treatment methods were carried out in order to study the effects of surface modification on thermal cycling lifetime of TBCs. The surface-modified TBCs exhibited better thermal shock resistance. Failure of TBCs with the as-sprayed bond coat occurred within the top coat and at the interface between spinels and the top coat, while that of after shot-peening, grit-blasting and vacuum treatment occurred mainly within the top coat. TGO (thermally grown oxide) formed on as-sprayed bond coat was composed of a Ni(Al,Cr)₂O₄ spinels outer layer and a Al₂O₃ inner layer. But, a continuous and uniform Al₂O₃ formed after surface modification. Formation of the mixed oxides (spinels) on the as-sprayed bond coat accelerated the failure of TBCs.

Original language	English
Pages (from-to)	237-243
Number of pages	7
Journal	Progress in Natural Science: Materials International
Volume	22
Issue number	3
DOIs	https://doi.org/10.1016/j.pnsc.2012.04.007
State	Published - Jun 2012

Keywords

HVOF
NiCrAlY
Thermal barrier coatings
Thermally grown oxide (TGO)

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10.1016/j.pnsc.2012.04.007

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title = "Effects of surface modification on thermal cycling lifetime of thermal barrier coatings with HVOF NiCrAlY bond coat",

abstract = "NiCrAlY bond coat was prepared by HVOF (high-velocity oxygen fuel) spray on nickel-based superalloy. Surface treatments like grit-blasting, shot-peening and vacuum treatment methods were carried out in order to study the effects of surface modification on thermal cycling lifetime of TBCs. The surface-modified TBCs exhibited better thermal shock resistance. Failure of TBCs with the as-sprayed bond coat occurred within the top coat and at the interface between spinels and the top coat, while that of after shot-peening, grit-blasting and vacuum treatment occurred mainly within the top coat. TGO (thermally grown oxide) formed on as-sprayed bond coat was composed of a Ni(Al,Cr)2O4 spinels outer layer and a Al2O3 inner layer. But, a continuous and uniform Al2O3 formed after surface modification. Formation of the mixed oxides (spinels) on the as-sprayed bond coat accelerated the failure of TBCs.",

keywords = "HVOF, NiCrAlY, Thermal barrier coatings, Thermally grown oxide (TGO)",

author = "Liyong Ni and Chungen Zhou",

note = "Publisher Copyright: {\textcopyright} 2012",

year = "2012",

month = jun,

doi = "10.1016/j.pnsc.2012.04.007",

language = "英语",

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AU - Ni, Liyong

AU - Zhou, Chungen

PY - 2012/6

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N2 - NiCrAlY bond coat was prepared by HVOF (high-velocity oxygen fuel) spray on nickel-based superalloy. Surface treatments like grit-blasting, shot-peening and vacuum treatment methods were carried out in order to study the effects of surface modification on thermal cycling lifetime of TBCs. The surface-modified TBCs exhibited better thermal shock resistance. Failure of TBCs with the as-sprayed bond coat occurred within the top coat and at the interface between spinels and the top coat, while that of after shot-peening, grit-blasting and vacuum treatment occurred mainly within the top coat. TGO (thermally grown oxide) formed on as-sprayed bond coat was composed of a Ni(Al,Cr)2O4 spinels outer layer and a Al2O3 inner layer. But, a continuous and uniform Al2O3 formed after surface modification. Formation of the mixed oxides (spinels) on the as-sprayed bond coat accelerated the failure of TBCs.

AB - NiCrAlY bond coat was prepared by HVOF (high-velocity oxygen fuel) spray on nickel-based superalloy. Surface treatments like grit-blasting, shot-peening and vacuum treatment methods were carried out in order to study the effects of surface modification on thermal cycling lifetime of TBCs. The surface-modified TBCs exhibited better thermal shock resistance. Failure of TBCs with the as-sprayed bond coat occurred within the top coat and at the interface between spinels and the top coat, while that of after shot-peening, grit-blasting and vacuum treatment occurred mainly within the top coat. TGO (thermally grown oxide) formed on as-sprayed bond coat was composed of a Ni(Al,Cr)2O4 spinels outer layer and a Al2O3 inner layer. But, a continuous and uniform Al2O3 formed after surface modification. Formation of the mixed oxides (spinels) on the as-sprayed bond coat accelerated the failure of TBCs.

KW - HVOF

KW - NiCrAlY

KW - Thermal barrier coatings

KW - Thermally grown oxide (TGO)

UR - https://www.scopus.com/pages/publications/84901604337

U2 - 10.1016/j.pnsc.2012.04.007

DO - 10.1016/j.pnsc.2012.04.007

M3 - 文章

AN - SCOPUS:84901604337

SN - 1002-0071

VL - 22

SP - 237

EP - 243

JO - Progress in Natural Science: Materials International

JF - Progress in Natural Science: Materials International

IS - 3

ER -

Effects of surface modification on thermal cycling lifetime of thermal barrier coatings with HVOF NiCrAlY bond coat

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Keywords

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