Laser remelting treatment of plasma sprayed ZrO2-NiCoCrAlY graded coating

X. Xiang; Z. Yin; J. Zhu; C. Chi

Laser remelting treatment of plasma sprayed ZrO₂-NiCoCrAlY graded coating

X. Xiang^*
, Z. Yin
, J. Zhu
, C. Chi

^*Corresponding author for this work

South China University of Technology

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

1 Scopus citations

Abstract

The laser remelting treatment of plasma sprayed ZrO₂-NiCoCrAlY graded coating on TC4(Ti-6Al-4V) alloy substrate was investigated. In order to maintain the gradual composition distribution, the laser remelted zone was controlled in ZrO₂ top layer. Laser remelting treatment diminished the pores in the ZrO₂ top layer and resulted in a dense microstructure. Compared with the unmelted coating, the ZrO₂ melted zone had a higher micro-hardness and a more excellent oxidation resistance. However, owing to the graded coating being heated and cooled unevenly by the laser beam, a serious residual thermal stress was produced in the coating. Laser remelting distorted the ZrO₂ grains, some coarse cracks were formed in the coating, and the adherence strength between ZrO₂ top layer and graded layers was weakened. As a result, the thermal shock property of the graded coating was worsen.

Original language	English
Pages (from-to)	173-178
Number of pages	6
Journal	Journal of the Chinese Society of Corrosion and Protection
Volume	19
Issue number	3
State	Published - 1999
Externally published	Yes

Keywords

Anti-oxidant property
Laser treatment
Plasma sprayed coating

Cite this

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title = "Laser remelting treatment of plasma sprayed ZrO2-NiCoCrAlY graded coating",

abstract = "The laser remelting treatment of plasma sprayed ZrO2-NiCoCrAlY graded coating on TC4(Ti-6Al-4V) alloy substrate was investigated. In order to maintain the gradual composition distribution, the laser remelted zone was controlled in ZrO2 top layer. Laser remelting treatment diminished the pores in the ZrO2 top layer and resulted in a dense microstructure. Compared with the unmelted coating, the ZrO2 melted zone had a higher micro-hardness and a more excellent oxidation resistance. However, owing to the graded coating being heated and cooled unevenly by the laser beam, a serious residual thermal stress was produced in the coating. Laser remelting distorted the ZrO2 grains, some coarse cracks were formed in the coating, and the adherence strength between ZrO2 top layer and graded layers was weakened. As a result, the thermal shock property of the graded coating was worsen.",

keywords = "Anti-oxidant property, Laser treatment, Plasma sprayed coating",

author = "X. Xiang and Z. Yin and J. Zhu and C. Chi",

year = "1999",

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TY - JOUR

T1 - Laser remelting treatment of plasma sprayed ZrO2-NiCoCrAlY graded coating

AU - Xiang, X.

AU - Yin, Z.

AU - Zhu, J.

AU - Chi, C.

PY - 1999

Y1 - 1999

N2 - The laser remelting treatment of plasma sprayed ZrO2-NiCoCrAlY graded coating on TC4(Ti-6Al-4V) alloy substrate was investigated. In order to maintain the gradual composition distribution, the laser remelted zone was controlled in ZrO2 top layer. Laser remelting treatment diminished the pores in the ZrO2 top layer and resulted in a dense microstructure. Compared with the unmelted coating, the ZrO2 melted zone had a higher micro-hardness and a more excellent oxidation resistance. However, owing to the graded coating being heated and cooled unevenly by the laser beam, a serious residual thermal stress was produced in the coating. Laser remelting distorted the ZrO2 grains, some coarse cracks were formed in the coating, and the adherence strength between ZrO2 top layer and graded layers was weakened. As a result, the thermal shock property of the graded coating was worsen.

AB - The laser remelting treatment of plasma sprayed ZrO2-NiCoCrAlY graded coating on TC4(Ti-6Al-4V) alloy substrate was investigated. In order to maintain the gradual composition distribution, the laser remelted zone was controlled in ZrO2 top layer. Laser remelting treatment diminished the pores in the ZrO2 top layer and resulted in a dense microstructure. Compared with the unmelted coating, the ZrO2 melted zone had a higher micro-hardness and a more excellent oxidation resistance. However, owing to the graded coating being heated and cooled unevenly by the laser beam, a serious residual thermal stress was produced in the coating. Laser remelting distorted the ZrO2 grains, some coarse cracks were formed in the coating, and the adherence strength between ZrO2 top layer and graded layers was weakened. As a result, the thermal shock property of the graded coating was worsen.

KW - Anti-oxidant property

KW - Laser treatment

KW - Plasma sprayed coating

UR - https://www.scopus.com/pages/publications/0032869199

M3 - 文章

AN - SCOPUS:0032869199

SN - 1005-4537

VL - 19

SP - 173

EP - 178

JO - Journal of the Chinese Society of Corrosion and Protection

JF - Journal of the Chinese Society of Corrosion and Protection

IS - 3

ER -

Laser remelting treatment of plasma sprayed ZrO₂-NiCoCrAlY graded coating

Abstract

Keywords

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