Surface Property Modification of Alumina Sprayed Coatings Using Nd:YAG Laser

Ryoko Moriya; Mabito Iguchi; Shunichi Sasaki; Jiwang Yan

doi:10.1016/j.procir.2016.02.233

Surface Property Modification of Alumina Sprayed Coatings Using Nd:YAG Laser

Ryoko Moriya, Mabito Iguchi, Shunichi Sasaki, Jiwang Yan

Department of Mechanical Engineering

Research output: Contribution to journal › Conference article › peer-review

11 Citations (Scopus)

Abstract

Alumina sprayed coating is an important surface processing technology for mechanical and structural components. However, alumina sprayed coating surfaces are normally very rough and have internal pores. In addition, plasma spraying causes a phase transformation from α-Al₂O₃ to γ-Al₂O₃ which leads to deterioration of corrosion resistance of the coating. In this study, a pulsed Nd:YAG laser was used to improve the surface properties of alumina sprayed coatings. Phase transformation, surface topography and microstructure of the coatings under various laser irradiation conditions were investigated. A reverse phase transformation from γ-Al₂O₃ to α-Al₂O₃ was achieved, and a pore-free surface was generated successfully. Under some laser irradiation conditions, cracks were induced, but they tended to be suppressed by slowing the laser scan speed. Laser-induced material densification was confirmed by cross sectional observation, and the densified region had a columnar microstructure. By increasing energy density or slowing scan speed of the laser, a very thick layer of columnar structure was obtained. The present research demonstrated that the Nd:YAG laser was effective for surface property improvement of alumina sprayed coatings.

Original language	English
Pages (from-to)	464-469
Number of pages	6
Journal	Procedia CIRP
Volume	42
DOIs	https://doi.org/10.1016/j.procir.2016.02.233
Publication status	Published - 2016
Event	18th CIRP Conference on Electro Physical and Chemical Machining, ISEM 2016 - Tokyo, Japan Duration: 2016 Apr 18 → 2016 Apr 22

Keywords

Alumina sprayed coatings
Microstructure
Nd:YAG laser
Phase transformation
Surface property modification

ASJC Scopus subject areas

Control and Systems Engineering
Industrial and Manufacturing Engineering

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10.1016/j.procir.2016.02.233

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title = "Surface Property Modification of Alumina Sprayed Coatings Using Nd:YAG Laser",

abstract = "Alumina sprayed coating is an important surface processing technology for mechanical and structural components. However, alumina sprayed coating surfaces are normally very rough and have internal pores. In addition, plasma spraying causes a phase transformation from α-Al2O3 to γ-Al2O3 which leads to deterioration of corrosion resistance of the coating. In this study, a pulsed Nd:YAG laser was used to improve the surface properties of alumina sprayed coatings. Phase transformation, surface topography and microstructure of the coatings under various laser irradiation conditions were investigated. A reverse phase transformation from γ-Al2O3 to α-Al2O3 was achieved, and a pore-free surface was generated successfully. Under some laser irradiation conditions, cracks were induced, but they tended to be suppressed by slowing the laser scan speed. Laser-induced material densification was confirmed by cross sectional observation, and the densified region had a columnar microstructure. By increasing energy density or slowing scan speed of the laser, a very thick layer of columnar structure was obtained. The present research demonstrated that the Nd:YAG laser was effective for surface property improvement of alumina sprayed coatings.",

keywords = "Alumina sprayed coatings, Microstructure, Nd:YAG laser, Phase transformation, Surface property modification",

author = "Ryoko Moriya and Mabito Iguchi and Shunichi Sasaki and Jiwang Yan",

note = "Publisher Copyright: {\textcopyright} 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.; 18th CIRP Conference on Electro Physical and Chemical Machining, ISEM 2016 ; Conference date: 18-04-2016 Through 22-04-2016",

year = "2016",

doi = "10.1016/j.procir.2016.02.233",

language = "English",

volume = "42",

pages = "464--469",

journal = "Procedia CIRP",

issn = "2212-8271",

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TY - JOUR

T1 - Surface Property Modification of Alumina Sprayed Coatings Using Nd:YAG Laser

AU - Moriya, Ryoko

AU - Iguchi, Mabito

AU - Sasaki, Shunichi

AU - Yan, Jiwang

PY - 2016

Y1 - 2016

N2 - Alumina sprayed coating is an important surface processing technology for mechanical and structural components. However, alumina sprayed coating surfaces are normally very rough and have internal pores. In addition, plasma spraying causes a phase transformation from α-Al2O3 to γ-Al2O3 which leads to deterioration of corrosion resistance of the coating. In this study, a pulsed Nd:YAG laser was used to improve the surface properties of alumina sprayed coatings. Phase transformation, surface topography and microstructure of the coatings under various laser irradiation conditions were investigated. A reverse phase transformation from γ-Al2O3 to α-Al2O3 was achieved, and a pore-free surface was generated successfully. Under some laser irradiation conditions, cracks were induced, but they tended to be suppressed by slowing the laser scan speed. Laser-induced material densification was confirmed by cross sectional observation, and the densified region had a columnar microstructure. By increasing energy density or slowing scan speed of the laser, a very thick layer of columnar structure was obtained. The present research demonstrated that the Nd:YAG laser was effective for surface property improvement of alumina sprayed coatings.

AB - Alumina sprayed coating is an important surface processing technology for mechanical and structural components. However, alumina sprayed coating surfaces are normally very rough and have internal pores. In addition, plasma spraying causes a phase transformation from α-Al2O3 to γ-Al2O3 which leads to deterioration of corrosion resistance of the coating. In this study, a pulsed Nd:YAG laser was used to improve the surface properties of alumina sprayed coatings. Phase transformation, surface topography and microstructure of the coatings under various laser irradiation conditions were investigated. A reverse phase transformation from γ-Al2O3 to α-Al2O3 was achieved, and a pore-free surface was generated successfully. Under some laser irradiation conditions, cracks were induced, but they tended to be suppressed by slowing the laser scan speed. Laser-induced material densification was confirmed by cross sectional observation, and the densified region had a columnar microstructure. By increasing energy density or slowing scan speed of the laser, a very thick layer of columnar structure was obtained. The present research demonstrated that the Nd:YAG laser was effective for surface property improvement of alumina sprayed coatings.

KW - Alumina sprayed coatings

KW - Microstructure

KW - Nd:YAG laser

KW - Phase transformation

KW - Surface property modification

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JO - Procedia CIRP

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T2 - 18th CIRP Conference on Electro Physical and Chemical Machining, ISEM 2016

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ER -

Surface Property Modification of Alumina Sprayed Coatings Using Nd:YAG Laser

Abstract

Keywords

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