Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques
In this paper, two coating techniques, the high velocity oxy-fuel (HVOF) and air plasma spray (APS) techniques, were used to deposit a bond coat of NiCoCrAlYTa on the Inconel 625 substrate, followed by applying a topcoat of yttria-stabilized zirconia (YSZ). The samples were preoxidized in an argon-c...
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Elsevier Ltd
2020
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| _version_ | 1796865452389957632 |
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| author | Mohd. Zulkifli, I. S. Mat Yajid, M. A. Idris, M. H. Uday, M. B. Daroonparvar, M. Emadzadeh, A. Arshad, A. |
| author_facet | Mohd. Zulkifli, I. S. Mat Yajid, M. A. Idris, M. H. Uday, M. B. Daroonparvar, M. Emadzadeh, A. Arshad, A. |
| author_sort | Mohd. Zulkifli, I. S. |
| collection | ePrints |
| description | In this paper, two coating techniques, the high velocity oxy-fuel (HVOF) and air plasma spray (APS) techniques, were used to deposit a bond coat of NiCoCrAlYTa on the Inconel 625 substrate, followed by applying a topcoat of yttria-stabilized zirconia (YSZ). The samples were preoxidized in an argon-controlled furnace at a temperature of 1000 °C for 12 and 24 h to characterize the microstructure of a thermally grown oxide (TGO) using the two coating techniques. The most suitable preoxidized samples were further tested for isothermal oxidation at 1000 °C for up to 120 h, and a hot corrosion test was performed at 1000 °C for up to 52 h or until spalling occurred. As-sprayed and oxidized samples prepared with different coating techniques were evaluated in terms of their microstructure using different characterization methods, such as field emission scanning electron microscopy (FESEM), variable pressure scanning electron microscopy (VPSEM), energy dispersive X-ray spectroscopy (EDS) equipped with energy dispersive X-ray and X-ray diffraction (XRD) analyses. In addition, the mechanical properties of these samples were evaluated using adhesion tests. The results show that the YSZ/NiCoCrAlYTa coating applied with the HVOF technique forms a more thin and continuous layer of TGO than that obtained when applying a YSZ/NiCoCrAlYTa coating using the APS technique, indicating that a severe brittle oxidation interface exists between the two layers. The results also indicate that the mechanical strength obtained from the adhesion test of the coated samples is observably affected by the oxidation behaviors obtained with the different deposition techniques chosen. |
| first_indexed | 2024-03-05T20:57:13Z |
| format | Article |
| id | utm.eprints-92579 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T20:57:13Z |
| publishDate | 2020 |
| publisher | Elsevier Ltd |
| record_format | dspace |
| spelling | utm.eprints-925792021-09-30T15:15:11Z http://eprints.utm.my/92579/ Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques Mohd. Zulkifli, I. S. Mat Yajid, M. A. Idris, M. H. Uday, M. B. Daroonparvar, M. Emadzadeh, A. Arshad, A. TJ Mechanical engineering and machinery In this paper, two coating techniques, the high velocity oxy-fuel (HVOF) and air plasma spray (APS) techniques, were used to deposit a bond coat of NiCoCrAlYTa on the Inconel 625 substrate, followed by applying a topcoat of yttria-stabilized zirconia (YSZ). The samples were preoxidized in an argon-controlled furnace at a temperature of 1000 °C for 12 and 24 h to characterize the microstructure of a thermally grown oxide (TGO) using the two coating techniques. The most suitable preoxidized samples were further tested for isothermal oxidation at 1000 °C for up to 120 h, and a hot corrosion test was performed at 1000 °C for up to 52 h or until spalling occurred. As-sprayed and oxidized samples prepared with different coating techniques were evaluated in terms of their microstructure using different characterization methods, such as field emission scanning electron microscopy (FESEM), variable pressure scanning electron microscopy (VPSEM), energy dispersive X-ray spectroscopy (EDS) equipped with energy dispersive X-ray and X-ray diffraction (XRD) analyses. In addition, the mechanical properties of these samples were evaluated using adhesion tests. The results show that the YSZ/NiCoCrAlYTa coating applied with the HVOF technique forms a more thin and continuous layer of TGO than that obtained when applying a YSZ/NiCoCrAlYTa coating using the APS technique, indicating that a severe brittle oxidation interface exists between the two layers. The results also indicate that the mechanical strength obtained from the adhesion test of the coated samples is observably affected by the oxidation behaviors obtained with the different deposition techniques chosen. Elsevier Ltd 2020-10-01 Article PeerReviewed Mohd. Zulkifli, I. S. and Mat Yajid, M. A. and Idris, M. H. and Uday, M. B. and Daroonparvar, M. and Emadzadeh, A. and Arshad, A. (2020) Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques. Ceramics International, 46 (14). pp. 22438-22451. ISSN 0272-8842 http://dx.doi.org/10.1016/j.ceramint.2020.06.001 DOI:10.1016/j.ceramint.2020.06.001 |
| spellingShingle | TJ Mechanical engineering and machinery Mohd. Zulkifli, I. S. Mat Yajid, M. A. Idris, M. H. Uday, M. B. Daroonparvar, M. Emadzadeh, A. Arshad, A. Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques |
| title | Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques |
| title_full | Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques |
| title_fullStr | Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques |
| title_full_unstemmed | Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques |
| title_short | Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques |
| title_sort | microstructural evaluation and thermal oxidation behaviors of ysz nicocralyta coatings deposited by different thermal techniques |
| topic | TJ Mechanical engineering and machinery |
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