dc.contributor.author |
Nyadongo, ST
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|
dc.contributor.author |
Pityana, Sisa L
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|
dc.contributor.author |
Olakanmi, EO
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|
dc.date.accessioned |
2022-01-24T06:37:16Z |
|
dc.date.available |
2022-01-24T06:37:16Z |
|
dc.date.issued |
2021-07 |
|
dc.identifier.citation |
Nyadongo, S., Pityana, S.L. & Olakanmi, E. 2021. Isothermal oxidation performance of laser cladding assisted with preheat (LCAP) Tribaloy T-800 composite coatings deposited on EN8. <i>Coatings, 11(17).</i> http://hdl.handle.net/10204/12223 |
en_ZA |
dc.identifier.issn |
2079-6412 |
|
dc.identifier.uri |
https://doi.org/10.3390/coatings11070843
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|
dc.identifier.uri |
http://hdl.handle.net/10204/12223
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|
dc.description.abstract |
It is anticipated that laser cladding assisted with preheat (LCAP)-deposited Tribaloy (T-800) composite coatings enhances resistance to structural degradation upon exposure to elevated-temperature oxidation service environments. The oxidation kinetics of LCAP T-800 composite coatings deposited on EN8 substrate and its mechanisms have not been explored in severe conditions that are similar to operational parameters. The isothermal oxidation behaviour of the T-800 composite coating deposited on EN8 via LCAP was studied at 800 °C in air for up to 120 h (5 × 24 h cycles) and contrasted to that of uncoated samples. The mass gain per unit area of the coating was eight times less than that of the uncoated EN8 substrate. The parabolic rate constant (Kp) for EN8 was 6.72 × 10-12 g2·cm-4·s-1, whilst that for the T-800 composite coating was 8.1 × 10-13 g2·cm-4·s-1. This was attributed to a stable chromium oxide (Cr2O3) layer that formed on the coating surface, thereby preventing further oxidation, whilst the iron oxide film that formed on the EN8 substrate allowed the permeation of the oxygen ions into the oxide. The iron oxide (Fe2O3) film that developed on EN8 spalled, as evidenced by the cracking of oxide when the oxidation time was greater than 72 h, whilst the Cr2O3 film maintained its integrity up to 120 h. A parabolic law was observed by the T-800 composite coating, whilst a paralinear law was reported for EN8 at 800 °C up to 120 h. This coating can be used in turbine parts where temperatures are <800 °C. |
en_US |
dc.format |
Fulltext |
en_US |
dc.language.iso |
en |
en_US |
dc.relation.uri |
https://www.mdpi.com/2079-6412/11/7/843 |
en_US |
dc.source |
Coatings, 11(17) |
en_US |
dc.subject |
High-temperature oxidation |
en_US |
dc.subject |
Laser cladding assisted with preheat |
en_US |
dc.subject |
LCAP |
en_US |
dc.subject |
Tribaloy T-800 composite |
en_US |
dc.subject |
EN8 steel |
en_US |
dc.subject |
Coatings |
en_US |
dc.title |
Isothermal oxidation performance of laser cladding assisted with preheat (LCAP) Tribaloy T-800 composite coatings deposited on EN8 |
en_US |
dc.type |
Article |
en_US |
dc.description.pages |
17 |
en_US |
dc.description.note |
Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/ |
en_US |
dc.description.cluster |
Manufacturing |
en_US |
dc.description.impactarea |
Laser Enabled Manufacturing |
en_US |
dc.identifier.apacitation |
Nyadongo, S., Pityana, S. L., & Olakanmi, E. (2021). Isothermal oxidation performance of laser cladding assisted with preheat (LCAP) Tribaloy T-800 composite coatings deposited on EN8. <i>Coatings, 11(17)</i>, http://hdl.handle.net/10204/12223 |
en_ZA |
dc.identifier.chicagocitation |
Nyadongo, ST, Sisa L Pityana, and EO Olakanmi "Isothermal oxidation performance of laser cladding assisted with preheat (LCAP) Tribaloy T-800 composite coatings deposited on EN8." <i>Coatings, 11(17)</i> (2021) http://hdl.handle.net/10204/12223 |
en_ZA |
dc.identifier.vancouvercitation |
Nyadongo S, Pityana SL, Olakanmi E. Isothermal oxidation performance of laser cladding assisted with preheat (LCAP) Tribaloy T-800 composite coatings deposited on EN8. Coatings, 11(17). 2021; http://hdl.handle.net/10204/12223. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Nyadongo, ST
AU - Pityana, Sisa L
AU - Olakanmi, EO
AB - It is anticipated that laser cladding assisted with preheat (LCAP)-deposited Tribaloy (T-800) composite coatings enhances resistance to structural degradation upon exposure to elevated-temperature oxidation service environments. The oxidation kinetics of LCAP T-800 composite coatings deposited on EN8 substrate and its mechanisms have not been explored in severe conditions that are similar to operational parameters. The isothermal oxidation behaviour of the T-800 composite coating deposited on EN8 via LCAP was studied at 800 °C in air for up to 120 h (5 × 24 h cycles) and contrasted to that of uncoated samples. The mass gain per unit area of the coating was eight times less than that of the uncoated EN8 substrate. The parabolic rate constant (Kp) for EN8 was 6.72 × 10-12 g2·cm-4·s-1, whilst that for the T-800 composite coating was 8.1 × 10-13 g2·cm-4·s-1. This was attributed to a stable chromium oxide (Cr2O3) layer that formed on the coating surface, thereby preventing further oxidation, whilst the iron oxide film that formed on the EN8 substrate allowed the permeation of the oxygen ions into the oxide. The iron oxide (Fe2O3) film that developed on EN8 spalled, as evidenced by the cracking of oxide when the oxidation time was greater than 72 h, whilst the Cr2O3 film maintained its integrity up to 120 h. A parabolic law was observed by the T-800 composite coating, whilst a paralinear law was reported for EN8 at 800 °C up to 120 h. This coating can be used in turbine parts where temperatures are <800 °C.
DA - 2021-07
DB - ResearchSpace
DP - CSIR
J1 - Coatings, 11(17)
KW - High-temperature oxidation
KW - Laser cladding assisted with preheat
KW - LCAP
KW - Tribaloy T-800 composite
KW - EN8 steel
KW - Coatings
LK - https://researchspace.csir.co.za
PY - 2021
SM - 2079-6412
T1 - Isothermal oxidation performance of laser cladding assisted with preheat (LCAP) Tribaloy T-800 composite coatings deposited on EN8
TI - Isothermal oxidation performance of laser cladding assisted with preheat (LCAP) Tribaloy T-800 composite coatings deposited on EN8
UR - http://hdl.handle.net/10204/12223
ER -
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en_ZA |
dc.identifier.worklist |
24948 |
en_US |