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Oxidation Behaviour of High-Entropy Alloy Coatings Deposited by High Velocity Air-Fuel Spraying
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
2021 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

High-entropy alloys (HEAs) represent a relatively new group of multicomponent alloys that have shown great potential for applications that require tribological and oxidation resistant properties. Consequently, thermally sprayed coatings of different HEA chemistries have also received increasing research attention. In this paper, atomized equimolar CrFeCoNi and AlCrFeCoNi feedstocks were used for high velocity air-fuel spraying to produce overlay coatings using two different nozzle configurations. The microstructure, phase constitution and hardness of the coatings were analysed. The coatings were also tested for their oxidation behaviour and their erosion resistance. The performance of the two HEA chemistries was compared with two commercial MCrAlY coatings that are well-established bond coat materials. Furthermore, an investigation was conducted to test the coatings’ performance as bond coats by applying suspension plasma sprayed yttria stabilized zirconia top coats and evaluating the thermal cycling behaviour of the thermal barrier coatings systems. The AlCrFeCoNi-coating was found to demonstrate a lower oxidation rate than CrFeCoNi. The AlCrFeCoNi chemistry also compared well with the commercial bond coat material that has been optimized after several years of development, although the former was found to form more rapid oxide scales. The HEA coatings also exhibited similar erosion resistance compared to coatings deposited with the commercial MCrAlY material.

Place, publisher, year, edition, pages
2021. , p. 30
Keywords [en]
High-entropy alloys (HEA), High velocity air fuel (HVAF), oxidation, isothermal, thermal barrier coatings (TBC), bond coat, thermal spray.
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:hv:diva-17813Local ID: EXM903OAI: oai:DiVA.org:hv-17813DiVA, id: diva2:1612739
Subject / course
Mechanical engineering
Educational program
Masterprogram i tillverkningsteknik
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Examiners
Available from: 2021-12-06 Created: 2021-11-19 Last updated: 2021-12-06Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
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  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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  • html
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