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High Velocity Air-Fuel Spraying of Oxide Dispersion Strengthened Bondcoats for Thermal Barrier applications
University West, Department of Engineering Science.
2025 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The present study investigated the use of High Velocity Air-Fuel (HVAF) spraying to pro-duce oxide dispersion strengthened (ODS) bond coats for thermal barrier coatings. The development of nine coatings was achieved through the utilisation of two base powders (Amdry 386 and Metco 2253) and varying alumina contents ranging from 3 to 50 wt.%, employing hybrid and blended spraying techniques. The characterisation of the coatings was conducted through the use of scanning electron microscopy and image analysis techniques. Further-more, a series of tests were performed on the coatings to assess their response to isothermal oxidation and thermal cycling fatigue. The findings demonstrated that the utilisation of blended powders resulted in higher oxide content and more uniform distribution when compared with the use of hybrid spraying techniques. Alumina particles have been found to be preferentially embedded around splat boundaries, thereby enhancing both mechanical inter-locking and oxidation resistance. The performance of coatings based on the Amdry 386 pro-cess was found to exceed that of those based on the Metco 2253A process. The latter was found to be susceptible to Si-rich phase formation. Overall, coatings with higher alumina content demonstrated enhanced durability and a reduced propensity for the formation of deleterious mixed oxides within the thermally grown oxide layer. The findings confirm HVAF as a promising method for producing high-performance ODS bond coats. However, further research is required to optimise the spraying parameters and oxide incorporation.

Place, publisher, year, edition, pages
2025. , p. 50
Keywords [sv]
Hybrid spraying, Thermal barrier coating, Bond coat, Oxide Dispersion Strength-ened, Lifespan
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:hv:diva-23702Local ID: EXM903OAI: oai:DiVA.org:hv-23702DiVA, id: diva2:1979544
Subject / course
Mechanical engineering
Educational program
Maskiningenjör
Supervisors
Examiners
Available from: 2025-07-22 Created: 2025-06-30 Last updated: 2025-09-30Bibliographically approved

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