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Termisk cykling provuppställning konstruktion och provning av TBCs för dieselmotorapplikation
University West, Department of Engineering Science, Research Enviroment Production Technology West.
2017 (Swedish)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesisAlternative title
Thermal cycling test setup design and testing of TBCs for diesel engine application (English)
Abstract [en]

Thermal barrier coatings (TBCs) thermally insulate the substrate from high temperature exposure. This work attempted to simulate real engine thermal cyclic conditions by designing a test method to evaluate the thermal cyclic fatigue (TCF) performance of different coatings applied inside exhaust manifold of a diesel engine. The coatings investigated in this work comprised of two plasmas-sprayed TBCs (conventional 8YSZ and nanostructured 8YSZ) and one bond coat (NiCoCrAlY). Additionally, these coatings were exposed to isothermal testing and their oxidation behavior was evaluated.   All the coatings along with only substrate were exposed to temperature around 525°C for 150 cycles in thermal cyclic testing carried out on Scania’s heavy-duty diesel engine. For isothermal testing, all coatings along with only substrate material were exposed to 650°C and 750°C for 168 hours respectively. Microstructural analysis by SEM/EDS was carried out to compare the microstructural evolution of the tested coatings with the as sprayed TBCs. In the case of thermal cyclic test, all coatings showed no failure and no TGO growth up to 150 cycles. In the EDS analysis for isothermally tested coatings, oxidation of the substrate at bond coat- substrate interface instead of TGO growth was observed. Bond coat showed lowest oxide layer thickness at 650°C and 750°C followed by conventional YSZ and then nanostructured YSZ. But, conventional YSZ showed microcracks in top coat near top coat- bond coat interface after isothermal testing. Thermal cyclic and isothermal exposure test results showed that bond coated substrate and nanostructured YSZ have the potential to be implemented inside the real manifold.   

Place, publisher, year, edition, pages
2017. , 29 p.
Keyword [en]
Thermal Barrier Coatings, test methods
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:hv:diva-11680Local ID: EXP800OAI: oai:DiVA.org:hv-11680DiVA: diva2:1145482
Subject / course
Mechanical engineering
Educational program
Produktionsteknik
Supervisors
Examiners
Available from: 2017-10-02 Created: 2017-09-29 Last updated: 2017-10-07Bibliographically approved

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fulltext(3068 kB)4 downloads
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Production Engineering, Human Work Science and Ergonomics

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  • apa
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