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Thermal barrier coatings for diesel engine exhaust applications
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2014 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Termiska barriärsskikt för grenrörsapplikationer (Swedish)
Abstract [en]

The strive to increase the engine efficiency in terms of fuel consumption and lower emissions

have lead to higher demands on materials. In this thesis five different thermal barrier coatings

applied using air plasma spraying to three materials commonly used for exhaust application

are evaluated. This thesis work was done at Scania CV in Södertälje with main focus on

evaluation during thermal cycling. The goal of this thesis is to evaluate the coatings and

correlate their behaviour to their characteristic microstructure.

The coatings were evaluated through their stability in thermal conductivity, fracture

toughness, hardness, porosity and failure modes. The parameters where obtained using laser

flash, Vickers indentation, Vickers indentation fracture toughness and microscopic evaluation

methods.

The evaluation shows that conventionally used zirconia based materials exhibits low thermal

conductivity, high hardness, and stable fracture toughness compared to other evaluated

materials. One material that can be applicable in diesel exhaust application is mullite, which

showed similar performance to zirconia based materials. For the use of TBC together with

SiMo51 a different bondcoat than conventional NiCrAlY needs to be evaluated.

Abstract [sv]

Strävan efter att konstruera effektivare motorer för att generera minskade utsläpp och bättre

bränsleekonomi har genererat högre krav på konstruktionsmaterialen som används idag. I

detta examensarbete som utförts på Scania CV i Södertälje utvärderas fem olika termiska

barriärsskikt som belagts med plasma sprayning på tre vanligt förekommande

konstruktionsmaterial för grenrör. Målet med detta examensarbete är att utvärdera

beläggningarnas beteende under termisk cykling och koppla deras beteende till karakteristiska

mikrostrukturer.

Beläggningarna utvärderades genom att jämföra deras värmeledningsförmåga, hårdhet,

brottseghet och porositet. Materialparametrarna utvärderades genom laser flash, Vickers

hårdhetsmätning, Vickers brottseghet samt mikroskopiska bildanalyser.

Resultaten visar att kommersiellt använda zirkonium baserade material uppvisar låg

värmeledningsförmåga, hög hårdhet och hög brottseghet i förhållande till övriga material. Ett

annat material som analyserats, mullit, visar på liknande beteenden som zirkonium baserade

material men behöver utvärderas ytterligare. Om SiMo51 används som substratmaterial finns

behovet att utvärdera användningen av andra typer av bindskikt än det austenitiska NiCrAlY

nu använt.

Place, publisher, year, edition, pages
2014. , 73 p.
Keyword [en]
TBC, thermal barrier coatings, APS, mullite, YSZ
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-33264OAI: oai:DiVA.org:kau-33264DiVA: diva2:734499
External cooperation
Scania
Subject / course
Materials Engineering
Educational program
Engineering: Mechanical Engineering, spec. in Materials Engineering (300 ECTS credits)
Supervisors
Examiners
Available from: 2014-08-19 Created: 2014-07-17 Last updated: 2014-08-19Bibliographically approved

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