but.committee	prof. RNDr. Karel Maca, Dr. (předseda) Ing. Martin Černý, Ph.D. (člen) Raul Bermejo (člen) prof. Ing. Ivo Dlouhý, CSc. (člen) doc. Ing. Pavel Hutař, Ph.D. (člen) Ing. Oldřich Ševeček, Ph.D. (člen)	cs
but.defence	Práce byla vypracována na vysoké odborné i formální úrovni a byla vysoce pozitivně hodnocena oběma oponenty. Práce přinesla nové poznatky v oblasti alternativních zdrojů energie, což je v současné době velmi významné společenské téma. Prezentace při obhajobě byla srozumitelná a přehledná. V rámci bohaté diskuse uchazečka zodpověděla všechny dotazy oponentů i členů komise.	cs
but.jazyk	angličtina (English)
but.program	Fyzikální a materiálové inženýrství	cs
but.result	práce byla úspěšně obhájena	cs
dc.contributor.advisor	Chlup, Zdeněk	en
dc.contributor.author	Masini, Alessia	en
dc.contributor.referee	Černý, Martin	en
dc.contributor.referee	Bermejo, Raul	en
dc.date.accessioned	2022-06-12T22:55:16Z
dc.date.available	2022-06-13	cs
dc.date.available	2022-06-12T22:55:16Z
dc.date.created	2019	cs
dc.description.abstract	The present doctoral thesis summarises results of investigation focused on the characterisation of materials involved in Solid Oxide Cell technology. The main topic of investigation was the ceramic cell, also known as MEA. Particular attention was given to the role that bi-material interfaces, co-sintering effects and residual stresses play in the resulting mechanical response. The first main goal was to investigate the effects of the manufacturing process (i.e. layer by layer deposition) on the mechanical response; to enable this investigation, electrode layers were screen-printed one by one on the electrolyte support and experimental tests were performed after every layer deposition. The experimental activity started with the measurement of the elastic characteristics. Both elastic and shear moduli were measured via three different techniques at room and high temperature. Then, uniaxial and biaxial flexural strengths were determined via two loading configurations. The analysis of the elastic and fracture behaviours of the MEA revealed that the addition of layers to the electrolyte has a detrimental effect on the final mechanical response. Elastic characteristics and flexural strength of the electrolyte on the MEA level are sensibly reduced. The reasons behind the weakening effect can be ascribed to the presence and redistribution of residual stresses, changes in the crack initiation site, porosity of layers and pre-cracks formation in the electrode layers. Finally, the coefficients of thermal expansion were evaluated via dilatometry on bulk materials serving as inputs for finite elements analyses supporting experiments and results interpretation. The second most important goal was to assess the influence of operating conditions on the integrity of the MEA. Here interactions of ceramic–metal interfaces within the repetition unit operating at high temperatures and as well at both oxidative and reductive atmospheres were investigated. The elastic and fracture responses of MEA extracted from SOC stacks after several hours of service were analysed. Layer delamination and loss of mechanical strength were observed with increasing operational time. Moreover, SEM observations helped to detect significant microstructural changes of the electrodes (e.g. demixing, coarsening, elemental migration and depletion), which might be responsible for decreased electrochemical performances. All the materials presented in this work are part of SOC stacks produced and commercialised by Sunfire GmbH, which is one of the world leading companies in the field.	en
dc.description.abstract	The present doctoral thesis summarises results of investigation focused on the characterisation of materials involved in Solid Oxide Cell technology. The main topic of investigation was the ceramic cell, also known as MEA. Particular attention was given to the role that bi-material interfaces, co-sintering effects and residual stresses play in the resulting mechanical response. The first main goal was to investigate the effects of the manufacturing process (i.e. layer by layer deposition) on the mechanical response; to enable this investigation, electrode layers were screen-printed one by one on the electrolyte support and experimental tests were performed after every layer deposition. The experimental activity started with the measurement of the elastic characteristics. Both elastic and shear moduli were measured via three different techniques at room and high temperature. Then, uniaxial and biaxial flexural strengths were determined via two loading configurations. The analysis of the elastic and fracture behaviours of the MEA revealed that the addition of layers to the electrolyte has a detrimental effect on the final mechanical response. Elastic characteristics and flexural strength of the electrolyte on the MEA level are sensibly reduced. The reasons behind the weakening effect can be ascribed to the presence and redistribution of residual stresses, changes in the crack initiation site, porosity of layers and pre-cracks formation in the electrode layers. Finally, the coefficients of thermal expansion were evaluated via dilatometry on bulk materials serving as inputs for finite elements analyses supporting experiments and results interpretation. The second most important goal was to assess the influence of operating conditions on the integrity of the MEA. Here interactions of ceramic–metal interfaces within the repetition unit operating at high temperatures and as well at both oxidative and reductive atmospheres were investigated. The elastic and fracture responses of MEA extracted from SOC stacks after several hours of service were analysed. Layer delamination and loss of mechanical strength were observed with increasing operational time. Moreover, SEM observations helped to detect significant microstructural changes of the electrodes (e.g. demixing, coarsening, elemental migration and depletion), which might be responsible for decreased electrochemical performances. All the materials presented in this work are part of SOC stacks produced and commercialised by Sunfire GmbH, which is one of the world leading companies in the field.	cs
dc.description.mark	P	cs
dc.identifier.citation	MASINI, A. The Role of Bi/Material Interface in Integrity of Layered Metal/Ceramic [online]. Brno: Vysoké učení technické v Brně. Fakulta strojního inženýrství. 2019.	cs
dc.identifier.other	113807	cs
dc.identifier.uri	http://hdl.handle.net/11012/180475
dc.language.iso	en	cs
dc.publisher	Vysoké učení technické v Brně. Fakulta strojního inženýrství	cs
dc.rights	Přístup k plnému textu prostřednictvím internetu byl licenční smlouvou omezen na dobu 3 roku/let	cs
dc.subject	Solid Oxide Cells	en
dc.subject	Multi-Layered Ceramics	en
dc.subject	Mechanical Characterisation	en
dc.subject	Elastic Properties	en
dc.subject	Fracture Behaviour	en
dc.subject	Multi-Layered Interfaces	en
dc.subject	Co-Sintering	en
dc.subject	Residual Stresses.	en
dc.subject	Solid Oxide Cells	cs
dc.subject	Multi-Layered Ceramics	cs
dc.subject	Mechanical Characterisation	cs
dc.subject	Elastic Properties	cs
dc.subject	Fracture Behaviour	cs
dc.subject	Multi-Layered Interfaces	cs
dc.subject	Co-Sintering	cs
dc.subject	Residual Stresses.	cs
dc.title	The Role of Bi/Material Interface in Integrity of Layered Metal/Ceramic	en
dc.title.alternative	The Role of Bi/Material Interface in Integrity of Layered Metal/Ceramic	cs
dc.type	Text	cs
dc.type.driver	doctoralThesis	en
dc.type.evskp	dizertační práce	cs
dcterms.dateAccepted	2019-06-13	cs
dcterms.modified	2019-07-09-10:29:09	cs
eprints.affiliatedInstitution.faculty	Fakulta strojního inženýrství	cs
sync.item.dbid	113807	en
sync.item.dbtype	ZP	en
sync.item.insts	2022.06.13 00:55:16	en
sync.item.modts	2022.06.13 00:12:55	en
thesis.discipline	Fyzikální a materiálové inženýrství	cs
thesis.grantor	Vysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav materiálových věd a inženýrství	cs
thesis.level	Doktorský	cs
thesis.name	Ph.D.	cs

The Role of Bi/Material Interface in Integrity of Layered Metal/Ceramic

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