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1508 |
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Tuesday, June 03, 2008, Auditorium 2 4:20 PM Junior Session This session will deal with different topics, most promising young talents, both from industry and universities will report shortly about their work. This session is accompanied by a special poster exposition. All visitors of this session are allowed to elect their favorite contribution, the winner will be anounced on the awards banquet |
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Influence of microstructure on thermal and optical properties of suspension plasma sprayed (SPS) and atmospheric plasma sprayed (APS) coatings |
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Alexandra Stuke / Research Centre Juelich, Institute of Energy Research (IEF-1), Germany Holger Kassner* / Forschungszentrum Jülich GmbH/ Institut für Energieforschung , Germany Reiner Carius/ Forschungszentrum Juelich GmbH/ Institut für Energieforschung, Germany Dieter Pitzer/ Forschungszentrum Juelich GmbH/Materialprueflabor, Germany Robert Vaßen/ Forschungszentrum Juelich GmbH/ Institut für Energieforschung, Germany Detlev Stöver/ Forschungszentrum Juelich GmbH/ Institut für Energieforschung, Germany |
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Conventional thermal spray processes as the atmospheric plasma spraying (APS) typically use easily flowable powders in a size range between 10 and 100 µm as feedstock. In contrast the suspension plasma spraying (SPS) makes it possible to process nano sized particles directly. Due to the use of nano materials new microstructures and properties can be generated. One point is the possibility to influence the porosity level, its size range and micro crack densities in a wide band. The microstructural features like the porosity and cracks serve as scattering centres for light and hence lead to changes of optical properties. Furthermore the thermal conductivity is affected by the porosity level. In this work yttria partially stabilized zirconia coatings were produced by the SPS and APS process. The influence of the different microstructures on the thermal conductivity as well as the hemispherical reflectance and transmittance for wavelengths between 0.3 to 2.5 µm has been investigated. Due to the higher porosity and crack level of the SPS coatings the thermal conductivity and hemispherical transmittance was significant reduced. |