Porosity measurements on heat treated suspension plasma sprayed YSZ coatings using NMR cryoporometry
Paper i proceeding, 2017

Suspension plasma sprayed (SPS) coatings can be produced with fine powder particles and tailor-made porosity. This allows to achieve low thermal conductivity which makes the coatings attractive as e.g. topcoats in thermal barrier coatings (TBCs). Used in gas turbine applications, the TBCs are exposed to high temperatures which leads to alterations of the microstructure. To obtain coatings with optimized properties, possible microstructure alterations like closing of pores and opening of cracks have to be taken into account. Hence, in this study, TBC topcoats consisting of 8 wt.% yttria-stabilized zirconia (YSZ) were heat treated in air at 1150°C and thereafter investigated using scanning electron microscopy, X-ray diffraction, and nuclear magnetic resonance (NMR) cryoporometry. For all investigated samples, the porosity decreased as a result of the heat treatment. The finer pores and cracks disappeared and the larger pores grew slightly and achieved a more distinct shape as the material seemed to become more compact.

YSZ

NMR cryoporometry

porosity

heat treatment

TBC topcoat

suspension plasma spray

Författare

Johanna Ekberg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Uta Klement

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Simone Creci

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Lars Nordstierna

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

International Thermal Spray Conference 2017 Proceedings

Vol. DVS-Berichte Volume 336 308-313

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Annan materialteknik

Styrkeområden

Materialvetenskap

ISBN

978-3-96144-000-9