EBSD Analysis and Assessment of Porosity in Thermal Barrier Coatings Produced by Axial Suspension Plasma Spraying (ASPS)
Paper i proceeding, 2017
Axial suspension plasma spraying (ASPS) is a relatively new, innovative spraying
technique which has produced thermal barrier coatings (TBCs) with attractive properties such as
high durability and low thermal conductivity. Using a suspension, it is possible to spray with finer
powder particles resulting in coatings that have a columnar microstructure and contain a wide range
of pore sizes, both nm- and μm-sized pores. To optimize the thermal properties and to maintain
them during service of the components, it will be important to design TBCs with optimal porosity.
Hence, an important part in the assessment of ASPS coatings is therefore the characterization of the
microstructure and how it is build up, and the determination of porosity. Both aspects are addressed
by performing measurement on splats and ASPS-coating using electron backscatter diffraction
(EBSD) technique and by measuring porosity by Mercury Intrusion Porosimetry (MIP).
Mercury intrusion porosimetry
Thermal barrier coating
Axial suspension plasma spraying