G. Bertrand, University of Technology Belfort-Montbeliard, Belfort, France; F. L. Toma, Fraunhofer Institute for Material and Beam Technology, Dresden, Germany; R. Rampon, University of Technology Belfort-Montbeliard, Belfort cedex, France; D. Klein, C. Coddet, University of Technology Belfort-Montbeliard, Belfort Cedex, France
The suspension plasma spraying using a liquid (suspension) as material feedstock is a promising technique to elaborate thin and nanostructured coatings. This work deals with the optimisation of the slurries in order to control the design of the coatings morphology (porous or dense). Suspensions were prepared starting from nanosized oxides ceramics, in particular titania and yttria stabilized zirconia (8YSZ) particles. Distilled water, pure methanol and ethanol were used as solvents and appropriate dispersing agents were employed to stabilize the suspensions.
An external injection system that ensures the atomisation and radial injection of the suspension into the Ar-H
2 and Ar-H
2-He plasma under atmospheric conditions was designed. The coatings were characterized by SEM and differences in the microstructure of the deposits were observed.
Efforts were made to understand the relationship between liquid feedstock properties (powder charge, density and viscosity), injection (droplets sizes) and plasma parameters and coatings microstructural characteristics.
The suspension plasma spraying using a liquid (suspension) as material feedstock is a promising technique to elaborate thin and nanostructured coatings. This work deals with the optimisation of the slurries in order to control the design of the coatings morphology (porous or dense).
