Room temperature aerosol deposition (AD) for dense ceramic coatings : overview of a novel process

Titelangaben

Hanft, Dominik ; Schubert, Michael ; Exner, Jörg ; Moos, Ralf ; Fuierer, Paul:
Room temperature aerosol deposition (AD) for dense ceramic coatings : overview of a novel process.
2015
Veranstaltung: 90. DKG Jahrestagung / Symposium Hochleistungskeramik 2015 , 15.-19.03.2015 , Bayreuth, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )

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Abstract

The aerosol deposition is a novel coating process to obtain dense ceramic coatings at high deposition rates (μm/min) directly from a dried powder without any intermediate step. Since AD works at room temperature, it has the advantage of making ceramic coating technology accessible to a broad spectrum of temperature sensitive substrate materials and applications. In principle, the aerosol is created by passing a carrier gas in a ceramic bulk powder. Driven by a pressure difference to a vacuum deposition chamber (evacuated to a rough vacuum by a rotary pump) the aerosol is accelerated by a slit nozzle to a velocity of several hundred m/s. This aerosol jet ejects into the deposition chamber where the particles impact on a movable substrate and break into nm-size fragments that are compacted by subsequently impacting particles (room temperature impact consolidation). Plane and homogeneous coatings can be achieved that way. The materials properties of coatings produced thereby are comparable to the ones of the bulk powder. Numerous different materials such as Al2O3, TiO2 PZT, YSZ, SrTi0.7Fe0.3O3−δ, etc. have been successfully deposited with our device and analyzed afterwards.

In this contribution, we give an overview on the general principle of AD and discuss crucial parameters and steps such as raw powder and aerosol generation. The key facts of our work are research on the fundamentals for successful deposition behavior, the mechanical and functional properties of coatings and last but not least their application.