Discontinuous Powder Aerosol Deposition Method : Formation of ceramic films at room temperature using small powder quantities

Titelangaben

Linz, Mario ; Kita, Jaroslaw ; Moos, Ralf:
Discontinuous Powder Aerosol Deposition Method : Formation of ceramic films at room temperature using small powder quantities.
2022
Veranstaltung: Ceramics in Europe , 10.-14. July 2022 , Cracow, Poland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )

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Abstract

The Discontinuous Powder Aerosol Deposition (DPAD) allows for the formation of ceramic dense films from ceramic raw powder at room temperature using smallest powder quantities of less than 100 mg. It is a variation of the Powder Aerosol Deposition Method (PAD) where powder quantities with a minimum of several grams are required. Two major differences between DPAD and conventional PAD exist: First, the discontinuous mode of operation allows for the use of smallest powder quantities, as a constant aerosol formation is not necessary anymore. The coating process is more of a “shot-like” type and is completed within seconds. Second, a defined and adjustable gas pressure is used to accelerate the particles through a nozzle in a vacuum chamber. The resulting adjustment of the momentum of the impacting ceramic particles yields two further advantages: First, one may tune the impact velocity for optimum deposition efficiency of the powder-of-interest. Second, changing the momentum of the ceramic particles may reduce a sandblast effect and therefore allows the coating of more sensible (soft) substrate materials. With the small powder quantities, only small areas can be coated. Therefore, we see the potential application in the following fields: Testing of new materials where only small powder quantities can be synthesized and sensor applications where small coating areas are sufficient.