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Powder Aerosol Deposition : How to Spray Dense Functional Ceramic Films at Room Temperature without any Sintering

Title data

Exner, Jörg ; Linz, Mario ; Nazarenus, Tobias ; Leupold, Nico ; Kita, Jaroslaw ; Moos, Ralf:
Powder Aerosol Deposition : How to Spray Dense Functional Ceramic Films at Room Temperature without any Sintering.
2020
Event: Electroceramics XVII , 24.-28. August 2020 , Virtual Darmstadt.
(Conference item: Conference , Speech )

Abstract in another language

Powder aerosol deposition (PAD), also referred to as aerosol deposition (AD) or vacuum kinetic spray (VKS), combines several advantages over conventional ceramic coating processes. Due to its unique deposition mechanism (called room temperature impact consolidation, RTIC), film formation occurs completely at room temperature, yet enables to form fully dense ceramic films without any binders nor sintering processes involved. Furthermore, a large variety of coating materials can be processed, onto almost all substrate materials. The mechanical properties of films like the plasma resistance or the hardness are already exceptional in the as-deposited state. These advantages, in particular the ceramic processing directly at room temperature by just spraying a dry ceramic powder, makes the powder aerosol deposition a unique technique to apply all kinds of ceramic films. Typical film thicknesses range from 1 µm up to 200 µm with roughness values below 1 µm. Due to their high quality and density, PAD films are well-suited as either electrical insulation and passivation layer or as functional films with piezoelectric, dielectric or electrical conducting properties. In this work, a broad overview of the PAD method is presented. Special attention is paid to PAD’s operation principle and the necessary deposition mechanism, as well as resulting film morphologies and properties. Based on various ceramic material classes (oxide ion conducting yttria stabilized zirconia and proton conducting barium zirconate for SOFC, lithium ion conducting Li7La3Zr2O12 for solid-state-batteries, and thermoelectric Bi2Te3 for thermoelectric generators), the potential of PAD for the formation of functional ceramic films is demonstrated using the example of already realized applications. We also address how the functional ceramic powders may be conditioned to enhance their usability for PAD.

Further data

Item Type: Conference item (Speech)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 23 Sep 2020 07:51
Last Modified: 23 Sep 2020 07:51
URI: https://eref.uni-bayreuth.de/id/eprint/57374