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Aerosol Deposition : Dry spray coating of functional ceramic films directly at room temperature

Title data

Exner, Jörg ; Schubert, Michael ; Hanft, Dominik ; Nazarenus, Tobias ; Nieke, Philipp ; Glosse, Philipp ; Leupold, Nico ; Schubert, Michaela ; Kita, Jaroslaw ; Moos, Ralf:
Aerosol Deposition : Dry spray coating of functional ceramic films directly at room temperature.
2019
Event: Solid State Ionics 22 , June 16-21, 2019 , Seoul, Korea.
(Conference item: Conference , Poster )

Abstract in another language

The demand for ceramic coatings, used either as passive protective layers or as active components in sensors, batteries, or fuel cells, has steadily increased in recent years. However, the requirements placed on the functionality of the coatings with regard to good electrical properties and durability have increased simultaneously. Yet, production costs should remain low. A novel room temperature coating method, called Aerosol Deposition (AD), shows the potential to deposit high quality ceramic films and could meet the mentioned requirements, especially for functional films. Aerosol Deposition is a dry spray coating process to build dense ceramic films and combines several unique advantages. For the first time, dense ceramic films can be produced at room temperature without heating neither the coating material nor the substrate. Thus the otherwise necessary high temperature treatment step, which must take place either during or subsequently to the coating procedure (e.g. sintering), can be avoided. In addition, films can be applied directly to almost any substrate material just by spraying a raw ceramic powder. The success and quality of the film formation is highly dependent on the right choice of the used powder. The underlying deposition mechanism of AD, usually described as Room Temperature Impact Consolidation (RTIC), has not yet been fully understood. However, fracturing and plastic deformation of the impacting particles combined with the formation of fresh and therefore active surfaces seems to play an important role for the bonding mechanism. We demonstrate that a large variety of electrical conductive ceramics with different dominating conduction mechanisms (lithium ionic, oxide ionic, protonic, or semiconducting) can be processed to dense thick films by AD. Shown examples are Li7La3Zr2O12, 8YSZ, Ce0.9Gd0.1O2-y, BaCe0.8Y0.2O3-y, BaZr0.8Y0.2O3-y as well as SrTi0.65Fe0.35O3-y. These films feature the intended dense film morphology with superior adhesion to the substrate. While all films in the as-deposited state exhibit a decreased electrical conductivity, a mild thermal annealing far below sintering temperatures enable the recovery of bulk-like conductivity values. The necessary temperature can be easily predicted by a novel model. Furthermore, we address how the functional ceramic powders may be conditioned to enhance their usability for AD. Combining knowledge of a suitable powder preparation with an appropriate film post treatment enables to produce dense functional ceramic films with outstanding electrical
properties.

Further data

Item Type: Conference item (Poster)
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: 03 Jul 2019 09:13
Last Modified: 03 Jul 2019 09:13
URI: https://eref.uni-bayreuth.de/id/eprint/49808