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The Aerosol Deposition Method : Novel Ideas for Functional Films

Title data

Moos, Ralf ; Schubert, Michael ; Nieke, Philipp ; Leupold, Nico ; Kita, Jaroslaw ; Hanft, Dominik ; Nazarenus, Tobias ; Glosse, Philipp ; Exner, Jörg ; Schubert, Michaela:
The Aerosol Deposition Method : Novel Ideas for Functional Films.
2019
Event: PACRIM 13, The 13th Pacific Rim Conference of Ceramic Societies , 27.10.-1.11.2019 , Okinawa, Japan.
(Conference item: Conference , Speech )

Abstract in another language

Manufacturing of high-quality ceramic films has gained in importance in the past decades and will become even more important in the future. The powder Aerosol Deposition (AD) method has received much attention during the last 20 years due to its ability to deposit a large variety of ceramic materials on almost any substrate material. It is the unique feature of this spray coating technique to form dense, nanocrystalline ceramic films directly from ceramic powders without any heat treatment process being needed during deposition. Although the method has been known for a long time, it has only recently developed in such a way that more and more research groups are working in the field. The research and development work of the last years aims in two directions. On the one hand, more and more attempts are being made to understand the process itself, i.e. the influence of the powder properties, of the aerodynamic flow conditions, and of the substrate properties, etc. are being investigated. On the other hand, there are always new fields of application that differ from the classical application fields like protective coatings or piezoelectric applications. This contribution reports on some new application ideas from our lab. One focus of this contribution is the development of a nickel-manganese oxide spinel-based NTCR thermistor component. It can be manufactured using classical AD technology and has the same properties as classically manufactured sintered ceramic parts. However, one can even go further and do not spray the calcined nickelmanganese oxides, but mix and spray the oxidic starting materials and fire them directly on the alumina (Al2O3) substrate together with the electrodes. These aerosol co-deposition based components show the same properties as classically manufactured NTCR thermistors but can be produced at far lower temperatures. Another very interesting material is lunar regolith. It is abundant on the Moon’s surface in powder form. Due to the similarity of the terrestrially used powders and lunar regolith, it may be possible to use AD systems for future in situ resource utilization missions (ISRU) on the Moon as they are planned by several space agencies. To test the feasibility of such an endeavor, the processability of lunar mare simulant EAC-1 by the AD method has been examined. It has been proven that dense and consolidated films with a thickness of several micrometer can be produced within minutes by AD. The deposited films show a higher hardness than the steel substrates. Since on the Moon, naturally available regolith powders are very dry, and since the required process vacuum is naturally available, AD appears to be a promising method to produce dense coatings on future ISRU missions. Nowadays, materials for energy conversion are of great importance. This concerns materials for all-solid state batteries, for high-temperature thermoelectrics or for novel perovskite-based solar cells. All can be deposited by AD. A very novel idea is to spray solar-cell materials by AD. The obtained layers show high structural purity and compactness, thus making them suitable for application in perovskite-based optoelectronic devices. By utilizing the AD method, material synthesis can be decoupled from layer processing. AD, therefore, allows for enhanced and easy control over the fabrication of perovskite-based devices, further paving the way for their commercialization.

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: 11 Nov 2019 13:15
Last Modified: 11 Nov 2019 13:15
URI: https://eref.uni-bayreuth.de/id/eprint/53147