Title data
Exner, Jörg ; Hahn, Manuel ; Schubert, Michael ; Hanft, Dominik ; Fuierer, Paul ; Moos, Ralf:
Powder requirements for aerosol deposition of alumina films.
In: Advanced Powder Technology.
Vol. 26
(2015)
Issue 4
.
- pp. 1143-1151.
ISSN 0921-8831
DOI: https://doi.org/10.1016/j.apt.2015.05.016
Project information
Project title: |
Project's official title Project's id No information Mo 1060/20 |
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Project financing: |
Deutsche Forschungsgemeinschaft |
Abstract in another language
Dry powder aerosol deposition (AD) potentially offers several advantages over conventional ceramic coating processes. AD takes place at room temperature, and a variety of materials can be utilized as the substrate. Deposition occurs at a relatively rapid rate, and the product is a dense, nano-crystalline thick film. One limitation for AD is related to the suitability of powders. In addition to the many other process variables, the success of the deposition depends on the starting powder and its preparation, determined by trial and error. In this work, a broad experimental study about the suitability of 14 alumina powders for AD was carried out on two different substrates, alumina and glass. Three powder properties, particle size, d50, specific surface area, SBET, and compressibility index, CI, were measured and associated with the success of the subsequent deposition. For alumina substrates (high hardness), it was found that a relatively high powder specific surface area (5.5–8 m²/g) correlated with good film deposition and adhesion. For glass substrates, initial deposition was obtained with almost all powders; however, problem with long term stability, apparently related to residual strain, was witnessed using many powders. Hi quality, well-adhered, stable AD films in this case were associated with comparatively lower SBET and a compressibility index within a tight range of about 44–47%.
Further data
Item Type: | Article in a journal |
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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 Faculties Faculties > Faculty of Engineering Science > Chair Functional Materials Profile Fields Profile Fields > Advanced Fields Research Institutions Research Institutions > Research Centres |
Result of work at the UBT: | Yes |
DDC Subjects: | 600 Technology, medicine, applied sciences > 620 Engineering |
Date Deposited: | 21 Sep 2015 13:15 |
Last Modified: | 18 Apr 2016 07:13 |
URI: | https://eref.uni-bayreuth.de/id/eprint/19472 |