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Powder requirements for aerosol deposition of alumina films

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

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
No information
Mo 1060/20

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
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 > 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