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Powder requirements for Aerosol Deposition of alumina films

Title data

Exner, Jörg ; Hahn, Manuel ; Schubert, Michael ; Hanft, Dominik ; Moos, Ralf ; Fuierer, Paul:
Powder requirements for Aerosol Deposition of alumina films.
Event: 90. DKG Jahrestagung / Symposium Hochleistungskeramik 2015 , 15.-19.03.2015 , Bayreuth, Deutschland.
(Conference item: Conference , Other Presentation type)

Abstract in another language

Aerosol deposition (AD), which is also called Room Temperature Impact Consolidation (RTIC), combines several advantages over conventional coating processes. It takes place completely at room temperature, and a large variety of materials can be processed, as coating or substrate material. One major drawback is related to suitability of used raw powders. The success of the deposition is highly dependent on the sprayed powder and its preparation. At the moment, an easy prediction whether a powder forms a good film by AD is not possible. Especially, the deposition of alumina films on hard ceramic substrates proves difficult.

Therefore, a wide experimental study about the suitability of 13 different alumina powders for aerosol deposition on alumina and glass substrates was carried out. Three different powder properties (particle size d50, specific surface area SBET, and compressibility index CI) were measured and correlated with the success of the subsequent deposition. For both substrate materials, well suited powder characteristics could be identified. High hardness substrates like alumina require powders with an increased SBET and smaller particles for aerosol deposition. In contrast, the powder requirements for deposition on amorphous glass substrates with a smaller hardness vary. Here a powder with bigger particles and smaller SBET less than 3.5 m²/g is suitable for AD. Furthermore, the compressibility index CI of powders plays an important role for the long-term stability of AD films. Powders that meet the described requirements form stable and well adhering films by aerosol deposition.

Further data

Item Type: Conference item (Other)
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
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
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: 11 May 2015 09:40
Last Modified: 18 Apr 2016 07:13