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Exner, Jörg ; Hahn, Manuel ; Schubert, Michael ; Hanft, Dominik ; Moos, Ralf ; Fuierer, Paul:
Powder requirements for Aerosol Deposition of alumina films.
2015
Veranstaltung: 90. DKG Jahrestagung / Symposium Hochleistungskeramik 2015
, 15.-19.03.2015
, Bayreuth, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Sonstige
Präsentationstyp)
Abstract
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.
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| Publikationsform: | Veranstaltungsbeitrag (Sonstige) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien Profilfelder > Advanced Fields > Neue Materialien Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT Profilfelder Profilfelder > Advanced Fields Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 11 Mai 2015 09:40 |
| Letzte Änderung: | 18 Apr 2016 07:13 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/13107 |