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Influence of substrate hardness and surface roughness on the formation of aerosol deposited films

Title data

Schubert, Michael ; Hahn, Manuel ; Exner, Jörg ; Kita, Jaroslaw ; Moos, Ralf:
Influence of substrate hardness and surface roughness on the formation of aerosol deposited films.
Event: 6th International Congress on Ceramics (ICC6) , 21.-25.08.2016 , Dresden, Deutschland.
(Conference item: Conference , Poster )

Abstract in another language

The Aerosol Deposition Method (ADM) is a novel ceramic coating technique, which allows manufacturing of dense ceramic films at room temperature directly from ceramic powders without any high temperature sintering steps and without expensive vacuum processes. Due to its deposition mechanism based on collision and densification of fine ceramic powder particles on a substrate, it is also called “Room Temperature Impact Consolidation” (RTIC). Ceramic particles are accelerated up to several hundred m/s and ejected on a target. There, they build dense ceramic layers by fraction of the particles into fragments with typical crystallite sizes of about 20 nm and subsequent consolidation. The deposition mechanism can be separated into two stages, the creation of an anchor layer and subsequent film formation. Step one composes an initial plastic deformation of the substrate surface by the first impacting particles. Substrate properties affect the deposition and determine the dominant bonding mechanism, especially in the first stage. Ductile and/or low-melting substrates can be expected to give strong film anchoring whereas high hardness substrates might require higher velocity particles to form adherent layers. In this study, the influence of the substrate hardness in combination with the surface roughness on the deposition was investigated. Four ceramic substrates (two types of Al2O3, Sapphire and LTTC) with different hardness and surface roughness were coated with Al2O3 in order to study the formation of an anchor layer and their effect on the deposition rate. Furthermore, a separate anchor layer formation and film growth was investigated.

Further data

Item Type: Conference item (Poster)
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: 05 Sep 2016 07:50
Last Modified: 05 Sep 2016 07:50