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Synthesis of superconducting MgB2-Films by aerosol deposition method (ADM)

Title data

Weis, Frederik ; Hanft, Dominik ; Glosse, Philipp ; Denneler, Stefan ; Berthold, Thomas ; Oomen, Marijn ; Kauffmann-Weiss, Sandra ; Günther, Elisabeth ; Weiss, Maximilian ; Häßler, Wolfgang ; Holzapfel, Bernhard ; Moos, Ralf:
Synthesis of superconducting MgB2-Films by aerosol deposition method (ADM).
Event: Aerosol Technology 2018 , 18.-20.06.2018 , Bilbao, Spain.
(Conference item: Conference , Speech )

Abstract in another language

Magnesium diboride (MgB2) is a promising superconductor with working temperatures below 39 K. Several techniques are known to prepare MgB2 films, filaments or wires. The powder-in-tube technique is used commercially to produce multifilament conductors from in situ or ex situ prepared MgB2 powders. Physical vapor deposition is appropriate to coat substrates with MgB2 thin film. The Aerosol Deposition Method (ADM) is a spray-coating technique at room temperature used to produce films of brittle materials, mostly ceramics like e.g. Al2O3. Due to its ceramic-like mechanical properties, MgB2 can be deposited with this technique as well. For the ADM, fine powders with a particle size range between 0.1 to 10 μm are used as starting powders. A defined aerosol of these powders and a carrier gas is accelerated into a vacuum chamber and onto a substrate. As soon as the particles collide with the substrate, they crack and a fine-grained film forms. Thus ADM thick films are mostly dense nanocrystalline coatings, where various materials can work as a substrate. In this study MgB2 films were synthesized by the ADM on substrates like glass, Al2O3, and nickel base alloys. A stable aerosol was produced by a modified commercial rotating brush generator for several commercial powders. For process monitoring, the aerosol concentration and particle size distribution of the dispersed powder was measured online by an optical aerosol spectrometer. Adhesive films with a thickness of up to several μm could be produced and showed superconductivity at a transition temperature of about 18 K.Processing parameters and powder treatment strongly affected film thicknesses and the morphology of the as-deposited films. The influence of aerosol parameters like carrier gas type, gas flow and aerosol concentration was evaluated based on the quality of the deposited MgB2 and will be discussed within this presentation.

Further data

Item Type: Conference item (Speech)
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: 10 Jul 2019 06:20
Last Modified: 10 Jul 2019 06:20