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High Temperature Insulating Properties of Aerosol Deposited Alumina Films


Schubert, Michael ; Leupold, Nico ; Kita, Jaroslaw ; Moos, Ralf:
High Temperature Insulating Properties of Aerosol Deposited Alumina Films.
Veranstaltung: 42nd International Conference and Expo on Advanced Ceramics and Composites : ICACC18 , 21.-26.01.2018 , Daytona Beach, Fla., USA.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )


Due to its very low electrical conductivity, alumina is a widely used material for high insulating films. As alumina is typically sintered above 1200 °C, low melting substrates like polymers or low-melting metals are excluded for applications. The Aerosol Deposition Method (ADM) is a novel ceramic coating technique. It allows manufacturing of dense ceramic films at room tempera-ture directly from ceramic powders without any high temperature sintering steps. Thereby, it is possible to produce high insulating alumina films on nearly all types of substrates. As known from liter-ature, the functional properties of aerosol deposited films directly after deposition are not completely identical with bulk samples. Nevertheless, annealing at temperatures around 500 °C can improve these properties. Therefore, it is necessary to know the electrical resistivity of aerosol deposited alumina films after deposition and after annealing. In this study, alumina films were deposited by ADM on a three-electrode setup with guard ring and the electrical conductivity was measured between 400 °C and 900 °C by direct current measurements according to ASTM D257 or IEC 60093. The measured conductivities correlate well with literature values and can be improved by annealing at 900 °C. The processed films show an even higher resistivity than conventional alumina substrates.

Weitere Angaben

Publikationsform: Veranstaltungsbeitrag (Poster)
Begutachteter Beitrag: Ja
Zusätzliche Informationen: Poster ICACC-S2-P003-2018
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder > Advanced Fields
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 15 Feb 2018 12:53
Letzte Änderung: 15 Feb 2018 12:53
URI: https://eref.uni-bayreuth.de/id/eprint/42294