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High Temperature Insulating Properties of Aerosol Deposited Alumina Films

Title data

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

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Abstract in another language

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.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Additional notes: Poster ICACC-S2-P003-2018
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: 15 Feb 2018 12:53
Last Modified: 15 Feb 2018 12:53