bei Google ScholarTitelangaben
Exner, Jörg ; Schubert, Michael ; Hanft, Dominik ; Stöcker, Thomas ; Fuierer, Paul ; Moos, Ralf:
Tuning of the electrical conductivity of Sr(Ti,Fe)O₃ oxygen sensing films by aerosol co-deposition with Al₂O₃.
2016
Veranstaltung: 91. DKG Jahrestagung mit Symposium Hochleistungskeramik 2016
, 07.-09.03.2016
, Freiberg, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Poster
)
Abstract
Aerosol deposition (AD) is a very promising coating method to produce dense ceramic films at room temperature on a large variety of substrate materials directly from a ceramic powder. Making composite films by aerosol co-deposition of ceramics (AcDc) gives the opportunity to tune the physical and functional properties. Following previous work, mixtures of iron-substituted strontium titanate (STF) and alumina were prepared and sprayed to composite films. STF is a semiconducting oxygen sensing ceramic with a temperature independent but oxygen partial pressure (pO2) dependent conductivity at temperatures between 700 and 800 °C. By addition of non-conductive alumina in various amounts, composite films of STF35:Al2O3 with homogeneously distributed particle fractions were deposited. The mixing ratio of the powder was basically retained within the sprayed composite film. However, a tendency to improve the deposition of the minority component was observed, leading to a slight change in composition with an enrichment of this minority material in the composite film. Electrical conductivity of AcDc films was easily tunable with up to 60 vol.-% alumina, and the temperature independent oxygen sensing behavior, as observed in bulk ceramics, was retained. Furthermore, the oxygen sensing behavior is comparable to bulk materials matching previously reported slopes for STF35 of d(logσ)/d(pO2) = m(pO2) = 0.2 and the temperature independency remains. The conductivity can be reduced by approximately two decades. It was thus shown that AcDc has the ability to fine tune the electrical conductivity of sensors by creating a robust composite ceramic film with a controlled amount of passive filler. The approach may have additional advantages such as utilizing an inexpensive filler and increasing the wear resistance by incorporating a harder ceramic phase.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Poster) |
|---|---|
| Begutachteter Beitrag: | Ja |
| 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 Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien 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: | 14 Mär 2016 10:01 |
| Letzte Änderung: | 07 Mär 2023 10:07 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/31737 |