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Lessons learned during the development of a manufacturing process for switching-type lambda sensors as a basis for new exhaust gas sensors


Schubert, Franz ; Wollenhaupt, Stefan ; Kita, Jaroslaw ; Hagen, Gunter ; Moos, Ralf:
Lessons learned during the development of a manufacturing process for switching-type lambda sensors as a basis for new exhaust gas sensors.
Veranstaltung: 90. DKG Jahrestagung / Symposium Hochleistungskeramik 2015 , 15.-19.03.2015 , Bayreuth, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Sonstige Präsentationstyp)


In this contribution, the major steps when developing a self-heated switching-type exhaust gas lambda sensor with a four-wire heater for use in laboratory are shown. The goal of this work was to produce a technological platform, which can serve as a basis for further research on automotive zirconia-based exhaust gas sensors. The four-wire heater gave us the option to independently vary parts of the sensor device. It also increased temperature accuracy. The applied High Temperature Co-fired Ceramic (HTCC) process is very similar to the LTCC-process already established in our lab, though especially the insulating layer for the heater introduced some challenges. This alumina layer had to be doubly screen-printed, as the relatively high viscose alumina insulating paste will not close voids that can occur in the screen-printing process. Whereas the line width in thick-film technology can be easily adjusted to 100 μm or less, screen-printing on the relatively rough alumina is more difficult. Thus the line width had to be increased. Care had to be taken that the distances between conducting paths and edge area of the insulating layers is sufficient to prevent degradation of the conducting path due to printing irregularities. A set of lamination parameters was found, so that lamination occurred despite the imperfections introduced by the heater. Use of a sacrificial tape appeared to be sufficient to ensure dimensional stability of the reference channel. Test in synthetic exhausts demonstrated that the sensor switches around Lambda=1, similar to commercial sensors. This result enables us to go for further steps in the development of new types of exhaust gas sensors.

Weitere Angaben

Publikationsform: Veranstaltungsbeitrag (Sonstige)
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Profilfelder > Advanced Fields
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 11 Mai 2015 09:46
Letzte Änderung: 18 Apr 2016 07:19
URI: https://eref.uni-bayreuth.de/id/eprint/13155