Abstract
Abstract. A manufacturing process for a planar binary lambda sensor is shown. By joining the heating and the sensing components via glass soldering with a joining temperature of 850 °C, a laboratory platform has been established that allows the manufacturing of two independent parts in high-temperature co-fired ceramics technology (HTCC) with electrodes that are post-processed at lower temperatures, as is required for mixed-potential sensors. The final device is compared to a commercial sensor with respect to its sensing performance. Important processes and possible origins of problems as well as their solutions during sensor development are shown, including heater design and joining process.
Highlights
Gas sensors are indispensable parts in modern automotive exhaust gas aftertreatment systems
Schubert et al.: Sintered yttria-stabilized zirconia tial pressures), a voltage below 200 mV in lean conditions, and an almost abrupt transition in between, indicating the stoichiometric point. Such sensors are realized in a planar high-temperature co-fired ceramics technology (HTCC), using yttriastabilized zirconia (YSZ) green tapes as base material (Baunach et al, 2006; Riegel, 2002)
Properties of materials in the model were fitted to the commercial tape system of Electroscience Lab (ESL) that was chosen for fabricating the sensor (ESL, 2015)
Summary
Gas sensors are indispensable parts in modern automotive exhaust gas aftertreatment systems. Schubert et al.: Sintered yttria-stabilized zirconia tial pressures), a voltage below 200 mV in lean conditions, and an almost abrupt transition in between, indicating the stoichiometric point Such sensors are realized in a planar high-temperature co-fired ceramics technology (HTCC), using YSZ green tapes as base material (Baunach et al, 2006; Riegel, 2002). We present a possibility to manufacture a planar switching-type lambda probe made of two separate produced parts, which are joined together by the new process at moderate temperatures of about 850 ◦C. This offers the integration of “low” sintering complex electrode materials inside the sensor element (which can be, e.g., in contact with the reference atmosphere). Both parts are joined together at 850 ◦C
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