Abstract: A process of manufacturing an oxygen sensor having an oxygen sensing element which includes an oxygen-ion conductive solid electrolyte body, a plurality of electrodes on the solid electrolyte body, and a porous ceramic protective layer which covers the electrode disposed on the side of a measurement gas, to protect the electrode from direct exposure to the measurement gas. The process comprises a step of heat-treating at least a portion of the ceramic protective layer covering the electrode, in a reducing atmosphere. The heat-treatment improves an operating response of the sensor over the entire range of temperature of the measurement gas.

Abstract: The disclosed apparatus is for drying a ceramic green honeycomb body by dielectric heating, which apparatus comprises a support board disposed between two electrodes for the dielectric heating, the support board having a tray-like metallic first part to support the ceramic green honeycomb body and a plate-like non-metallic second part to hold the first part.