PURPOSE: To enable a catalyst to expose enoughly and to prevent peeling-off of a catalyst layer, by forming a catalyst at one surface of a solid electrolytic substrate through the medium of an adhesive agent layer.
CONSTITUTION: An electrode layer 2' is formed in a given position on a surface of a solid electrolytic substrate 1'. A given part, containing the electrode layer 2", of the substrate 1' is covered to form an inorganic adhesive agent layer 3', and a catalyst layer 4' is securely adhered thereon. The adhesive agent for the adhesive agent layer 3' needs that, when coating, it has adhesion, it is of a porous structure having a gas transmissivity resulting from drying or burning, it has no catalyst poison, and it has a high adhesion to the substrate 1'. A component comprising mainly either aluminum or sodium silicate can be listed as a component to satisfy said requirements. The gas detecting element so constituted is formed such that the active surface of the catalyst is enoughly exposed to a gaseous matter to be detected to be high in detecting sensitivity, and besides, the catalyst layer is firmly adhered, whereby it is also high in mechanical strength.
HARADA MITSUO
TAKIGAWA OSAMU
SHIRATORI MASAYUKI
| JP57200653B | ||||
| JPS5014396A | 1975-02-14 |