Oxygen sensor element and process for producing the same.

摘要

A solid electrolyte type oxygen sensor element having a built-in heater characterized by having an insulating layer including a heater therein on an electrode formed side of solid electrolyte plate is improved in adhesiveness when an oxide binder of Al2O3 - SiO2 - MgO system, or Al2O3 - SiO2 system is added to the insulating layer, the solid electrolyte plates or an insulating thin layer formed at an interface of the insulating layer and the solid electrolyte plate. When an intermediate layer is interposed between the insulating layer and the solid electrolyte plate, cracks caused by thermal stress can be prevented effectively.