Gas sensor with protective coating and method of forming same
AssigneeBendix Autolite Corporation
InventorJames Daniel Bode
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Abstract
A solid electrolyte oxygen sensor has a protective coating to protect a catalyst or conductive film thereon, which coating is formed as an inorganic reaction product of an oxide material and an inorganic acid which forms a matrix to bond the oxide material as an adherent coating over the film.
Claims15
In a process for the formation of an electrode element for sensing oxygen, the electrode element comprising a solid electrolyte body for transferring oxygen ions, the body having an inner surface having conductive means thereon and an outer surface having a conductive film thereon, the improvement comprising:
- forming a porous protective coating of an oxide over the film without subjecting the film to sintering temperatures for the coating by mixing at least a portion of the oxide material with an inorganic acid which reacts therewith, depositing the oxide on said outer surface and heating the oxide material including said portion to form an inorganic reaction product matrix to bond discrete oxide material as an adherent coating on the film.
In an electrode element for sensing oxygen, the electrode element comprising a solid electrolyte body for transferring oxygen ions, the body having an inner surface with conductive means thereon and an outer surface having a conductive film thereon with a porous protective coating over said film, the improvement wherein said porous protective coating comprises a reticular structure of discrete particles of an oxide interconnected by a matrix comprising an inorganic reaction product of an inorganic acid and the oxide material.
Dependencies are inferred from the claim text.