Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1989-06-07
1991-07-16
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
20415318, 204425, 204426, 264 61, 264 62, 419 1, 419 8, 419 9, 419 10, 419 19, 419 46, 427123, 427124, 427125, 4271263, G01N 27407
Patent
active
050322486
ABSTRACT:
The invention relates to a gas sensor for measuring an air-fuel ratio of an air-fuel mixture of an internal combustion engine and to a method of manufacturing the gas sensor. The sensor of the invention comprises: a solid state electrolyte layer made of an oxygen ion conductive metal oxide; a first electrode of a porous thin film having the catalyst function which was coated on one surface of the solid state electrolyte layer; a second electrode of a porous thin film having the catalyst function which was coated on the other surface of the solid state electrolyte layer; an electrode shielding layer made of a sintered material of ultra fine particulates whose average grain diameter is 1 .mu.m or less which covers the surface other than the region of a predetermined area of the second electrode; and a gas diffusion layer made of a porous electric insulative metal oxide which covers the region of the predetermined area of at least the second electrode.
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Harada Takeshi
Ibaraki Yoshiro
Ichikawa Norio
Kanamaru Masatoshi
Ueno Sadayasu
Hitachi , Ltd.
Tung T.
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