Manufacturing method for a gas sensing element
AssigneeDenso Corporation
InventorKatsumi Kozaki
Life of this patent
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Abstract
A non-sintered element body having a predetermined shape is fabricated from powdery raw material of a solid electrolytic body. The non-sintered element body is temporarily sintered to obtain a partially-sintered element body as a semi-finished product of the solid electrolytic body. An outer surface of the partially-sintered element body is dipped into a slurry. The slurry contains surface roughing powder including large and small grains which are mutually differentiated in grain size. Then, the partially-sintered element body with a rough slurry film coated thereon is completely sintered into the solid electrolytic body.
Claims10
A method for manufacturing a gas sensing element which has a cup-shaped solid electrolytic body having a reference gas chamber formed therein, an inside electrode provided on an inner surface of said solid electrolytic body, and an outside electrode provided on an outer surface of the solid electrolytic body, said manufacturing method comprising:
- a step of forming a non-sintered element body having a predetermined shape from powdery raw material of said solid electrolytic body;
- a step of temporarily sintering said non-sintered element body to obtain a partially-sintered element body as a semi-finished product of said solid electrolytic body;
- a step of dipping an outer surface of said partially-sintered element body into a slurry, said slurry containing surface roughing powder including large and small grains which are mutually differentiated in grain size;
- and
- a step of completely sintering said partially-sintered element body with a rough slurry film coated thereon into said solid electrolytic body.
Dependencies are inferred from the claim text.