Patent Number: 6,254,926

Title: Method of producing oxygen sensor element

Abstract: An oxygen sensor element includes a solid electrolyte having cavities on a surface thereof and an electrode formed on the surface of the solid electrolyte. In a method of producing the oxygen sensor element, a solution containing a noble metal compound for nucleus formation is first applied to an electrode forming portion of the solid electrolyte to form a coating film. Then, the coating film is heat-treated to form a nucleus forming portion where noble metal nuclei are deposited. Subsequently, metal plating is applied to the nucleus forming portion to form a plating film deeply entering the cavities. Thereafter, the plating film is burned to form the electrode deeply entering the cavities.

Inventors: Katafuchi; Toru (Kariya, JP), Kobayashi; Kiyomi (Kuwana, JP), Miwa; Naoto (Tsushima, JP), Sano; Hiromi (Nagoya, JP), Saito; Toshitaka (Toyohashi, JP)

Assignee: Denso Corporation

International Classification: G01N 27/407 (20060101); B05D 005/12 (); G01N 027/407 ()

Expiration Date: 07/03/2018