# US 9,437,999 B2 · Method for manufacturing oxygen sensor

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- Number: US 9,437,999 B2
- Document ID: US9437999B2
- Status: Granted
- Kind: B2
- Application number: 14/232,335
- Filed: 2012-07-12
- Published: 2014-05-22
- Granted: 2016-09-06
- Earliest claimed: 2011-08-10
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Masashi Kawai
- Inventors: Masashi Kawai
- Web page: https://patentgrep.com/patent/US9437999B2

## CPC

- H01R 43/16: for manufacturing contact members, e.g. by punching and by bending
- G01N 27/4075: {Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts}
- Y10T 29/49224: with coating
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention provides a method for manufacturing an oxygen sensor that is excellent in responsiveness and can be preferably used for diagnosis of catalyst deterioration. An oxygen sensor 1 equipped with an oxygen sensor element 11 comprising a solid electrolyte 21 and Pt coatings, as a pair of electrodes, on both surfaces of the solid electrolyte 21 is manufactured. The method comprises at least steps of: providing a Pt coating 23 on at least one of the solid electrolyte 21 surfaces exposed to the gas to be tested so as to form closed pores 23a inside the Pt coating 23; and heating either the Pt coating 23 or 24 exposed to gas to be tested in a gas atmosphere with higher oxygen concentration than that of the atmospheric gas.

## Claims

### Claim 1

A method for manufacturing an oxygen sensor equipped with an oxygen sensor element comprising a solid electrolyte and Pt coatings, as a pair of electrodes, on both surfaces thereof,
the method comprising at least steps of:
providing a Pt coating on at least one of the solid electrolyte surfaces exposed to the gas to be tested so as to form closed pores inside the Pt coating; and
heating the Pt coating provided on at least the surface exposed to the gas to be tested in a gas atmosphere with higher oxygen concentration than that of the atmospheric gas, and
wherein the step of coating is carried out via non-electrolytic platinum plating, and the closed pores are provided inside the Pt coating by bubbling non-oxidizing gas through a plating solution when conducting non-electrolytic platinum plating.

### Claim 2 (depends on 1)

The method for manufacturing an oxygen sensor according to claim 1, wherein the step of heating is carried out at 1,000 degrees C. to 1,300 degrees C. for at least 1 hour.