Gas sensor element and gas sensor

Patent metadata

Field	Value
Publication number	US-9080964-B2
Application number	US-201213665731-A
Country	US
Kind code	B2
Filing date	Oct 31, 2012
Priority date	Oct 31, 2011
Publication date	Jul 14, 2015
Grant date	Jul 14, 2015

Abstract

A gas sensor element ( 100 ) includes a laminate of a detection element ( 300 ) and a heater ( 200 ), and a porous protection layer ( 20 ) covering a forward end portion thereof. The laminate has a measuring chamber ( 107 c ) into which a gas-to-be-measured is introduced via a diffusion resistor ( 115 ). The porous protection layer includes an inner porous layer ( 21 ), and an outer porous layer ( 23 ). The inner porous layer has a higher porosity than the outer porous layer and the diffusion resistor. As viewed in a plurality of 100 μm×100 μm regions a 1 to a 3 and b 1 to b 3 on sections of the inner porous layer and the diffusion resistor, respectively, a pore diameter greater than the greatest pore diameter C DIF in the regions of the diffusion resistor exists in each of the regions of the inner porous layer.

First claim

What is claimed is:

1. A gas sensor element comprising:
a laminate of a detection element and a heater; and
a porous protection layer which entirely covers a forward end portion of the laminate, wherein
the detection element has at least one cell composed of a solid electrolyte body and a pair of electrodes disposed on the solid electrolyte body;
the heater has an insulating ceramic body and a heat-generating element provided in the insulating ceramic body and adapted to gen…

Assignees

• Ngk Spark Plug Co

Inventors

• Otsuka Sigehiro
• Onkawa Masaki
• Iwano Toru
• Teramoto Satoshi
• Tanaka Kuniharu
• Mitsuoka Takeshi

Classifications

• G01N33/0037

  Physics · mapped topic

• G01N33/0014

  Physics · mapped topic

• G01N27/4077 Primary

  Physics · mapped topic

• Y02A50/20

  Cross-Sectional Technologies · mapped topic