Heater and glow plug including the same

Patent metadata

Field	Value
Publication number	US-9491804-B2
Application number	US-201214347163-A
Country	US
Kind code	B2
Filing date	Sep 29, 2012
Priority date	Sep 29, 2011
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

The present invention provides a heater including an insulating base made of ceramic, and an electrically conductive line embedded in the insulating base. The electrically conductive line contains electrically conductive grains and ceramic grains. The average grain size of the ceramic grains in the electrically conductive line is smaller than the average grain size of the ceramic grains in the insulating base.

First claim

What is claimed is:

1. A heater comprising an insulating base made of ceramic, and an electrically conductive line embedded in the insulating base, wherein the electrically conductive line contains electrically conductive grains and ceramic grains, the ceramic grains in the electrically conductive line have a smaller average grain size than the ceramic grains in the insulating base, and the ceramic grains in the electrically conductive line have a smaller average grain size in an inner side than in a surface portion close to the interface with the insulating base.

2. The heater according to claim 1 , wherein the ceramic grains in the electrically conductive line have a smaller average grain size than the electrically conductive grains in the electrically conductive line.

3. The heater according to claim 1 , wherein the electrically conductive line contains Cr with a content in the range of 1×10 −6 % by mass to 1×10 −1 % by mass in terms of oxide.

4. A glow plug comprising the heater as set forth in claim 1 , and a metallic holding member electrically connected to the electrically conductive line and holding the heater.

Assignees

• Kyocera Corp

Inventors

• Okamura Takeshi

Classifications

• H05B2203/027

  Heaters specially adapted for glow plug igniters · CPC title

• F23Q7/00

  Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes (circuits therefor H01T15/00); Electrically-heated glowing plugs · CPC title

• H05B3/12 Primary

  characterised by the composition or nature of the conductive material · CPC title

• H05B3/141 Primary

  Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds · CPC title

• H05B3/18

  the conductor being embedded in an insulating material · CPC title