Title:
SPARK PLUG INSULATOR PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/014038
Kind Code:
A1
Abstract:
This method comprises a molding step (A) of molding into an alumina molded body 11 a raw material containing a molding helper and an alumina raw powder having a mean particle diameter of 2 μm to 5 μm, and a sintering step (B) of sintering the alumina molded body 11 into an alumina sintered body 12 to serve as a spark plug insulator 1. In the sintering step (B), the molded body 11 is placed in a continuous furnace 100 having a heating zone Z1 heated at 700°C to 1600°C via heating means 401, oxygen gas is introduced, and the interior of the heating zone Z1 is controlled to be a high oxygen atmosphere in which the oxygen concentration exceeds 20 mol%.
Inventors:
KOEDA KATSUMASA (JP)
ARAKI HIROSHI (JP)
ARAKI HIROSHI (JP)
Application Number:
PCT/JP2016/069828
Publication Date:
January 26, 2017
Filing Date:
July 05, 2016
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
H01T13/20; C01F7/021; C04B35/111; H01T13/38
Foreign References:
| JPH03266386A | 1991-11-27 | |||
| JPS62260766A | 1987-11-13 |
Attorney, Agent or Firm:
TOHDA, Kiyoshi (JP)
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