Alumina-based sintered body insulator for spark plugs
US6559579B2 · kind B2 · utility
17Cited by
6References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 29, 2000 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Jul 7, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An insulator for spark plug comprises an alumina-based sintered body comprising: Al2O3 as a main component; and at least one component (hereinafter referred to as “&bgr; component”) selected from the group consisting of Ca component, Sr component and Ba component, wherein the alumina-based sintered body comprises particles comprising a compound comprising the &bgr; component and Al component, the compound having a molar ratio of the Al component to the &bgr; component of 4.5 to 6.7 as calculated in terms of oxides thereof, and has a relative density of 90% or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.