Alumina-based ceramic composition and spark plug using the same
AssigneesNippon Soken, Inc., Denso Corporation
InventorsItsuhei Ogata, Hirofumi Suzuki, Yasuki Aoi
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Abstract
An alumina-based ceramic composition comprising a composite sintered body of alumina as a main component and a composition of at least one element selected from Al, Si, Mg and rare earth elements, wherein an amount of the composition of at least one element selected from Al, Si, Mg and the rare earth elements is not greater than 5 parts by weight on the basis of 100 parts by weight of alumina as the main component, and a spark plug using this alumina-based ceramic composition for an insulator.
Claims12
1-12. (canceled)
An Alumina-based ceramic composition containing alumina as a main component, comprising a composite sintered body of alumina as said main component and a composition of at least one element selected form A1, Si, Mg and rare earth elements, wherein:
- said composite sintered body is formed in the form of encompassing alumina as said main component with the composition of at least one element selected from A1, Si, Mg and rare earth elements, and
- an amount of said composition of at least one element selected form A1, Si, Mg and the rare earth elements is not greater than 5 parts by weight on the basis of 100 parts by weight of alumina as said main component.
An alumina-based ceramic composition containing alumina as a main component, comprising a composite sintered body of alumina as said main component and a composition of at least one element selected form A1 and Y, wherein:
- said composite sintered body is formed in the form of encompassing alumina as said main component with the composition of at least one element selected from A1, Si, Mg and rare earth elements, and
- an amount of said composition of at least one element selected from A1 and Y is not greater than 5 parts by weight on the basis of 100 parts by weight of alumina as said main component.
An alumina-based ceramic composition containing alumina as a main component, comprising a composite sintered body of alumina as said main component and a perovskite type oxide ReA1O3 as a composite oxide of a rare earth element Re and A1, wherein:
- said composite sintered body is formed in the form of encompassing alumina as said main component with the perovskite type oxide ReA1O3 as a composite oxide of a rare earth element Re and A1, and
- an amount of said perovskit type oxide ReA1O3 is not greater than 5 parts by weight on the basis of 100 parts by weight of alumina as said main component.
Dependencies are inferred from the claim text.