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US 8,012,898 B2Granted
Ceramic with improved high temperature electrical properties for use as a spark plug insulator
AssigneeFederal-Mogul World Wide, Inc.
InventorsWilliam John Walker, Jr., John William Hoffman
Life of this patent
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Abstract
An insulator including alumina in an amount between about 90 and about 99% by weight and an oxide mixture or glass mixture including Boron Oxide, Phosphorus Oxide, or both Boron and Phosphorus Oxide.
Claims17
A ceramic material comprising:
- an alumina in an amount of less than 99.9% by weight of the ceramic material;
- and
- a glass in an amount of up to approximately 12% by weight of the ceramic material and wherein said glass includes at least 1% Phosphorus Oxide by weight of the glass and at least 0.5% Boron Oxide by weight of said glass.
A ceramic, comprising:
- alumina in an amount between about 90 and about 99% by weight;
- a zirconium containing compound in an amount between about 0.01% and about 1% by weight;
- and
- an oxide mixture in an amount between about 1 and about 10% by weight, said oxide mixture including a glass former, a network modifier, Boron Oxide, and Phosphorus Oxide, and wherein the molar ratio of said glass former to said network modifier ranges between about 0.8:1 and 1.2:1.
1 more element
Dependencies are inferred from the claim text.