SPARK PLUG HAVING AN INSULATOR COMPOSED OF HIGH-PURITY ALUMINIUM OXIDE CERAMIC
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United States of America Patent
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Issued Date -
Jan 14, 2010
app pub date -
Dec 13, 2007
filing date -
Dec 20, 2006
priority date (Note) -
Abandoned
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Abstract
A spark plug is described for Otto-cycle engines having a metallic spark plug body, having a center electrode, having a ceramic insulator, which is arranged between the center electrode and the body and is based on aluminium oxide, and having at least one earth electrode. The invention provides for the insulator to be composed of 0.01% by weight to 1% by weight of magnesium oxide, at most 0.3% by weight of natural and/or impurities, with the rest being aluminium oxide, and being formed by solid-phase sintering so that it is very largely free of glass phases.
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