Spark plug insulator for use in internal combustion engine
AssigneeNgk Spark Plug Co., Ltd.
InventorsMakoto Sugimoto, Masahiro Konishi, Hiroyuki Tanabe, Kenichi Nishikawa
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Abstract
In a spark plug insulator for use in an internal combustion engine, a sintered body has boron nitride and a metal oxide, the boron nitride of the sintered body being 80% or greater by weight, and the sintered body having a thermal expansion coefficient of less than 5.0.times.10-.sup.6 /.degree.C. The metal oxide is selected alone or in combination from the group consisting of magnesium oxide, calcium oxide, silicon oxide, boron oxide, yttrium oxide and aluminum oxide.
Claims2
A spark plug insulator comprising a sintered body including boron nitride and a metal oxide, the boron nitride of the sintered body being at least 80% by weight, and the sintered body having a thermal expansion coefficient of less than 5.0.times.10-.sup.6 /.degree.C.
Dependencies are inferred from the claim text.