Method of making a spark plug insulator

Details Method of making a spark plug insulator Method of making a spark plug insulator

1995-05-31

1996-10-15

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

264122, B29C 3900, B29D 3100

Patent

active

055651577

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 exceeding 80% 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 combination from the group consisting of magnesium oxide, calcium oxide, silicon oxide, boron oxide, yttrium oxide and aluminum oxide.

REFERENCES:
patent: 4970095 (1990-11-01), Bolt et al.

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