Sintered ceramic body for a spark plug insulator and method of s

Details Sintered ceramic body for a spark plug insulator and method of s Sintered ceramic body for a spark plug insulator and method of s

1994-08-04

1997-12-30

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Refractory

501 96, 501 98, C04B 35581, C04B 35584

Patent

active

057029989

ABSTRACT:
In a spark plug insulator having a sintered ceramic body, the ceramic body has silicon nitride (Si.sub.3 N.sub.4), aluminum nitride (AlN) and alumina (Al.sub.2 O.sub.3), the sum of the weight of aluminum nitride (AlN) and alumina (Al.sub.2 O.sub.3) to silicon nitride (Si.sub.3 N.sub.4) is in the range of 0.093.about.1.439. Typically, the additive is represented by the group consisting of yttrium oxide (Y.sub.2 O.sub.3), calcium oxide (CaO), lanthanum oxide (La.sub.2 O.sub.3), magnesia (MgO), cerium oxide (SrO), barium oxide (BaO) and neodymium (Nd.sub.2 O.sub.3). The percentage by weight of the sintering additive ranges from 0.3% to 15.0% of the total weight of the silicon nitride (Si.sub.3 N.sub.4), aluminum nitride (AlN) and alumina (Al.sub.2 O.sub.3).

REFERENCES:
patent: 4845059 (1989-07-01), Kohtoku et al.
patent: 4912305 (1990-03-01), Tatemasu et al.
patent: 5032553 (1991-07-01), Tarry

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