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

1993-03-15

1994-12-06

Bell, Mark L.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 65, 264 66, 501 98, C04B 3564

Patent

active

053708326

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 weight ratio of aluminum nitride (AlN) and alumina (Al.sub.2 O.sub.3) to silicon nitride (Si.sub.3 N.sub.4) being in the range of 0.093 to 1.439; and at least one sintering additive is among the group consisting of yttrium oxide (Y.sub.2).sub.3), calcium oxide (CaO), lanthanum oxide (La.sub.2 O.sub.3), magnesia (MgO), cerium oxide (CeO.sub.2), scandium oxide (Sc.sub.2 O.sub.3), strontium oxide (SrO), barium oxide (BaO) and neodymium (Nd.sub.2 O.sub.3). The weight percentage 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 (1989-09-01), Kohtoku et al.
patent: 4912305 (1990-03-01), Tatemasu et al.
"Intro to the Principles of Ceramic Processing" J. S. Reed 1988 Wilay & Sons N.Y.

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