Spark plug with improved seal

摘要

An electrically conductive glass seal for providing a hermetic bond between an electrically conductive component and an insulator of a spark plug is provided. The glass seal is formed by mixing glass frits, binder, expansion agent, and electrically conductive metal particles. The glass frits can include silica (SiO2), boron oxide (B2O3), aluminum oxide (Al2O3), bismuth oxide (Bi2O3), and zinc oxide (ZnO); the binder can include sodium bentonite or magnesium aluminum silicate, polyethylene glycol (PEG), and dextrin; the expansion agent can include lithium carbonate; and the electrically conductive particles can include copper. The finished glass seal includes the glass in a total amount of 50.0 to 85.0 weight (wt. %), and electrically conductive metal particles in an amount of 15.0 to 50.0 wt. %, based on the total weight of the glass seal.

主权项

1. An electrically conductive glass seal for a spark plug, comprising:
at least one glass in a total amount of 50.0 to 85.0 weight (wt. %), based on the total weight of said glass seal; electrically conductive metal particles in an amount of 15.0 to 50.0 wt. %, based on the total weight of said glass seal; wherein said glass seal includes gas-filled pores in an amount of 25.0 to 75.0 volume percent (vol. %), based on the total volume of said glass seal; and said glass seal is electrical conductive.