Spark plug electrode, method for producing same, spark plug, and method for producing spark plug

摘要

A spark plug includes at least one of a center electrode or a ground electrode that is produced by the steps of: mixing a matrix metal with carbon so that the carbon content of the resultant mixture is adjusted to 80 vol. % or less; subjecting the mixture to powder compacting or sintering, to thereby form a core; placing the core in a cup formed of nickel or a metal containing nickel as a main component; and subjecting the cup to cold working. The thus-produced electrode exhibits favorable thermal conductivity and good heat dissipation, by virtue of the small difference in thermal expansion coefficient between the core and an outer shell. The spark plug including the above electrode exhibits excellent durability.

主权项

1. A spark plug electrode for use as at least one of a center electrode and a ground electrode, the electrode-comprising:
a core formed of a composite material containing a matrix metal and carbon dispersed therein in an amount in a range of 10 vol. % to 80 vol. %; and an outer shell which surrounds at least a portion of the core and which is formed of nickel or a metal containing nickel as a main component.