Spark plug for internal combustion engine

Details Spark plug for internal combustion engine Spark plug for internal combustion engine

1996-06-13

2000-07-25

Patel, Ashok

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313144, H01T 1320

Patent

active

06094000&

ABSTRACT:
To improve the consumption resistance and lifetime, a spark plug for an internal combustion engine comprises: an insulation porcelain having a throughhole; a center electrode held at one end of the throughhole; a housing holding the insulation porcelain; a ground electrode disposed at an front end of the housing and facing the center electrode; a spark gap defined by the center electrode and the ground electrode; and at least one of the center electrode and the ground electrode having a noble metal chip bonded to a discharging spot of an front end thereof, wherein the noble metal chip consisting of an Ir-Rh alloy contains Rh in an amount of from 1 wt % to 60 wt %.

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patent: 5853904 (1998-12-01), Hall et al.
Johnson, Matthey & Co. Limited, High Temperature Behavior of Iridium-Rhodium Alloys, Oxidation Resistance and Compatibility, Apr. 1967, vol. 11, No. 2.

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