Spark plug electrode tip for internal combustion engine

Details Spark plug electrode tip for internal combustion engine Spark plug electrode tip for internal combustion engine

1996-05-06

1999-10-26

Patel, Ashok

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313144, H01T 1339

Patent

active

059734434

ABSTRACT:
A spark plug electrode wire composed of an iridium-rhodium alloy exhibits improved erosion resistance and enhanced durability in leaded and unleaded fuel environments. The alloy is formed into a wire having high thermal conductivity, low electrical resistivity, good oxidation resistance, good corrosion resistance, good wear resistance. It exhibits desirable work function in pure metals and alloys such as iridium and iridium-rhodium. The wire is inserted into the center electrode of the spark plug and brazed to an Inconel base metal and copper core thereof using a silver-based brazing alloy. After electrical engine dynamometer testing for 200 hours, an improvement in erosion resistance as high as eight fold was observed with an 60% iridium-40% rhodium alloy, when compared to a conventional 90% platinum-10% nickel alloy. The iridium-rhodium spark plug electrode wire can be used to minimize erosion and wear resistance in leaded and unleaded fuel environments.

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