SPARK PLUG TIP HAVING PLATINUM BASED ALLOYS

A spark plug and method of making same, wherein the spark plug includes a platinum alloy tip portion which takes the form of a rivet or a sphere. The tip portion is annealed in an annealing furnace at a temperature between about 700 DEG -1400 DEG C. for a time between about 5-30 minutes. The anneale...

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Bibliographische Detailangaben
Hauptverfasser:	CHANG, CHIN-FONG, TAYLOR, RICHARD, DALE, FRANZ, LEE, RANDALL, LEONE, EDGAR, ARNOLD
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS BASIC ELECTRIC ELEMENTS CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMISTRY CORONA DEVICES ELECTRICITY FERROUS OR NON-FERROUS ALLOYS GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES METALLURGY OVERVOLTAGE ARRESTERS USING SPARK GAPS SPARK GAPS SPARKING PLUGS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A spark plug and method of making same, wherein the spark plug includes a platinum alloy tip portion which takes the form of a rivet or a sphere. The tip portion is annealed in an annealing furnace at a temperature between about 700 DEG -1400 DEG C. for a time between about 5-30 minutes. The annealed tip portion is then resistance welded to an electrode of the spark plug. The annealing provides the tip portion with added resistance to corrosion and attack by lead. Preferred embodiments of the spark plug tip material comprise 80% platinum-20% rhodium; 80% platinum-20% iridium; 96% platinum-4% tungsten; and Pt (bal)-Ir(a)%-W(b)%, where "a" ranges from about 15 to 19 percent by weight, "b" ranges from about 1 to 4 percent by weight, and the balance is comprised of platinum and incident impurities, and wherein the sum of iridium and tungsten present ranges from about 16 to 19.