SPARK PLUG ELECTRODE HAVING IRIDIUM BASED SPHERE AND ITS MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a spark plug having a significantly increased life, since cracks at a welded joint is prevented, and to provide its manufacturing method. SOLUTION: This spark plug includes a rivet-shaped or a spherical iridium alloy tip portion. The tip portion is coated with platin...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	FRANZ LEE RANDALL, TAYLOR RICHARD DALE, CHANG CHIN-FONG, LEONE EDGAR ARNOLD
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CORONA DEVICES DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRICITY GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY OVERVOLTAGE ARRESTERS USING SPARK GAPS SPARK GAPS SPARKING PLUGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a spark plug having a significantly increased life, since cracks at a welded joint is prevented, and to provide its manufacturing method. SOLUTION: This spark plug includes a rivet-shaped or a spherical iridium alloy tip portion. The tip portion is coated with platinum, annealed, and then resistance welded to the nickel based electrode of the spark plug. The platinum coating helps to prevent cracks from being caused at the welded joint part. Otherwise, the cracks are considered to be caused by a difference in coefficients of thermal expansion between the nickel based alloy electrode and the iridium based alloy tip portion. In addition, the iridium alloy tip portion is not susceptible to attack by lead or combustion gas. Thereby, the life of the spark plug is significantly increased. COPYRIGHT: (C)2005,JPO&NCIPI