The article presents an evaluation of Pt – NiCr joints on spark plug electrodes based on SEM (scanning electron microscope) images. A qualitative and quantitative analysis of the joint composition at its characteristic points was performed. Laser welding and resistance welding methods were compared. Laser welding demonstrates a significantly better technology for joint durability.High gasoline prices have necessitated the search for and use of alternative gaseous fuels: LPG, CNG, Biogas. For these types of fuels, the operating criteria for spark plugs (temperature, environment, electrical erosion) have changed drastically, reducing the durability of the plugs. To minimize this phenomenon, special metal alloys are used. New materials such as yttrium, iridium, platinum, silver, etc., have been introduced.
Laboratory tests have shown that iridium is an excellent material for the production of the highest quality spark plugs. It belongs to precious materials and is used in advanced technologies. Iridium is the most durable among precious metals and is resistant to most chemical compounds. It only melts at a temperature of 2450 oC. (…)
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Source: Logistyka Magazine
EVALUATION OF Pt – NiCr JOINTS ON SPARK PLUG ELECTRODES – PDF file for download