Precious metal alloy composite material electrode for spark plug and manufacturing method thereof

Abstract

The invention discloses a precious metal alloy composite material electrode for a spark plug. The precious metal alloy composite material electrode for the spark plug comprises a precious metal alloy composite material electrode body which is fixed on a central electrode of the spark plug and a grounding electrode base in a welding mode, wherein the precious metal alloy composite material electrode body comprises a precious metal alloy electrode matrix and a composite layer which is coated on the surface of the precious metal alloy electrode matrix and at least part of the composite layer is welded with the precious metal alloy electrode matrix; and the surface layer of the composite layer is alloy of base main body material X. By arranging the composite layer which uses the base main body material or the alloy of the base main body material as the surface layer on welding surface of the precious metal alloy electrode and conducting surface modification on the precious metal alloy composite material electrode body, the composite layer can placed between different welding materials to participate in alloying; due to the fact that an alloy layer has the same homogeny with the precious metal alloy electrode base, a continuously gradient solid solution area organization is formed in welding, binding force of welding precious metal alloy with nickel electrode base is improved, and yield is improved of the precious metal alloy electrode and service life of the precious metal alloy electrode is prolonged.

Description

technical field [0001] The invention relates to a spark plug ignition electrode material, in particular to a noble metal alloy composite material electrode used for a spark plug center electrode and a side electrode and a manufacturing method thereof. Background technique [0002] The traditional spark plug electrode material is nickel alloy. In order to increase the ignition temperature and reduce the ignition gap, precious metal materials such as platinum, iridium or their alloys are welded on the end face of the nickel alloy, which greatly improves the ignition performance of the spark plug. Precious metal alloys used as spark plug electrodes can improve the ignition temperature of the engine, fuel economy, service life and reduce the emission of harmful substances. It is an ideal spark plug electrode material in the gasoline engine ignition system. [0003] The relevant research on the influence of the composition control of noble metal alloys on the high temperature oxi...

AI Technical Summary

Problems solved by technology

Although this method removes the joining interface of the iridium alloy part from the high temperature area where the spark occurs, it still requires the bonding of other joining interfaces (such as between the iridium alloy and the base part and the base part and the housing), these additional interfaces need Additional material and processing steps, and thus additional processing costs, which also represent additional potential failure points due to potential processing defects and thermal fatigue processes during spark plug operation

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