Iridium-cobalt alloy, preparation method and application

Abstract

The invention provides an iridium-cobalt alloy, a preparation method and application. The iridium-cobalt alloy comprises 45-65 wt% of iridium, and 35-55 wt% of cobalt. The preparation method comprisesthe following steps of 1) weighing the cobalt and the iridium according to the mass percent, and putting the cobalt and the iridium in a vacuum environment; 2) heating the mixture of the cobalt and the iridium to obtain alloy liquid; 3) pouring the alloy liquid obtained in the step 2) into a smelting mold for casting; and 4) carrying out homogenization treatment on an alloy ingot obtained in thestep 3). The iridium-cobalt alloy, the preparation method and the application have the advantages that the iridium and an iridium-rhodium alloy can be welded to an Inconel 600 alloy, the welding performance is excellent, the iridium-cobalt alloy can be applied to an Iridium electrode of a high-level spark plug and has the important practical application value; and when the iridium-cobalt alloy isused for preparing the sparking plug electrode, precious metal can be saved by 35-55%; the problem that the welding quality is unstable due to the fact that the difference between the thermal expansion coefficients of Iridium and an nickel-based alloy is large can be solved; and the problem that the welding quality of the large-size Iridium and the nickel-based alloy is poor can be solved.

Description

technical field [0001] The invention belongs to the field of preparation of spark plug electrodes, and in particular relates to an iridium-cobalt alloy, a preparation method and an application. Background technique [0002] All gasoline engines have spark plugs, one per cylinder, and some high-speed gasoline engines have two spark plugs per cylinder. Although the spark plug is small, it affects the engine's starting ability, fuel consumption and exhaust emission level. If the engine is the heart of the car, then the spark plug is the "pacemaker" of the "heart". [0003] The function of the spark plug is to introduce the high-voltage electricity (above 10,000 V) generated by the ignition coil into the engine cylinder, and generate sparks between the electrodes of the spark plug to ignite the air-fuel mixture. Among them, the working environment of the spark plug electrode as the discharge part is extremely harsh. Take the spark plug of an ordinary four-stroke gasoline engi...

AI Technical Summary

Problems solved by technology

[0013] In order to solve the above-mentioned technical problems, the present invention provides a kind of iridium that can solve the problem of unstable welding quality caused by the large difference in thermal expansion coefficient between noble metals and nickel-based alloys; and can solve the problem of poor welding quality between large-scale noble metals and nickel-based alloys Cobalt alloy, preparation method and application, and its use in the preparation of spark plug electrodes can save 35-55% of precious metals and improve the performance of spark plug electrodes