Electrode nozzle of electric arc spraying coater in supersonic speed and manufacturing method

Abstract

An electric conducting tip for the supersonic arc-spraying machine is composed of the cylindrical front half made of cermat prepared from tungsten carbide, titanium carbide, tatalum carbide, niobium carbide and chromium (or cobalt or nickel) of carbide for high antiwear performance, and the cylindrical back half made of Cu alloy prepared from Cu, Cr, Zr, Mg and Ce or Y alloy.

Description

Technical field [0001] The invention relates to a conductive tip of a supersonic arc spraying machine and a manufacturing method thereof. Background technique [0002] When the metal arc spraying machine is working, the two metal wires of the contact tip generate an arc. Due to the high temperature of the arc, the metal wire is melted, atomized under the impact of high-pressure gas and forms high-speed moving particles that are sprayed onto the surface of the workpiece to form a coating. layer. [0003] When the contact tip is used for arc spraying, it is used as a conductor to transmit current to the metal wire, so it must have good electrical conductivity, and at the same time ensure good contact with the metal wire. The surface contact resistance between the contact tip and the metal wire is required to be small, otherwise it may be Causes heat generation and ablation of parts. [0004] The sliding friction between the contact tip and the metal wire causes the rapid wea...

AI Technical Summary

Problems solved by technology

If the inner hole of the contact tip is severely worn, the spatial position of the metal wire will change, resulting in misalignment of the two metal wires and inaccurate focus at the ends of the two metal wires; at the same time, the contact between the metal wire and the contact tip is unstable, and the contact resistance increase; these will lead to arc instability, severe arc will be broken, which will greatly affect the coating quality and production efficiency

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