Precision pulse arc spot welding ceramic particle planting method

Abstract

A precision pulse arc spot welding ceramic particle planting method comprises the following steps that (1) the surface of a to-be-planted workpiece is polished, leveled and cleaned; (2) a metal conductive layer is plated on the surfaces of to-be-planted ceramic particles; (3) the workpiece is connected to a negative electrode of spot welding equipment, a tungsten electrode is connected to a positive electrode of the spot welding equipment, the surface metallized ceramic particles are uniformly arranged on the surface of the to-be-planted workpiece, precise pulse arc spot welding equipment is started, and particle planting parameters are set; (4) welding wires are introduced between the electrodes and the particles, the welding wires, the particles and the workpiece are in direction contact, a power supply is turned on when the electrodes are a certain distance away from the workpiece to form pulse arcs, and the pulse spot welding particle planting process is completed; and (5) large-area ceramic particle planting is completed in a point-by-point planting mode, so that a wear-resistant coating is formed. The method can realize large-area ceramic particle planting.

Description

technical field [0001] The invention relates to a precise pulse arc spot welding ceramic particle planting method, which belongs to the technical field of aero-engine turbine blades wear-resistant coatings. Background technique [0002] The airtight seal of aero-engine is an important factor affecting the efficiency of the engine. At present, the fan blades and compressor turbine blades in the low temperature section are sealed with a wear-resistant coating on the tip and a wear-resistant sealing coating on the inner surface of the casing to improve air tightness. With the increasing performance of the engine, the wear-resistant coating of the blade tip in the high temperature section has gradually attracted attention. High temperature section (greater than 850 ℃) blades usually use single crystal superalloy to obtain better high temperature performance. Compared with the blades in the low temperature section, the working stress and temperature of the blade tips in the hig...

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Problems solved by technology

However, there are still many problems in the preparation process of the wear-resistant coating on the blade tip of the high-temperature section (mainly electrodeposition, brazing, spark discharge planting, etc.) that need to be further studied, such as insufficient bonding force, and the preparation process has no effect on the microstructure and properties of the base metal. Large impact, low efficiency, etc., the development of a new coating preparation process has also become a necessary way for the mature application of high-temperature blade tip wear-resistant coatings

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