Composite braze coating material and preparation method thereof

Abstract

The invention discloses a composite braze coating material which comprises a strip or platy braze coating material body with a three-layer structure, wherein the braze coating material body sequentially comprises a hard alloy coating, a brazing alloy layer and a brazing flux coating. The thicknesses of the hard alloy coating, and the brazing alloy layer and the brazing flux coating are adjusted between 0.001mm and 20mm. When the composite braze coating material is prepared, brazing alloy strips or plates are rolled according to design thickness, the upper surfaces of the brazing alloy strips or plates are coated with hard alloy particles in a cold spraying manner, the lower surfaces of the brazing alloy strips or plates are coated with brazing fluxes in a hot spraying manner, a certain sizes of composite braze coating material formed by the hard alloy coating, the brazing alloy layer and the brazing flux coating is prepared. The proportion of brazing alloys and the hard alloy particles is consistent, stability and consistency of braze coating quality can be effectively ensured, the brazing fluxes are quantitatively and automatically added and firmly deposited on the surfaces of the brazing alloys in a hot spraying manner, and the composite braze coating material is simple in preparation process, good in formability and convenient to store, transport and use.

Description

technical field [0001] The invention relates to a brazing coating material, in particular to a composite brazing coating material, and also relates to a preparation method of the composite brazing coating material. Background technique [0002] Cemented carbide has the advantages of high hardness, wear resistance and corrosion resistance. Some parts are often required to have high wear resistance and corrosion resistance on the local surface. If the parts are made of solid carbide, not only the cost is high, Moreover, the overall mechanical properties and other aspects often cannot meet the requirements. Through physical vapor deposition (PVD), chemical vapor deposition (CVD), thermal spraying, surfacing and brazing methods, a layer of hard alloy can be coated on the surface of the part to improve the wear resistance and durability of the part surface. performance such as corrosion. The physical vapor deposition method and the chemical vapor deposition method can only obta...

AI Technical Summary

Problems solved by technology

Traditional brazing materials are usually prepared by preparing powdery brazing material, cemented carbide particles, adhesives, organic matter, etc. into suspended slurry-like brazing materials or sheet-like brazing materials, and then coated or adhered to the surface of the workpiece. In order to prevent the oxidation of the base metal and powdered solder and promote the wetting and spreading of the solder on the surface of the cemented carbide particles and the base metal, it is often necessary to continuously add flux during the brazing coating process, which is low in work efficiency and easily causes a large amount of flux waste, high cost

Moreover, the powdery solder has a high oxygen content, and the organic matter is easy to produce carbon residues during the brazing process, resulting in various brazing defects such as pores and inclusions.

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