Nickel core coating braze coating material

Abstract

The invention provides a nickel core coating braze coating material. The nickel core coating braze coating material is of a double-layer structure, is in a wire shape or a strip shape and comprises aninner core material and a coating layer wrapping the outer part of the inner core material, wherein the inner core material is a pure nickel wire or a pure nickel strip with a plurality of grooves inthe surface; and the coating layer comprises, by weight, 5 parts of organic binding agents, 15-45 parts of WC particles, 6 parts of brazing flux and the balance brazing filler metal powder. A preparing method of the nickel core coating braze coating material comprises the steps that the brazing filler metal powder, the WC particles, the brazing flux and the organic binding agents are prepared into suspension slurry to be added into a powder coating cylinder of a press coating device, the pure nickel wire or the pure nickel strip is fed into the powder coating cylinder through a wire feeding mechanism, the surface of the pure nickel wire or the pure nickel strip is evenly coated with the suspension slurry through the press coating device, the coating layer is formed, drying is conducted through a tunnel drying oven, and the nickel core coating braze coating material is obtained through a winding device. The bonding strength of a coating of the nickel core coating braze coating materialis high, the problem that nickel base brazing filler metal is difficult to machine into wires or strips is solved, and automatic production can be achieved in the braze coating process.

Description

technical field [0001] The invention relates to the technical field of brazing materials, in particular to a nickel core coating brazing material. Background technique [0002] High-performance PDC drill bits, tools, molds, and wear-resistant parts all require high wear resistance and corrosion resistance. If the parts are made of overall wear-resistant alloys or corrosion-resistant materials, not only the cost is high, but also the overall mechanics The performance often cannot meet the requirements. The reasonable solution is to use surface technology to apply a layer of wear-resistant or corrosion-resistant metal or alloy on the surface of the part. As far as the wear-resistant layer is concerned, the commonly used methods are physical vapor deposition (PVD), Chemical vapor deposition (CVD), thermal spraying, surfacing and brazing, physical vapor deposition and chemical vapor deposition can only obtain very thin coatings, and the price is high and the use is limited; Spr...

AI Technical Summary

Problems solved by technology

[0002] High-performance PDC drill bits, tools, molds, and wear-resistant parts all require high wear resistance and corrosion resistance. If the parts are made of overall wear-resistant alloys or corrosion-resistant materials, not only the cost is high, but also the overall mechanics The performance often cannot meet the requirements. The reasonable solution is to use surface technology to apply a layer of wear-resistant or corrosion-resistant metal or alloy on the surface of the part. As far as the wear-resistant layer is concerned, the commonly used methods are physical vapor deposition (PVD), Chemical vapor deposition (CVD), thermal spraying, surfacing and brazing, physical vapor deposition and chemical vapor deposition can only obtain very thin coatings, and the price is high and the use is limited; Spray coating is a kind of mechanical interlocking coating, the bonding force between coating and substrate is poor, the heating temperature of surface surfacing is high, it is easy to produce thermal stress and deformation, and the surface formability is poor. The brazing coating method is that the brazing coating and the base metal It is metallurgical combination, the bonding strength is much higher than the mechanical bonding of thermal spraying, the heating temperature of brazing coating is lower than that of surfacing welding, the change of thermal stress and base metal properties is small, the surface of brazing coating is smooth, and the construction accuracy is high. A small amount of processing can achieve the required precision;

[0003] The brazing material is composed of two parts: one part is the usual solder alloy, which has a lower melting temperature and is commonly known as a low melting point component; the other part is a hard alloy with a high melting point, commonly known as a high melting point component. Brazing filler metals can be used as low-melting point components of brazing coating materials, but as a wear-resistant layer, the brazing filler metal itself is required to have a certain hardness, and soft ones are not enough. At present, nickel-based brazing filler metals are commonly used, which are hard, Brittle, poor processability, difficult to process into wire or strip solder

The traditional method is to make nickel-based solder into powdered solder, and then prepare a suspended slurry brazing material with cemented carbide particles, binders, organic matter, etc., and coat or stick on the surface of the workpiece to prevent Oxidation of the base metal and powdered brazing material and promotion of the wetting and spreading of the brazing material on the surface of the cemented carbide particles and the base metal. During the brazing coating process, it is often necessary to continuously add brazing flux. The work efficiency is low and it is easy to cause a lot of waste of brazing flux. higher cost

Images