Compound brazing filler metal used for hard alloy tool brazing and preparation method thereof

Abstract

The invention relates to compound brazing filler metal used for hard alloy tool brazing. The compound brazing filler metal is composed of 25%-27% of Ag, 37%-39% of Cu, 3.0%-5.0% of Mn, 2.0-4.0% of Ni,1.5%-2.5% of In, 0.5%-1.0% of nano-SiCp, 0.15%-0.3% of Si, 0.1%-0.2% of B, 0.05%-0.1% of Co, 0.01%-0.05% of Fe, 0.01%-0.1% of La, Ce and Y mixed rare earth and the balance Zn, wherein the mixed rareearth includes at least two of La, Ce and Y. A preparation method includes the steps that firstly, raw materials are weighed according to the ratio; secondly, segmented variable-speed high-energy ballmilling is conducted on Cu powder and nano-SiCp to obtain Cu/nano-SiCp particles; thirdly, the Ag, Cu ingots, the Zn, the Mn, the Ni, the Si, the Co and the Fe are placed in a medium-frequency induction smelting furnace to be heated and molten, and then the In, the B, the Cu foil wrapped mixed raw earth and the Cu/nano-SiCp particles are sequentially added in a crucible; fourthly, the mixture ismoved into a well type resistance furnace to be subjected to ultrasonic vibration and squeeze casting forming; and fifthly, hot rolling and cold rolling are conducted on cast ingots to form the foil sheet brazing filler metal. By means of segmented variable-speed ball milling and ultrasonic vibration, uniform dispersion of the nano-SiCp is ensured, the brazing filler metal is good in wettability and joint filling capacity, the brazing manufacturability is good, the preparation method is simple, and the finished product rate is high.

Description

technical field [0001] The invention belongs to the technical field of brazing materials, and in particular relates to a composite brazing material used for brazing of cemented carbide tools and a preparation method thereof. Background technique [0002] Cemented carbide has excellent properties such as high hardness, high strength, wear resistance and good red hardness. It is often used to make knives and various parts with wear resistance as the main performance. It is widely used in mechanical processing, geological exploration, mining, etc. fields such as mining. [0003] In recent years, the number of carbide cutting tools has been increasing, and now accounts for more than 60% of all cutting tools. Since hard alloys are difficult to prepare large-scale and complex-shaped tools, most hard alloys are embedded in steel substrates by brazing. [0004] Welded carbide tools have the advantages of high hardness, good wear resistance, good heat resistance, high cutting perfo...

AI Technical Summary

Problems solved by technology

Although the brazing material described in this patent can improve the wear resistance and working strength of the brazed joint, the method requires high technology, cumbersome process and low production efficiency.

For this reason, Publication No. CN 110076474 A discloses a cemented carbide clad welding material and its preparation method that can improve the performance of brazed joints and can be produced on a large scale. And high requirements on the joint surface, hot extrusion process and difficult control of the quality of the extruded clad material limit the application and production of the clad material

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