Composite metal foil and its manufacturing method

Abstract

The invention relates to a composite metal foil and a manufacturing method thereof, wherein the composite metal foil comprises an intermediate layer and surface layers covering the two sides of the intermediate layer, and the total thickness of the composite metal foil is 10-600 micrometers. The intermediate layer comprises the following elements of, by weight, 15-45% of Zn, 0.1-1.5% of Ag, 0.001-0.01% of Ni, 0.005-0.03% of Zr, 0.002-0.008% of Sc, 0.005-0.05% of Nd, and the balance Cu; the surface layers comprise the following elements of, by weight, 0.8-2% of Mn, 22-31% of Zn, 10-20% of Cu, 0.001-0.02% of Y, 0.001-0.08% of Nd, and the balance Ag. According to the composite metal foil and the manufacturing method thereof, compared with the existing art, the composite metal foil is excellent in alloy property and has high bonding degree with matrix materials, high process adaptability, high welding toughness and plasticity, and good welding compatibility, thereby being capable of beingapplied to the welding of a variety of combinations of matrix materials with the same system.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to composite metal materials, in particular to a composite metal foil and a manufacturing method thereof. Background technique [0002] Cemented carbide has excellent strength, hardness and wear resistance, and is a key material for the manufacture of wear-resistant machinery such as cutting tools, fixtures, and drill heads. Due to the low toughness and plasticity of cemented carbide and the high cost, cemented carbide machines are non-integral in practical applications, and are usually connected and fixed on the steel substrate by welding. Tools, jigs, drill heads and other machinery have been in service for a long time in large impact loads, large alternating loads, extrusion and corrosion environments, and their failures usually occur at welding. Therefore, the performance, precision and life of cemented carbide components are largely Depends on welding quality. Welding is a process...

AI Technical Summary

Problems solved by technology

[0003] When the existing solder is applied to the welding of hard alloy components, there are mainly the following deficiencies: 1) The alloy properties of the solder itself are not ideal, mainly manifested in high melting point, narrow solid-liquidus temperature zone, coarse grains, and brittleness; 2) The welding bonding between the solder and the base material is poor. Since the two sides are heterogeneous materials, it is difficult for the solder to achieve ideal metallurgical bonding with the base on both sides at the same time; 3) The solder is highly sensitive to the process, and the solder melt fluidity and crystal solidification require Ideal temperature field, but due to the small welding space and short welding time, the welding temperature field of brazing is difficult to control, especially when the solder fills the complex space, the temperature gradient is large, resulting in uneven structure of the welding area; 4) ductile plasticity of the welding area Poor, the solder alloy structure has defects such as microscopic slag inclusions, brittle intermetallic compounds, and micro-area welding cracks. The heterogeneous materials on both sides of the solder have different thermal expansion coefficients. The thermal stress remains in the welding area. In the actual service process, the welding area is prone to brittleness or fatigue damage; 5) The compatibility of the solder is poor. The same solder can only be used for welding of heterogeneous materials in a fixed combination, and the industrial cost is high.

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