Special copper alloy powder for laser-sensing composite fusion-covering high-strength high-conductivity copper alloy coating

Abstract

The invention discloses special copper alloy powder for a laser-sensing composite fusion-covering high-strength high-conductivity copper alloy coating, and the alloy powder comprises the following chemical components: 2 to 5 percent by weight of titanium (Ti); 1 to 3 percent by weight of magnesium (Mg); 0.1 to 0.5 percent by weight of Zirconium (Zr); 0.2 to 1 percent by weight of boron (B); 5 to 10 percent by weight of aluminum (Al); 8 to 15 percent by weight of nickel (Ni); 0.8 to 2 percent by weight of niobium (Nb), 3 to 8 percent by weight of tungsten (W); 0.01 to 0.5 percent by weight of hafnium (Hf); 0.05 to 0.5 percent by weight of scandium (Sc); and balance of copper (Cu). The special copper alloy powder has the advantages that the special copper alloy powder has good technical compatibility with technical characteristics of the laser-sensing composite fusion covering, a crack-free copper alloy coating with high wearing resistance, high conductivity and excellent high-temperature flexibility can be prepared under a high efficient condition, the effective balance and combination of high strength and high conductivity of the copper alloy can be realized, and the special copper alloy powder has wide application prospect in the fields such as surface enhancing and repairing for copper crystallization rollers, copper crystallizers and electromagnetic gun rails.

Description

technical field [0001] The invention belongs to the technical field of material science and surface engineering, in particular to a special copper alloy powder for laser-induction composite cladding high-strength and high-conductivity copper alloy coating. Background technique [0002] High-strength and high-conductivity copper alloy has excellent comprehensive properties, such as high strength and toughness, high wear resistance and high corrosion resistance, high electrical conductivity and high thermal conductivity, etc., and is the key to industrial fields such as integrated circuit lead frames, electrical contact materials, heat sinks, and crystallizers. Parts have very broad application prospects. Therefore, solving the contradiction between high electrical conductivity and high strength of copper alloys and developing related preparation techniques have attracted great attention. At present, some high-strength and high-conductivity copper alloys used in the industria...

AI Technical Summary

Problems solved by technology

Therefore, there are several problems in the following aspects: (1) The distribution of alloying elements and particle size is not uniform, and the formed laser cladding copper alloy coating is prone to microstructure segregation and pores, resulting in the strength, toughness, wear resistance and corrosion resistance of the copper alloy coating. Corrosion resistance, electrical conductivity and thermal conductivity are not high; (2) The characteristics of rapid heating and rapid solidification of laser cladding make the temperature gradient in the laser cladding process extremely large, and the heat between the prepared copper alloy coating and the substrate The large difference in physical properties leads to the cracking of the copper alloy coating, which largely limits the development of laser cladding technology and its wide application in the industrial field.

However, the alloy powder used for laser-induction composite cladding without crack coating is usually used for thermal spraying alloy powder. Although the temperature gradient in the process of laser-induction composite cladding has been greatly reduced, the thermal spray coating There is a large difference in thermophysical properties between the alloy powder and the substrate, and only a small part of the high-performance crack-free coating can be prepared within a small laser-induction composite cladding processing window