A kind of preparation method of slm type 3d printing cufe alloy

Abstract

The invention relates to a preparation method of an SLM type 3D printing CuFe alloy, and belongs to the technical field of non-ferrous metal material manufacturing. In the CuFe alloy, mixed powder ofCuFe given components is selected, wherein the mixed powder comprises, by mass percent, 20-60% of gas atomized copper powder and the balance Fe powder, the powder particle size of the Fe powder is required to be 30-55 micrometers, the powder particle size of the gas atomized copper powder is required to be 20-50 micrometers, and the sphericity of the powder is required to be larger than 80%. The preparation method comprises the steps of 1, mixed powder preparation; 2, SLM type 3D printing; 3, linear cutting and de-sampling; 4, heat treatment in an argon atmosphere protection environment; and 5, surface machining. The CuFe alloy prepared through the method is uniform and compact in metallographic structure and good in processability, the conductivity can reach 40% or above, the size and shape are not limited, a machining mode is not influenced by high iron content, a finished product or a semi-finished blank can be directly machined, and the machining mode is easy to popularize.

Description

technical field [0001] The invention relates to the technical field of manufacturing non-ferrous metal materials, in particular to a method for preparing CuFe alloy by SLM 3D printing. Background technique [0002] Copper-iron alloys are metastable and immiscible alloys. When a small amount of dispersed phase is distributed in the matrix, the alloy will exhibit special physical and mechanical properties. It has a good application prospect in the field of electronics and electronics industry. Copper-iron alloy plate wire with low iron content is widely used in the preparation of electrical engineering switch bridges, large-scale integrated circuit lead frames, resistance welding electrodes, etc. With the gradual increase of iron content, copper-iron alloy plate wire has excellent magnetoresistance effect , so it is widely used in electromagnetic wave shielding materials. [0003] Patent CN108456799A discloses a high-performance copper-iron alloy material and its preparation...

AI Technical Summary

Problems solved by technology

The copper-iron alloy processed by this processing method has great restrictions on Fe content, and the processing technology is complex, requiring more cold working and heat treatment; patent CN109576516A discloses a short-process preparation method of copper-iron alloy plate wire for electromagnetic wave shielding, and the specific method It is to select a certain proportion of copper-iron alloy material to make melt and then spray deposition to obtain excellent copper-iron alloy strip

This method also has great restrictions on the iron content, the range of molding materials is narrow, and the operation requirements are very high, so it is not easy to popularize and use

[0004] The traditional preparation method of copper-iron alloy plate and wire is melting and casting into ingot, and then processing it into plates or wires of various sizes and specifications through extrusion, rolling, drawing and other plastic deformation methods. For Cu with Fe content less than 30%, -Fe alloys can be prepared by traditional methods, but for Cu-Fe alloys for electromagnetic wave shielding with an iron content of 30 to 60%, the method has the following problems: due to the higher Fe content, it is very easy to macrosegregate, making Casting and processing are very difficult, and the success rate of ingot production is low; with the increase of Fe content, the deformation resistance of the alloy increases rapidly, and it is easy to crack during processing, so the number of deformations has to be increased to achieve the deformation effect, which increases the preparation time. processes, reducing production efficiency and increasing preparation costs

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