Laser additive technology for preparing tungsten-copper composite material with infinite thickness

Abstract

The invention discloses a laser additive preparation method of an infinite-thickness tungsten-copper composite material. A copper substrate, copper powder and tungsten powder are used as raw materials, a laser additive system is adopted, laser adopts a mode that a plurality of beams of light are converged into flat-top light, tungsten powder and copper powder are synchronously and alternately fed by adopting the center of a cladding head to form combination in which the light coats the powder, and a tungsten-copper alloy layer and a copper layer are alternately formed on the copper substrate. In the alloying stage, the tungsten powder is sent out, copper on the surface of the pure copper is melted, and the tungsten powder is alloyed to form the tungsten-copper alloy layer; and in the copper layer cladding stage, only copper powder is sent out, and copper cladding is carried out on the tungsten-copper alloying layer line by line, so that a copper deposition layer is formed. According to the laser additive preparation method, the laser cladding technology and the laser alloying technology are organically combined, the tungsten-copper density difference is changed into the advantage, and the hysteresis effect of a static magnetic field inhibits movement of tungsten particles in a molten pool; and the tungsten-copper composite layer prepared through laser additive manufacturing can achieve manufacturing of large-size components through multi-layer accumulation.

Description

technical field [0001] The invention relates to the field of metal manufacturing, in particular to a laser additive preparation technology for a tungsten-copper alloy layer. Background technique [0002] Tungsten-copper composite material is a two-phase composite material composed of two elements, tungsten (W) and copper (Cu). The physical properties of W and Cu elements, such as melting point, density, hardness, thermal conductivity, etc., are significantly different. Composite materials combine a series of excellent properties of the two, such as high electrical and thermal conductivity, high melting point and high hardness, low thermal expansion coefficient and strong arc ablation resistance. Due to its unique properties, it has broad application and development prospects in the fields of electronic information, military defense, aerospace and other fields. In the past few decades, researchers have done a lot of scientific research on the preparation methods of high-dens...

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Problems solved by technology

In the process of using SLM tungsten copper materials, most of Cu powder and W powder need to be pre-mixed by ball milling. The process is complicated and needs to be prepared in a closed cavity, which greatly limits the size of the parts and the overall cost is too high.

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