3D printing metal powder, 3D printing method and method for preparing 3D printing metal powder

Abstract

The invention provides 3D printing metal powder, a 3D printing method and a method for preparing 3D printing metal powder. The method for preparing the 3D printing metal powder comprises the followingsteps: decomposing metal basic powder into a metal powder matrix by a mechanical grinding process; adding reinforced particles in the metal basic powder matrix and mixing the metal powder matrix andthe reinforced particles; adding a binder and bonding the metal powder matrix and the reinforced particles by the binder and through a spray drying process so as to obtain disperse particles, whereinthe size of the disperse particles is more than those of the metal powder matrix and the reinforced particles; and removing the binder from the disperse particles by a sintering process so as to obtain 3D printing metal composite powder. Uniform reinforcement can be guaranteed and the mechanical property and the function of the nanoparticles can be improved; and furthermore, the internal microcracks of the metal powder added with the nanoparticles can be reduced.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to 3D printing metal powder, 3D printing and a method for preparing 3D printing metal powder. Background technique [0002] The additive manufacturing process (Additive Manufacturing) is one of the important 3D printing technologies. The additive manufacturing process can quickly manufacture the pre-designed CAD model, and can manufacture parts with complex structures in a short period of time. The Selected Laser Melting (SLM) process is a kind of additive manufacturing (Additive manufacturing) technology, which can quickly manufacture the same parts as the CAD model through laser sintering. At present, the selective laser melting process has been widely used. Different from traditional material removal mechanisms, additive manufacturing is based on the complete opposite materials incremental manufacturing philosophy (materials incremental manufacturingphilosophy), in which se...

AI Technical Summary

Problems solved by technology

[0003] In addition to the above-mentioned advantages of additive manufacturing technology, the application of additive manufacturing in key components with desired mechanical properties still needs to face greater challenges

Based on recent research, although additive manufacturing generally has qualified room temperature elongation performance (qualified room temperature elongation performance), the metal material of the printed part usually shows lower fatigue properties and high temperature creep properties (high temperature creep properties)

In addition, residual stresses generated during additive manufacturing can lead to microcracks, especially on hard-welding alloys, such as CM247 alloy, whose mechanical properties will be further degraded

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