3D printing metal powder and preparation method thereof

Abstract

The invention discloses 3D printing metal powder and a preparation method thereof and relates to the technical field of metal materials. The 3D printing metal powder disclosed by the invention adoptstitanium alloy powder, nickel powder and chromium powder which are different in particle size and proportion as raw materials; ultrasonic water atomization is adopted for preparing the metal powder; the high frequency of ultrasound is beneficial for achieving a cavatition effect in molten metal so that the molten metal is uniformly split into small liquid drops; the preparation method is combinedwith a water atomization method; on one hand, the relatively large specific heat capacity and the high cooling speed of water are beneficial for industrial large-scale production; on the other hand, water is used as a medium, which is beneficial for reducing the generation rate of hollow powder and satellite powder; the prepared powder is good in compression formability; the strength of a printedfinished product is enhanced; meanwhile the final annealing treatment reduces the oxidization effect of oxygen in water to metals; and the overall preparation method is simple and is low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a 3D printing metal powder and a preparation method thereof. Background technique [0002] 3D printing, also known as rapid prototyping, has attracted people's attention since its appearance, and 3D printing materials that determine the quality of 3D printed products have also received widespread attention. At present, the raw materials used in 3D printing materials according to the different printed products mainly include polymer materials, metal materials, ceramic materials, etc. Since metal materials have special properties and gloss that cannot be compared with other materials, the printed products are used in automobiles, molds, Energy, aerospace and other industries have broad application prospects. [0003] The metal raw materials commonly used in 3D printing are divided into powder form and wire form. Since metal powder can be used in selective laser melting (Se...

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Problems solved by technology

At present, the preparation methods of metal powder for 3D printing mainly include atomization method, plasma method, rotating electrode method, plasma fuse method, etc. Among them, the atomization method has the advantages of low environmental pollution, high powder sphericity, and low oxygen content. And the advantages of large cooling rate have become the main method for producing high-performance spherical metal and alloy powders, but the inventors found in the process of preparing 3D printing metal powders by atomization methods that the existing 3D printing metal powders prepared by atomization methods There are hollow powder and satellite powder with a large proportion in the powder. Hollow powder and satellite powder will cause residual pores in the part, which are difficult to eliminate even after the subsequent heat treatment process, and have a serious impact on the mechanical properties of the formed part, especially the fatigue resistance.

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