Modified 3D printing ultramicro aluminum alloy powder and preparation method thereof

Abstract

The invention discloses modified 3D printing ultramicro aluminum alloy powder and a preparation method thereof. The modified 3D printing ultramicro aluminum alloy powder comprises, by weight, 95-99.5 parts of aluminum alloy powder, 0.25-5 parts of cesium fluoroaluminate and 0.25-5 parts of potassium fluoroaluminate, wherein the particle size of the aluminum alloy powder ranges from 10 micrometers to 50 micrometers, and oxygen content thereof is less than 500 ppm. The preparation method includes the steps of A, preparing the aluminum alloy powder by gas atomization, wherein the particle size of the obtained aluminum alloy powder ranges from 10 micrometers to 50 micrometers, and oxygen content thereof is less than 500 ppm; B, weighing the aluminum alloy powder, the cesium fluoroaluminate and the potassium fluoroaluminate according to the above parts by weight; C, putting the cesium fluoroaluminate and the potassium fluoroaluminate into the aluminum alloy powder, and conducting dry mixing for 20-100 minutes so as to obtain the modified 3D printing ultramicro aluminum alloy powder. The modified 3D printing ultramicro aluminum alloy powder reduces reflection of the aluminum alloy powder, enables sintering to be uniform and thorough during printing and is high in printed product quality.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and relates to a 3D printing material and a preparation method thereof, in particular to a modified 3D printing ultrafine aluminum alloy powder and a preparation method thereof, which are suitable for 3D printing by a metal laser selective sintering method. Background technique [0002] In 3D printing technology, selective laser sintering (SLS) is a method that uses infrared lasers as energy sources and powder materials as printing modeling materials. During the printing process, the powder is first preheated to a certain temperature, and then the powder is flattened under the action of the scraper; the laser beam is selectively sintered according to the information of the layered section under the control of the computer, and then the powder is sintered after one layer is completed. The next layer is sintered, and after all the sintering is completed, the excess powder is removed, and then a...

AI Technical Summary

Problems solved by technology

[0003] At present, when using aluminum alloy powder for metal laser sintering 3D printing, the system controls the laser beam to emit on the flat aluminum alloy powder. Due to the high reflectivity of aluminum itself, part of the laser light is reflected by the aluminum alloy powder, which directly causes the aluminum alloy powder Insufficient absorption of laser light will cause defects such as uneven sintering or incomplete sintering of aluminum alloy powder, which will affect the final quality of the product and cause waste of materials and energy.