Preparation method for spherical metal-based rare-earth nano composite powder capable of being used for three-dimensional printing and product prepared through same

Abstract

The invention discloses a preparation method for spherical metal-based rare-earth nano composite powder capable of being used for three-dimensional printing. The preparation method comprises the steps that (1) light metal raw materials are added into a crucible of an electric induction furnace, and the induction current is regulated and controlled for heating the light metal raw materials so as to enable the light metal raw materials to be melted into a liquid melt; (2) the temperature of the light metal melt is controlled to be higher than the melting point of the light metal melt by 50-100 DEG C, and 0-20.0wt% of nano materials are added into the metal melt and are ensured to be uniformly dispersed so as to form a mixed melt; (3) 0-1.0wt% of rare earth materials are added into the mixed melt formed in the step (2) and are ensured to be uniformly dispersed; (4) elements subjected to burning loss are compensated so as to adjust chemical components of an alloy; and (5) high-purity argon gas is started and is concentrated to reach an atomizing nozzle in one branch, the atomizing gas pressure and the power are kept, and the uniformly-mixed composite material melt flows out from an infusion tube, is broken into small spherical droplets under the action of high-pressure gas after falling off freely for a certain distance and rapidly condenses into spherical powder particles. A product prepared by adopting the method can be more effectively applied to a three-dimensional printing technology.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method and product of a spherical metal-based rare earth nanocomposite powder that can be used for three-dimensional printing. Background technique [0002] In recent years, in the development of metal matrix composite materials, the development of light metal (aluminum, lithium, magnesium, titanium and other pure metals and their alloys) matrix composite materials is particularly rapid. Nanomaterials have a special microstructure of ultra-fine grains and a large number of internal interfaces, so they have many special mechanical and physical and chemical properties. Adding nanomaterials can effectively improve the tensile strength, hardness, wear resistance, etc. of light metal matrix composites, and can Change the physical properties of light metals such as electrical conductivity, thermal conductivity, and thermal expansion coefficient. Therefore, the pr...

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Problems solved by technology

This method has the following disadvantages: (1) The agglomeration of nanomaterials occurs due to strong van der Waals force and large surface tension, and the density difference between nanomaterials and light metals is large. It is difficult to disperse uniformly in light metal powder, thus forming stress concentration points in light metal matrix nanocomposite 3D printed parts, resulting in cracks and brittleness

(2) Light metal powders with strong ductility are prone to extrusion deformation under the action of grinding balls, the shape changes from spherical to flake or spherical, the fluidity of the powder decreases, and the compaction density decreases

(3) The wettability between the nanomaterials and the light metal matrix phase is very poor, and at the same time, the difference in thermal expansion coefficient between them is large, resulting in that the liquid phase formed during the forming process cannot be spread uniformly, and the subsequent solidification process Cracks appear due to large shrinkage stress

(4) The heat accumulation effect of the ball milling process can easily lead to a sharp increase in the oxygen content of the light metal powder. The ball milling process needs to be carried out in a vacuum or a protective atmosphere, which increases the manufacturing cost

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