Nano-crystalline anisotropic magnet prepared by 3D (three-dimensional) printing technique

Abstract

The invention discloses a method for preparing a nano-crystalline anisotropic magnet by a 3D (three-dimensional) printing technique. The method includes that: hard magnetic alloys including neodymium iron boron alloy, samarium cobalt alloy, aluminum nickel cobalt alloy, manganese bismuth alloy, samarium iron alloy and the like are melted; the alloys are prepared into irregularly-shaped magnetic powder through melt-spinning and airflow grinding; the irregularly-shaped magnetic powder is subjected to spray drying and the like so as to obtain spherical nanometer agglomerated powder; the spherical nanometer agglomerated powder is mixed with a binding agent and a processing agent uniformly; the mixture is conveyed into a hot extruding machine and extruded to form silks; a three-dimensional model is established by computer software according to the size and the shape of a product, and the product model is subjected to layered slicing; the three-dimensional model is lead into a 3D printer; the silks are conveyed into 3D printer and heated to soften, through an extruder and a movable spraying nozzle with a heating function, the material is extruded and deposited on a workbench which can be heated, and the extruded material is solidified on the workbench, accumulated and adhered layer by layer and magnetized during printing until the product is printed completely. The method for preparing the nano-crystalline anisotropic magnet by the 3D printing technique has the advantages that the prepared product is high in cost performance and processing performance, production period of the magnet can be shorted, and production cost of the magnet can be reduced.

Description

technical field [0001] The invention relates to a permanent magnetic alloy, in particular to a magnet for 3D printing, in particular to a method for preparing an anisotropic nanocrystalline magnet using 3D printing technology. Background technique [0002] One of the key technologies of 3D printing lies in the morphology and properties of the materials used. The printing material is generally a spherical powder, and the spheroidization rate of the powder is generally required to be greater than 98%. Only a high spheroidization rate can ensure that the printing powder is evenly and smoothly transported to the printing pool, so as to obtain a printed product with a dense structure and a low defect rate. At present, it is difficult to prepare high-end fine-grained spherical metal powder in China, and this powder depends on imports. [0003] Using low temperature, surfactant-assisted external magnetic field high-energy ball milling technology to prepare single-domain nano-magn...

AI Technical Summary

Problems solved by technology

[0005] The existing technology requires corresponding molds to prepare magnets, and it takes a certain amount of time and cost to make molds. After the product is demoulded, subsequent processing is required, and there is a certain processing cost.