3D printing method and device for hierarchical porous material

Abstract

The invention discloses a 3D printing method and device for a hierarchical porous material. The patent is based on a brazil-nut effect, namely, particle mixtures in various sizes are placed in a container, an external force is applied to the container to oscillate the particle mixtures, particles with large sizes can float up while small particles can sink, and therefore, graded distribution in the height direction is implemented. On the basis of the effect, an oscillating device is added in a 3D printing process of a power bed. The 3D printing method comprises the following steps: before pavement of materials, orderly layering pore forming particles by oscillation according to sizes; after every layer of pore forming particles is paved, paving a corresponding layer of liquid photosensitive resin materials on the layer of pore forming particles; carrying out selective photocuring by using a digital mask technology; carrying out layer-by-layer stacking and curing molding; and removing the pore forming particles by aftertreatment technologies including heating or dissolving and the like to form the hierarchical porous material. The aperture size of the porous material obtained by the method is orderly changed in the layer thickness direction, gradient mechanical and acoustical properties can be generated, and the hierarchical porous material is used in fields of artificial biological tissue scaffolds, sound absorption materials, cushioning materials and the like.

Description

Technical field

[0001] The invention belongs to the field of rapid prototyping and digital manufacturing, and specifically relates to a 3D printing method and device for layered porous materials. Background technique

[0002] As a typical biological structural material, porous structural materials are commonly found in nature, such as trees, rocks, butterfly wings, bones and honeycombs. The porous structure reduces the weight of the structure, and at the same time exerts irreplaceable load-bearing and multifunctional characteristics. For example, the porous structure of the butterfly wing can effectively increase the light capture efficiency of the material, the porous structure of the bone can improve the strength and impact resistance of the bone, and the porous structure of the honeycomb allows the honeycomb to have natural sound absorption capabilities. Therefore, the porous structure has important research and application value in many fields such as aerospace, man-made sup...

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