Liquid phase laser three-dimensional printing system and method based on nanoparticles

Abstract

The invention relates to a liquid phase laser three-dimensional printing system and a liquid phase laser three-dimensional printing method based on nanoparticles. The system comprises a laser light source, a transmission control unit, a scanning focusing unit, a monitoring device, a liquid tank, a bearing substrate, an objective table, a moving table and a computer. The method comprises the following steps: establishing a geometrical model by utilizing computer drawing software, slicing and delaminating data, and planning a scanning path; putting liquid which contains to-be-printed nanoparticles into the liquid tank; adjusting the moving table, adjusting the upper surface of the bearing substrate placed on the objective table to a position which approaches the upper surface of the liquid in the liquid tank, so as to be positioned on the laser focusing plane after focusing; enabling the nanoparticles in the solution to move towards a laser focus by utilizing the action of laser tweezers, and generating fusion under the photothermal action, so as to form single-layer structures by virtue of laser scanning; lowering the objective table by the thickness of one single-layer structure, and scanning the other single-layer structure until the design structure is printed; taking out the printed structure, and cleaning residual nanoparticles on the surface of the structure.

Description

technical field [0001] The present invention relates to the technical field of 3D printing, in particular to a liquid-phase laser three-dimensional laser printing system and method based on nanoparticles Background technique [0002] The development towards miniaturization and functional integration is an important trend in the development of structures and devices. The reduction of structure and device scale and the integration of functions all depend on the improvement of processing resolution and precision. Conventional subtractive manufacturing technology is difficult for some small structures, especially complex small structures. In contrast, laser 3D printing technology is a flexible, simple and designable structural additive manufacturing method, which can realize the direct manufacture of any 3D structure. Selected area laser sintering and selected area laser melting are two high-precision laser 3D printing methods currently developed. However, at present, the pro...

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Problems solved by technology

However, at present, the processing resolution of these two methods can only reach about 40 μm (see P. Regenfuss et al., Rapid Prototyping Journal, 2007, 13, 204-212), and the surface of the processed structure is rough, and the internal bonding is not tight enough, so it is difficult to meet the complex and small three-dimensional Fabrication needs of the structure

Due to the increased adhesion, poor fluidity, and difficulty in powder spreading of small-scale powders, this limits the development of higher resolution and higher precision laser 3D printing technology

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