3D printing method for ceramic material

Abstract

The invention provides a 3D printing method for a ceramic material. The 3D printing method comprises the following steps: A) distributing a material with high dielectric loss into the powder of a material with low dielectric loss so as to form a printing body; and B) placing the printing body obtained in the step A) in a microwave electromagnetic field for curing and sintering of the printing body. The 3D printing method provided by the invention is based on the characteristics of selective heating and integral heating of electromagnetic waves; when a supporting structure totally wraps the printing body, selective heating, curing and sintering of a printing area are realized, and structural uniformity is improved; meanwhile, outfield auxiliary effect can promote mass transfer process, so rapid densification of the ceramic material is realized; and a microstructure different from the microstructures of conventional sintering products can be obtained while the macrostructure of the shape of the ceramic material is designed, controllable manufacturing of organizational structures of different sizes can be realized, and thus, structure-function integrated designing and manufacturing of the ceramic material is realized. The 3D printing method has the characteristics of simple raw material treatment and low printing cost and has the potential of industrial application.

Description

technical field [0001] The invention relates to the technical fields of material science and manufacturing engineering, and in particular to a 3D printing method for ceramic materials, which can realize the integrated design and manufacture of the ceramic material's macrostructure and microstructure. Background technique [0002] One of the important research directions of advanced ceramic materials is the materials with integrated structure and function and the corresponding advanced preparation technology. Carrying out the joint design and research of "composition-process-structure-performance" of advanced ceramic materials, reducing manufacturing costs and improving material quality will generate huge scientific and economic value. [0003] Forming and sintering are the key steps in the preparation of high-performance ceramics. They affect the macroscopic and microscopic structures of the material respectively, and then determine the performance of the product. The emerg...

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Problems solved by technology

[0006] The low density and uneven structure are firstly due to the printing method itself. The extensive use of binders and the layer-by-layer bonding process will bring problems in the pores and interfaces of the formed body; secondly, the sintering process, which is obtained through 3D printing. The complex shape of the conventional sintering process will further aggravate the inhomogeneity of the structure due to problems such as anisotropic shrinkage and internal and external temperature gradients.

[0007] (2) The process is complicated, and post-processing technology is required to improve product quality

[0009] (3) The cost of macro molding is high and the efficiency is low

[0010] Although the organic precursor-stereolithography technology can significantly improve the performance of the product, it still has the problems of high cost and low efficiency

Most of the organic precursors or light-curing raw materials are expensive, and have relatively harsh use and storage conditions; in addition, this 3D printing method is slow in process, low in efficiency, and low in product yield, so the cost performance is extremely low, and it does not have The basis for large-scale, commercial production

[0011] (4) It is difficult to realize the one-time design and manufacture of the macro-microstructure of the product

[0012] Most of the existing 3D printing methods can only realize the design and manufacture of product structure at the macro scale due to the limitation of printing accuracy.

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