Device and method for preparing functionally graded material based on Brazil nut effect

Abstract

The invention provides a functionally graded material preparation device and method based on the Brazilian nut effect, the device comprises a working chamber, a powder mixing control device, a powder spreading device and a material forming device, the powder mixing control device is used for mixing powder and generating vibration, the Brazilian nut effect appears on the powder, gradient layering of the powder is achieved, and the material forming device is used for forming a material. The layered powder is conveyed into the working chamber layer by layer; the powder laying device is used for laying the powder on the upper layer in a printing area in the working chamber, and after the laid powder is printed, the next layer of powder is laid; the material forming device combines the steps of melting, printing and powder laying on a powder bed in a printing area through a laser, a layer of powder is laid, then a layer of powder is printed, and finally the functionally graded material is obtained. According to the method, the advantages of the selective laser melting technology are brought into full play, the gradient height continuous material can be directly manufactured, and efficient and high-quality preparation of the functionally graded material is achieved.

Description

technical field [0001] The present invention relates to the fields of functionally graded material preparation, metal additive manufacturing technology, etc., specifically, a functionally graded material preparation device based on the Brazil nut effect and a preparation method thereof. Background technique [0002] In recent years, with the development of additive manufacturing technology, functionally graded material parts prepared by additive manufacturing technology have gradually attracted widespread attention in the aviation and medical industries. Additive manufacturing technology is a manufacturing technology that gradually accumulates materials into the desired shape. It has the advantages of saving materials, fast processing speed, and supporting the processing of parts with complex shapes. Among many additive manufacturing technologies, because laser metal deposition (LMD) technology can realize the continuous ratio change of powder components in the manufacturing...

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Problems solved by technology

This method not only cannot produce functionally graded materials in the traditional sense, but also cannot avoid problems such as powder oxidation during the manufacturing process and excessive exposure of operators to harmful powders.

The results show that under this powder coating method, the selective laser melting technology cannot exert its ability to process large-sized and complex-shaped parts with high precision when preparing functionally graded materials.

Moreover, when the SLM technology using this powder spreading method is used to prepare gradient functional materials, although the composition of the powder material is easy to control, because the proportion of each component in the mixed powder must be pre-designed and fully mixed, it cannot be adjusted in real time, so it is difficult to achieve Continuous and uniform change of internal composition in functionally graded materials

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