Method and device for preparing gradient material containing continuously changed components

Abstract

The invention discloses a method and a device for preparing a gradient material containing continuously changed components. The method comprises the following steps: controlling the rotation speed of a stepping motor by a computer control system according to designed gradient material components; driving an extrusion screw by virtue of the stepping motor so as to extrude two or more materials in a certain proportion from two or more charging hoppers at a preset speed; evenly mixing the extruded materials in a powder mixing device and piling gradient powder in a deposition mould; and carrying out cold-press molding and then sintering to obtain the gradient material containing continuously changed components. The method disclosed by the invention is simple and practicable and can be used for preparing the gradient material containing multiple components and any controllable structure without any dispersing agents.

Description

technical field [0001] The invention relates to a method and a device for preparing a gradient material with continuously changing components, more particularly to a method and a device for preparing a gradient material with continuously changing components by using a computer to control the extrusion speed of a screw. Background technique [0002] Gradient material is a new type of composite material developed in the 1980s. The composition and structure of gradient materials change continuously or quasi-continuously in the direction of material thickness or length, and their properties also change in gradients. Gradient materials use two (or more) materials with different properties. By continuously changing the composition and structure of the material, the interface disappears, so that the performance of the material changes slowly with the composition and structure of the material, forming a gradient functional material. . Compared with traditional composite materials,...

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Problems solved by technology

Obviously, this method can obtain the preset gradient distribution more accurately, and the preparation efficiency has also been improved. However, under the limited number of stacked layers, if the constituent layers cannot diffuse through the bonding interface, it is not enough to obtain continuous changes. The interface between the layers will also weaken the performance of the material, and it cannot be called a continuous gradient functional material in a strict sense.

Moreover, its implementation process is complicated and there are many manufacturing processes. Only some products with simple shapes and specific shapes can be obtained. It is difficult to prepare products with complex shapes and continuous profiles. It is not suitable for the preparation of metal-based and ceramic-based gradient materials with high melting points.

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