Preparation method of co-injection multi-layer structure part

Abstract

The invention discloses a preparation method of a co-injection multi-layer structure part. The preparation method of the co-injection multi-layer structure part comprises the following steps of respectively mixing and granulating powder A and powder B formed by mixing bonding powder B1 and strengthening powder B2 with a binder to obtain uniform feeds A and B; then sequentially injecting the two feeds into a mold cavity by utilizing a co-injection molding technology to obtain a product green body, and removing the binder in the green body through a degreasing process; and finally, carrying out co-sintering densification and annealing heat treatment so as to obtain the multi-layer structure part. The preparation method of the co-injection multi-layer structure part provided by the invention has the advantages of being free of component limitation, high in interface bonding strength, simple in process, suitable for large-scale production and the like, is beneficial to improving the comprehensive performance of parts, solves the problems of large component limitation, low interface strength, complex process, high cost and the like in the prior art, and is very suitable for preparing multi-layer structure parts.

Description

technical field [0001] The invention belongs to the field of powder co-injection molding, in particular to a preparation method of co-injection multilayer structure parts. Background technique [0002] With the continuous development of science and technology, higher requirements are put forward for the performance of materials. When manufacturing certain parts, it is required to have high strength, hardness, high toughness, plasticity, and even good corrosion resistance. It is difficult to prepare materials with good comprehensive properties by traditional technology. The main solution is to manufacture multi-layer composite structural materials, which not only maintain the advantages of the properties of each component material, but also obtain a single composition through the complementarity and correlation of the properties of each component. The comprehensive performance that the material cannot achieve. There are many preparation processes for composite materials, suc...

AI Technical Summary

Problems solved by technology

It is difficult to prepare materials with good comprehensive properties by traditional technology. The main solution is to manufacture multi-layer composite structural materials, which not only maintain the advantages of the properties of each component material, but also obtain a single composition through the complementarity and correlation of the properties of each component. Comprehensive performance that cannot be achieved by materials

There are many preparation processes for composite materials, such as chemical vapor deposition (CVD), physical vapor deposition (PVD), laser cladding, thermal spraying, self-propagating high-temperature synthesis, sol-gel technology, etc., but these processes are different. To a certain extent, there are the following disadvantages: the surface thickness of the composite structure is thin and the bonding strength with the substrate is low, the equipment investment is large, the process is complicated, and the cost is high.

However, this method involves co-injection of three layers of materials, and the preparation process is complicated, which is not conducive to mass production, and the bonding strength of the reported interface does not exceed 400MPa

Therefore, it is difficult to obtain multi-layer composite structural parts with the advantages of large composition difference, high interface bonding strength, high surface hardness, simple process, and easy large-scale production by applying the existing technology.

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