Foaming device and method for a porous magnesium alloy

Abstract

The present invention provides a porous magnesium alloy foaming device, comprising: a melting furnace; a furnace cover arranged on the top of the melting furnace, the furnace cover is provided with a first through hole and a second through hole; A pipetting spoon with a through hole; a foaming mold fixed in the second through hole, the foaming mold is suspended inside the melting furnace; a stirrer arranged in the foaming mold. The foaming device provided by the invention can realize foaming in a short process, saves the addition of tackifier and heat preservation and foaming, and does not stir for a long time in a semi-solid state. On the one hand, it will not change the existing alloy composition, and has little impact on product performance. On the other hand, the foaming process is suitable for most magnesium alloys and has good formability. On the other hand, the foaming time is shortened and the foaming efficiency is improved; and the structure design of the melting furnace and the foaming mold can make the foaming agent decompose. The speed matches the cooling and viscosity increasing speed of the magnesium alloy liquid, so as to prevent the precipitated bubbles from aggregating and overflowing, and the obtained porous magnesium alloy has a small and uniform pore size.

Description

Technical field [0001] The invention relates to the technical field of preparation of porous metal materials, and more specifically, to a foaming device and method for porous magnesium alloys. Background technique [0002] The melt foaming method is a relatively common method for preparing porous alloys. Compared with porous aluminum alloys, the preparation of porous magnesium alloys by this method started late and the process is not yet mature. The foaming process of porous magnesium alloy usually uses carbonate (CaCO 3 , MgCO 3 Or magnesite powder) as a melt foaming agent, in order to prevent the rapid escape of generated gas and the merger and growth of bubbles, it is necessary to increase the viscosity of the melt. Generally, the method of adding a tackifier to the melt, such as Ca Or SiC and other particles. At the same time, in order to make the blowing agent evenly distributed in the melt, it is necessary to stir the alloy liquid, and then let it stand for a period of ti...

AI Technical Summary

Problems solved by technology

[0006] However, the foaming process of porous magnesium alloys in the prior art requires the addition of tackifiers, thereby changing the composition of the existing alloys and adversely affecting product performance; moreover, it needs to be stirred in a semi-solid state, and only a small amount of fluidity Good cast magnesium alloys are suitable for stirring in semi-solid state, but most magnesium alloys have a small semi-solid range, high temperature, difficult to control the stirring process, and poor formability; at the same time, heat preservation and foaming are required, which takes a long time and low efficiency

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