The Investigation of Fabrication Processing for Lotus-type Porous Magnesium by the In-situ Reaction and Unidirectional Solidification Method

In this paper, a novel safe and high-efficient fabrication processing named in-situ reaction and unidirectional solidification method was presented for lotus-type porous metals. The fabrication process of lotus-type porous magnesium by the in-situ reaction method had been investigated, and the rule of effect of processing parameters on pore structure and porosity was analyzed. The results showed that the porosity of the samples fabricated under different processes conditions had a wide range from 2.4 percent to 54.2 percent. The content of water, the addition of powder, the solidification rate, and casting temperature all had significant effect on the porosity and pore structure. The porosity of the samples increased with increase of the content of water, addition of powder or the solidification rate. But increasing the casting temperature would make the porosity of samples first increase then decrease. The pore in sample fabricated by in-situ reaction and unidirectional solidification method was round and regular, pore wall was very smooth, distribution of pore size was relatively uniform, and the pore growth direction was parallel to solidification.