A New Porous Mullite Nozzle for Refining Molten Aluminum

Abstract

A new porous nozzles for refining molten aluminum were made from mullite，graphite powder, red mud and sodium silicate. The relationships between graphite content and permeability, sintering parameters and permeability, graphite content and compressive strength were investigated, respectively. The internal structures of the nozzle before and after sintering were observed by SEM. The experimental results show that the permeability of sample can be improved by sintering at temperature of 1000°C for 2 hours. As graphite content increases, the permeability of sample increases, yet the ultimate compressive strength decreases. The compressive strength can be enhanced by using combination of different sizes of mullite particles.

The Purification of ZL114A Alloy by Means of Bubble Floatation

“…One of the reasons was that the inclusions in the melt were not distributed uniformly. The hydrogen content in the aluminum melt has something to do with the inclusions according to the study [11,12]. The hydrogen was entrapped by the inclusions and lived on the surface of inclusions.…”