Experimental Study on the Chemical Stability of Phosphate-Bonded Al2O3-Based Ceramic Foam Filters (CFFs)

Abstract Production of high-quality aluminum products requires an extensive melt treatment process, even more so with the increasing focus on recycling and sustainability. Filtration is a commonly used process segment for removal non-metallic inclusions in aluminum, ceramic foam filters (CFFs) are often as filtration media. In present study, chemical stability phosphate-bonded Al 2 O 3 -based CFFs has been investigated. Three different compositions have submerged into pure (with traces Mg) aluminum-magnesium (~ wt pct at 730 °C. addition to filter characterization before after exposure molten metal, using various imaging X-ray techniques, itself was analyzed by spark optical emission spectroscopy. The generation phosphine gas also measured use Dräger tubes, thermodynamic calculations performed FactSage™. were observed react magnesium very low concentrations (0.00035 pct), concentration increased severity degradation became evident. time proved detrimental effect structure, pieces struts broken off causing contamination. Severe resulted color changes accompanying diffusion phosphorus from filter, respectively. Moreover, released amounts exceeding recommended limits when came contact humidity air testing. Good agreement established exist between results experimental results.