Research of the boundaries of the "metal filter" section during filtration of magnesium alloy AZ91

Abstract

During the production of magnesium alloys, non-metallic inclusions of exogenous and endogenous nature accumulate in the liquid metal, which is associated with the high chemical activity of magnesium and alloying elements, as well as the use of fluxes. Therefore, the technology for producing magnesium-based alloys involves refining processes. The most progressive method of purifying liquid metal is considered to be the method of filtering it through granular solid filters, which allows for the simultaneous refining and modification of the alloy. The structure and quality of the AZ91 alloy in the zone of contact with filter materials, magnesite, graphite, limestone, was studied. It has been established that graphite and magnesite are the most suitable filtration materials for magnesium alloys. Filtering the AZ91 alloy through graphite and magnesite filters improves the quality of the metal, but the best characteristics are obtained on a sample of the alloy filtered through a complex filter.