PRODUCTION OF MODIFIER FOR ALUMINIUM ALLOYS Russian patent published in 2014 - IPC B22F3/20 C22C1/03 B82Y40/00 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises mixing of carrier powder with superfine modifying powder in planetary-type mill and compaction of obtained composition. Said superfine modifying powder represents the composition of powders of silicon carbide (SiC) - 50÷70%, silicon nitride (Si₃N₄) - 20÷30%, sodium hexafluoraluminate (Na₃AlF₆) - 10÷20% produced by azide process of self-propagating high-temperature synthesis with particle size of 70-100 nm Note here that silicon carbide features β-modification. Said superfine modifying powder carrier represents the copper powder with particle size not over 180 mcm at copper-to-superfine powder ratio of 9:1.

EFFECT: application of modifier of aluminium alloys allows making of dendrites 2,4 time smaller to up the alloy mechanical properties.

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