How can we inject Mg powder into molten Al in compo-casting method?

01 January 2014 1 418 Report

I'm working on MMCs with Al2O3 reinforcing particles in Al matrix. In articles it is mentioned that for better wettability of Al2O3 with molten Al it's effective to add Mg powder. How can I avoid attaching powders at the nozzle tip which can block injection of powder?

Priyavrat Thareja

Are you adding Al2O3 particles or it is result of selective oxidation of melt?

Mg is pyrophoric and calls for safety - thus attaching of powders at the nozzle tip is a complimenration of its nature,

sure heat at nozzle tip can block injection of powder? so possible measures are:

Avoid heat accumulation at tip

Reduce wettability with and seek shear at tip

Let the tip get cleared off with heat.

More options/ variations can be explored. We can have lengthy discussion at appropriate time.

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