Features of structure formation with zone melting of powder boron-containing refractory materials

The connection between zone melting production parameters and structure formation of a porous billet with a moving impurity solvent under conditions of a large temperature gradient and continuous heating is established by experiment. Basic specifications for the impurity solvent are formulated. It is shown that during zone melting the impurity solvent added to the original refractory material powder moves in a temperature gradient field through pores of the sintered skeleton activating compaction and recrystallization processes of the original billet at the level of individual particles and with slow rates of molten front movement without entering the molten zone. This makes it possible to combine the operations of preparing highly dense billets and zone melting.