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

The connection between zone melting production parameters and structure for mation of a porous billet with a moving impurity solvent under conditions o f a large temperature gradient and continuous heating is established by exp eriment. Basic specifications for the impurity solvent are formulated. It i s shown that during zone melting the impurity solvent added to the original refractory material powder moves in a temperature gradient field through p ores of the sintered skeleton activating compaction and recrystallization p rocesses of the original billet at the level of individual particles and wi th slow rates of molten front movement without entering the molten zone. Th is makes it possible to combine the operations of preparing highly dense bi llets and zone melting.