CASTING PART COMPRISING AN EXTERNAL LAYER APPROPRIATE TO FORM A GAS IMPERVIOUS LAYER, AND IMPLEMENTATION PROCESS

摘要

The invention relates to a part for the casting of steel, said part comprising a body (2) made of carbon-containing refractory material. The part has a layer (10) which coats partially or completely the body and is appropriate to form a gas impervious layer (10a) which is oxydised and densified when brought to a temperature higher than 1000 DEG C. The layer (10) is comprised of a refractory material having sintering precursors selected in the group comprising calcined alumina, reactive calcined alumina, silica fumes, clays.