LOWER NOZZLE FOR ALUMINA-CARBON-BASE SLIDING GATE

摘要

PURPOSE:To make it possible to obtain a sufficient effect without embrittlement of a structure according to oxidation of carbon by abrupt thermal impact and air inflow and generation of wear by molten steel flow. CONSTITUTION:This lower nozzle brick for an alumina-carbon-base sliding gate is obtd. by adding a boron modified resin contg. 10 to 50wt.% B at 0.5 to 10wt.% as a binder to the lower nozzle brick and subjecting the mixture to stages including kneading, molding, drying and calcining. The resulted lower nozzle brick has high oxidation resistance. The oxidation resistance and the service life are improved by adding the boron modified phenolic resin.