PRODUCTION OF NOZZLE FOR CASTING

摘要

PURPOSE:To extend the life of a casting nozzle having high corrosion resistance and strength by sticking a refractory slurry by a drain casting method to the inside wall surface of said nozzle to a prescribed thickness thereby providing spalling resistance to the inside wall surface and adding also an effect of shielding heat thereto. CONSTITUTION:The hydrated refractory slurry consisting essentially of the pulverous powder of alumina or silica is filled in the calcined nozzle for casting consisting of the high corrosion-resistant and high-strength material such as high alumina, high alumina carbon or high zirconia carbon and is drained after the specified time to form the sticking layer of the prescribed thickness on the inside surface of the nozzle. The layer is thereafter dried or calcined. The fire resistance and spalling resistance which are the disadvantages of the above- mentioned nozzle material are improved and the effect of heat insulation is added by the gaps between the inside wall surface and the slurry, by which the nozzle life is extended.