IMPROVED MONOBLOCK ONE-PIECE POURING STOPPER

摘要

A method of manufacturing a one-piece monoblock pouring stopper (1) comprises charging a mould with a refractory material (1) and a bonding agent to a level short of the full capacity of the mould and filling the remaining volume with a higher refractory material (2) selected from calcined alumina, fused alumina, magnesite and zirconia, together with a bonding agent such as foundry resin, compressing the contents of the mould, preferably by isostatic pressing, firing the compressed contents to form a monolithic structure and shaping monolithic structure to form a one-piece monoblock stopper.