Ring-shaped inserts for sliding gate plates and corresponding sliding gate plates

摘要

An annular insert, based on MgO-C contains: (a) 75-90 wt.% matrix material having a grain size of less than 7 mm which is made from made of an MgO sinter, a MgO spinel or a MgO causter; (b) 2-15 wt.% zirconium mullite having a grain size of 0.1-5 mm; (c) 1-5 wt.% carbon; and (d) 1-5 wt.% of an additive which limits the oxidation of the carbon.