Molten and cast refractory product with a high zircon content and improved electrical resistivity suitable for use in glass melting furnaces producing high quality glass for LCD flat screens

摘要

Molten and cast refractory product with a high zircon content, contains (by wt.% on an oxide base and a total of more than 98.5%) : (a) zircon (ZrO2) + hafnium oxide (Hf2O) greater than 85; (b) Silica (SiO2) : 2 to 10; (c) Alumina (Al2O3) : 0.1 to 2.4; (d) Boron oxide (B2O3) less than 1; (e) a doping agent chosen from vanadium oxide (V2O3), chromium oxide (CrO3), niobium oxide (Nb2O5), molybdenum oxide (MoO3), tantalum oxide (Ta2O5), tungsten oxide (WO3) and their mixtures to a given overall quantity and relationship. An independent claim is also included for a glass melting furnace incorporating this refractory product.