Refractory materials of non-stabilized fused zirconium dioxide, refractory materials of partially or fully stabilized fused zirconium dioxide; process for the production of non-stabilized, or partially or fully stabilized fused zirconium dioxide refractory materials and refractory products.

摘要

Fused zirconia refractory materials have less content of SiO2, high particle strength and hardness and advantageously less content of radioactive elements, particularly non-stabilized, partially or fully stabilized fused zirconia refractory materials obtained from desilicated zirconia derived from zircon. The refractory materials have 0.01 to 0.5 wt. % SiO2, a crystal size of larger than 50 mu m, particle strength of 30 kgf, hardness of at least 10 GPa and preferably have a total amount of U and Th being below 1,000 ppm. Refractory products using said materials as well as methods for producing said materials by an electrofusion process are described.