| abstract |
FIELD: chemistry. n SUBSTANCE: invention relates to sintered articles made from zircon and zirconium dioxide for use in a glass-melting furnace, particularly in articles used as supporting blocks for electrodes, or in an electrolysis cell in contact with molten cryolite. The initial load for producing the articles contains 5-50% zircon and has the average chemical composition given below, in wt % based on oxides with sum total of 100%: silicon dioxide SiO 2 and zirconium dioxide, where content of zirconium dioxide ZrO 2 is at least 75%, 0.2-6% dopant selected from Nb 2 O 5 , Ta 2 O 5 and mixtures thereof, possibly a stabiliser selected from Y 2 O 3 , MgO, CaO, CeO 2 and mixtures thereof in amount of 6% or less, 'other oxides' in amount of 6.7% or less. Components are formed from the initial charge and then sintered to obtain articles. n EFFECT: obtaining articles having high electrical resistance at temperatures of up to 1500°C and good resistance to corrosion caused by molten glass. n 27 cl, 1 tbl, 32 ex, 1 dwg |