Title :
Electrical conduction of selected refractories
Author_Institution :
Corning Inc., NY, USA
Abstract :
The author details the laboratory testing of electrical conduction in selected refractories used in the construction of electrically boosted glass tank-furnaces. Fused-cast AZS (40% zirconia), a typical electrode block, does conduct to failure under appropriate conditions of temperature and voltage. Bonded AZS (28.5% zirconia) does conduct on a controlled basis. Sillimanite, bonded dense zircon, bonded AZS (21% zirconia), and high resistance fused-cast AZS do not conduct. The author recommends elimination of fused-cast AZS materials from tanks with bottom electrodes and the use of bonded AZS (21% zirconia) or bonded dense zircon in their place. The development of high-resistance fused-cast AZS refractory for the market place is strongly recommended.<>
Keywords :
electric furnaces; electric heating; electrical conductivity of crystalline semiconductors and insulators; electrodes; glass industry; refractories; zirconium compounds; bottom electrodes; electric furnaces; electric heating; electrical conduction; electrically boosted glass tank-furnaces; fused-cast AZS; high resistance; refractories; Bonding; Conducting materials; Cooling; Electrodes; Furnaces; Glass; Laboratories; Land surface temperature; Materials testing; Temperature sensors;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96826
