Fused Cast AZS blocks are the most widely used materials both in glass contact and superstructure of glass melting furnaces. Fused cast AZS block is abbreviated as AZS because it contains Al2O3－ZrO2－SiO2. Fused cast AZS blocks are used in glass furnace both in the superstructure and in glass contact due to the very high glass and vapour resistance.
Fused cast AZS blocks began to be used in glass furnace applications for the glass contact and superstructure in the middle of the last century. They are intrinsically superior to the silico-alumina sintered materials, and extend the furnace campaign life.
Fused cast AZS blocks are made from pure alumina powder and Zircon sand (composed of 65% zirconia and 34% SiO2) through special casting process. The term Fused Cast refers to a manufacturing process in which the ceramic bonding is obtained by the solidification of a mixture which has been melted in an electric furnace and cast in liquid state into molds. After Alumina powder and zircon sand melting in electric furnace, they are cast into various molds and cool themselves down to become white solid.
Fused cast AZS blocks are characterized by high mechanical strength, excellent thermal shock resistance, resistance to corrosion by alkaline compounds, low creep at high temperature and a very low porosity (close to zero).
Based on the zirconia content which basically defines their corrosion resistance, fused cast AZS blocks can be divided into three types:
Fused Cast AZS—33#
Fused Cast AZS—33# contains 33% ZrO2. It has dense micro structure which ensures its great resistance in glass liquid. A variety of formats and shapes of Fused Cast AZS—33# are available for furnace different working areas. It is widely applied to glass furnace for superstructure, working-end side wall, paving tiles, feeder channels, tank bottoms, C-shaped block and doghouse crown, etc.
Fused Cast AZS—36#
Fused Cast AZS—36# contains 36% ZrO2. With its improved corrosion resistance and combined with the "reinforced filling" process, the optimum choice for side walls of flame furnaces with embedded melter bottoms, superstructures, front wall, back wall, top crown, doghouses, throat, bottom budding, Dam blocks, and electric block corners in glass melting furnace.. This type is only available for straight brick.
Fused Cast AZS—41#
Fused Cast AZS—41# contains 41% ZrO2. It is available in a large size straight or approximate bricks and special formats and shapes which are available for special machining processes. With the highest corrosion resistance within the AZS family, this type of material is used for all demanding glass contact applications in the void free configuration: electric block corners, Dam blocks, submerged walls, doghouses, throats, bottom budding, and in some cases melter sidewalls in the specific "reinforced filling" version (RR-EVF).
Zhengzhou Sunrise Refractory Co., Ltd. offers a wide range of refractories of high quality at affordable price for glass industry. The TY-AZS series of Sunrise Fused Cast AZS blocks are made of artificial synthesis high purity raw materials through special casting process, specially designed refractory for glass furnace application. Visit our official site https://www.sunriserefractory.com/ to learn more.