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Topic: Features, Classifications and Applications of Fused Cast Refractories
Fused cast refractories are materials that are produced by melting the raw material of the desired composition and then casting molten refractories in molds. They are widely known for having high corrosion resistance which are entirely different in the crystalline structure and the process for their preparation from fired or unfired bonded refractories due to closed pores.

Fused cast refractories are manufactured by melting mixtures of raw materials in an electric furnace at a temperature exceeding 2000°C. Then cast the melt into molds of prescribed shapes. Finally cool and solidify them under thermal insulation in many cases. High density, small or large shapes are obtained. When appropriate, a finish work of drilling or cutting(to get different shapes) is made by grinding with diamond tools.

The dense crystalline structure provides the fused cast bricks with superb strength, corrosion and erosion resistance at very high temperatures. They are quite stable against aggressive melts such as glass and molten metal oxides, but their thermal stability is usually not very high. Fused cast refractories always have a very low and closed porosity but contains voids.

Fused cast refractories are the preferred refractories in contact with glass melts, due to the chemical stability, impermeability, and resistance to corrosion and erosion at the working temperatures in the glass melting furnaces. Therefore, used cast refractories are widely used in the glass industry as a lining for glass melting furnaces. They are also used in various other industries such as iron & steel, aluminum, petrochemistry industries.

Fusion cast refractories are normally formed from alumina usually along with zirconia and silica. Proportions of other minerals such as calcia, chromia and magnesia may be added to control the crystalline structure and physical properties of the end products. Based on the mineralogical composition, fused cast refractories can be divided into:

Fused Cast AZS Block

Fused cast AZS block is abbreviated as AZS because it contains Al2O3-ZrO2-SiO2. Based on the zirconia content which basically defines their corrosion resistance, fused cast AZS blocks can be divided into Fused Cast AZS—33# (33% ZrO2), Fused Cast AZS—36# (36% ZrO2) and Fused Cast AZS—41# (41% ZrO2). The corrosion resistance increases with growing ZrO2 content. They are the most widely used materials both in glass contact and superstructure of glass melting furnaces due to the very high glass and vapor resistance.

Fused Cast Alumina Block

Fuse cast alumina block contains over 90% Al2O3 and are a kind of pure alumina block which has excellent resistance against acid slag and chemical corrosion. Thanks to their high purity, they are perfect complements to the AZS blocks for sensitive applications. According to the crystallographic analysis, Fuse cast alumina block can be divided into alpha Fuse cast alumina block (almost 100% alpha alumina crystal), beta Fuse cast alumina block (almost 100% beta alumina crystal) and alpha-beta Fuse cast alumina block (approximately 50% alpha and 50% beta respectively). Its neutrality against alkali vapors makes it the best choice for the downstream part of superstructures in demanding applications.

Fused Cast High Zirconia Block

The Fused Cast high zirconia block contains at least 80% of ZrO2 with particularly excellent corrosion resistance against molten glass and low contamination properties. Therefore, it has been widely employed as refractory materials in contact with molten glass in a glass melting furnace.

Fused Cast Skid Rail Block

Fused cast skid rail blocks are mainly made from alumina and zirconia. They are of various types including steel discharging platform brick,skid rail block and iron discharging tank blocks. They feature great strength,good wear and fused slag corrosion resistance as well as long service life. It is mainly used in areas that require high abrasion and temperature

by guest Mon Jul 20 07:53:56 UTC 2015
 
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