Benefits of Fused Cast alpha beta Brick for Glass Kiln
Fused cast α-β corundum brick, α-β corundum brick for glass kiln is a fused refractory material commonly used in glass furnaces such as light industry, building materials, and electronics. It has more excellent performance on resistant to glass erosion, foaming, and stones than other refractory materials, In particular, it hardly pollutes the molten glass, so it is a high-quality refractory material for the glass forming parts such as the clarification zone, the melting pool, the flow channel, and the forehearth.
Different Types of α-β bricks
1. ZM-A (α-alumina)
The fused refractory material composed of more than 90% α-alumina has excellent high temperature stability. The structure is the most compact, solid, high hardness, and has excellent resistance to slag erosion and wear resistance. It is used as lining brick for firing with high temperature kiln, lining brick for graphite baking furnace, etc.
2. ZM-G (α-β alumina)
It is composed of about 50% of α-alumina and β-alumina, and the two crystals are interlaced to form a very dense structure, which is excellent in strong alkali resistance and slow corrosion. The corrosion resistance at high temperature (above 1350°C) is inferior to that of AZS, but in the lower temperature range, its corrosion resistance against molten glass is comparable to that of AZS. Because it does not contain impurities such as Fe2O3 and TiO2, the matrix glass phase is very small, and it has the advantage of less foreign matter such as bubbles when it contacts with molten glass, so that it does not pollute the matrix glass. Therefore, it is used as a furnace material in the low temperature part (clarification tank, forehearth) near the glass outflow port of the glass melting furnace.
3. ZM-U (β-alumina)
Composed of β-alumina, it has a large plate-shaped β-alumina knot structure, and its knots are interlaced and thick. The porosity is also large and the strength is low in fused refractory materials. But on the other hand, it has good spalling resistance, especially shows extremely high corrosion resistance to strong alkali vapor, so it is used in the superstructure of glass melting furnaces. However, when heated in an atmosphere with low alkali content, β-alumina is easy to decompose and cause volume shrinkage to cause cracks and cracks when it reacts with SiO2 after contacting it.
Fused cast α-β corundum bricks, The formation of β-Al2O3 is closely related to the content of strong alkali. When the content of Na2O is 5% or the content of K2O is 7%, all Alumina is converted to β type.