Customers in Israel ordered 13 tons of high alumina bricks
In Aug. 13 tons high aluminum bricks are packed for delivering to our customer in Israel. Topower Refractory as an manufacturer of refractory materials can product good quality high alumina bricks，if you need it please contact us.
High alumina bricks are aluminum silicate refractories with Al2O3 above 48%. Because of the high alumina content, it is called high alumina refractory.
It can also be classified according to the content of Al2O3, such as: Al2O3>75% for first-grade high-alumina bricks; Al2O3 for second-grade high-alumina bricks is 65%~70%, and Al2O3 for third-grade high-alumina bricks is 55%~60%.
Performance of high alumina bricks
1. High refractoriness Because the refractoriness is generally 1750~1790℃.
2. The softening temperature under load is high, generally 1400-1520℃.
Due to the low content of impurities, the softening point under load is high; the high-temperature performance of high-alumina bricks is related to the microstructure of the material. The high temperature resistance of the matrix part is much lower than that of the particle part, and the slag first erodes the matrix part during use. Therefore, it is possible to improve the high temperature service performance of the material by improving the matrix portion and structure of the adjustment material.
3. Good slag resistance
The content of Al2O3 in high alumina bricks is high, which is close to neutral materials. The slag resistance of high-alumina materials increases with the increase of Al2O3 content, but its corrosion resistance to basic slag is lower than that of basic refractory materials, and the reduction of impurity content is beneficial to improve slag resistance. At the same time, increasing the density of the material and reducing the porosity are also effective measures to improve its slag resistance.
Good thermal stability
The expansion coefficient of brick is small. The thermal shock resistance of high alumina bricks is worse than that of clay bricks, which is closely related to the mineral composition of the material. The first and second grade high alumina bricks are worse than the third grade high alumina bricks. In production, the thermal shock resistance of the material is often improved by improving the particle structure characteristics of the material or adding a certain amount of synthetic cordierite (2MgO·2Al2O3·SiO2) and other minerals to the ingredients.
Development of high alumina bricks
In recent years, many refractory research and production units have done a lot of work on the development of high-alumina bricks, improving the performance of high-alumina bricks by adding other minerals or chemical components; using synthesis or electrofusion to improve the high-temperature crystal phase of high-alumina bricks The composition and high temperature properties of high-alumina bricks have achieved effects, thereby expanding the application field of high-alumina bricks.
