High Alumina Brick Performance and Types

High alumina brick is a kind of firebrick, high aluminum brick is one of the high level refractory materials, and thermal conductivity, thermal shock resistance and slag resistance are better. The kind of high aluminium brick is very much, commonly used have common high aluminium brick, high load soft high aluminium brick, low creep high aluminium brick, phosphate high aluminium brick and so on, the following details for you to introduce.

The refractory of high alumina brick is higher than that of clay brick and semisilicate brick. The refractory material are mainly influenced by the content of Al2O3 and the type and quantity of Al2O3. The refractories increase with the content of Al2O3. Because Al2O3 in high aluminum products is high, less miscellaneous mass, forming less fusible vitreous body, so the softening temperature under load is higher than that of clay bricks, but because mullite crystals do not form reticular structure, so the softening temperature under load is still not as high as that of silicon bricks. High aluminum brick has better thermal conductivity than clay brick. The reason is that the glass with low thermal conductivity in the high aluminum products is less, while the mullite and jadeite crystals with good thermal conductivity are increased, which improves the thermal conductivity of the products.

Its thermal shock resistance is between that of clay and siliceous products. The water cooling cycle at 850℃ was only 35 times. This is mainly due to the higher thermal expansion of corundum than mullite and the absence of crystal transformation. At present, the thermal shock resistance and stability of the products can be improved by improving the particle structure, reducing the content of fine powder and increasing the critical particle size and particle size distribution of clinker. High aluminum brick Al2O3 more, close to neutral refractory material, can resist acid slag and alkaline slag erosion, because it contains SiO2, so the ability of alkali slag than acid slag capacity is weak. In addition, the slag resistance of high aluminum products is related to the stability of the products in slag. Generally speaking, after high pressure molding and high temperature sintering, products with lower porosity have higher slag resistance.

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