The refractoriness of high alumina refractory bricks is relatively high among aluminum silicate refractory materials. With the increase of the content of AL2O3 in the product, the refractoriness increases, generally not lower than 1750～1790℃. For example, corundum products with AL2O3 content greater than 95% can have a refractoriness as high as 1900～2000℃.
The refire line change of high alumina refractory bricks depends on the firing degree of the product. If the firing temperature is sufficient and the firing is sufficient, the volume will be stable and the refire line will change little. On the contrary, due to recrystallization inside the product, residual shrinkage will occur.
The load softening temperature of high alumina refractory bricks decreases as the content of SiO2 and metal oxides in the product increases. Generally, the load softening temperature of high alumina bricks is 1420-1530°C. The corundum products with AL2O3 content greater than 95% have a load softening temperature of over 1600°C.
In the traditional refractory industry, the production processes of high alumina bricks and multi-clinker clay bricks are relatively similar. The main difference lies in the proportion of clinker in the ingredients. The proportion of clinker in the former is as high as 90-95%. The clinker is sorted and sieved to remove iron before crushing, and the firing temperature is relatively high.
The refractoriness of high alumina bricks is higher than that of clay bricks and semi-silica bricks, reaching 1750~1790℃, which is a refractory material.
