(1) Fire resistance. High alumina brick products are high-quality products among silicate aluminum refractory materials, and their refractoriness increases with the increase of Al2O3 content, generally not lower than 1750-1790 ℃. Corundum bricks with Al2O3 content greater than 95% can have a refractoriness of up to 1900-2000 ℃.
(2) Load softening temperature. The load softening temperature of high alumina brick products decreases with the increase of silicon dioxide and alkali metal oxide content, but is higher than that of clay brick products, about 1420-1530 ℃. Al2O3. Corundum bricks with a content greater than 95% have a load softening temperature of over 1600 ℃.
(3) Slag resistance. Due to the neutral and high content of alumina in high alumina brick products, these materials have strong resistance to the erosion of acidic and alkaline slag.
(4) Thermal shock stability. In high alumina brick products, two types of crystals, corundum and mullite, coexist. Because the thermal expansion coefficient of corundum is larger than that of mullite, stress concentration occurs due to the difference in expansion when the temperature of refractory bricks changes. So, the thermal shock stability of high alumina brick products is worse than that of clay brick products, with a typical water cooling frequency of only 3-5 times.
(5) Reburning line changes. If the firing temperature of high alumina brick products is sufficient and the firing time is sufficient, the volume will be stable and the variation of the re firing line will be small; On the contrary, residual shrinkage such as that of clay brick products will occur, which is also caused by recrystallization.
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