Introduction of high temperature performance of alkaline refractory bricks

Alkali refractory bricks have a refractoriness of more than 2000 ° C, higher than other refractory bricks. Load softening temperature, high temperature flexural strength, high temperature volume stability and high temperature compression creep property of each alkaline refractory brick increase with density and impurity content of brick making materials.

Optimized for reduction and firing temperature increase. Ordinary alkaline products have a load softening temperature of 1550 ~ 1600 ° C; high-grade products: such as mirror dolomite brick, floor spinel brick, high-purity mirror brick, direct combined mirror lead brick, etc. at 1700 ° C or above: semi-recombination, re-bonding mold Anchor bricks can reach 1750 ~ 1800 °C. The high-temperature flexural strength of each alkaline refractory brick decreases with the increase of the test temperature, and the high-strength strength of the re-bonded mirror anchor brick with high Cr2O3 content is high. The alkaline brick added with the fused raw material has high temperature strength.

The thermal expansion rate of alkaline refractory bricks is higher than that of other products, and the thermal expansion rates of various alkaline refractory bricks with MgO as the main component have little difference. At 1600 °C, the linear expansion rate of the mirror brick is the largest, about 2.0%: the highest expansion ratio of the advanced mirror lead brick is 1.6% or so; other alkaline refractory bricks have a thermal expansion rate between the two. The thermal conductivity of alkaline refractory bricks is higher than that of high alumina bricks, clay bricks and silicon bricks. At 800 ° C, 1000 ° C, 1200 ° C, the floor tiles (MgO The thermal conductivity (W/(m·K )) of 90% to 98%) is 5.5 to 5.0, 4.5 to 4.0, and 4.0 to 3.5, respectively. When the mirror anchor brick is at the above temperature, the thermal conductivity (W/(m·) K )) are 4.5 to 3.5, 3.5 to 2.5, and 3.5 to 2.5, respectively; other alkaline refractory bricks are between the two.

The specific heat capacity of alkaline bonfire bricks is larger than that of silica bricks and clay bricks. The specific heat capacity of magnesium bricks is larger than that of other alkaline bricks. At 1000 °C, 1200 °C, 1400 °C, the specific heat capacity (kJ / (kg . K) ) of the mirror brick (MgO 97%) is 1.20, 1.22, 1.24, respectively; the specific heat capacity of the mirror anchor brick (Cr2O3 21%) is directly combined ( kJ/(kg·K )) are 1.02, 1.05, and 1.07, respectively.