Brief analysis of the performance characteristics of high al

The load-softening temperature of high-aluminum refractory bricks is an important property. The experimental results show that it changes with the content of Al2O3 in high-aluminum refractory bricks. When the Al2O3 content is lower than the theoretical composition of mullite, the equilibrium phase in high-aluminum refractory bricks is Mo Come to the stone-glass phase. The mullite content increases with the increase of Al2O3 content, and the load softening temperature also increases accordingly.

 

High-alumina refractory bricks are less resistant to thermal shock than clay bricks, and 850 ° C water-cooled cycle 3 to 5 times. Mainly due to the higher thermal expansion of corundum than mullite, but no crystal transformation. Moreover, the thermal shock resistance of I, II and II high aluminum bricks is worse than that of III high aluminum refractory bricks.

 

In production, the composition of the granulated particles is usually adopted to improve the granular structural characteristics of the high-alumina refractory bricks, thereby improving the thermal shock resistance. In recent years, a certain amount of synthetic cordierite was added to the ingredients of high-alumina refractory bricks to produce high-aluminum refractory bricks with high thermal shock resistance, and achieved remarkable results.

The slag resistance of high alumina refractory bricks also increases with the increase of Al2O3 content. Reducing the impurity content is beneficial to improve the corrosion resistance.

 

The difference between high-alumina refractory bricks and clay bricks is that high-aluminum refractory bricks have good performance and therefore have a longer service life than clay bricks, and have become one of the most widely used refractory bricks in the building materials industry.

 

Special high alumina brick is a new type of chemical combination high alumina refractory brick. It overcomes the weak thermal shock performance of high alumina refractory brick and the weak point of normal temperature compressive strength. It has the chemical corrosion resistance and high strength of phosphate refractory brick. Various advantages, and easy to hang kiln skin, is a new type of refractory brick for firing. The refractory clay used in the high-aluminum bricks is basically the same as the clay bricks, and high-strength refractory mud can also be used.