Clay brick is a relatively common building bricks, good quality clay brick is a certain degree of refractoriness and high temperature compression strength, high temperature has a stable performance performance characteristics. Here is a detailed introduction for you.

1, refractoriness

The refractoriness of clay bricks fluctuates between 1580-1770 ℃. General refractoriness increases with the increase of Al2O3 content, with the increase of impurity content, especially with the increase of Fe2O3 and alkali metal content is significantly reduced.

2, high temperature compressive strength

The high temperature compressive strength of clay bricks becomes larger with the increase of Al2O3 content. At the same time by the low melting point material at high temperatures appear liquid phase temperature, the number of liquid phase and viscosity. Generally above eight hundred degrees Celsius may appear plastic deformation, plastic deformation can eliminate the effect of stress in the brick body, the strength began to improve, in 1000-1200 ℃ appear high value. When the temperature exceeds one thousand two hundred degrees Celsius, the liquid phase is formed in large quantities, the viscosity decreases, and the compressive strength decreases rapidly. So even in the furnace wall single-sided heat conditions, the use of clay brick temperature is not suitable for too high.

3, load softening temperature

Load softening temperature of clay products mainly depends on the products in the Al2O3 content and the type and number of impurities. Because of the clay products in the mullite crystal number is small, in the products have not yet formed a crystalline skeleton structure, and dispersed in the glass phase, with the increase in temperature, the viscosity of the glass phase decreases, the products are gradually deformed. The load softening temperature of clay products starts at 1250-1400℃, and the temperature is 1500-1600℃ when compressed by 40%. The low load softening temperature is an important reason for the limitation of the use of clay products. The effective way to improve the load softening temperature is to increase the content of Al2O3 in the products, reduce the content of impurities, especially to strictly control the content of Fe2O3 and alkali metals. Can also be used to mix the finely ground multi-clinker ingredients and properly raise the firing temperature of the product.

4, high temperature stability

Clay products used for a long time at high temperatures will produce residual shrinkage. This is due to the production of a certain number of multiple binding agent (such as bonded clay), in the firing of mineralization is impervious to cause.

5, thermal shock stability

Clay products are good thermal shock stability, ordinary clay bricks 1,100 degrees Celsius water-cooled cycle of more than 10 times, more clinker products up to 50-100 times. Clay brick thermal shock stability is good because of mullite and the entire product of the linear expansion coefficient is small, uniform, thermal cycling process does not occur during the volume changes caused by crystalline transformation. And there are still many cracks between clinker, which can buffer the role of stress. Increase the amount of clinker and particles of reasonable grading, improve the pressure of molding, appropriate reduction of firing termination temperature, increase the number of mullite crystals and reduce the content of the glass phase can improve the thermal stability of the products.

6、Slag resistance

Clay products belong to the weak acid refractory materials, resistance to weak acidic furnace fishing erosion ability, acidic, alkaline slag resistance is poor. Improve the product density, reduce the porosity, improve the product slag resistance. Increase the content of Al2O3, resistance to alkaline slag erosion ability to improve, = resistance to acidic slag ability to enhance.