Properties and performance indicators of clay bricks

 

The properties of clay products fluctuate in a wide range, which is due to the large range of chemical composition of the products (the content of AI203 fluctuates between 30 and 46%) and the differences in production processes. The fire resistance of clay products fluctuates from 1580 to 1770 ° C. It mainly depends on the chemical composition of the product and increases with the increase of the ratio of Al203 / SiO2. The increase in flux impurities, especially alkali metal oxides, will significantly reduce the fire resistance of the product. The degree of softening temperature under load mainly depends on its chemical mineral composition and density, but the latter does not affect the end temperature of load softening, but increases the starting deformation temperature.

The lower bulk density of bricks will also lower the temperature at which the load begins to soften. Therefore, in order to increase the load softening starting temperature of clay products, the following aspects should be generally considered:
 

Increase the Al203 content in the product, especially increase the Al2O3 content of the matrix; increase the firing temperature and use multiple clinker ingredients; increase the bulk density of the shaped brick.

Clay bricks have good thermal shock resistance and a large fluctuation range, generally more than 10 times (water cooling at 1100 ° C), which is not too large as the linear expansion coefficient of clay products (average linear expansion between 20 and 1300 ° C). The coefficient is 4.5X10-6-5.8 X 10-6 / ° C), and there is no polymorphic brick deformation phenomenon and it has obvious grain structure and structure.