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Can the temperature of the refractory brick exceed the fire resistance temperature?

Date:2019-11-07 11:25 | From:Zhengzhou Sunrise Refractory | Author:admin
What is the load softening temperature? The temperature at which the refractory bricks are subjected to a constant compressive load (tested at 0.2 MPA) and heated at a certain heating rate. The load softening temperature indicates the ability of the refractory to resist both high temperature and load. The load softening temperature of the first grade high alumina brick is above 1550 degrees, which is the result of the test. 
 
However, in use, it is often impossible to exceed this temperature too much, for the reasons described above. It can be used for a long time at around 1500 degrees, and the wear of refractory bricks will be much reduced. 
 
Generally, the load softening temperature of the refractory brick is related to the density and the porosity, and the high-density and low porosity refractory material starts to have a high deformation temperature. The higher the chemical composition of the refractory brick, the higher the load softening temperature and the higher the use temperature.
 
How to increase the load softening temperature of refractory bricks?
 
First of all, it is necessary to improve the purity of the refractory brick raw materials. The higher the purity, the less the impurity content, the lower the content of the low-melt and the softening temperature of the load.
The second is to add a certain matrix to the ingredients. The increase in the content of the main crystal phase during use (such as the addition of mullite powder to high alumina refractory bricks) also increases the load softening temperature.
 
Third, the use of reasonable granular ingredients, increase the molding pressure of the brick, reduce the porosity and increase the bulk density of the refractory brick.
 
The fourth is to improve the firing temperature of the refractory brick slab at high temperature, prolong the holding time, and fully react the chemical composition of the refractory brick.
 
The above content is edited and edited by Tianyang Refractory. The manufacturer reminds that the use temperature of refractory bricks cannot exceed the refractory temperature and cannot exceed the load softening temperature. These are the basic conditions for prolonging the service life of high temperature kiln.

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