What are the properties of refractory bricks What is the refractory limit of refractory bricks?

Release time:

2021-11-12

1, chemical composition: the main components of refractory bricks determine the quality of the brick body and refractoriness characteristics.

First, what are the characteristics of refractory bricks

1, chemical composition: the main components of refractory bricks determine the quality of the brick body and refractoriness characteristics.

2, bulk density: the greater the bulk density, indicating that the refractory bricks dense, high strength, thermal conductivity may be large; Conversely, the density is small, low strength, thermal insulation effect.

3, apparent porosity: general high density refractory bricks apparent porosity in 3% -10%, ordinary dense refractory bricks in 20% -30%, lightweight refractory bricks in 45% -48%.

4, load softening temperature: is a refractory brick to withstand a constant pressure load and a certain rate of heating under the heating conditions of the deformation of the temperature, which indicates the refractory material on the high temperature and load at the same time the role of the ability to resist.

5, thermal shock resistance: refractory bricks can withstand extremely hot and cold temperature changes without being destroyed, such as clay bricks can be used for iron tanks for iron and transportation.

6, compressive strength: refractory bricks at a certain temperature (generally refers to room temperature conditions) on the unit area can withstand and not be destroyed by the ultimate load.

7, folding strength: refers to the ability of refractory bricks to withstand shear pressure, this for the refractory bricks are generally able to achieve, generally much smaller than the compressive strength.

8, re-firing line rate of change: refractory bricks in the heating to the specified temperature and hold a certain time, cooling to room temperature after the length of the brick body produced by the residual contraction or expansion, + sign indicates expansion, - sign indicates contraction. The rate of change of the line is an indication of the volumetric stability of the refractory brick at high temperatures, if the shrinkage is too great, it will lead to the dislodgement of the refractory brick, etc..

The characteristics of refractory bricks are directly related to the composition content of the raw materials of refractory bricks, and the characteristics of refractory bricks differ according to the composition content of the raw materials of refractory bricks. Refractory bricks are used in different environments, requiring different characteristics of refractory bricks.

Second, how much is the refractory limit of refractory bricks?

Refractory bricks according to the material and content can be more than 1,000 degrees to more than two thousand degrees in the long-term use of high temperature, fire-resistant limit is the building components according to the standard curve of time and temperature fire-resistance test, used for fire prevention and fire separation. Fire-resistant limit is the time according to the time temperature standard curve of building components for fire-resistance test, from the fire affected to the loss of support capacity or integrity is damaged or fire time. Isolation loss, expressed in hours.

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