Why do refractory bricks deform

refractory brick is a common refractory material with good high temperature resistance. However, refractory bricks may deform to some extent during use. The following are several common reasons for the deformation of refractory bricks:

一. Causes of refractory brick deformation

1. Thermal expansion: Refractory bricks will expand thermally when heated, which is caused by the thermal movement of the internal structure of the brick body at high temperature. Refractory bricks with different compositions and structures have different coefficients of thermal expansion. When the heating temperature rises, the brick body will expand linearly or volumetrically, resulting in deformation.

2. Thermal stress: At high temperature, the surface and interior of refractory bricks will be affected by thermal stress caused by thermal expansion. When the temperature changes greatly or changes quickly, different parts of the brick body are heated to different degrees, resulting in thermal expansion mismatch in local areas, resulting in internal stress, which causes deformation.

3. Thermal shock: Thermal shock refers to the stress and deformation phenomenon that occurs when refractory bricks are subjected to sudden cooling or rapid temperature changes under high temperature conditions. Thermal shock can cause cracks, spalling or general deformation of refractory bricks.

4. Mechanical stress: In addition to the stress caused by temperature, refractory bricks may also be affected by mechanical stress. For example, external pressure, vibration, impact, etc. can have a mechanical impact on refractory bricks and cause deformation.

5. Wrong installation or use: Incorrect installation methods, improper material selection, poor construction quality and other factors may also cause the deformation of refractory bricks. For example, inappropriate mortar ratio during masonry, improper joint treatment between bricks, etc., may affect the structural stability of bricks and cause deformation.

二. Measures to prevent the deformation of refractory bricks

In order to prevent the deformation of refractory bricks, the following measures can be taken:

1. Select high-quality refractory brick materials that meet the requirements.

2. Consider the influence of thermal expansion coefficient and thermal stress during the design and installation process, and make corresponding compensation measures.

3. Control the speed of temperature change to avoid excessive cooling or heating.

4. Avoid the impact of mechanical stress on refractory bricks.

5. Carry out construction in strict accordance with installation specifications and standards to ensure the quality of masonry.

6. Regularly check the status of refractory bricks, and repair or replace damaged parts in time.

Deformation of refractory bricks in high temperature environment is a complex problem with many influencing factors. Therefore, in special application scenarios, it is recommended to consult professional refractory suppliers or engineers to obtain solutions and suggestions for specific situations.