Conclusion: The holes in the bricks are due to the addition of a combustion agent during the firing process, which produces gas at high temperatures, trapping air within the brick, thus forming the holes.

The reason is that during the production of brick blanks, high-temperature sintering is required to achieve the desired hardness and strength of the bricks. To maintain the shape of the brick blanks and prevent cracking, a certain amount of combustible agent is added. These agents burn at high temperatures, producing gases that trap air inside the bricks, creating holes.

Step:

During the brick坯 production process, a certain amount of combustion agent is added and burned during the heating process.

2. Gases produced by the combustion expand at high temperatures, trapping air and forming a hole.

The number and size of holes in the finished bricks are uncertain and depend on various factors such as the type of fuel, the amount added, and the heating temperature.

Content Extension:

Holes in bricks may also be caused by the volatilization of unburned organic matter in the brick坯. Additionally, the holes could result from uneven internal structure of the brick or uneven distribution of the burning agent. To address these issues, the process requires strict control over the amount and distribution of the burning agent to ensure the quality and stability of the brick.