Polycrystalline fiberboard is a new - type high - temperature refractory material, mainly made of polycrystalline mullite fiber or polycrystalline alumina fiber. The polycrystalline mullite fiberboard is a rigid polycrystalline mullite fiber product obtained by mixing polycrystalline mullite fiber cotton with inorganic refractory aggregates, inorganic refractory powders, and special additives in a certain proportion and then preparing through a special process. The polycrystalline alumina fiberboard is a rigid polycrystalline alumina fiber product obtained by mixing polycrystalline alumina fiber cotton with inorganic refractory aggregates, inorganic refractory powders, and special additives in a certain proportion and then preparing through a special process.

Characteristics and Applications of Polycrystalline Fiberboard

Polycrystalline fiberboard has the following characteristics:

1.Excellent high - temperature stability: It can maintain stable physical and chemical properties in a high - temperature environment.

2.Minimal permanent linear change upon heating: It is not easy to deform at high temperatures.

3.Low slag ball content: Which improves the refractory and heat - insulating performance.

4.Excellent heat - reflection performance: It can effectively reflect heat.

5.Low heat storage and low thermal conductivity: It has a good heat - insulating effect.

6.Uniform fiber diameter: Which improves the tensile strength.

7.Strong wind - erosion resistance: It is suitable for harsh climatic conditions.

8.Good high - temperature flexibility: It can still maintain good flexibility at high temperatures.

9.Stable chemical properties: It has strong corrosion - resistance performance.

The application range of polycrystalline fiberboard is wide, including:

1.Iron and steel metallurgy industry: Used for high - temperature linings of various forging furnaces, heating furnaces, heat - treatment furnaces, etc.

2.Ceramic industry: Used for fast - firing kilns.

3.Petrochemical industry: Used for heat - insulating linings of cracking furnaces, combustion furnaces, etc.

5.High - temperature test electric furnace chambers: Can withstand high - temperature environments.

6.Sapphire furnace backings and sapphire annealing furnace linings: Provide stable high - temperature environments.

7.Various high - temperature heat - insulating seals: Ensure the sealing and heat - insulating properties of high - temperature equipment.

Technological Development of Polycrystalline Fiberboard

In recent years, the technological development of polycrystalline fiberboard has mainly focused on improving the high - temperature resistance performance of products and the batch - product quality stability. For example, by adjusting the raw material composition, the feeding sequence, and the beating time, the interweaving strength between fibers in the slurry has been improved. There is no need to perform short - cut processing pretreatment on ceramic fibers, optimizing the production process and improving production efficiency. By adding polyethylene glycol and iron sol, each material component is bonded more tightly, improving the density and strength of the product.

Advantages of Polycrystalline Fiberboard

The industrial advantages of polycrystalline fiberboard include:

1.High - temperature resistance: It can maintain stable performance in extremely high - temperature environments.

2.Low thermal conductivity: Provide a good heat - insulating effect.

3.High tensile strength: Ensure the structural stability at high temperatures.

4.Chemical stability: Resist chemical erosion.

5.Low heat storage: It can respond quickly during heating and cooling processes, improving energy utilization efficiency.

6.Good sound - insulation performance: Suitable for environments requiring sound insulation.

7.Environmental - friendly characteristics: It is non - toxic and odorless, meeting environmental protection requirements.