In the core link of industrial production, thermal insulation refractories play an irreplaceable key role. Not only do they provide excellent thermal insulation and significantly reduce heat loss, but they also maintain the overall stability of the structure in extreme high temperatures, thus ensuring the safe operation of production equipment and promoting efficient and orderly industrial production.
Properties and principles of thermal insulation refractories
Thermal insulation refractories are known for their low thermal conductivity and low heat capacity, and their working principle is mainly based on the porous structure inside the material. These materials reduce heat transfer by reducing the thermal conductivity, while the internal pore structure also effectively insulates heat and improves thermal insulation.
When heat is transferred from the high-temperature region to the interior of the material, it undergoes two processes: solid-phase heat transfer and gas-phase heat transfer. Solid-phase heat transfer is mainly carried out through the solid structure inside the material, whereas gas-phase heat transfer is carried out through the gas in the pores. Due to the extremely low thermal conductivity of gases in the pores, gas-phase heat transfer plays an important role in thermal insulation.
Ceramic fibers: lightweight and highly effective thermal insulation
The ceramic fiber produced by Lucheng New Materials Co., Ltd. is a fibrous lightweight refractory material, which has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, low specific heat and mechanical vibration resistance. According to the composition, ceramic fibers can be divided into two categories: glass (amorphous) fibers and polycrystalline (crystalline) fibers, which are widely used in thermal insulation projects in various high-temperature environments.
The thermal conductivity of ceramic fiber is very low, only 0.03W/(m·K) at room temperature, and only 1/5 of clay brick at 1000°C. At the same time, its heat capacity is also very low, only 1/72 of refractory bricks and 1/42 of lightweight bricks. These properties make ceramic fibers an excellent thermal insulation refractory.
Working principle: The thermal insulation principle of ceramic fiber lies in its large number of microporous structures. These micropores can impede the transfer of heat, making it difficult to conduct heat inside the material. At the same time, the high melting point and good chemical stability of ceramic fibers also enable them to maintain stable properties in high-temperature environments.
Refractory bricks: a solid guardian in the heat of the day
Refractory brick is another flagship product of Lucheng New Materials Co., Ltd., which uses kaolin ore as the main raw material and is fired at high temperature, which has extremely high refractory temperature and excellent physical and chemical properties. Refractory bricks can be divided into five categories: silicon-aluminum refractory bricks, alkaline series refractory bricks, carbon-containing refractory bricks, zirconium-containing refractory bricks and heat-insulating refractory bricks.
Silica bricks and clay bricks in silicon-aluminum refractory bricks are common acid refractory bricks, which are mainly used for masonry coke ovens and vaults and other load-bearing parts of various glass and ceramic kilns. High-alumina refractory bricks are widely used in the steel industry and non-ferrous metal industry due to their excellent high temperature resistance and slag resistance.
Magnesia refractory bricks and dolomite bricks in alkaline series refractory bricks are representatives of alkaline refractory bricks, which have good resistance to alkaline slag and iron slag, and are an important part of high-temperature equipment such as open-hearth, oxygen converter and electric furnace.
Working principle: The thermal insulation principle of refractory bricks is mainly based on its high melting point and dense internal structure. The high melting point allows the refractory bricks to maintain stable performance in high-temperature environments, while the dense internal structure reduces heat transfer and improves thermal insulation. At the same time, the chemical composition and microstructure of refractory bricks also make it excellent resistance to slag and erosion.
Casables: Flexible refractory solutions
Castables are granular and powdery materials made of refractory materials with a certain amount of binder, with high fluidity, and are formed by pouring. The castable produced by Lucheng New Materials Co., Ltd. has excellent high temperature resistance, thermal shock resistance and pouring performance, and is widely used in the maintenance and new construction of furnace body, furnace bottom and other parts.
The refractory of the castable is usually above 1300°C and can maintain stable performance at high temperatures. At the same time, its high thermal shock resistance can resist thermal expansion and contraction in high-temperature equipment, and improve the service life of the equipment. In addition, the castable has good flowability, which is convenient for pouring and maintenance in complex parts.
How it works: The insulation principle of the castable is mainly based on the interaction between the aggregate, powder and binder inside it. Aggregates and powders form the main skeleton structure of the castable, and binders hold these aggregates and powders firmly together. At high temperatures, the aggregates and powders inside the castable absorb and store a large amount of heat, while the binder maintains the stability and strength of the material. This structure gives the castable excellent high temperature resistance and thermal insulation.
Innovation-driven, build the future together
As a leader in the field of thermal insulation refractories, Lucheng New Materials Co., Ltd. is constantly committed to technological innovation and product research and development. Its ceramic fibers, refractory bricks and castables have won a good reputation and wide recognition in the market with their excellent performance and wide range of applications.
In the future, Lucheng New Materials Co., Ltd. will continue to adhere to the concept of "scientific and technological innovation, quality-oriented, customer first", and continue to introduce more high-quality thermal insulation refractory materials, so as to make greater contributions to industrial production and the development of human society.