Introduction and application of alumina polycrystalline fiber board

Alumina polycrystalline fiberboard is one of the ultra-light high-temperature thermal insulation materials. It uses high-tech "sol-gel" method to make soluble aluminum and silicate into colloidal solution with a certain viscosity. It is dehydrated, dried and heat-treated at medium and high temperature. Its chemical composition is Al2o3, white in appearance, smooth, soft and elastic, especially like absorbent cotton, which integrates the characteristics of crystalline material and fiber material, the use temperature is 1450-1600.

Introduction and application of alumina polycrystalline fiber board

The alumina polycrystalline fiber sheet is low in thermal conductivity, heat shrinkage, and heat capacity. The long-term use temperature is 1300 ~ 1400C, which is higher than that of ordinary aluminum silicate fiber (1000 ~ 1100C). It has good chemical stability and can be used in acidic environment, oxidizing environment, reducing environment and vacuum condition. It has certain corrosion resistance to alkaline environment, but it is easy to be corroded by lead vapor and vanadium oxide. The fiber is mainly used in the steel industry.

The energy-saving alumina short polycrystalline fiber in the field of industrial high-temperature furnaces has outstanding high temperature resistance. It is mainly used as a thermal insulation refractory material, and is used as a protective lining in metallurgical furnaces, ceramic sintering furnaces or other high-temperature furnaces. Because of its small density, good heat insulation and small heat capacity, it can not only reduce the quality of the furnace body, but also improve the temperature control accuracy. The use of alumina fiber in high-temperature furnaces is better than ordinary refractory bricks and high-temperature coatings for energy saving, and the amount of energy saving is much greater than the amount of heat loss. The convective heat transfer from the furnace gas to the furnace wall is strengthened, so that the furnace wall can get more heat, which can be transferred to the material, and the heating speed and production capacity of the material are improved.

Applications in the field of environmental protection and recycling have bright spots

Because of its good chemical resistance, alumina polycrystalline fiber can be used in the field of environmental protection and recycling technology. The equipment for incineration of electronic waste, alumina fiber shows excellent corrosion resistance and stable structure. Alumina fiber can be used for the plug of magnesium aluminum alloy, the piston and the cylinder are well matched, which can save fuel and improve the performance of composite materials.

Aluminapolycrystalline fiberThe wettability with the metal matrix is good and the interface reaction is small, so the mechanical properties, wear resistance and hardness of the composite material are improved, and the thermal expansion coefficient is reduced. Alumina fiber reinforced composites have been applied to automotive piston groove parts and rotary gas compressors. In addition, since the alumina fiber is well bonded to the resin matrix, has greater elasticity than the glass fiber, and has higher compressive strength than the carbon fiber, the alumina resin composite material is gradually replacing the glass fiber and the carbon fiber. Especially in the sporting goods, you can make a variety of colors of high-strength fishing rod, golf, snowboard, tennis racket and so on.